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var is = require('is');
var util = require('util');
var color = require('bash-color');
var Immutable = require('immutable');
var LEVELS = Immutable.Map({
DEBUG: 0,
INFO: 1,
WARN: 2,
ERROR: 3,
DISABLED: 10
});
var COLORS = Immutable.Map({
DEBUG: color.purple,
INFO: color.cyan,
WARN: color.yellow,
ERROR: color.red
});
function Logger(write, logLevel) {
if (!(this instanceof Logger)) return new Logger(write, logLevel);
this._write = write || function(msg) {
if(process.stdout) {
process.stdout.write(msg);
}
};
this.lastChar = '\n';
this.setLevel(logLevel || 'info');
// Create easy-to-use method like "logger.debug.ln('....')"
LEVELS.forEach(function(level, levelKey) {
if (levelKey === 'DISABLED') {
return;
}
levelKey = levelKey.toLowerCase();
this[levelKey] = this.log.bind(this, level);
this[levelKey].ln = this.logLn.bind(this, level);
this[levelKey].ok = this.ok.bind(this, level);
this[levelKey].fail = this.fail.bind(this, level);
this[levelKey].promise = this.promise.bind(this, level);
}, this);
}
/**
Change minimum level
@param {String} logLevel
*/
Logger.prototype.setLevel = function(logLevel) {
if (is.string(logLevel)) {
logLevel = logLevel.toUpperCase();
logLevel = LEVELS.get(logLevel);
}
this.logLevel = logLevel;
};
/**
Return minimum logging level
@return {Number}
*/
Logger.prototype.getLevel = function(logLevel) {
return this.logLevel;
};
/**
Print a simple string
@param {String}
*/
Logger.prototype.write = function(msg) {
msg = msg.toString();
this.lastChar = msg[msg.length - 1];
return this._write(msg);
};
/**
Format a string using the first argument as a printf-like format.
*/
Logger.prototype.format = function() {
return util.format.apply(util, arguments);
};
/**
Print a line
@param {String}
*/
Logger.prototype.writeLn = function(msg) {
return this.write((msg || '')+'\n');
};
/**
Log/Print a message if level is allowed
@param {Number} level
*/
Logger.prototype.log = function(level) {
if (level < this.logLevel) return;
var levelKey = LEVELS.findKey(function(v) {
return v === level;
});
var args = Array.prototype.slice.apply(arguments, [1]);
var msg = this.format.apply(this, args);
if (this.lastChar == '\n') {
msg = COLORS.get(levelKey)(levelKey.toLowerCase()+':')+' '+msg;
}
return this.write(msg);
};
/**
Log/Print a line if level is allowed
*/
Logger.prototype.logLn = function() {
if (this.lastChar != '\n') this.write('\n');
var args = Array.prototype.slice.apply(arguments);
args.push('\n');
return this.log.apply(this, args);
};
/**
Log a confirmation [OK]
*/
Logger.prototype.ok = function(level) {
var args = Array.prototype.slice.apply(arguments, [1]);
var msg = this.format.apply(this, args);
if (arguments.length > 1) {
this.logLn(level, color.green('>> ') + msg.trim().replace(/\n/g, color.green('\n>> ')));
} else {
this.log(level, color.green('OK'), '\n');
}
};
/**
Log a "FAIL"
*/
Logger.prototype.fail = function(level) {
return this.log(level, color.red('ERROR') + '\n');
};
/**
Log state of a promise
@param {Number} level
@param {Promise}
@return {Promise}
*/
Logger.prototype.promise = function(level, p) {
var that = this;
return p.
then(function(st) {
that.ok(level);
return st;
}, function(err) {
that.fail(level);
throw err;
});
};
Logger.LEVELS = LEVELS;
module.exports = Logger;
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