feat: add logger (#64)

* refactor(health): keep in mind new way of health check (#63)

* feat(log): add logger module

* refactor(utils): remove unused code

* refactor(log, utils): get plugin name from config

* refactor(logger): add some type annotations

* refactor(utils): log notifications

* feat: LOGGER™

* feat(config): TYPES

* refactor(log): dont give a thing about var that is not even declared

* feat(log): add easy way to open log

* refactor(log): some types

* update types

* docs: regen

* fix(log): make setting log level by config work

* feat(iferr): write error to log file if occur

* feat(gotests): add logger

lua/gopher/_utils/log.lua

@@ -0,0 +1,170 @@
+-- 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
+  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 doesnt 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