gopher.nvim/lua/gopher/impl.lua(view raw)
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---@toc_entry Auto implementation of interface methods
---@tag gopher.nvim-impl
---@text impl is utilizing the `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 = {}
---@return string
---@private
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
u.notify "put cursor on a 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
function impl.impl(...)
local args = { ... }
local iface, recv_name = "", ""
local recv = get_struct()
if #args == 0 then
iface = vim.fn.input "impl: generating method stubs for interface: "
vim.cmd "redraw!"
if iface == "" then
u.deferred_notify("usage: GoImpl f *File io.Reader", vim.log.levels.INFO)
return
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
local rs = r.sync { c.impl, "-dir", vim.fn.fnameescape(vim.fn.expand "%:p:h"), recv, iface }
if rs.code ~= 0 then
error("failed to implement interface: " .. rs.stderr)
end
local pos = vim.fn.getcurpos()[2]
local output = u.remove_empty_lines(vim.split(rs.stdout, "\n"))
table.insert(output, 1, "")
vim.fn.append(pos, output)
end
return impl
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