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