sCCripts/jlib/log.lua

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2020-12-28 14:45:50 +01:00
-- Created by Jef Roosens
--
-- Module to add logging to a program. This module is integrated in all jlib
-- functions.
local module = {}
-- Define class with default values
local Logger = {
level = 2,
level_colors = {
colors.red, colors.orange, colors.yellow, colors.blue, colors.white},
prefixes = { "CRIT", "ERROR", "WARN", "INFO", "DEBUG" },
filename = nil
}
Logger.__index = Logger
-- Return a new logger 'object'.
--
-- @param level log level:
-- (0) critical, (1) errors, (2) warnings, (3) info,(4) debug
-- @param level_colors table containing color names for messages; order is
-- { critical, errors, warnings, info, debug }. Only colors for the needed log
-- level need to be provided: e.g. if the log level is (2) warnings, then only
-- two colors need to be provided. If not provided, defaults to
-- { red, orange, yellow, blue, white }.
-- @param prefixes prefix to show for each log level
-- @param filename log file to write to. If not supplied, log will only be
-- outputted to stdout
-- @return a logger 'object'
function Logger:new(o)
o = o or {}
setmetatable(o, self)
-- Fill in default values where needed
-- TODO find out if this is needed or not
-- for k, v in pairs(Logger) do
-- o[k] = o[k] or Logger[k]
-- end
-- Open file handler
if o.filename then
o._file = open(filename, "a")
end
return o
end
-- Log a message with the given level
--
-- @param level log level; levels higher than logger level get discarded
-- @param message message to log
-- @return wether or not the message was actually logged
function Logger:log(level, message)
-- Exit if the level is too high
if level > self.level then return false end
-- Log to screen
local cur_color = term.getTextColor()
term.setTextColor(self.colors[level + 1])
term.write("[" .. self.prefixes[level + 1] .. "] ")
term.setTextColor(cur_color)
print(message)
-- Log to file
if self._file then
local line = "[" .. self.prefixes[level + 1] .. "] " .. message .. '\n'
self._file.write(line)
self._file.flush()
end
end
-- Just some convenience functions; wrappers around Logger:log
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function Logger:critical(message) self:log(0, message) end
function Logger:error(message) self:log(1, message) end
function Logger:warning(message) self:log(2, message) end
function Logger:info(message) self:log(3, message) end
function Logger:debug(message) self:log(4, message) end
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-- Close the logger a.k.a. close the log file handler
function Logger:close()
if self._file then self._file.close() end
end
module.Logger = Logger
return module