cllc

Simple logger and counter for console

Install

npm install cllc

Usage

There is a logger and counter two-in-one. And log messages do not erase counter string. Perfect for work process indication in long-time scripts.

Logger

Logger output to console log string that consists of timestamp, log level label, logger tag and log message. Only timestamp is not optional.

var log = require('cllc')();

log('Sample message');

Timestamps

Timestamps are formatting by strftime. By default format string is '%T', but you can change it at any time. Like this:

log.dateFormat('%F %T');

Any string are correct, even if it doesn't contain any formatting symbols at all. But if parameter of log.dateFormat is not a string - nothing will change.

Log level labels

Default log level label is empty (nothing printed) but you can set default label or specify it explicitly for every log string.

log('log string with default log level label');
log.trace('log string with label <TRACE>'); //short form is log.t
log.debug('log string with label <DEBUG>'); //short form is log.d
log.info('log string with label <INFO>'); //short form is log.i
log.warn('log string with label <WARN>'); //short form is log.w
log.error('log string with label <ERROR>'); //short form is log.e

log.level('trace'); //set default log level label to <TRACE>
log.level('error'); //set default log level label to <ERROR>
log.level(); //set empty default log level label

Five log levels are possible: trace, debug, info, warn and error. Any other parameter in log.level sets empty default log level label.

Logger tags

Usually tags used if you want to identify several loggers from different modules or functions. Tag is just a short string. By default tag is empty, but you can specify it any time. Like this:

var log = require('cllc')('TAG1');
log('log string with tag "TAG1"');
log.tag('Tag2');
log('log string with tag "Tag2"');
log.tag();
log('log string with no tag');

You can use module variable on cllc init or as parameter of log.tag. In that case module filename and dir will be in tag.

var log = require('cllc')(module);
log('log string with something like "my-module/index" in tag');

Log messages

It's important, that log message is not required. cllc can output string with only timestamp (and label/tag if not empty). Also important, that cllc logger is not console.log so parameters is just concatenated (with toString and join(' ')). This logger is for easy and short messages.

log('This is a log message string', 'This is another log message string');
log(); //log string without message
log({a:1,b:2}); //log message will be '[object Object]'. Use strings.

Counter

Counter is a last string on console, where digital value in string are incrementing step by step. If counter are visible - log strings appears on second string from bottom.

// Start counter
log.start();
// //or//
// log.start('%s tasks done.', 0);
// //or//
// log.start('%s foo, %s bar, %s baz', 0, 1, 2);

// Increment counter
log.step();
// //or//
// log.step(5);
// //or//
// log.step(0, 0, 1);

// Safe logger
log('TEST');

// Stop counter
log.stop(); // stop and clear
// //or//
// log.finish(); // stop and save last string
// //or//
// log.finish('Well done %s tasks!', 100); // stop with special string
// //or//
// log.finish('%s foo, %s bar, %s baz', 100, 200, 300); // stop with special string

License

MIT

tolik555 / cllc