feat: first working version

1 files changed, 108 insertions, 0 deletions

diff --git a/lua/conform/log.lua b/lua/conform/log.lua
new file mode 100644
index 0000000..b42d1f8
--- /dev/null
+++ b/lua/conform/log.lua
@@ -0,0 +1,108 @@
+local uv = vim.uv or vim.loop
+local levels = vim.deepcopy(vim.log.levels)
+vim.tbl_add_reverse_lookup(levels)
+
+local Log = {}
+
+---@type integer
+Log.level = vim.log.levels.ERROR
+
+---@return string
+Log.get_logfile = function()
+  local fs = require("conform.fs")
+
+  local ok, stdpath = pcall(vim.fn.stdpath, "log")
+  if not ok then
+    stdpath = vim.fn.stdpath("cache")
+  end
+  return fs.join(stdpath, "conform.log")
+end
+
+---@param level integer
+---@param msg string
+---@param ... any[]
+---@return string
+local function format(level, msg, ...)
+  local args = vim.F.pack_len(...)
+  for i = 1, args.n do
+    local v = args[i]
+    if type(v) == "table" then
+      args[i] = vim.inspect(v)
+    elseif v == nil then
+      args[i] = "nil"
+    end
+  end
+  local ok, text = pcall(string.format, msg, vim.F.unpack_len(args))
+  if ok then
+    local str_level = levels[level]
+    return string.format("[%s] %s", str_level, text)
+  else
+    return string.format("[ERROR] error formatting log line: '%s' args %s", msg, vim.inspect(args))
+  end
+end
+
+---@param line string
+local function write(line)
+  -- This will be replaced during initialization
+end
+
+local initialized = false
+local function initialize()
+  if initialized then
+    return
+  end
+  initialized = true
+  local filepath = Log.get_logfile()
+
+  local stat = uv.fs_stat(filepath)
+  if stat and stat.size > 10 * 1024 * 1024 then
+    local backup = filepath .. ".1"
+    uv.fs_unlink(backup)
+    uv.fs_rename(filepath, backup)
+  end
+
+  local parent = vim.fs.dirname(filepath)
+  vim.fn.mkdir(parent, "p")
+
+  local logfile, openerr = io.open(filepath, "a+")
+  if not logfile then
+    local err_msg = string.format("Failed to open conform.nvim log file: %s", openerr)
+    vim.notify(err_msg, vim.log.levels.ERROR)
+  else
+    write = function(line)
+      logfile:write(line)
+      logfile:write("\n")
+      logfile:flush()
+    end
+  end
+end
+
+function Log.log(level, msg, ...)
+  if Log.level <= level then
+    initialize()
+    local text = format(level, msg, ...)
+    write(text)
+  end
+end
+
+function Log.trace(...)
+  Log.log(vim.log.levels.TRACE, ...)
+end
+
+function Log.debug(...)
+  Log.log(vim.log.levels.DEBUG, ...)
+end
+
+function Log.info(...)
+  Log.log(vim.log.levels.INFO, ...)
+end
+
+function Log.warn(...)
+  Log.log(vim.log.levels.WARN, ...)
+end
+
+function Log.error(...)
+  Log.log(vim.log.levels.ERROR, ...)
+end
+
+return Log