Show system info in 'version -v'.

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

Author: skygragon

lib/commands/version.js

@@ -1,4 +1,5 @@
 var log = require('loglevel');
+var sprintf = require('sprintf-js').sprintf;
 
 var cmd = {
   command: 'version',
@@ -7,6 +8,10 @@ var cmd = {
   }
 };
 
+function prettyLine(k, v) {
+  log.info(sprintf('%-20s %s', k + ':', v));
+}
+
 cmd.handler = function(argv) {
   var version = require('../../package.json').version;
   if (log.getLevel() >= log.levels.INFO) {
@@ -24,15 +29,18 @@ cmd.handler = function(argv) {
   log.info(logo);
 
   var h = require('../helper');
+  var os = require('os');
+  var config = require('../config');
+
   log.info('\n[Environment]');
-  log.info('Cache: ', h.getCacheDir());
-  log.info('Config:', h.getConfigFile());
+  prettyLine('Node', process.version);
+  prettyLine('OS', os.platform() + ' ' + os.release());
+  prettyLine('Cache', h.getCacheDir());
+  prettyLine('Config', h.getConfigFile());
 
-  var config = require('../config');
-  var sprintf = require('sprintf-js').sprintf;
   log.info('\n[Configuration]');
   Object.getOwnPropertyNames(config).sort().forEach(function(k) {
-    log.info(sprintf('%-16s %s', k + ':', config[k]));
+    prettyLine(k, config[k]);
   });
 };