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-- Logger for language client plugin.
local log = {}
-- Log level dictionary with reverse lookup as well.
--
-- Can be used to lookup the number from the name or the name from the number.
-- Levels by name: 'trace', 'debug', 'info', 'warn', 'error'
-- Level numbers begin with 'trace' at 0
log.levels = {
TRACE = 0;
DEBUG = 1;
INFO = 2;
WARN = 3;
ERROR = 4;
}
-- Default log level is warn.
local current_log_level = log.levels.WARN
local log_date_format = "%FT%H:%M:%S%z"
do
local path_sep = vim.loop.os_uname().sysname == "Windows" and "\\" or "/"
local function path_join(...)
return table.concat(vim.tbl_flatten{...}, path_sep)
end
local logfilename = path_join(vim.fn.stdpath('data'), 'vim-lsp.log')
--- Return the log filename.
function log.get_filename()
return logfilename
end
vim.fn.mkdir(vim.fn.stdpath('data'), "p")
local logfile = assert(io.open(logfilename, "a+"))
for level, levelnr in pairs(log.levels) do
-- Also export the log level on the root object.
log[level] = levelnr
-- Set the lowercase name as the main use function.
-- If called without arguments, it will check whether the log level is
-- greater than or equal to this one. When called with arguments, it will
-- log at that level (if applicable, it is checked either way).
--
-- Recommended usage:
-- ```
-- local _ = log.warn() and log.warn("123")
-- ```
--
-- This way you can avoid string allocations if the log level isn't high enough.
log[level:lower()] = function(...)
local argc = select("#", ...)
if levelnr < current_log_level then return false end
if argc == 0 then return true end
local info = debug.getinfo(2, "Sl")
local fileinfo = string.format("%s:%s", info.short_src, info.currentline)
local parts = { table.concat({"[", level, "]", os.date(log_date_format), "]", fileinfo, "]"}, " ") }
for i = 1, argc do
local arg = select(i, ...)
if arg == nil then
table.insert(parts, "nil")
else
table.insert(parts, vim.inspect(arg, {newline=''}))
end
end
logfile:write(table.concat(parts, '\t'), "\n")
logfile:flush()
end
end
-- Add some space to make it easier to distinguish different neovim runs.
logfile:write("\n")
end
-- This is put here on purpose after the loop above so that it doesn't
-- interfere with iterating the levels
vim.tbl_add_reverse_lookup(log.levels)
function log.set_level(level)
if type(level) == 'string' then
current_log_level = assert(log.levels[level:upper()], string.format("Invalid log level: %q", level))
else
assert(type(level) == 'number', "level must be a number or string")
assert(log.levels[level], string.format("Invalid log level: %d", level))
current_log_level = level
end
end
-- Return whether the level is sufficient for logging.
-- @param level number log level
function log.should_log(level)
return level >= current_log_level
end
return log
-- vim:sw=2 ts=2 et
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