feat: json2go (#130)

* feat(json2go): implement

* feat(json2go): support manual input

* chore(readme): add json2go

* chore(docs): add docs

.editorconfig

@@ -0,0 +1,16 @@
+root = true
+
+[*]
+indent_style = space
+indent_size = 4
+end_of_line = lf
+insert_final_newline = true
+trim_trailing_whitespace = true
+charset = utf-8
+
+[*.{md,yml,yaml,toml,lua,vim}]
+indent_size = 2
+
+[*.go]
+indent_style = tab
+indent_size = 4

.envrc

@@ -0,0 +1,4 @@
+dotenv
+
+# GOPHER_DIR - needed only for tests, to find the root of the project
+env_vars_required GOPHER_DIR

.github/workflows/ci.yml

@@ -1,23 +0,0 @@
-name: Format and lint
-on: [push, pull_request]
-
-jobs:
-  format:
-    name: stylua
-    runs-on: ubuntu-latest
-    steps:
-      - uses: actions/checkout@v2
-      - uses: JohnnyMorganz/stylua-action@1.0.0
-        with:
-          token: ${{ secrets.GITHUB_TOKEN }}
-          args: --check .
-
-  lint:
-    name: selene
-    runs-on: ubuntu-latest
-    steps:
-      - uses: actions/checkout@v2
-      - uses: NTBBloodbath/selene-action@v1.0.0
-        with:
-          token: ${{ secrets.GITHUB_TOKEN }}
-          args: --display-style=quiet .

.github/workflows/linters.yml

@@ -0,0 +1,58 @@
+name: linters
+
+on:
+  push:
+    branches:
+    - main
+    - develop
+  pull_request:
+
+jobs:
+  linters:
+    name: Lua
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: JohnnyMorganz/stylua-action@v3
+        with:
+          token: ${{ secrets.GITHUB_TOKEN }}
+          version: latest
+          args: --check .
+
+      - uses: NTBBloodbath/selene-action@v1.0.0
+        with:
+          token: ${{ secrets.GITHUB_TOKEN }}
+          args: .
+
+  docs:
+    name: Docs
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Install Task
+        uses: arduino/setup-task@v1
+        with:
+          version: 3.x
+          repo-token: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Install NeoVim
+        uses: rhysd/action-setup-vim@v1
+        with:
+          neovim: true
+          version: stable
+
+      - name: Cache .tests
+        uses: actions/cache@v4
+        with:
+          path: |
+            ${{ github.workspace }}/.tests
+          key: ${{ runner.os }}-tests-${{ hashFiles('${{ github.workspace }}/.tests') }}
+
+      - name: Generate docs
+        run: task docgen
+
+      - name: Diff
+        run: |
+          git diff doc
+          exit $(git status --porcelain doc | wc -l | tr -d " ")

.github/workflows/tests.yml

@@ -0,0 +1,62 @@
+name: tests
+
+on:
+  push:
+    branches:
+    - main
+    - develop
+  pull_request:
+
+jobs:
+  tests:
+    strategy:
+      matrix:
+        os: [ubuntu-latest]
+        version:
+          - stable
+          - nightly
+          - v0.10.0
+          - v0.10.4
+          - v0.11.0
+          - v0.11.1
+          - v0.11.2
+          - v0.11.3
+          - v0.11.4
+    runs-on: ${{ matrix.os }}
+    steps:
+      - name: Install Task
+        uses: arduino/setup-task@v1
+        with:
+          version: 3.x
+          repo-token: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Install Go
+        uses: actions/setup-go@v5
+        with:
+          go-version: "1.24.0"
+          check-latest: false
+
+      - name: Install NeoVim
+        uses: rhysd/action-setup-vim@v1
+        with:
+          neovim: true
+          version: ${{ matrix.version }}
+
+      - uses: actions/checkout@v4
+
+      - name: Cache .tests
+        uses: actions/cache@v4
+        with:
+          path: |
+            ${{ github.workspace }}/.tests
+            ~/.cache/go-build
+            ~/go/pkg/mod
+          key: ${{ runner.os }}-tests-${{ hashFiles('${{ github.workspace }}/.tests') }}
+
+      - name: Install Go bins
+        run: task install-deps
+
+      - name: Run Tests
+        run: |
+          nvim --version
+          task test

.gitignore

@@ -1 +1,3 @@
-playground/
+/playground/
+/.tests/
+/.env

.pre-commit-config.yaml

@@ -1,15 +0,0 @@
-repos:
-- repo: local
-  hooks:
-  - id: stylua
-    name: StyLua
-    language: rust
-    entry: stylua
-    types: [lua]
-    args: ["--check", "-"]
-  - id: selene
-    name: Selene
-    language: rust
-    entry: selene
-    types: [lua]
-    args: ["-"]

CONTRIBUTING.md

@@ -0,0 +1,49 @@
+# Contributing to `gopher.nvim`
+Thank you for taking the time to submit some code to gopher.nvim. It means a lot!
+
+### Task running
+In this codebase for running tasks is used [Taskfile](https://taskfile.dev).
+You can install it with:
+```bash
+go install github.com/go-task/task/v3/cmd/task@latest
+```
+
+### Formatting and linting
+Code is formatted by [stylua](https://github.com/JohnnyMorganz/StyLua) and linted using [selene](https://github.com/Kampfkarren/selene).
+You can install these with:
+
+```bash
+sudo pacman -S selene stylua
+# or whatever is your package manager
+```
+
+For formatting use this following commands, or setup your editor to integrate with selene/stylua:
+```bash
+task format
+task lint
+```
+
+### Documentation
+Here we're using [mini.doc](https://github.com/echasnovski/mini.nvim/blob/main/readmes/mini-doc.md)
+for generating vimhelp files based on [LuaCats](https://luals.github.io/wiki/annotations/) annotations in comments.
+
+For demo gifs in [readme](./README.md) we're using [vhs](https://github.com/charmbracelet/vhs).
+All files related to demos live in [/vhs](./vhs) dir.
+
+You can generate docs with:
+```bash
+task docgen       # generates vimhelp
+task vhs:generate # generates demo gifs
+```
+
+### Commit messages
+We use [Conventional Commits](https://www.conventionalcommits.org/en/v1.0.0/), please follow it.
+
+### Testing
+For testing this plugins uses [mini.test](https://github.com/echasnovski/mini.nvim/blob/main/readmes/mini-test.md).
+All tests live in [/spec](./spec) dir.
+
+You can run tests with:
+```bash
+task test
+```

LICENSE

@@ -0,0 +1,21 @@
+MIT License
+
+Copyright (c) 2025 Oleksandr Smirnov
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

Makefile

@@ -1,11 +0,0 @@
-.PHONY:
-.SILENT:
-
-format:
-	stylua **/*.lua
-
-lint:
-	selene **/*.lua
-
-test:
-	nvim --headless -u ./spec/minimal.vim  -c "PlenaryBustedDirectory spec {minimal_init='./spec/minimal.vim'}"

README.md

@@ -1,81 +1,296 @@
 # gopher.nvim
 
+[![Stand With Ukraine](https://raw.githubusercontent.com/vshymanskyy/StandWithUkraine/main/banner-direct-single.svg)](https://stand-with-ukraine.pp.ua)
+
 Minimalistic plugin for Go development in Neovim written in Lua.
 
-It's not an LSP tool, the main goal of this plugin add go tooling support in neovim.
+It's **NOT** an LSP tool, the goal of this plugin is to add go tooling support in Neovim.
 
-## Install
+> All development of new and maybe undocumented, and unstable features is happening on [develop](https://github.com/olexsmir/gopher.nvim/tree/develop) branch.
 
-Pre-dependency: [go](https://github.com/golang/go) (tested on 1.17 and 1.18)
+## Table of content
+* [How to install](#install-using-lazynvim)
+* [Features](#features)
+* [Configuration](#configuration)
+* [Troubleshooting](#troubleshooting)
+* [Contributing](#contributing)
+
+## Install (using [lazy.nvim](https://github.com/folke/lazy.nvim))
+
+Requirements:
+
+- **Neovim 0.10** or later
+- Treesitter parser for `go`(`:TSInstall go` if you use [nvim-treesitter](https://github.com/nvim-treesitter/nvim-treesitter))
+- [Go](https://github.com/golang/go) installed
+
+> [!IMPORTANT]
+> If you prefer using other forges, this repository is also mirrored at:
+> - [tangled.org](https://tangled.org): [`https://tangled.org/olexsmir.xyz/gopher.nvim`](https://tangled.org/olexsmir.xyz/gopher.nvim)
+> - [codeberg.org](https://codeberg.org): [`https://codeberg.org/olexsmir/gopher.nvim`](https://codeberg.org/olexsmir/gopher.nvim)
 
 ```lua
-use {
+-- NOTE: this plugin is already lazy-loaded and adds only about 1ms
+-- of load time to your config
+{
   "olexsmir/gopher.nvim",
-  requires = { -- dependencies
-    "nvim-lua/plenary.nvim",
-    "nvim-treesitter/nvim-treesitter",
-  },
+  ft = "go",
+  -- branch = "develop"
+  -- (optional) updates the plugin's dependencies on each update
+  build = function()
+    vim.cmd.GoInstallDeps()
+  end,
+  ---@module "gopher"
+  ---@type gopher.Config
+  opts = {},
 }
 ```
 
-Also, run `TSInstall go` if install the `go` parser if not installed yet.
-
 ## Features
 
-1. Install requires go tools:
+<details>
+  <summary>
+    <b>Install plugin's go deps</b>
+  </summary>
 
   ```vim
   :GoInstallDeps
   ```
 
-This will install next tools:
+  This will install the following tools:
 
   - [gomodifytags](https://github.com/fatih/gomodifytags)
   - [impl](https://github.com/josharian/impl)
+  - [gotests](https://github.com/cweill/gotests)
+  - [iferr](https://github.com/koron/iferr)
+  - [json2go](https://github.com/olexsmir/json2go)
+</details>
 
-2. Modify struct tags:
-By default be added/removed `json` tag, if not set.
+<details>
+  <summary>
+    <b>Add and remove tags for structs via <a href="https://github.com/fatih/gomodifytags">gomodifytags</a></b>
+  </summary>
+
+  ![Add tags demo](./vhs/tags.gif)
+
+  By default `json` tag will be added/removed, if not set:
 
   ```vim
-:GoTagAdd json " For add json tag
-:GoTagRm yaml " For remove yaml tag
+  " add json tag
+  :GoTagAdd json
+
+  " add json tag with omitempty option
+  :GoTagAdd json=omitempty
+
+  " remove yaml tag
+  :GoTagRm yaml
   ```
 
-3. Run `go mod` command
+  ```lua
+  -- or you can use lua api
+  require("gopher").tags.add "xml"
+  require("gopher").tags.rm "proto"
+  ```
+</details>
+
+<details>
+  <summary>
+    <b>Generating tests via <a href="https://github.com/cweill/gotests">gotests</a></b>
+  </summary>
 
   ```vim
-:GoMod tidy " Runs `go mod tidy`
-:GoMod init asdf " Runs `go mod init asdf`
+  " Generate one test for a specific function/method(one under cursor)
+  :GoTestAdd
+
+  " Generate all tests for all functions/methods in the current file
+  :GoTestsAll
+
+  " Generate tests for only  exported functions/methods in the current file
+  :GoTestsExp
   ```
 
-4. Run `go get` command
+  ```lua
+  -- or you can use lua api
+  require("gopher").test.add()
+  require("gopher").test.exported()
+  require("gopher").test.all()
+  ```
 
-Link can has a `http` or `https` prefix.
+  For named tests see `:h gopher.nvim-gotests-named`
+</details>
 
-You can provide more that one package url.
+<details>
+  <summary>
+    <b>Run commands like <code>go mod/get/etc</code> inside of nvim</b>
+  </summary>
 
   ```vim
   :GoGet github.com/gorilla/mux
+
+  " Link can have an `http` or `https` prefix.
+  :GoGet https://github.com/lib/pq
+
+  " You can provide more than one package url
+  :GoGet github.com/jackc/pgx/v5 github.com/google/uuid/
+
+  " go mod commands
+  :GoMod tidy
+  :GoMod init new-shiny-project
+
+  " go work commands
+  :GoWork sync
+
+  " run go generate in cwd
+  :GoGenerate
+
+  " run go generate for the current file
+  :GoGenerate %
   ```
+</details>
 
-5. Interface implementation
+<details>
+  <summary>
+    <b>Interface implementation via <a href="https://github.com/josharian/impl">impl<a></b>
+  </summary>
 
-Command syntax:
+  ![Auto interface implementation demo](./vhs/impl.gif)
+
+  Syntax of the command:
   ```vim
   :GoImpl [receiver] [interface]
 
-" Also you can put cursor on the struct and run:
+  " also you can put a cursor on the struct and run
   :GoImpl [interface]
   ```
 
-Example of usage:
+  Usage examples:
   ```vim
-" Example
   :GoImpl r Read io.Reader
-" or simply put your cursor in the struct and run:
+  :GoImpl Write io.Writer
+
+  " or you can simply put a cursor on the struct and run
   :GoImpl io.Reader
   ```
+</details>
 
-## Thanks
+<details>
+  <summary>
+    <b>Generate boilerplate for doc comments</b>
+  </summary>
 
-- [go.nvim](https://github.com/ray-x/go.nvim)
+  ![Generate comments](./vhs/comment.gif)
+
+  First set a cursor on **public** package/function/interface/struct and execute:
+
+  ```vim
+  :GoCmt
+  ```
+</details>
+
+<details>
+  <summary>
+    <b>Convert json to Go types</b>
+  </summary>
+
+  ![Convert JSON to Go types](./vhs/json2go.gif)
+
+  `:GoJson` opens a temporary buffer where you can paste or write JSON.
+  Saving the buffer (`:w` or `:wq`) automatically closes it and inserts the generated Go struct into the original buffer at the cursor position.
+
+  Alternatively, you can pass JSON directly as an argument:
+  ```vim
+  :GoJson {"name": "Alice", "age": 30}
+  ```
+
+  Additionally, `gopher.json2go` provides lua api, see `:h gopher.nvim-json2go` for details.
+</details>
+
+
+<details>
+  <summary>
+    <b>Generate <code>if err != nil {</code> via <a href="https://github.com/koron/iferr">iferr</a></b>
+  </summary>
+
+  ![Generate if err != nil {](./vhs/iferr.gif)
+
+  Set the cursor on the line with `err` and execute
+
+  ```vim
+  :GoIfErr
+  ```
+</details>
+
+## Configuration
+
+> [!IMPORTANT]
+>
+> If you need more info look `:h gopher.nvim`
+
+**Take a look at default options (might be a bit outdated, look `:h gopher.nvim-config`)**
+
+```lua
+require("gopher").setup {
+  -- log level, you might consider using DEBUG or TRACE for debugging the plugin
+  log_level = vim.log.levels.INFO,
+
+  -- timeout for running internal commands
+  timeout = 2000,
+
+  -- timeout for running installer commands(e.g :GoDepsInstall, :GoDepsInstallSync)
+  installer_timeout = 999999,
+
+  -- user specified paths to binaries
+  commands = {
+    go = "go",
+    gomodifytags = "gomodifytags",
+    gotests = "gotests",
+    impl = "impl",
+    iferr = "iferr",
+  },
+  gotests = {
+    -- a default template that gotess will use.
+    -- gotets doesn't have template named `default`, we use it to represent absence of the provided template.
+    template = "default",
+
+    -- path to a directory containing custom test code templates
+    template_dir = nil,
+
+    -- use named tests(map with test name as key) in table tests(slice of structs by default)
+    named = false,
+  },
+  gotag = {
+    transform = "snakecase",
+
+    -- default tags to add to struct fields
+    default_tag = "json",
+
+    -- default tag option added struct fields, set to nil to disable
+    -- e.g: `option = "json=omitempty,xml=omitempty`
+    option = nil,
+  },
+  iferr = {
+    -- choose a custom error message, nil to use default
+    -- e.g: `message = 'fmt.Errorf("failed to %w", err)'`
+    message = nil,
+  },
+  json2go = {
+    -- command used to open interactive input.
+    -- e.g: `split`, `botright split`, `tabnew`
+    interactive_cmd = "vsplit",
+
+    -- name of autogenerated struct
+    -- e.g: "MySuperCoolName"
+    type_name = nil,
+  },
+}
+```
+
+## Troubleshooting
+The most common issue with the plugin is missing dependencies.
+Run `:checkhealth gopher` to verify that the plugin is installed correctly.
+If any binaries are missing, install them using `:GoInstallDeps`.
+
+If the issue persists, feel free to [open a new issue](https://github.com/olexsmir/gopher.nvim/issues/new).
+
+## Contributing
+
+PRs are always welcome. See [CONTRIBUTING.md](./CONTRIBUTING.md)

Taskfile.yml

@@ -0,0 +1,42 @@
+version: "3"
+
+includes:
+  vhs:
+    taskfile: ./vhs/Taskfile.yml
+    dir: ./vhs
+
+tasks:
+  lint:
+    cmds:
+      - selene .
+      - stylua --check .
+
+  format:
+    cmd: stylua .
+
+  test:
+    cmds:
+      - |
+        nvim --clean --headless \
+             -u ./scripts/minimal_init.lua \
+             -c "lua MiniTest.run()" \
+             -c ":qa!"
+  nvim:
+    cmd: nvim --clean -u "./scripts/minimal_init.lua" {{ .CLI_ARGS }}
+
+  docgen:
+    desc: generate vimhelp
+    cmds:
+      - |
+        nvim --clean --headless \
+             -u "./scripts/minimal_init.lua" \
+             -c "luafile ./scripts/docgen.lua" \
+             -c ":qa!"
+
+  install-deps:
+    desc: installs go bin (used in CI)
+    cmds:
+      - |
+        nvim --clean --headless \
+             -u "./scripts/minimal_init.lua" \
+             +GoInstallDepsSync +qa

autoload/health/gopher.vim

@@ -1,3 +0,0 @@
-function! health#gopher#check()
-  lua require"gopher.health".check()
-endfunction

doc/.gitignore

@@ -0,0 +1 @@
+/tags

doc/gopher.nvim.txt

@@ -0,0 +1,294 @@
+*gopher.nvim* Enhance your golang experience
+
+MIT License Copyright (c) 2025 Oleksandr Smirnov
+
+==============================================================================
+
+gopher.nvim is a minimalistic plugin for Go development in Neovim written in Lua.
+It's not an LSP tool, the main goal of this plugin is add go tooling support in Neovim.
+
+Table of Contents
+  Setup ................................................ |gopher.nvim-setup()|
+  Install dependencies ............................ |gopher.nvim-dependencies|
+  Config ................................................ |gopher.nvim-config|
+  Commands ............................................ |gopher.nvim-commands|
+  Modify struct tags ............................... |gopher.nvim-struct-tags|
+  json2go .............................................. |gopher.nvim-json2go|
+  Auto implementation of interface methods ................ |gopher.nvim-impl|
+  Generating unit tests boilerplate .................... |gopher.nvim-gotests|
+  Iferr .................................................. |gopher.nvim-iferr|
+  Generate comments ................................... |gopher.nvim-comments|
+
+------------------------------------------------------------------------------
+                                                           *gopher.nvim-setup()*
+                         `gopher.setup`({user_config})
+Setup function. This method simply merges default config with opts table.
+You can read more about configuration at |gopher.nvim-config|
+Calling this function is optional, if you ok with default settings.
+See |gopher.nvim.config|
+
+Usage ~
+>lua
+ require("gopher").setup {} -- use default config or replace {} with your own
+<
+Parameters ~
+{user_config} `(gopher.Config)` See |gopher.nvim-config|
+
+------------------------------------------------------------------------------
+                                                      *gopher.nvim-dependencies*
+                             `gopher.install_deps`
+
+Gopher.nvim implements most of its features using third-party tools. To
+install plugin's dependencies, you can run:
+`:GoInstallDeps` or `:GoInstallDepsSync`
+or use `require("gopher").install_deps()` if you prefer lua api.
+
+
+==============================================================================
+------------------------------------------------------------------------------
+                                                            *gopher.nvim-config*
+                                `default_config`
+>lua
+  local default_config = {
+    -- log level, you might consider using DEBUG or TRACE for debugging the plugin
+    ---@type number
+    log_level = vim.log.levels.INFO,
+
+    -- timeout for running internal commands
+    ---@type number
+    timeout = 2000,
+
+    -- timeout for running installer commands(e.g :GoDepsInstall, :GoDepsInstallSync)
+    ---@type number
+    installer_timeout = 999999,
+
+    -- user specified paths to binaries
+    ---@class gopher.ConfigCommand
+    commands = {
+      go = "go",
+      gomodifytags = "gomodifytags",
+      gotests = "gotests",
+      impl = "impl",
+      iferr = "iferr",
+      json2go = "json2go",
+    },
+    ---@class gopher.ConfigGotests
+    gotests = {
+      -- a default template that gotess will use.
+      -- gotets doesn't have template named `default`, we use it to represent absence of the provided template.
+      template = "default",
+
+      -- path to a directory containing custom test code templates
+      ---@type string|nil
+      template_dir = nil,
+
+      -- use named tests(map with test name as key) in table tests(slice of structs by default)
+      named = false,
+    },
+    ---@class gopher.ConfigGoTag
+    gotag = {
+      ---@type gopher.ConfigGoTagTransform
+      transform = "snakecase",
+
+      -- default tags to add to struct fields
+      default_tag = "json",
+
+      -- default tag option added struct fields, set to nil to disable
+      -- e.g: `option = "json=omitempty,xml=omitempty`
+      ---@type string|nil
+      option = nil,
+    },
+    ---@class gopher.ConfigIfErr
+    iferr = {
+      -- choose a custom error message, nil to use default
+      -- e.g: `message = 'fmt.Errorf("failed to %w", err)'`
+      ---@type string|nil
+      message = nil,
+    },
+    ---@class gopher.ConfigJson2Go
+    json2go = {
+      -- command used to open interactive input.
+      -- e.g: `split`, `botright split`, `tabnew`
+      interactive_cmd = "vsplit",
+
+      -- name of autogenerated struct, if nil none, will the default one of json2go.
+      -- e.g: "MySuperCoolName"
+      ---@type string|nil
+      type_name = nil,
+    },
+  }
+<
+Class ~
+{gopher.Config}
+Fields ~
+{setup} `(fun(user_config?: gopher.Config))`
+
+
+==============================================================================
+------------------------------------------------------------------------------
+                                                          *gopher.nvim-commands*
+
+If don't want to automatically register plugins' commands,
+you can set `vim.g.gopher_register_commands` to `false`, before loading the plugin.
+
+
+==============================================================================
+------------------------------------------------------------------------------
+                                                       *gopher.nvim-struct-tags*
+
+`struct_tags` is utilizing the `gomodifytags` tool to add or remove tags to
+struct fields.
+
+Usage ~
+
+How to add/remove/clear tags to struct fields:
+1. Place cursor on the struct
+2. Run `:GoTagAdd json` to add json tags to struct fields
+3. Run `:GoTagRm json` to remove json tags to struct fields
+4. Run `:GoTagClear` to clear all tags from struct fields
+
+If you want to add/remove tag with options, you can use `json=omitempty`
+(where json is tag, and omitempty is its option).
+Example: `:GoTagAdd xml json=omitempty`
+
+
+NOTE: if you dont specify the tag it will use `json` as default
+
+Example:
+>go
+   // before
+   type User struct {
+   // ^ put your cursor here
+   // run `:GoTagAdd yaml`
+       ID int
+       Name string
+   }
+
+   // after
+   type User struct {
+       ID int      `yaml:id`
+       Name string `yaml:name`
+   }
+<
+
+==============================================================================
+------------------------------------------------------------------------------
+                                                           *gopher.nvim-json2go*
+
+Convert json to go type annotations.
+
+Usage ~
+
+`:GoJson` opens a temporary buffer where you can paste or write JSON.
+Saving the buffer (`:w` or `:wq`) automatically closes it and inserts the
+generated Go struct into the original buffer at the cursor position.
+
+Alternatively, you can pass JSON directly as an argument:
+>vim
+   :GoJson {"name": "Alice", "age": 30}
+<
+------------------------------------------------------------------------------
+                                                           *json2go.transform()*
+                        `json2go.transform`({json_str})
+
+Parameters ~
+{json_str} `(string)` Json string that is going to be converted to go type.
+Return ~
+`(string)` `(optional)` Go type, or nil if failed.
+
+------------------------------------------------------------------------------
+                                                             *json2go.json2go()*
+                         `json2go.json2go`({json_str})
+Converts json string to go type, and puts result under the cursor. If
+[json_str] is nil, will open an interactive prompt (with cmd set in
+config).
+
+Parameters ~
+{json_str} `(optional)` `(string)`
+
+
+==============================================================================
+------------------------------------------------------------------------------
+                                                              *gopher.nvim-impl*
+
+Integration of `impl` tool to generate method stubs for interfaces.
+
+Usage ~
+
+1. Automatically implement an interface for a struct:
+ - Place your cursor on the struct where you want to implement the interface.
+ - Run `:GoImpl io.Reader`
+ - This will automatically determine the receiver and implement the `io.Reader` interface.
+
+2. Specify a custom receiver:
+ - Place your cursor on the struct
+ - Run `:GoImpl w io.Writer`, where:
+  - `w` is the receiver.
+  - `io.Writer` is the interface to implement.
+
+3. Explicitly specify the receiver, struct, and interface:
+ - No need to place the cursor on the struct if all arguments are provided.
+ - Run `:GoImpl r RequestReader io.Reader`, where:
+  - `r` is the receiver.
+  - `RequestReader` is the struct.
+  - `io.Reader` is the interface to implement.
+
+Example:
+>go
+   type BytesReader struct{}
+   //    ^ put your cursor here
+   // run `:GoImpl b io.Reader`
+
+   // this is what you will get
+   func (b *BytesReader) Read(p []byte) (n int, err error) {
+       panic("not implemented") // TODO: Implement
+   }
+<
+
+==============================================================================
+------------------------------------------------------------------------------
+                                                           *gopher.nvim-gotests*
+gotests is utilizing the `gotests` tool to generate unit tests boilerplate.
+Usage ~
+
+- Generate unit test for specific function/method:
+ 1. Place your cursor on the desired function/method.
+ 2. Run `:GoTestAdd`
+
+- Generate unit tests for *all* functions/methods in current file:
+ - run `:GoTestsAll`
+
+- Generate unit tests *only* for *exported(public)* functions/methods:
+ - run `:GoTestsExp`
+
+You can also specify the template to use for generating the tests.
+See |gopher.nvim-config|.
+More details about templates: https://github.com/cweill/gotests
+
+If you prefer named tests, you can enable them in |gopher.nvim-config|.
+
+
+==============================================================================
+------------------------------------------------------------------------------
+                                                             *gopher.nvim-iferr*
+
+`iferr` provides a way to way to automatically insert `if err != nil` check.
+If you want to change `-message` option of `iferr` tool, see |gopher.nvim-config|
+
+Usage ~
+Execute `:GoIfErr` near any `err` variable to insert the check
+
+
+==============================================================================
+------------------------------------------------------------------------------
+                                                          *gopher.nvim-comments*
+
+This module provides a way to generate comments for Go code.
+
+Usage ~
+
+Set cursor on line with function/method/struct/etc and
+run `:GoCmt` to generate a comment.
+
+
+ vim:tw=78:ts=8:noet:ft=help:norl:

lua/gopher/_utils/init.lua

@@ -1,39 +1,72 @@
-return {
-  ---@param t table
-  ---@return boolean
-  empty = function(t)
-    if t == nil then
-      return true
+local c = require "gopher.config"
+local log = require "gopher._utils.log"
+local utils = {}
+
+---@param msg string
+---@param lvl? integer by default `vim.log.levels.INFO`
+function utils.notify(msg, lvl)
+  lvl = lvl or vim.log.levels.INFO
+  vim.notify(msg, lvl, {
+    ---@diagnostic disable-next-line:undefined-field
+    title = c.___plugin_name,
+  })
+  log.debug(msg)
 end
 
-    return next(t) == nil
-  end,
+---@param path string
+---@return string
+function utils.readfile_joined(path)
+  return table.concat(vim.fn.readfile(path), "\n")
+end
+
+---@param t string[]
+---@return string[]
+function utils.remove_empty_lines(t)
+  local res = {}
+  for _, line in ipairs(t) do
+    if line ~= "" then
+      table.insert(res, line)
+    end
+  end
+  return res
+end
 
 ---@param s string
 ---@return string
-  rtrim = function(s)
-    local n = #s
-    while n > 0 and s:find("^%s", n) do
-      n = n - 1
+function utils.trimend(s)
+  local r, _ = string.gsub(s, "%s+$", "")
+  return r
 end
 
-    return s:sub(1, n)
-  end,
-
-  ---@param lib string
-  ---@return boolean
-  lualib_is_found = function(lib)
-    local is_found, _ = pcall(require, lib)
-    return is_found
-  end,
-
-  ---@param bin string
-  ---@return boolean
-  binary_is_found = function(bin)
-    if vim.fn.executable(bin) == 1 then
-      return true
+-- Since indentation can be spaces or tabs, that's my hack around it
+---@param line string
+---@param indent integer
+---@return string
+function utils.indent(line, indent)
+  local char = string.sub(line, 1, 1)
+  if char ~= " " and char ~= "\t" then
+    char = " "
+  end
+  return string.rep(char, indent)
 end
 
-    return false
-  end,
-}
+---@generic T
+---@param tbl T[]
+---@return T[]
+function utils.list_unique(tbl)
+  if vim.fn.has "nvim-0.12" == 1 then
+    return vim.list.unique(tbl)
+  end
+
+  for i = #tbl, 1, -1 do
+    for j = 1, i - 1 do
+      if tbl[i] == tbl[j] then
+        table.remove(tbl, i)
+        break
+      end
+    end
+  end
+  return tbl
+end
+
+return utils

lua/gopher/_utils/log.lua

@@ -0,0 +1,171 @@
+-- thanks https://github.com/tjdevries/vlog.nvim
+-- and https://github.com/williamboman/mason.nvim
+-- for the code i have stolen(or have inspected by idk)
+local c = require "gopher.config"
+
+---@class gopher.Logger
+---@field get_outfile fun():string
+---@field trace fun(...)
+---@field fmt_trace fun(...)
+---@field debug fun(...)
+---@field fmt_debug fun(...)
+---@field info fun(...)
+---@field fmt_info fun(...)
+---@field warn fun(...)
+---@field fmt_warn fun(...)
+---@field error fun(...)
+---@field fmt_error fun(...)
+
+local config = {
+  -- Name of the plugin. Prepended to log messages
+  ---@diagnostic disable-next-line:undefined-field
+  name = c.___plugin_name,
+
+  -- Should print the output to neovim while running
+  -- values: 'sync','async',false
+  use_console = vim.env.GOPHER_VERBOSE_LOGS == "1",
+
+  -- Should highlighting be used in console (using echohl)
+  highlights = true,
+
+  -- Should write to a file
+  use_file = true,
+
+  -- Level configuration
+  modes = {
+    { name = "trace", hl = "Comment", level = vim.log.levels.TRACE },
+    { name = "debug", hl = "Comment", level = vim.log.levels.DEBUG },
+    { name = "info", hl = "None", level = vim.log.levels.INFO },
+    { name = "warn", hl = "WarningMsg", level = vim.log.levels.WARN },
+    { name = "error", hl = "ErrorMsg", level = vim.log.levels.ERROR },
+  },
+
+  -- Can limit the number of decimals displayed for floats
+  float_precision = 0.01,
+}
+
+---@type gopher.Logger
+---@diagnostic disable-next-line: missing-fields
+local log = {}
+
+---@return string
+function log.get_outfile()
+  return table.concat {
+    (vim.fn.has "nvim-0.8.0" == 1) and vim.fn.stdpath "log" or vim.fn.stdpath "cache",
+    ("/%s.log"):format(config.name),
+  }
+end
+
+-- selene: allow(incorrect_standard_library_use)
+local unpack = unpack or table.unpack
+
+do
+  local round = function(x, increment)
+    increment = increment or 1
+    x = x / increment
+    return (x > 0 and math.floor(x + 0.5) or math.ceil(x - 0.5)) * increment
+  end
+
+  local tbl_has_tostring = function(tbl)
+    local mt = getmetatable(tbl)
+    return mt and mt.__tostring ~= nil
+  end
+
+  local make_string = function(...)
+    local t = {}
+    for i = 1, select("#", ...) do
+      local x = select(i, ...)
+
+      if type(x) == "number" and config.float_precision then
+        x = tostring(round(x, config.float_precision))
+      elseif type(x) == "table" and not tbl_has_tostring(x) then
+        x = vim.inspect(x)
+      else
+        x = tostring(x)
+      end
+
+      t[#t + 1] = x
+    end
+    return table.concat(t, " ")
+  end
+
+  local log_at_level = function(level_config, message_maker, ...)
+    -- Return early if we're below the current_log_level
+    --
+    -- the log level source get from config directly because otherwise it doesn't work
+    if level_config.level < c.log_level then
+      return
+    end
+    local nameupper = level_config.name:upper()
+
+    local msg = message_maker(...)
+    local info = debug.getinfo(2, "Sl")
+    local lineinfo = info.short_src .. ":" .. info.currentline
+
+    -- Output to console
+    if config.use_console then
+      local log_to_console = function()
+        local console_string =
+          string.format("[%-6s%s] %s: %s", nameupper, os.date "%H:%M:%S", lineinfo, msg)
+
+        if config.highlights and level_config.hl then
+          vim.cmd(string.format("echohl %s", level_config.hl))
+        end
+
+        local split_console = vim.split(console_string, "\n")
+        for _, v in ipairs(split_console) do
+          local formatted_msg = string.format("[%s] %s", config.name, vim.fn.escape(v, [["\]]))
+
+          ---@diagnostic disable-next-line: param-type-mismatch
+          local ok = pcall(vim.cmd, string.format([[echom "%s"]], formatted_msg))
+          if not ok then
+            vim.api.nvim_out_write(msg .. "\n")
+          end
+        end
+
+        if config.highlights and level_config.hl then
+          vim.cmd "echohl NONE"
+        end
+      end
+      if config.use_console == "sync" and not vim.in_fast_event() then
+        log_to_console()
+      else
+        vim.schedule(log_to_console)
+      end
+    end
+
+    -- Output to log file
+    if config.use_file then
+      local fp = assert(io.open(log.get_outfile(), "a"))
+      local str = string.format("[%-6s%s] %s: %s\n", nameupper, os.date(), lineinfo, msg)
+      fp:write(str)
+      fp:close()
+    end
+  end
+
+  for _, x in ipairs(config.modes) do
+    -- log.info("these", "are", "separated")
+    log[x.name] = function(...) ---@diagnostic disable-line: assign-type-mismatch
+      return log_at_level(x, make_string, ...)
+    end
+
+    -- log.fmt_info("These are %s strings", "formatted")
+    log[("fmt_%s"):format(x.name)] = function(...) ---@diagnostic disable-line: assign-type-mismatch
+      return log_at_level(x, function(...)
+        local passed = { ... }
+        local fmt = table.remove(passed, 1)
+        local inspected = {}
+        for _, v in ipairs(passed) do
+          if type(v) == "table" and tbl_has_tostring(v) then
+            table.insert(inspected, v)
+          else
+            table.insert(inspected, vim.inspect(v))
+          end
+        end
+        return string.format(fmt, unpack(inspected))
+      end, ...)
+    end
+  end
+end
+
+return log

lua/gopher/_utils/runner.lua

@@ -0,0 +1,39 @@
+local c = require "gopher.config"
+local runner = {}
+
+---@class gopher.RunnerOpts
+---@field cwd? string
+---@field timeout? number
+---@field stdin? boolean|string|string[]
+---@field text? boolean
+
+---@param cmd (string|number)[]
+---@param on_exit fun(out:vim.SystemCompleted)
+---@param opts? gopher.RunnerOpts
+---@return vim.SystemObj
+function runner.async(cmd, on_exit, opts)
+  opts = opts or {}
+  return vim.system(cmd, {
+    cwd = opts.cwd or nil,
+    timeout = opts.timeout or c.timeout,
+    stdin = opts.stdin or nil,
+    text = opts.text or true,
+  }, on_exit)
+end
+
+---@param cmd (string|number)[]
+---@param opts? gopher.RunnerOpts
+---@return vim.SystemCompleted
+function runner.sync(cmd, opts)
+  opts = opts or {}
+  return vim
+    .system(cmd, {
+      cwd = opts.cwd or nil,
+      timeout = opts.timeout or c.timeout,
+      stdin = opts.stdin or nil,
+      text = opts.text or true,
+    })
+    :wait()
+end
+
+return runner

lua/gopher/_utils/ts.lua

@@ -0,0 +1,160 @@
+local ts = {}
+local queries = {
+  struct = [[
+    [(type_spec name: (type_identifier) @_name
+                type: (struct_type))
+     (var_declaration (var_spec
+                        name: (identifier) @_name @_var
+                        type: (struct_type)))
+     (short_var_declaration
+       left:  (expression_list (identifier) @_name @_var)
+       right: (expression_list (composite_literal
+                                 type: (struct_type))))]
+  ]],
+  struct_field = [[
+    (field_declaration name: (field_identifier) @_name)
+  ]],
+  func = [[
+    [(function_declaration name: (identifier)       @_name)
+     (method_declaration   name: (field_identifier) @_name)
+     (method_elem          name: (field_identifier) @_name)]
+  ]],
+  package = [[
+    (package_identifier) @_name
+  ]],
+  interface = [[
+    (type_spec
+      name: (type_identifier) @_name
+      type: (interface_type))
+  ]],
+  var = [[
+    [(var_declaration (var_spec name: (identifier) @_name))
+     (short_var_declaration
+       left: (expression_list (identifier) @_name @_var))]
+  ]],
+}
+
+---@param parent_type string[]
+---@param node TSNode
+---@return TSNode?
+local function get_parent_node(parent_type, node)
+  ---@type TSNode?
+  local current = node
+  while current do
+    if vim.tbl_contains(parent_type, current:type()) then
+      break
+    end
+
+    current = current:parent()
+    if current == nil then
+      return nil
+    end
+  end
+  return current
+end
+
+---@param query vim.treesitter.Query
+---@param node TSNode
+---@param bufnr integer
+---@return {name:string, is_varstruct:boolean}
+local function get_captures(query, node, bufnr)
+  local res = {}
+  for id, _node in query:iter_captures(node, bufnr) do
+    if query.captures[id] == "_name" then
+      res["name"] = vim.treesitter.get_node_text(_node, bufnr)
+    end
+
+    if query.captures[id] == "_var" then
+      res["is_varstruct"] = true
+    end
+  end
+
+  return res
+end
+
+---@class gopher.TsResult
+---@field name string Name of the struct, function, etc
+---@field start integer Line number where the declaration starts
+---@field end_ integer Line number where the declaration ends
+---@field indent integer Number of spaces/tabs in the current cursor line
+---@field is_varstruct boolean Is struct declared as `var S struct{}` or `s := struct{}{}`
+
+---@param bufnr integer
+---@param parent_type string[]
+---@param query string
+---@return gopher.TsResult
+local function do_stuff(bufnr, parent_type, query)
+  if not vim.treesitter.get_parser(bufnr, "go") then
+    error "No treesitter parser found for go"
+  end
+
+  local node = vim.treesitter.get_node { bufnr = bufnr }
+  if not node then
+    error "No nodes found under the cursor"
+  end
+
+  local parent_node = get_parent_node(parent_type, node)
+  if not parent_node then
+    error "No parent node found under the cursor"
+  end
+
+  local q = vim.treesitter.query.parse("go", query)
+  local res = get_captures(q, parent_node, bufnr)
+  assert(res.name ~= nil, "No capture name found")
+
+  local start_row, start_col, end_row, _ = parent_node:range()
+  res["indent"] = start_col
+  res["start"] = start_row + 1
+  res["end_"] = end_row + 1
+
+  return res
+end
+
+---@param bufnr integer
+function ts.get_struct_under_cursor(bufnr)
+  --- should be both type_spec and type_declaration
+  --- because in cases like `type ( T struct{}, U struct{} )`
+  ---
+  --- var_declaration is for cases like `var x struct{}`
+  --- short_var_declaration is for cases like `x := struct{}{}`
+  ---
+  --- it always chooses last struct type in the list
+  return do_stuff(bufnr, {
+    "type_spec",
+    "type_declaration",
+    "var_declaration",
+    "short_var_declaration",
+  }, queries.struct)
+end
+
+---@param bufnr integer
+function ts.get_struct_field_under_cursor(bufnr)
+  return do_stuff(bufnr, { "field_declaration" }, queries.struct_field)
+end
+
+---@param bufnr integer
+function ts.get_func_under_cursor(bufnr)
+  --- since this handles both and funcs and methods we should check for both parent nodes
+  return do_stuff(bufnr, {
+    "method_elem",
+    "function_declaration",
+    "method_declaration",
+  }, queries.func)
+end
+
+---@param bufnr integer
+function ts.get_package_under_cursor(bufnr)
+  return do_stuff(bufnr, { "package_clause" }, queries.package)
+end
+
+---@param bufnr integer
+function ts.get_interface_under_cursor(bufnr)
+  return do_stuff(bufnr, { "type_declaration" }, queries.interface)
+end
+
+---@param bufnr integer
+function ts.get_variable_under_cursor(bufnr)
+  return do_stuff(bufnr, { "var_declaration", "short_var_declaration" }, queries.var)
+end
+
+return ts

lua/gopher/_utils/ts/init.lua

@@ -1,34 +0,0 @@
-local nodes = require "gopher._utils.ts.nodes"
-local M = {
-  querys = {
-    struct_block = [[((type_declaration (type_spec name:(type_identifier) @struct.name type: (struct_type)))@struct.declaration)]],
-    em_struct_block = [[(field_declaration name:(field_identifier)@struct.name type: (struct_type)) @struct.declaration]],
-  },
-}
-
----@return table
-local function get_name_defaults()
-  return {
-    ["func"] = "function",
-    ["if"] = "if",
-    ["else"] = "else",
-    ["for"] = "for",
-  }
-end
-
----@param row any
----@param col any
----@param bufnr any
----@return table|nil
-function M.get_struct_node_at_pos(row, col, bufnr)
-  local query = M.querys.struct_block .. " " .. M.querys.em_struct_block
-  local bufn = bufnr or vim.api.nvim_get_current_buf()
-  local ns = nodes.nodes_at_cursor(query, get_name_defaults(), bufn, row, col)
-  if ns == nil then
-    print "struct not found"
-  else
-    return ns[#ns]
-  end
-end
-
-return M

lua/gopher/_utils/ts/nodes.lua

@@ -1,136 +0,0 @@
-local ts_query = require "nvim-treesitter.query"
-local parsers = require "nvim-treesitter.parsers"
-local locals = require "nvim-treesitter.locals"
-local M = {}
-
-local function intersects(row, col, sRow, sCol, eRow, eCol)
-  if sRow > row or eRow < row then
-    return false
-  end
-
-  if sRow == row and sCol > col then
-    return false
-  end
-
-  if eRow == row and eCol < col then
-    return false
-  end
-
-  return true
-end
-
----@param nodes table
----@param row string
----@param col string
----@return table
-function M.intersect_nodes(nodes, row, col)
-  local found = {}
-  for idx = 1, #nodes do
-    local node = nodes[idx]
-    local sRow = node.dim.s.r
-    local sCol = node.dim.s.c
-    local eRow = node.dim.e.r
-    local eCol = node.dim.e.c
-
-    if intersects(row, col, sRow, sCol, eRow, eCol) then
-      table.insert(found, node)
-    end
-  end
-
-  return found
-end
-
----@param nodes table
----@return table
-function M.sort_nodes(nodes)
-  table.sort(nodes, function(a, b)
-    return M.count_parents(a) < M.count_parents(b)
-  end)
-
-  return nodes
-end
-
----@param query string
----@param lang string
----@param bufnr integer
----@param pos_row string
----@return string
-function M.get_all_nodes(query, lang, _, bufnr, pos_row, _)
-  bufnr = bufnr or 0
-  pos_row = pos_row or 30000
-
-  local ok, parsed_query = pcall(function()
-    return vim.treesitter.parse_query(lang, query)
-  end)
-  if not ok then
-    return nil
-  end
-
-  local parser = parsers.get_parser(bufnr, lang)
-  local root = parser:parse()[1]:root()
-  local start_row, _, end_row, _ = root:range()
-  local results = {}
-
-  for match in ts_query.iter_prepared_matches(parsed_query, root, bufnr, start_row, end_row) do
-    local sRow, sCol, eRow, eCol, declaration_node
-    local type, name, op = "", "", ""
-    locals.recurse_local_nodes(match, function(_, node, path)
-      local idx = string.find(path, ".[^.]*$")
-      op = string.sub(path, idx + 1, #path)
-      type = string.sub(path, 1, idx - 1)
-
-      if op == "name" then
-        name = vim.treesitter.query.get_node_text(node, bufnr)
-      elseif op == "declaration" or op == "clause" then
-        declaration_node = node
-        sRow, sCol, eRow, eCol = node:range()
-        sRow = sRow + 1
-        eRow = eRow + 1
-        sCol = sCol + 1
-        eCol = eCol + 1
-      end
-    end)
-
-    if declaration_node ~= nil then
-      table.insert(results, {
-        declaring_node = declaration_node,
-        dim = { s = { r = sRow, c = sCol }, e = { r = eRow, c = eCol } },
-        name = name,
-        operator = op,
-        type = type,
-      })
-    end
-  end
-
-  return results
-end
-
----@param query string
----@param default string
----@param bufnr string
----@param row string
----@param col string
----@return table
-function M.nodes_at_cursor(query, default, bufnr, row, col)
-  bufnr = bufnr or vim.api.nvim_get_current_buf()
-  local ft = vim.api.nvim_buf_get_option(bufnr, "ft")
-  if row == nil or col == nil then
-    row, col = unpack(vim.api.nvim_win_get_cursor(0))
-  end
-
-  local nodes = M.get_all_nodes(query, ft, default, bufnr, row, col)
-  if nodes == nil then
-    print "Unable to find any nodes. place your cursor on a go symbol and try again"
-    return nil
-  end
-
-  nodes = M.sort_nodes(M.intersect_nodes(nodes, row, col))
-  if nodes == nil or #nodes == 0 then
-    print("Unable to find any nodes at pos. " .. tostring(row) .. ":" .. tostring(col))
-    return nil
-  end
-
-  return nodes
-end
-
-return M

lua/gopher/comment.lua

@@ -0,0 +1,71 @@
+---@toc_entry Generate comments
+---@tag gopher.nvim-comments
+---@text
+--- This module provides a way to generate comments for Go code.
+---
+---@usage
+--- Set cursor on line with function/method/struct/etc and
+--- run `:GoCmt` to generate a comment.
+
+local ts = require "gopher._utils.ts"
+local log = require "gopher._utils.log"
+local u = require "gopher._utils"
+local comment = {}
+
+--- NOTE: The order of functions executed inside this function is IMPORTANT.
+--- This function is extremely fragile; run tests after making any changes.
+---
+---@param bufnr integer
+---@param line string
+---@return string
+---@dochide
+local function generate(bufnr, line)
+  local sf_ok, sf_res = pcall(ts.get_struct_field_under_cursor, bufnr)
+  if sf_ok then
+    return u.indent(line, sf_res.indent) .. "// " .. sf_res.name .. " "
+  end
+
+  local s_ok, s_res = pcall(ts.get_struct_under_cursor, bufnr)
+  if s_ok then
+    return u.indent(line, s_res.indent) .. "// " .. s_res.name .. " "
+  end
+
+  local v_ok, v_res = pcall(ts.get_variable_under_cursor, bufnr)
+  if v_ok then
+    return u.indent(line, v_res.indent) .. "// " .. v_res.name .. " "
+  end
+
+  local f_ok, f_res = pcall(ts.get_func_under_cursor, bufnr)
+  if f_ok then
+    return u.indent(line, f_res.indent) .. "// " .. f_res.name .. " "
+  end
+
+  local i_ok, i_res = pcall(ts.get_interface_under_cursor, bufnr)
+  if i_ok then
+    return u.indent(line, i_res.indent) .. "// " .. i_res.name .. " "
+  end
+
+  local p_ok, p_res = pcall(ts.get_package_under_cursor, bufnr)
+  if p_ok then
+    return "// Package " .. p_res.name .. " provides "
+  end
+
+  return "// "
+end
+
+function comment.comment()
+  local bufnr = vim.api.nvim_get_current_buf()
+  local lnum = vim.fn.getcurpos()[2]
+  local line = vim.fn.getline(lnum)
+  local cmt = generate(bufnr, line)
+  log.debug("generated comment:", {
+    comment = cmt,
+    line = line,
+  })
+
+  vim.fn.append(lnum - 1, cmt)
+  vim.fn.setpos(".", { bufnr, lnum, #cmt })
+  vim.cmd "startinsert!"
+end
+
+return comment

lua/gopher/config.lua

@@ -0,0 +1,142 @@
+---@type gopher.Config
+---@dochide
+---@diagnostic disable-next-line: missing-fields .setup() gets injected later
+local config = {}
+
+---@tag gopher.nvim-config.ConfigGoTagTransform
+---@text Possible values for |gopher.Config|.gotag.transform:
+---
+---@dochide
+---@alias gopher.ConfigGoTagTransform
+---| "snakecase"  "GopherUser" -> "gopher_user"
+---| "camelcase"  "GopherUser" -> "gopherUser"
+---| "lispcase"   "GopherUser" -> "gopher-user"
+---| "pascalcase" "GopherUser" -> "GopherUser"
+---| "titlecase"  "GopherUser" -> "Gopher User"
+---| "keep"       keeps the original field name
+
+---@toc_entry Config
+---@tag gopher.nvim-config
+---@eval return MiniDoc.afterlines_to_code(MiniDoc.current.eval_section)
+---@class gopher.Config
+---@field setup fun(user_config?: gopher.Config)
+local default_config = {
+  -- log level, you might consider using DEBUG or TRACE for debugging the plugin
+  ---@type number
+  log_level = vim.log.levels.INFO,
+
+  -- timeout for running internal commands
+  ---@type number
+  timeout = 2000,
+
+  -- timeout for running installer commands(e.g :GoDepsInstall, :GoDepsInstallSync)
+  ---@type number
+  installer_timeout = 999999,
+
+  -- user specified paths to binaries
+  ---@class gopher.ConfigCommand
+  commands = {
+    go = "go",
+    gomodifytags = "gomodifytags",
+    gotests = "gotests",
+    impl = "impl",
+    iferr = "iferr",
+    json2go = "json2go",
+  },
+  ---@class gopher.ConfigGotests
+  gotests = {
+    -- a default template that gotess will use.
+    -- gotets doesn't have template named `default`, we use it to represent absence of the provided template.
+    template = "default",
+
+    -- path to a directory containing custom test code templates
+    ---@type string|nil
+    template_dir = nil,
+
+    -- use named tests(map with test name as key) in table tests(slice of structs by default)
+    named = false,
+  },
+  ---@class gopher.ConfigGoTag
+  gotag = {
+    ---@type gopher.ConfigGoTagTransform
+    transform = "snakecase",
+
+    -- default tags to add to struct fields
+    default_tag = "json",
+
+    -- default tag option added struct fields, set to nil to disable
+    -- e.g: `option = "json=omitempty,xml=omitempty`
+    ---@type string|nil
+    option = nil,
+  },
+  ---@class gopher.ConfigIfErr
+  iferr = {
+    -- choose a custom error message, nil to use default
+    -- e.g: `message = 'fmt.Errorf("failed to %w", err)'`
+    ---@type string|nil
+    message = nil,
+  },
+  ---@class gopher.ConfigJson2Go
+  json2go = {
+    -- command used to open interactive input.
+    -- e.g: `split`, `botright split`, `tabnew`
+    interactive_cmd = "vsplit",
+
+    -- name of autogenerated struct, if nil none, will the default one of json2go.
+    -- e.g: "MySuperCoolName"
+    ---@type string|nil
+    type_name = nil,
+  },
+}
+--minidoc_afterlines_end
+
+---@type gopher.Config
+---@dochide
+local _config = default_config
+
+-- I am kinda secret so don't tell anyone about me even dont use me
+--
+-- if you don't believe me that i am secret see
+-- the line below it says @private
+---@private
+_config.___plugin_name = "gopher.nvim" ---@diagnostic disable-line: inject-field
+
+---@param user_config? gopher.Config
+---@dochide
+function config.setup(user_config)
+  vim.validate("user_config", user_config, "table", true)
+
+  _config = vim.tbl_deep_extend("force", vim.deepcopy(default_config), user_config or {})
+
+  vim.validate("log_level", _config.log_level, "number")
+  vim.validate("timeout", _config.timeout, "number")
+  vim.validate("installer_timeout", _config.timeout, "number")
+  vim.validate("commands", _config.commands, "table")
+  vim.validate("commands.go", _config.commands.go, "string")
+  vim.validate("commands.gomodifytags", _config.commands.gomodifytags, "string")
+  vim.validate("commands.gotests", _config.commands.gotests, "string")
+  vim.validate("commands.impl", _config.commands.impl, "string")
+  vim.validate("commands.iferr", _config.commands.iferr, "string")
+  vim.validate("commands.json2go", _config.commands.json2go, "string")
+  vim.validate("gotests", _config.gotests, "table")
+  vim.validate("gotests.template", _config.gotests.template, "string")
+  vim.validate("gotests.template_dir", _config.gotests.template_dir, { "string", "nil" })
+  vim.validate("gotests.named", _config.gotests.named, "boolean")
+  vim.validate("gotag", _config.gotag, "table")
+  vim.validate("gotag.transform", _config.gotag.transform, "string")
+  vim.validate("gotag.default_tag", _config.gotag.default_tag, "string")
+  vim.validate("gotag.option", _config.gotag.option, { "string", "nil" })
+  vim.validate("iferr", _config.iferr, "table")
+  vim.validate("iferr.message", _config.iferr.message, { "string", "nil" })
+  vim.validate("json2go.installer_timeout", _config.json2go.interactive_cmd, "string")
+  vim.validate("json2go.type_name", _config.json2go.type_name, { "string", "nil" })
+end
+
+setmetatable(config, {
+  __index = function(_, key)
+    return _config[key]
+  end,
+})
+
+---@dochide
+return config

lua/gopher/go.lua

@@ -0,0 +1,56 @@
+local c = require "gopher.config"
+local u = require "gopher._utils"
+local r = require "gopher._utils.runner"
+local go = {}
+
+local function run(subcmd, args)
+  local rs = r.sync { c.commands.go, subcmd, unpack(args) }
+  if rs.code ~= 0 then
+    error("go " .. subcmd .. " failed: " .. rs.stderr)
+  end
+
+  u.notify(c.commands.go .. " " .. subcmd .. " ran successful")
+  return rs.stdout
+end
+
+---@param args string[]
+function go.get(args)
+  for i, arg in ipairs(args) do
+    local m = string.match(arg, "^https://(.*)$") or string.match(arg, "^http://(.*)$") or arg
+    table.remove(args, i)
+    table.insert(args, i, m)
+  end
+
+  run("get", args)
+end
+
+---@param args string[]
+function go.mod(args)
+  run("mod", args)
+end
+
+---@param args string[]
+function go.work(args)
+  -- TODO: use `gopls.tidy`
+
+  run("work", args)
+end
+
+---Executes `go generate`
+---If only argument is `%` it's going to be equivalent to `go generate <path to current file>`
+---@param args string[]
+function go.generate(args)
+  -- TODO: use `gopls.generate`
+
+  if #args == 0 then
+    error "please provide arguments"
+  end
+
+  if #args == 1 and args[1] == "%" then
+    args[1] = vim.fn.expand "%"
+  end
+
+  run("generate", args)
+end
+
+return go

lua/gopher/goget.lua

@@ -1,27 +0,0 @@
-local Job = require "plenary.job"
-
-return function(...)
-  local args = { ... }
-  for i, arg in ipairs(args) do
-    local m = string.match(arg, "^https://(.*)$") or string.match(arg, "^http://(.*)$") or arg
-    table.remove(args, i)
-    table.insert(args, i, m)
-  end
-
-  local cmd_args = vim.list_extend({ "get" }, args)
-
-  Job
-    :new({
-      command = "go",
-      args = cmd_args,
-      on_exit = function(_, retval)
-        if retval ~= 0 then
-          print("command exited with code " .. retval)
-          return
-        else
-          print "command runs successfully"
-        end
-      end,
-    })
-    :start()
-end

lua/gopher/gomod.lua

@@ -1,21 +0,0 @@
-local Job = require "plenary.job"
-
-return function(...)
-  local args = { ... }
-  local cmd_args = vim.list_extend({ "mod" }, args)
-
-  Job
-    :new({
-      command = "go",
-      args = cmd_args,
-      on_exit = function(_, retval)
-        if retval ~= 0 then
-          print("command exited with code " .. retval)
-          return
-        else
-          print "command runs successfully"
-        end
-      end,
-    })
-    :start()
-end

lua/gopher/gotests.lua

@@ -0,0 +1,76 @@
+---@toc_entry Generating unit tests boilerplate
+---@tag gopher.nvim-gotests
+---@text gotests is utilizing the `gotests` tool to generate unit tests boilerplate.
+---@usage
+--- - Generate unit test for specific function/method:
+---  1. Place your cursor on the desired function/method.
+---  2. Run `:GoTestAdd`
+---
+--- - Generate unit tests for *all* functions/methods in current file:
+---  - run `:GoTestsAll`
+---
+--- - Generate unit tests *only* for *exported(public)* functions/methods:
+---  - run `:GoTestsExp`
+---
+--- You can also specify the template to use for generating the tests.
+--- See |gopher.nvim-config|.
+--- More details about templates: https://github.com/cweill/gotests
+---
+--- If you prefer named tests, you can enable them in |gopher.nvim-config|.
+
+local c = require "gopher.config"
+local ts_utils = require "gopher._utils.ts"
+local r = require "gopher._utils.runner"
+local u = require "gopher._utils"
+local log = require "gopher._utils.log"
+local gotests = {}
+
+---@param args table
+---@dochide
+local function add_test(args)
+  if c.gotests.named then
+    table.insert(args, "-named")
+  end
+
+  if c.gotests.template_dir then
+    table.insert(args, "-template_dir")
+    table.insert(args, c.gotests.template_dir)
+  end
+
+  if c.gotests.template ~= "default" then
+    table.insert(args, "-template")
+    table.insert(args, c.gotests.template)
+  end
+
+  table.insert(args, "-w")
+  table.insert(args, vim.fn.expand "%")
+
+  log.debug("generating tests with args: ", args)
+
+  local rs = r.sync { c.commands.gotests, unpack(args) }
+  if rs.code ~= 0 then
+    error("gotests failed: " .. rs.stderr)
+  end
+
+  u.notify "unit test(s) generated"
+end
+
+-- generate unit test for one function
+function gotests.func_test()
+  local bufnr = vim.api.nvim_get_current_buf()
+  local func = ts_utils.get_func_under_cursor(bufnr)
+
+  add_test { "-only", func.name }
+end
+
+-- generate unit tests for all functions in current file
+function gotests.all_tests()
+  add_test { "-all" }
+end
+
+-- generate unit tests for all exported functions
+function gotests.all_exported_tests()
+  add_test { "-exported" }
+end
+
+return gotests

lua/gopher/health.lua

@@ -1,36 +1,59 @@
-local utils = require "gopher._utils"
-local M = {
-  _required = {
-    plugins = {
-      { lib = "plenary" },
-      { lib = "nvim-treesitter" },
+local c = require("gopher.config").commands
+local health = {}
+
+local deps = {
+  vim_version = "nvim-0.10",
+  bin = {
+    {
+      bin = c.go,
+      msg = "required for `:GoGet`, `:GoMod`, `:GoGenerate`, `:GoWork`, `:GoInstallDeps`, `:GoInstallDepsSync`",
     },
-    binarys = {
-      { bin = "go", help = "required for GoMod command" },
-      { bin = "gomodifytags", help = "required for modify struct tags" },
-      { bin = "impl", help = "required for interface implementing" },
+    { bin = c.gomodifytags, msg = "required for `:GoTagAdd`, `:GoTagRm`" },
+    { bin = c.impl, msg = "required for `:GoImpl`" },
+    { bin = c.iferr, msg = "required for `:GoIfErr`" },
+    { bin = c.gotests, msg = "required for `:GoTestAdd`, `:GoTestsAll`, `:GoTestsExp`" },
   },
+  treesitter = {
+    { parser = "go", msg = "required for most of the parts of `gopher.nvim`" },
   },
 }
 
-function M.check()
-  vim.health.report_start "Required plugins"
-  for _, plugin in ipairs(M._required.plugins) do
-    if utils.lualib_is_found(plugin.lib) then
-      vim.health.report_ok(plugin.lib .. " installed.")
+---@param bin {bin:string, msg:string, optional:boolean}
+local function check_binary(bin)
+  if vim.fn.executable(bin.bin) == 1 then
+    vim.health.ok(bin.bin .. " is found oh PATH: `" .. vim.fn.exepath(bin.bin) .. "`")
   else
-      vim.health.report_error(plugin.lib .. " not found. Gopher.nvim will not work without it!")
+    vim.health.error(bin.bin .. " not found on PATH, " .. bin.msg)
   end
 end
 
-  vim.health.report_start "Required go tools"
-  for _, binary in ipairs(M._required.binarys) do
-    if utils.binary_is_found(binary.bin) then
-      vim.health.report_ok(binary.bin .. " installed")
+---@param ts {parser:string, msg:string}
+local function check_treesitter(ts)
+  local ok, parser = pcall(vim.treesitter.get_parser, 0, ts.parser)
+  if ok and parser ~= nil then
+    vim.health.ok("`" .. ts.parser .. "` parser is installed")
   else
-      vim.health.report_warn(binary.bin .. " is not installed but " .. binary.help)
-    end
+    vim.health.error("`" .. ts.parser .. "` parser not found")
   end
 end
 
-return M
+function health.check()
+  vim.health.start "Neovim version"
+  if vim.fn.has(deps.vim_version) == 1 then
+    vim.health.ok "Neovim version is compatible"
+  else
+    vim.health.error(deps.vim_version .. " or newer is required")
+  end
+
+  vim.health.start "Required binaries (those can be installed with `:GoInstallDeps`)"
+  for _, bin in ipairs(deps.bin) do
+    check_binary(bin)
+  end
+
+  vim.health.start "Treesitter"
+  for _, parser in ipairs(deps.treesitter) do
+    check_treesitter(parser)
+  end
+end
+
+return health

lua/gopher/iferr.lua

@@ -0,0 +1,48 @@
+-- Thanks https://github.com/koron/iferr for vim implementation
+
+---@toc_entry Iferr
+---@tag gopher.nvim-iferr
+---@text
+--- `iferr` provides a way to way to automatically insert `if err != nil` check.
+--- If you want to change `-message` option of `iferr` tool, see |gopher.nvim-config|
+---
+---@usage Execute `:GoIfErr` near any `err` variable to insert the check
+
+local c = require "gopher.config"
+local u = require "gopher._utils"
+local r = require "gopher._utils.runner"
+local log = require "gopher._utils.log"
+local iferr = {}
+
+function iferr.iferr()
+  local curb = vim.fn.wordcount().cursor_bytes
+  local pos = vim.fn.getcurpos()[2]
+  local fpath = vim.fn.expand "%"
+
+  local cmd = { c.commands.iferr, "-pos", curb }
+  if c.iferr.message ~= nil and type(c.iferr.message) == "string" then
+    table.insert(cmd, "-message")
+    table.insert(cmd, c.iferr.message)
+  end
+
+  local rs = r.sync(cmd, {
+    stdin = u.readfile_joined(fpath),
+  })
+
+  if rs.code ~= 0 then
+    if string.find(rs.stderr, "no functions at") then
+      u.notify("iferr: no function at " .. curb, vim.log.levels.ERROR)
+      log.warn("iferr: no function at " .. curb)
+      return
+    end
+
+    log.error("ferr: failed. output: " .. rs.stderr)
+    error("iferr failed: " .. rs.stderr)
+  end
+
+  vim.fn.append(pos, u.remove_empty_lines(vim.split(rs.stdout, "\n")))
+  vim.cmd [[silent normal! j=2j]]
+  vim.fn.setpos(".", pos --[[@as integer[] ]])
+end
+
+return iferr

lua/gopher/impl.lua

@@ -1,74 +1,80 @@
-local Job = require "plenary.job"
+---@toc_entry Auto implementation of interface methods
+---@tag gopher.nvim-impl
+---@text
+--- Integration of `impl` tool to generate method stubs for interfaces.
+---
+---@usage
+--- 1. Automatically implement an interface for a struct:
+---  - Place your cursor on the struct where you want to implement the interface.
+---  - Run `:GoImpl io.Reader`
+---  - This will automatically determine the receiver and implement the `io.Reader` interface.
+---
+--- 2. Specify a custom receiver:
+---  - Place your cursor on the struct
+---  - Run `:GoImpl w io.Writer`, where:
+---   - `w` is the receiver.
+---   - `io.Writer` is the interface to implement.
+---
+--- 3. Explicitly specify the receiver, struct, and interface:
+---  - No need to place the cursor on the struct if all arguments are provided.
+---  - Run `:GoImpl r RequestReader io.Reader`, where:
+---   - `r` is the receiver.
+---   - `RequestReader` is the struct.
+---   - `io.Reader` is the interface to implement.
+---
+--- Example:
+--- >go
+---    type BytesReader struct{}
+---    //    ^ put your cursor here
+---    // run `:GoImpl b io.Reader`
+---
+---    // this is what you will get
+---    func (b *BytesReader) Read(p []byte) (n int, err error) {
+---        panic("not implemented") // TODO: Implement
+---    }
+--- <
+
+local c = require("gopher.config").commands
+local r = require "gopher._utils.runner"
 local ts_utils = require "gopher._utils.ts"
+local u = require "gopher._utils"
+local impl = {}
 
-local function get_struct()
-  local ns = ts_utils.get_struct_node_at_pos(unpack(vim.api.nvim_win_get_cursor(0)))
-  if ns == nil then
-    print "put cursor on struct or specify a receiver"
-    return ""
-  end
-
-  vim.api.nvim_win_set_cursor(0, {
-    ns.dim.e.r,
-    ns.dim.e.c,
-  })
-
-  return ns.name
-end
-
-return function(...)
+function impl.impl(...)
   local args = { ... }
-  local iface, recv_name = "", ""
-  local recv = get_struct()
+  local iface, recv = "", ""
+  local bufnr = vim.api.nvim_get_current_buf()
 
   if #args == 0 then
-    iface = vim.fn.input "impl: generating method stubs for interface: "
-    vim.cmd "redeaw!"
-    if iface == "" then
-      print "usage: GoImpl f *File io.Reader"
-    end
-  elseif #args == 1 then -- :GoImpl io.Reader
-    recv = string.lower(recv) .. " *" .. recv
-    vim.cmd "redraw!"
-    iface = select(1, ...)
-  elseif #args == 2 then -- :GoImpl w io.Writer
-    recv_name = select(1, ...)
-    recv = string.format("%s *%s", recv_name, recv)
-    iface = select(#args, ...)
-  elseif #args > 2 then
-    iface = select(#args, ...)
-    recv = select(#args - 1, ...)
-    recv_name = select(#args - 2, ...)
-    recv = string.format("%s %s", recv_name, recv)
-  end
-
-  -- stylua: ignore
-  local cmd_args = {
-    "-dir", vim.fn.fnameescape(vim.fn.expand "%:p:h"), ---@diagnostic disable-line: missing-parameter
-    recv,
-    iface
-  }
-
-  local res_data
-  Job
-    :new({
-      command = "impl",
-      args = cmd_args,
-      on_exit = function(data, retval)
-        if retval ~= 0 then
-          print("command exited with code " .. retval)
+    u.notify("arguments not provided. usage: :GoImpl f *File io.Reader", vim.log.levels.ERROR)
     return
+  elseif #args == 1 then -- :GoImpl io.Reader
+    local st = ts_utils.get_struct_under_cursor(bufnr)
+    iface = args[1]
+    recv = string.lower(st.name) .. " *" .. st.name
+  elseif #args == 2 then -- :GoImpl w io.Writer
+    local st = ts_utils.get_struct_under_cursor(bufnr)
+    iface = args[2]
+    recv = args[1] .. " *" .. st.name
+  elseif #args == 3 then -- :GoImpl r Struct io.Reader
+    recv = args[1] .. " *" .. args[2]
+    iface = args[3]
   end
 
-        res_data = data:result()
-      end,
-    })
-    :sync()
+  assert(iface ~= "", "interface not provided")
+  assert(recv ~= "", "receiver not provided")
+
+  local dir = vim.fn.fnameescape(vim.fn.expand "%:p:h")
+  local rs = r.sync { c.impl, "-dir", dir, recv, iface }
+  if rs.code ~= 0 then
+    error("failed to implement interface: " .. rs.stderr)
+  end
 
   local pos = vim.fn.getcurpos()[2]
-  table.insert(res_data, 1, "")
-  vim.fn.append(pos, res_data)
+  local output = u.remove_empty_lines(vim.split(rs.stdout, "\n"))
 
-  -- table.insert(res_data, 1, "")
-  -- vim.fn.append(vim.fn.getcurpos()[2], res_data)
+  table.insert(output, 1, "")
+  vim.fn.append(pos, output)
 end
+
+return impl

lua/gopher/init.lua

@@ -1,11 +1,66 @@
+--- *gopher.nvim* Enhance your golang experience
+---
+--- MIT License Copyright (c) 2025 Oleksandr Smirnov
+---
+--- ==============================================================================
+---
+--- gopher.nvim is a minimalistic plugin for Go development in Neovim written in Lua.
+--- It's not an LSP tool, the main goal of this plugin is add go tooling support in Neovim.
+---
+--- Table of Contents
+---@toc
+
+local log = require "gopher._utils.log"
 local tags = require "gopher.struct_tags"
+local tests = require "gopher.gotests"
+local go = require "gopher.go"
 local gopher = {}
 
-gopher.install_deps = require "gopher.installer"
-gopher.tags_add = tags.add
-gopher.tags_rm = tags.remove
-gopher.mod = require "gopher.gomod"
-gopher.get = require "gopher.goget"
-gopher.impl = require "gopher.impl"
+---@toc_entry Setup
+---@tag gopher.nvim-setup()
+---@text Setup function. This method simply merges default config with opts table.
+--- You can read more about configuration at |gopher.nvim-config|
+--- Calling this function is optional, if you ok with default settings.
+--- See |gopher.nvim.config|
+---
+---@usage >lua
+---  require("gopher").setup {} -- use default config or replace {} with your own
+--- <
+---@param user_config gopher.Config See |gopher.nvim-config|
+gopher.setup = function(user_config)
+  log.debug "setting up config"
+  require("gopher.config").setup(user_config)
+  log.debug(vim.inspect(user_config))
+end
+
+---@toc_entry Install dependencies
+---@tag gopher.nvim-dependencies
+---@text
+--- Gopher.nvim implements most of its features using third-party tools. To
+--- install plugin's dependencies, you can run:
+--- `:GoInstallDeps` or `:GoInstallDepsSync`
+--- or use `require("gopher").install_deps()` if you prefer lua api.
+gopher.install_deps = require("gopher.installer").install_deps
+
+gopher.impl = require("gopher.impl").impl
+gopher.iferr = require("gopher.iferr").iferr
+gopher.comment = require("gopher.comment").comment
+
+gopher.tags = {
+  add = tags.add,
+  rm = tags.remove,
+  clear = tags.clear,
+}
+
+gopher.test = {
+  add = tests.func_test,
+  exported = tests.all_exported_tests,
+  all = tests.all_tests,
+}
+
+gopher.get = go.get
+gopher.mod = go.mod
+gopher.work = go.work
+gopher.generate = go.generate
 
 return gopher

lua/gopher/installer.lua

@@ -1,31 +1,66 @@
-local Job = require "plenary.job"
+local c = require "gopher.config"
+local r = require "gopher._utils.runner"
+local u = require "gopher._utils"
+local log = require "gopher._utils.log"
+local installer = {}
+
 local urls = {
-  gomodifytags = "github.com/fatih/gomodifytags",
-  impl = "github.com/josharian/impl",
+  gomodifytags = "github.com/fatih/gomodifytags@latest",
+  impl = "github.com/josharian/impl@latest",
+  gotests = "github.com/cweill/gotests/...@develop",
+  iferr = "github.com/koron/iferr@latest",
+  json2go = "olexsmir.xyz/json2go/cmd/json2go@latest",
 }
 
-local function install(pkg)
-  local url = urls[pkg] .. "@latest"
+---@param opt vim.SystemCompleted
+---@param url string
+local function handle_intall_exit(opt, url)
+  if opt.code ~= 0 then
+    vim.schedule(function()
+      u.notify("go install failed: " .. url)
+    end)
 
-  Job
-    :new({
-      command = "go",
-      args = { "install", url },
-      on_exit = function(_, ret_val)
-        if ret_val ~= 0 then
-          print("command exited with code " .. ret_val)
+    log.error("go install failed:", "url", url, "opt", vim.inspect(opt))
     return
   end
 
-        print("install " .. url .. " finished")
-      end,
-    })
-    :sync()
+  vim.schedule(function()
+    u.notify("go install-ed: " .. url)
+  end)
+end
+
+---@param url string
+local function install(url)
+  vim.schedule(function()
+    u.notify("go install-ing: " .. url)
+  end)
+
+  r.async({ c.commands.go, "install", url }, function(opt)
+    handle_intall_exit(opt, url)
+  end, { timeout = c.installer_timeout })
+end
+
+---@param url string
+local function install_sync(url)
+  vim.schedule(function()
+    u.notify("go install-ing: " .. url)
+  end)
+
+  local rs = r.sync({ c.commands.go, "install", url }, { timeout = c.installer_timeout })
+  handle_intall_exit(rs, url)
 end
 
 ---Install required go deps
-return function()
-  for pkg, _ in pairs(urls) do
-    install(pkg)
+---@param opts? {sync:boolean}
+function installer.install_deps(opts)
+  opts = opts or {}
+  for _, url in pairs(urls) do
+    if opts.sync then
+      install_sync(url)
+    else
+      install(url)
     end
   end
+end
+
+return installer

lua/gopher/json2go.lua

@@ -0,0 +1,137 @@
+---@toc_entry json2go
+---@tag gopher.nvim-json2go
+---@text
+--- Convert json to go type annotations.
+---
+---@usage
+--- `:GoJson` opens a temporary buffer where you can paste or write JSON.
+--- Saving the buffer (`:w` or `:wq`) automatically closes it and inserts the
+--- generated Go struct into the original buffer at the cursor position.
+---
+--- Alternatively, you can pass JSON directly as an argument:
+--- >vim
+---    :GoJson {"name": "Alice", "age": 30}
+--- <
+
+local c = require "gopher.config"
+local log = require "gopher._utils.log"
+local u = require "gopher._utils"
+local r = require "gopher._utils.runner"
+local json2go = {}
+
+---@dochide
+---@param bufnr integer
+---@param cpos integer
+---@param type_ string
+local function apply(bufnr, cpos, type_)
+  local lines = vim.api.nvim_buf_get_lines(bufnr, 0, -1, false)
+  local input_lines = u.remove_empty_lines(vim.split(type_, "\n"))
+  for i, line in pairs(input_lines) do
+    table.insert(lines, cpos + i, line)
+  end
+  vim.api.nvim_buf_set_lines(bufnr, 0, -1, true, lines)
+end
+
+-- Convert json string to go type.
+---
+---@param json_str string Json string that is going to be converted to go type.
+---@return string? Go type, or nil if failed.
+function json2go.transform(json_str)
+  local cmd = { c.commands.json2go }
+  if c.json2go.type_name then
+    table.insert(cmd, "-type", c.json2go.type_name)
+  end
+
+  local rs = r.sync(cmd, { stdin = json_str })
+  if rs.code ~= 0 then
+    u.notify("json2go: got this error: " .. rs.stdout, vim.log.levels.ERROR)
+    log.error("json2go: got this error: " .. rs.stdout)
+    return
+  end
+  return rs.stdout
+end
+
+---@dochide
+---@param ocpos integer
+local function interactive(ocpos)
+  local obuf = vim.api.nvim_get_current_buf()
+  local owin = vim.api.nvim_get_current_win()
+
+  -- setup the input window
+  local buf = vim.api.nvim_create_buf(false, true)
+  vim.cmd(c.json2go.interactive_cmd)
+
+  local win = vim.api.nvim_get_current_win()
+  vim.api.nvim_win_set_buf(win, buf)
+  vim.api.nvim_buf_set_name(buf, "[GoJson input]")
+  vim.api.nvim_set_option_value("filetype", "jsonc", { buf = buf })
+  vim.api.nvim_set_option_value("buftype", "acwrite", { buf = buf })
+  vim.api.nvim_set_option_value("swapfile", false, { buf = buf })
+  vim.api.nvim_set_option_value("bufhidden", "delete", { buf = buf })
+  vim.api.nvim_buf_set_lines(buf, 0, -1, false, {
+    "// Write your json here.",
+    "// Writing and quitting (:wq), will generate go struct under the cursor.",
+    "",
+    "",
+  })
+
+  vim.api.nvim_create_autocmd("BufLeave", { buffer = buf, command = "stopinsert" })
+  vim.api.nvim_create_autocmd("BufWriteCmd", {
+    buffer = buf,
+    once = true,
+    callback = function()
+      local input = vim.api.nvim_buf_get_lines(buf, 0, -1, true)
+      local inp = table.concat(
+        vim
+          .iter(input)
+          :filter(function(line)
+            local found = string.find(line, "^//.*")
+            return (not found) or (line == "")
+          end)
+          :totable(),
+        "\n"
+      )
+
+      local go_type = json2go.transform(inp)
+      if not go_type then
+        error "cound't convert json to go type"
+      end
+
+      vim.api.nvim_set_option_value("modified", false, { buf = buf })
+      apply(obuf, ocpos, go_type)
+
+      vim.api.nvim_set_current_win(owin)
+      vim.api.nvim_win_set_cursor(owin, { ocpos + 1, 0 })
+
+      vim.schedule(function()
+        pcall(vim.api.nvim_win_close, win, true)
+        pcall(vim.api.nvim_buf_delete, buf, {})
+      end)
+    end,
+  })
+
+  vim.cmd "normal! G"
+  vim.cmd "startinsert"
+end
+
+--- Converts json string to go type, and puts result under the cursor. If
+--- [json_str] is nil, will open an interactive prompt (with cmd set in
+--- config).
+---
+---@param json_str? string
+function json2go.json2go(json_str)
+  local cur_line = vim.api.nvim_win_get_cursor(0)[1]
+  if not json_str then
+    interactive(cur_line)
+    return
+  end
+
+  local go_type = json2go.transform(json_str)
+  if not go_type then
+    error "cound't convert json to go type"
+  end
+
+  apply(0, cur_line, go_type)
+end
+
+return json2go

lua/gopher/struct_tags.lua

@@ -1,116 +1,200 @@
-local Job = require "plenary.job"
-local ts_utils = require "gopher._utils.ts"
-local utils = require "gopher._utils"
-local M = {}
+---@toc_entry Modify struct tags
+---@tag gopher.nvim-struct-tags
+---@text
+--- `struct_tags` is utilizing the `gomodifytags` tool to add or remove tags to
+--- struct fields.
+---
+---@usage
+--- How to add/remove/clear tags to struct fields:
+--- 1. Place cursor on the struct
+--- 2. Run `:GoTagAdd json` to add json tags to struct fields
+--- 3. Run `:GoTagRm json` to remove json tags to struct fields
+--- 4. Run `:GoTagClear` to clear all tags from struct fields
+---
+--- If you want to add/remove tag with options, you can use `json=omitempty`
+--- (where json is tag, and omitempty is its option).
+--- Example: `:GoTagAdd xml json=omitempty`
+---
+---
+--- NOTE: if you dont specify the tag it will use `json` as default
+---
+--- Example:
+--- >go
+---    // before
+---    type User struct {
+---    // ^ put your cursor here
+---    // run `:GoTagAdd yaml`
+---        ID int
+---        Name string
+---    }
+---
+---    // after
+---    type User struct {
+---        ID int      `yaml:id`
+---        Name string `yaml:name`
+---    }
+--- <
 
-local function modify(...)
-  local fpath = vim.fn.expand "%" ---@diagnostic disable-line: missing-parameter
-  local ns = ts_utils.get_struct_node_at_pos(unpack(vim.api.nvim_win_get_cursor(0)))
-  if ns == nil or ns == {} then
-    return
-  end
+local ts = require "gopher._utils.ts"
+local r = require "gopher._utils.runner"
+local c = require "gopher.config"
+local u = require "gopher._utils"
+local log = require "gopher._utils.log"
+local struct_tags = {}
+
+---@dochide
+---@class gopher.StructTagInput
+---@field input string[] User provided tags
+---@field range? gopher.StructTagRange  (optional)
+
+---@dochide
+---@class gopher.StructTagRange
+---@field start number
+---@field end_ number
+
+---@param fpath string
+---@param bufnr integer
+---@param range? gopher.StructTagRange
+---@param user_args string[]
+---@dochide
+local function handle_tags(fpath, bufnr, range, user_args)
+  local st = ts.get_struct_under_cursor(bufnr)
 
   -- stylua: ignore
-  local cmd_args = {
+  local cmd = {
+    c.commands.gomodifytags,
+    "-transform", c.gotag.transform,
     "-format", "json",
     "-file", fpath,
-    "-w"
+    "-w",
   }
 
-  -- by struct name of line pos
-  if ns.name == nil then
-    local _, csrow, _, _ = unpack(vim.fn.getpos ".")
-    table.insert(cmd_args, "-line")
-    table.insert(cmd_args, csrow)
+  -- `-struct` and `-line` cannot be combined, setting them separately
+  if range or st.is_varstruct then
+    table.insert(cmd, "-line")
+    table.insert(cmd, string.format("%d,%d", (range or st).start, (range or st).end_))
   else
-    table.insert(cmd_args, "-struct")
-    table.insert(cmd_args, ns.name)
+    table.insert(cmd, "-struct")
+    table.insert(cmd, st.name)
   end
 
-  -- set user args for cmd
-  local arg = { ... }
-  for _, v in ipairs(arg) do
-    table.insert(cmd_args, v)
+  for _, v in ipairs(user_args) do
+    table.insert(cmd, v)
   end
 
-  -- set default tag for "clear tags"
-  if #arg == 1 and arg[1] ~= "-clear-tags" then
-    table.insert(cmd_args, "json")
+  local rs = r.sync(cmd)
+  if rs.code ~= 0 then
+    log.error("tags: failed to set tags " .. rs.stderr)
+    error("failed to set tags " .. rs.stderr)
   end
 
-  -- get result of "gomodifytags" works
-  local res_data
-  Job
-    :new({
-      command = "gomodifytags",
-      args = cmd_args,
-      on_exit = function(data, retval)
-        if retval ~= 0 then
-          print("command exited with code " .. retval)
-          return
+  local res = vim.json.decode(rs.stdout)
+  if res["errors"] then
+    log.error("tags: got an error " .. vim.inspect(res))
+    error("failed to set tags " .. vim.inspect(res["errors"]))
   end
 
-        res_data = data:result()
-      end,
-    })
-    :sync()
-
-  -- decode goted value
-  local tagged = vim.json.decode(table.concat(res_data))
-  if
-    tagged.errors ~= nil
-    or tagged.lines == nil
-    or tagged["start"] == nil
-    or tagged["start"] == 0
-  then
-    print("failed to set tags " .. vim.inspect(tagged))
+  for i, v in ipairs(res["lines"]) do
+    res["lines"][i] = u.trimend(v)
   end
 
-  for i, v in ipairs(tagged.lines) do
-    tagged.lines[i] = utils.rtrim(v)
-  end
-
-  -- write goted tags
   vim.api.nvim_buf_set_lines(
-    0,
-    tagged.start - 1,
-    tagged.start - 1 + #tagged.lines,
-    false,
-    tagged.lines
+    bufnr,
+    res["start"] - 1,
+    res["start"] - 1 + #res["lines"],
+    true,
+    res["lines"]
   )
-  vim.cmd "write"
 end
 
----add tags to struct under cursor
----@param ... unknown
-function M.add(...)
-  local arg = { ... }
-  if #arg == nil or arg == "" then
-    arg = { "json" }
+---@dochide
+---@param option string
+local function option_to_tag(option)
+  return option:match "^(.-)="
 end
 
-  local cmd_args = { "-add-tags" }
-  for _, v in ipairs(arg) do
-    table.insert(cmd_args, v)
+---@dochide
+---@param args string[]
+local function unwrap_if_needed(args)
+  local out = {}
+  for _, v in pairs(args) do
+    for _, p in pairs(vim.split(v, ",")) do
+      table.insert(out, p)
+    end
+  end
+  return out
 end
 
-  modify(unpack(cmd_args))
+---@dochide
+---@class gopher.StructTagsArgs
+---@field tags string
+---@field options string
+
+---@dochide
+---@param args string[]
+---@return gopher.StructTagsArgs
+function struct_tags.parse_args(args)
+  args = unwrap_if_needed(args)
+
+  local tags, options = {}, {}
+  for _, v in pairs(args) do
+    if string.find(v, "=") then
+      table.insert(options, v)
+      table.insert(tags, option_to_tag(v))
+    else
+      table.insert(tags, v)
+    end
   end
 
----remove tags to struct under cursor
----@param ... unknown
-function M.remove(...)
-  local arg = { ... }
-  if #arg == nil or arg == "" then
-    arg = { "json" }
+  return {
+    tags = table.concat(u.list_unique(tags), ","),
+    options = table.concat(u.list_unique(options), ","),
+  }
 end
 
-  local cmd_args = { "-remove-tags" }
-  for _, v in ipairs(arg) do
-    table.insert(cmd_args, v)
+-- Adds tags to a struct under the cursor. See `:h gopher.nvim-struct-tags`.
+---@param opts gopher.StructTagInput
+---@dochide
+function struct_tags.add(opts)
+  log.debug("adding tags", opts)
+
+  local fpath = vim.fn.expand "%"
+  local bufnr = vim.api.nvim_get_current_buf()
+
+  local user_args = struct_tags.parse_args(opts.input)
+  handle_tags(fpath, bufnr, opts.range, {
+    "-add-tags",
+    (user_args.tags ~= "") and user_args.tags or c.gotag.default_tag,
+    (user_args.options ~= "" or c.gotag.option) and "-add-options" or nil,
+    (user_args.options ~= "") and user_args.options or c.gotag.option,
+  })
 end
 
-  modify(unpack(cmd_args))
+-- Removes tags from a struct under the cursor. See `:h gopher.nvim-struct-tags`.
+---@dochide
+---@param opts gopher.StructTagInput
+function struct_tags.remove(opts)
+  log.debug("removing tags", opts)
+
+  local fpath = vim.fn.expand "%"
+  local bufnr = vim.api.nvim_get_current_buf()
+
+  local user_args = struct_tags.parse_args(opts.input)
+  handle_tags(fpath, bufnr, opts.range, {
+    "-remove-tags",
+    (user_args.tags ~= "") and user_args.tags or c.gotag.default_tag,
+    (user_args.options ~= "" or c.gotag.option ~= nil) and "-remove-options" or nil,
+    (user_args.options ~= "") and user_args.options or c.gotag.option,
+  })
 end
 
-return M
+-- Removes all tags from a struct under the cursor.
+-- See `:h gopher.nvim-struct-tags`.
+---@dochide
+function struct_tags.clear()
+  local fpath = vim.fn.expand "%"
+  local bufnr = vim.api.nvim_get_current_buf()
+  handle_tags(fpath, bufnr, nil, { "-clear-tags" })
+end
+
+return struct_tags

nvim.toml

@@ -1,42 +1,5 @@
 [vim]
 any = true
 
-[describe]
+[MiniTest]
 any = true
-[[describe.args]]
-type = "string"
-[[describe.args]]
-type = "function"
-
-[it]
-any = true
-[[it.args]]
-type = "string"
-[[it.args]]
-type = "function"
-
-[before_each]
-any = true
-[[before_each.args]]
-type = "function"
-[[after_each.args]]
-type = "function"
-
-[assert]
-any = true
-
-[assert.is_not]
-any = true
-
-[[assert.equals.args]]
-type = "any"
-[[assert.equals.args]]
-type = "any"
-[[assert.equals.args]]
-type = "any"
-required = false
-
-[[assert.same.args]]
-type = "any"
-[[assert.same.args]]
-type = "any"

pkg.json

@@ -0,0 +1,10 @@
+{
+  "name": "gopher.nvim",
+  "engines": {
+    "nvim": "^0.10.0"
+  },
+  "repository": {
+    "type": "git",
+    "url": "https://github.com/olexsmir/gopher.nvim"
+  }
+}

plugin/gopher.lua

@@ -0,0 +1,107 @@
+---@toc_entry Commands
+---@tag gopher.nvim-commands
+---@text
+--- If don't want to automatically register plugins' commands,
+--- you can set `vim.g.gopher_register_commands` to `false`, before loading the plugin.
+
+if vim.g.gopher_register_commands == false then
+  return
+end
+
+---@param name string
+---@param fn fun(args: table)
+---@param nargs? number|"*"|"?"
+---@param range? boolean
+---@private
+local function cmd(name, fn, nargs, range)
+  vim.api.nvim_create_user_command(name, fn, {
+    nargs = nargs or 0,
+    range = range or false,
+  })
+end
+
+cmd("GopherLog", function()
+  vim.cmd("tabnew " .. require("gopher._utils.log").get_outfile())
+end)
+
+cmd("GoIfErr", function()
+  require("gopher").iferr()
+end)
+
+cmd("GoCmt", function()
+  require("gopher").comment()
+end)
+
+cmd("GoImpl", function(args)
+  require("gopher").impl(unpack(args.fargs))
+end, "*")
+
+-- :GoInstall
+cmd("GoInstallDeps", function()
+  require("gopher").install_deps()
+end)
+
+cmd("GoInstallDepsSync", function()
+  require("gopher").install_deps { sync = true }
+end)
+
+-- :GoTag
+cmd("GoTagAdd", function(opts)
+  require("gopher").tags.add {
+    input = opts.fargs,
+    range = (opts.count ~= -1) and {
+      start = opts.line1,
+      end_ = opts.line2,
+    } or nil,
+  }
+end, "*", true)
+
+cmd("GoTagRm", function(opts)
+  require("gopher").tags.rm {
+    input = opts.fargs,
+    range = (opts.count ~= -1) and {
+      start = opts.line1,
+      end_ = opts.line2,
+    } or nil,
+  }
+end, "*", true)
+
+cmd("GoTagClear", function()
+  require("gopher").tags.clear()
+end)
+
+-- :GoJson
+cmd("GoJson", function(opts)
+  local inp = ((opts.args ~= "" and opts.args) or nil)
+  require("gopher.json2go").json2go(inp)
+end, "*")
+
+-- :GoTest
+cmd("GoTestAdd", function()
+  require("gopher").test.add()
+end)
+
+cmd("GoTestsAll", function()
+  require("gopher").test.all()
+end)
+
+cmd("GoTestsExp", function()
+  require("gopher").test.exported()
+end)
+
+-- :Go
+cmd("GoMod", function(opts)
+  require("gopher").mod(opts.fargs)
+end, "*")
+
+cmd("GoGet", function(opts)
+  require("gopher").get(opts.fargs)
+end, "*")
+
+cmd("GoWork", function(opts)
+  require("gopher").get(opts.fargs)
+end, "*")
+
+cmd("GoGenerate", function(opts)
+  require("gopher").generate(opts.fargs or { "" })
+end, "?")

plugin/gopher.vim

@@ -1,6 +0,0 @@
-command! -nargs=* GoTagAdd :lua require"gopher".tags_add(<f-args>)
-command! -nargs=* GoTagRm :lua require"gopher".tags_rm(<f-args>)
-command! -nargs=* GoMod :lua require"gopher".mod(<f-args>)
-command! -nargs=* GoGet :lua require"gopher".get(<f-args>)
-command! -nargs=* GoImpl :lua require"gopher".impl(<f-args>)
-command! GoInstallDeps :lua require"gopher".install_deps()

scripts/docgen.lua

@@ -0,0 +1,38 @@
+---@diagnostic disable: undefined-global
+--# selene: allow(undefined_variable)
+
+local okay, minidoc = pcall(require, "mini.doc")
+if not okay then
+  error "mini.doc not found, please install it. https://github.com/echasnovski/mini.doc"
+  return
+end
+
+local files = {
+  "lua/gopher/init.lua",
+  "lua/gopher/config.lua",
+  "plugin/gopher.lua",
+  "lua/gopher/struct_tags.lua",
+  "lua/gopher/json2go.lua",
+  "lua/gopher/impl.lua",
+  "lua/gopher/gotests.lua",
+  "lua/gopher/iferr.lua",
+  "lua/gopher/comment.lua",
+}
+
+minidoc.setup()
+
+local hooks = vim.deepcopy(minidoc.default_hooks)
+hooks.write_pre = function(lines)
+  -- Remove first two lines with `======` and `------` delimiters to comply
+  -- with `:h local-additions` template
+  table.remove(lines, 1)
+  table.remove(lines, 1)
+
+  return lines
+end
+
+hooks.sections["@dochide"] = function(s)
+  s.parent:clear_lines()
+end
+
+MiniDoc.generate(files, "doc/gopher.nvim.txt", { hooks = hooks })

scripts/minimal_init.lua

@@ -0,0 +1,72 @@
+local function root(p)
+  local f = debug.getinfo(1, "S").source:sub(2)
+  return vim.fn.fnamemodify(f, ":p:h:h") .. "/" .. (p or "")
+end
+
+local function install_plug(plugin)
+  local name = plugin:match ".*/(.*)"
+  local package_root = root ".tests/site/pack/deps/start/"
+  if not vim.uv.fs_stat(package_root .. name) then
+    print("Installing " .. plugin)
+    vim
+      .system({
+        "git",
+        "clone",
+        "--depth=1",
+        "https://github.com/" .. plugin .. ".git",
+        package_root .. "/" .. name,
+      })
+      :wait()
+  end
+end
+
+install_plug "nvim-treesitter/nvim-treesitter"
+install_plug "echasnovski/mini.doc" -- used for docs generation
+install_plug "folke/tokyonight.nvim" -- theme for generating demos
+install_plug "echasnovski/mini.test"
+
+vim.env.XDG_CONFIG_HOME = root ".tests/config"
+vim.env.XDG_DATA_HOME = root ".tests/data"
+vim.env.XDG_STATE_HOME = root ".tests/state"
+vim.env.XDG_CACHE_HOME = root ".tests/cache"
+
+vim.opt.runtimepath:append(root())
+vim.opt.packpath:append(root ".tests/site")
+vim.o.swapfile = false
+vim.o.writebackup = false
+vim.notify = vim.print
+
+-- install go treesitter parse
+require("nvim-treesitter.install").ensure_installed_sync "go"
+
+require("gopher").setup {
+  log_level = vim.log.levels.OFF,
+  timeout = 4000,
+}
+
+-- setup mini.test only when running headless nvim
+if #vim.api.nvim_list_uis() == 0 then
+  require("mini.test").setup {
+    collect = {
+      find_files = function()
+        return vim.fn.globpath("spec", "**/*_test.lua", true, true)
+      end,
+    },
+  }
+end
+
+-- set colorscheme only when running ui
+if #vim.api.nvim_list_uis() == 1 then
+  vim.cmd.colorscheme "tokyonight-night"
+  vim.o.cursorline = true
+  vim.o.number = true
+end
+
+-- needed for tests, i dont know the reason why, but on start
+-- vim is not able to use treesitter for go by default
+vim.api.nvim_create_autocmd("FileType", {
+  pattern = "go",
+  callback = function(args)
+    vim.treesitter.start(args.buf, "go")
+  end,
+})

selene.toml

@@ -1 +1,2 @@
-std="nvim+lua51"
+std = "nvim+lua52"
+exclude = [".tests/*"]

spec/fixtures/comment/empty_output.go

@@ -0,0 +1,2 @@
+// 
+

spec/fixtures/comment/func_input.go

@@ -0,0 +1,5 @@
+package main
+
+func Test(a int) bool {
+	return false
+}

spec/fixtures/comment/func_output.go

@@ -0,0 +1,6 @@
+package main
+
+// Test 
+func Test(a int) bool {
+	return false
+}

spec/fixtures/comment/interface_input.go

@@ -0,0 +1,3 @@
+package main
+
+type Testinger interface{}

spec/fixtures/comment/interface_many_method_input.go

@@ -0,0 +1,6 @@
+package main
+
+type Testinger interface {
+	Get(id string) int
+	Set(id string, val int)
+}

spec/fixtures/comment/interface_many_method_output.go

@@ -0,0 +1,7 @@
+package main
+
+type Testinger interface {
+	Get(id string) int
+	// Set 
+	Set(id string, val int)
+}

spec/fixtures/comment/interface_method_input.go

@@ -0,0 +1,5 @@
+package main
+
+type Testinger interface {
+	Method(input string) error
+}

spec/fixtures/comment/interface_method_output.go

@@ -0,0 +1,6 @@
+package main
+
+type Testinger interface {
+	// Method 
+	Method(input string) error
+}

spec/fixtures/comment/interface_output.go

@@ -0,0 +1,4 @@
+package main
+
+// Testinger 
+type Testinger interface{}

spec/fixtures/comment/many_structs_fields_input.go

@@ -0,0 +1,18 @@
+package main
+
+type (
+	TestOne struct {
+		Asdf string
+		ID   int
+	}
+
+	TestTwo struct {
+		Fesa int
+		A    bool
+	}
+
+	TestThree struct {
+		Asufj int
+		Fs    string
+	}
+)

spec/fixtures/comment/many_structs_fields_output.go

@@ -0,0 +1,19 @@
+package main
+
+type (
+	TestOne struct {
+		Asdf string
+		ID   int
+	}
+
+	TestTwo struct {
+		// Fesa 
+		Fesa int
+		A    bool
+	}
+
+	TestThree struct {
+		Asufj int
+		Fs    string
+	}
+)

spec/fixtures/comment/method_input.go

@@ -0,0 +1,7 @@
+package main
+
+type Method struct{}
+
+func (Method) Run() error {
+	return nil
+}

spec/fixtures/comment/method_output.go

@@ -0,0 +1,8 @@
+package main
+
+type Method struct{}
+
+// Run 
+func (Method) Run() error {
+	return nil
+}

spec/fixtures/comment/package_input.go

@@ -0,0 +1 @@
+package main

spec/fixtures/comment/package_output.go

@@ -0,0 +1,2 @@
+// Package main provides 
+package main

spec/fixtures/comment/struct_fields_input.go

@@ -0,0 +1,7 @@
+package main
+
+type CommentStruct struct {
+	Name    string
+	Address string
+	Aliases []string
+}

spec/fixtures/comment/struct_fields_output.go

@@ -0,0 +1,8 @@
+package main
+
+type CommentStruct struct {
+	Name    string
+	// Address 
+	Address string
+	Aliases []string
+}

spec/fixtures/comment/struct_input.go

@@ -0,0 +1,3 @@
+package main
+
+type CommentStruct struct{}

spec/fixtures/comment/struct_output.go

@@ -0,0 +1,4 @@
+package main
+
+// CommentStruct 
+type CommentStruct struct{}

spec/fixtures/comment/svar_input.go

@@ -0,0 +1,5 @@
+package main
+
+func varTest() {
+	s := "something"
+}

spec/fixtures/comment/svar_output.go

@@ -0,0 +1,6 @@
+package main
+
+func varTest() {
+	// s 
+	s := "something"
+}

spec/fixtures/comment/var_input.go

@@ -0,0 +1,5 @@
+package main
+
+func test() {
+	var imAVar string
+}

spec/fixtures/comment/var_output.go

@@ -0,0 +1,6 @@
+package main
+
+func test() {
+	// imAVar 
+	var imAVar string
+}

spec/fixtures/comment/var_struct_fields_input.go

@@ -0,0 +1,8 @@
+package main
+
+func main() {
+	var s struct {
+		API string
+		Key string
+	}
+}

spec/fixtures/comment/var_struct_fields_output.go

@@ -0,0 +1,9 @@
+package main
+
+func main() {
+	var s struct {
+		API string
+		// Key 
+		Key string
+	}
+}

spec/fixtures/iferr/iferr_input.go

@@ -0,0 +1,9 @@
+package main
+
+func test() error {
+	return nil
+}
+
+func main() {
+	err := test()
+}

spec/fixtures/iferr/iferr_output.go

@@ -0,0 +1,12 @@
+package main
+
+func test() error {
+	return nil
+}
+
+func main() {
+	err := test()
+	if err != nil {
+		return
+	}
+}

spec/fixtures/iferr/message_input.go

@@ -0,0 +1,7 @@
+package main
+
+func getErr() error { return nil }
+
+func test() error {
+	err := getErr()
+}

spec/fixtures/iferr/message_output.go

@@ -0,0 +1,10 @@
+package main
+
+func getErr() error { return nil }
+
+func test() error {
+	err := getErr()
+	if err != nil {
+		return fmt.Errorf("failed to %w", err)
+	}
+}

spec/fixtures/impl/closer_input.go

@@ -0,0 +1,3 @@
+package main
+
+type CloserTest struct{}

spec/fixtures/impl/closer_output.go

@@ -0,0 +1,7 @@
+package main
+
+type CloserTest2 struct{}
+
+func (closertest *CloserTest2) Close() error {
+	panic("not implemented") // TODO: Implement
+}

spec/fixtures/impl/reader_input.go

@@ -0,0 +1,3 @@
+package main
+
+type Read struct{}

spec/fixtures/impl/reader_output.go

@@ -0,0 +1,7 @@
+package main
+
+func (r *Read2) Read(p []byte) (n int, err error) {
+	panic("not implemented") // TODO: Implement
+}
+
+type Read2 struct{}

spec/fixtures/impl/writer_input.go

@@ -0,0 +1,3 @@
+package main
+
+type WriterTest struct{}

spec/fixtures/impl/writer_output.go

@@ -0,0 +1,7 @@
+package main
+
+type WriterTest2 struct{}
+
+func (w *WriterTest2) Write(p []byte) (n int, err error) {
+	panic("not implemented") // TODO: Implement
+}

spec/fixtures/json2go/interativly_input.go

@@ -0,0 +1,2 @@
+package main
+

spec/fixtures/json2go/interativly_output.go

@@ -0,0 +1,5 @@
+package main
+
+type AutoGenerated struct {
+	Json bool `json:"json"`
+}

spec/fixtures/json2go/manual_input.go

@@ -0,0 +1,2 @@
+package main
+

spec/fixtures/json2go/manual_output.go

@@ -0,0 +1,7 @@
+package main
+
+type AutoGenerated struct {
+	User struct {
+		Name string `json:"name"`
+	} `json:"user"`
+}

spec/fixtures/tags/add_many_input.go

@@ -0,0 +1,11 @@
+package main
+
+type Test struct {
+	ID      int
+	Name    string
+	Num     int64
+	Another struct {
+		First  int
+		Second string
+	}
+}

spec/fixtures/tags/add_many_output.go

@@ -0,0 +1,11 @@
+package main
+
+type Test struct {
+	ID      int    `test4:"id" test5:"id" test1:"id" test2:"id"`
+	Name    string `test4:"name" test5:"name" test1:"name" test2:"name"`
+	Num     int64  `test4:"num" test5:"num" test1:"num" test2:"num"`
+	Another struct {
+		First  int    `test4:"first" test5:"first" test1:"first" test2:"first"`
+		Second string `test4:"second" test5:"second" test1:"second" test2:"second"`
+	} `test4:"another" test5:"another" test1:"another" test2:"another"`
+}

spec/fixtures/tags/add_range_input.go

@@ -0,0 +1,14 @@
+package main
+
+type Test struct {
+	ID      int
+	Name    string
+	Num     int64
+	Cost    int
+	Thingy  []string
+	Testing int
+	Another struct {
+		First  int
+		Second string
+	}
+}

spec/fixtures/tags/add_range_output.go

@@ -0,0 +1,14 @@
+package main
+
+type Test struct {
+	ID      int
+	Name    string `gopher:"name"`
+	Num     int64  `gopher:"num"`
+	Cost    int    `gopher:"cost"`
+	Thingy  []string
+	Testing int
+	Another struct {
+		First  int
+		Second string
+	}
+}

spec/fixtures/tags/clear_input.go

@@ -0,0 +1,11 @@
+package main
+
+type Test struct {
+	ID      int    `json:"id"      yaml:"id"      xml:"id"      db:"id"`
+	Name    string `json:"name"    yaml:"name"    xml:"name"    db:"name"`
+	Num     int64  `json:"num"     yaml:"num"     xml:"num"     db:"num"`
+	Another struct {
+		First  int    `json:"first" yaml:"first" xml:"first" db:"first"`
+		Second string `json:"second" yaml:"second" xml:"second" db:"second"`
+	} `json:"another" yaml:"another" xml:"another" db:"another"`
+}

spec/fixtures/tags/clear_output.go

@@ -0,0 +1,11 @@
+package main
+
+type Test struct {
+	ID      int
+	Name    string
+	Num     int64
+	Another struct {
+		First  int
+		Second string
+	}
+}

spec/fixtures/tags/many_input.go

@@ -0,0 +1,18 @@
+package main
+
+type (
+	TestOne struct {
+		Asdf string
+		ID   int
+	}
+
+	TestTwo struct {
+		Fesa int
+		A    bool
+	}
+
+	TestThree struct {
+		Asufj int
+		Fs    string
+	}
+)

spec/fixtures/tags/many_output.go

@@ -0,0 +1,18 @@
+package main
+
+type (
+	TestOne struct {
+		Asdf string
+		ID   int
+	}
+
+	TestTwo struct {
+		Fesa int  `testing:"fesa"`
+		A    bool `testing:"a"`
+	}
+
+	TestThree struct {
+		Asufj int
+		Fs    string
+	}
+)

spec/fixtures/tags/overwrite_default_option_input.go

@@ -0,0 +1,8 @@
+package main
+
+type Test struct {
+	ID      int
+	Another struct {
+		Second string
+	}
+}

spec/fixtures/tags/overwrite_default_option_output.go

@@ -0,0 +1,8 @@
+package main
+
+type Test struct {
+	ID      int `xml:"id,otheroption"`
+	Another struct {
+		Second string `xml:"second,otheroption"`
+	} `xml:"another,otheroption"`
+}

spec/fixtures/tags/remove_range_input.go

@@ -0,0 +1,14 @@
+package main
+
+type Test struct {
+	ID      int      `asdf:"id"`
+	Name    string   `asdf:"name"`
+	Num     int64    `asdf:"num"`
+	Cost    int      `asdf:"cost"`
+	Thingy  []string `asdf:"thingy"`
+	Testing int      `asdf:"testing"`
+	Another struct {
+		First  int    `asdf:"first"`
+		Second string `asdf:"second"`
+	} `asdf:"another"`
+}

spec/fixtures/tags/remove_range_output.go

@@ -0,0 +1,14 @@
+package main
+
+type Test struct {
+	ID      int      `asdf:"id"`
+	Name    string   `asdf:"name"`
+	Num     int64
+	Cost    int
+	Thingy  []string
+	Testing int      `asdf:"testing"`
+	Another struct {
+		First  int    `asdf:"first"`
+		Second string `asdf:"second"`
+	} `asdf:"another"`
+}

spec/fixtures/tags/remove_with_option_input.go

@@ -0,0 +1,11 @@
+package main
+
+type Test struct {
+	ID      int    `json:"id,omitempty" xml:"id,someoption"`
+	Name    string `json:"name,omitempty" xml:"name,someoption"`
+	Num     int64  `json:"num,omitempty" xml:"num,someoption"`
+	Another struct {
+		First  int    `json:"first,omitempty" xml:"first,someoption"`
+		Second string `json:"second,omitempty" xml:"second,someoption"`
+	} `json:"another,omitempty" xml:"another,someoption"`
+}

spec/fixtures/tags/remove_with_option_output.go

@@ -0,0 +1,11 @@
+package main
+
+type Test struct {
+	ID      int    `xml:"id,someoption"`
+	Name    string `xml:"name,someoption"`
+	Num     int64  `xml:"num,someoption"`
+	Another struct {
+		First  int    `xml:"first,someoption"`
+		Second string `xml:"second,someoption"`
+	} `xml:"another,someoption"`
+}

spec/fixtures/tags/svar_input.go

@@ -0,0 +1,11 @@
+package main
+
+func main() {
+	s := struct {
+		API string
+		Key string
+	}{
+		API: "api.com",
+		Key: "key",
+	}
+}

spec/fixtures/tags/svar_output.go

@@ -0,0 +1,11 @@
+package main
+
+func main() {
+	s := struct {
+		API string `xml:"api"`
+		Key string `xml:"key"`
+	}{
+		API: "api.com",
+		Key: "key",
+	}
+}

spec/fixtures/tags/var_input.go

@@ -0,0 +1,8 @@
+package main
+
+func main() {
+	var a struct {
+		TestField1 string
+		TestField2 string
+	}
+}

spec/fixtures/tags/var_output.go

@@ -0,0 +1,8 @@
+package main
+
+func main() {
+	var a struct {
+		TestField1 string `yaml:"test_field_1"`
+		TestField2 string `yaml:"test_field_2"`
+	}
+}

spec/fixtures/tags/with_default_option_input.go

@@ -0,0 +1,8 @@
+package main
+
+type Test struct {
+	ID      int
+	Another struct {
+		Second string
+	}
+}