[log unify] introduce loglevel

* '-v' to show debug log;
* '-vv' to show trace log.

Signed-off-by: Eric Wang <skygragon@gmail.com>

Author: skygragon

lib/cli.js

@@ -1,28 +1,45 @@
+var fs = require('fs');
+
+var chalk = require('chalk');
+var log = require('loglevel');
+
+var config = require('./config');
+var h = require('./helper');
+
 // We are expecting a tier configuration like:
 // global config < local config < cli params
 // Color is a tricky one so we manually handle it here.
 function setColorMode() {
-  var useColor = require('./config').USE_COLOR || false;
+  var useColor = config.USE_COLOR || false;
   if (process.argv.indexOf('--color') >= 0) useColor = true;
   if (process.argv.indexOf('--no-color') >= 0) useColor = false;
 
-  require('chalk').enabled = useColor;
+  chalk.enabled = useColor;
+}
+
+function setLogLevel() {
+  var level = log.levels.INFO;
+  if (process.argv.indexOf('-v') >= 0) level = log.levels.DEBUG;
+  if (process.argv.indexOf('-vv') >= 0) level = log.levels.TRACE;
+
+  log.setLevel(level);
 }
 
 function checkCache() {
-  var cacheDir = require('./helper').getCacheDir();
+  var cacheDir = h.getCacheDir();
 
-  var fs = require('fs');
   if (!fs.existsSync(cacheDir))
     fs.mkdirSync(cacheDir);
 }
 
 var cli = {};
 
 cli.run = function() {
-  require('./config').init();
+  config.init();
+
   checkCache();
   setColorMode();
+  setLogLevel();
 
   require('yargs')
     .commandDir('commands')

lib/commands/version.js

@@ -1,20 +1,16 @@
+var log = require('loglevel');
+
 var cmd = {
   command: 'version',
   desc:    'show version info',
   builder: {
-    verbose: {
-      alias:    'v',
-      type:     'boolean',
-      describe: 'More verbose info'
-    }
   }
 };
 
 cmd.handler = function(argv) {
   var version = require('../../package.json').version;
-
-  if (!argv.verbose) {
-    return console.log(version);
+  if (log.getLevel() >= log.levels.INFO) {
+    return log.info(version);
   }
 
   var logo = [
@@ -25,18 +21,18 @@ cmd.handler = function(argv) {
     '| |  __/  __/ |_  (__| (_) | (_| |  __/',
     '|_|\\___|\\___|\\__|\\___|\\___/ \\__,_|\\___|  CLI v' + version
   ].join('\n');
-  console.log(logo);
+  log.debug(logo);
 
   var h = require('../helper');
-  console.log('\n[Environment]');
-  console.log('Cache: ', h.getCacheDir());
-  console.log('Config:', h.getConfigFile());
+  log.debug('\n[Environment]');
+  log.debug('Cache: ', h.getCacheDir());
+  log.debug('Config:', h.getConfigFile());
 
   var config = require('../config');
   var sprintf = require('sprintf-js').sprintf;
-  console.log('\n[Configuration]');
+  log.debug('\n[Configuration]');
   Object.getOwnPropertyNames(config).sort().forEach(function(k) {
-    console.log(sprintf('%-16s %s', k + ':', config[k]));
+    log.debug(sprintf('%-16s %s', k + ':', config[k]));
   });
 };
 

package.json

@@ -32,6 +32,7 @@
   "dependencies": {
     "chalk": "^1.1.3",
     "cheerio": "^0.20.0",
+    "loglevel": "^1.4.1",
     "prompt": "^1.0.0",
     "request": "^2.74.0",
     "sprintf-js": "^1.0.3",