groc.Logger

colors = require 'colors' CompatibilityHelpers = require './compatibility_helpers'

We have pretty simple needs for a logger, and so far have been unable to find a reasonable off-the-shelf solution that fits them without being too overbearing:

module.exports = class Logger

We want the standard levels of output, plus a few more.

LEVELS: TRACE: 0 DEBUG: 1 INFO: 2 PASS: 2 WARN: 3 ERROR: 4

Full on level: labels are extremely heavy for what is primarily a command-line tool. The common case - INFO - does not even expose a label. We only want it to call out uncommon events with some slight symbolism.

LEVEL_PREFIXES: TRACE: '∴ ' DEBUG: '‡ ' INFO: ' ' PASS: '✓ ' WARN: '» ' ERROR: '! '

Colors make the world better.

LEVEL_COLORS: TRACE: 'grey' DEBUG: 'grey' INFO: 'white' PASS: 'green' WARN: 'yellow' ERROR: 'red'

Don't forget the semantics of our output.

LEVEL_STREAMS: TRACE: console.log DEBUG: console.log INFO: console.log PASS: console.log WARN: console.error ERROR: console.error constructor: (minLevel = @LEVELS.INFO) -> @minLevel = minLevel for name of @LEVELS do (name) => @[name.toLowerCase()] = (args...) -> @emit name, args... emit: (levelName, args...) -> if @LEVELS[levelName] >= @minLevel output = CompatibilityHelpers.format args...

We like nicely indented output

output = output.split(/\r?\n/).join('\n ') @LEVEL_STREAMS[levelName] colors[@LEVEL_COLORS[levelName]] "#{@LEVEL_PREFIXES[levelName]}#{output}" output

Sometimes we just want one-off logging

globalLogger = new Logger Logger::LEVELS.TRACE for level of globalLogger.LEVELS do (level) -> Logger[level.toLowerCase()] = (args...) -> globalLogger[level.toLowerCase()] args...