refactor to allow --link flag to create symlinked config file; issue …

…#248

bin/cmd.js

@@ -1,6 +1,7 @@
 #!/usr/bin/env node
 'use strict';
 
+var exec = require('child_process').exec;
 var path = require('path');
 var eslint = require('eslint');
 var parse = require('minimist');
@@ -11,21 +12,50 @@ var cli, report;
 var args = parse(process.argv.slice(2));
 var dir = args._.slice(0, 1);
 
-var shouldFix = args.hasOwnProperty('fix');
+/*
+ * Symlinks the eslintrc file into the dependent project's root
+ */
+function createSymLink () {
+  var fullpath = path.resolve(dir[0]);
+
+  exec(
+    'ln -sf ' + configFilePath + ' ' + path.join(fullpath, '.eslintrc.js'),
+    function (err) {
+      if (err) {
+        console.error('Error encountered when trying to create symlink', err); // eslint-disable-line
+      }
+
+      console.log('Successfully symlinked .eslintrc.js to ' + fullpath); // eslint-disable-line
+    }
+  );
+}
 
-cli = new eslint.CLIEngine({ configFile: configFilePath, fix: shouldFix });
+/*
+ * Lints the directory passed in as a command line argument
+ */
+function lintDirectory () {
+  var shouldFix = args.hasOwnProperty('fix');
 
-report = cli.executeOnFiles(dir);
+  cli = new eslint.CLIEngine({ configFile: configFilePath, fix: shouldFix });
 
-if (shouldFix) {
-  eslint.CLIEngine.outputFixes(report);
-}
+  report = cli.executeOnFiles(dir);
+
+  if (shouldFix) {
+    eslint.CLIEngine.outputFixes(report);
+  }
 
-console.log(cli.getFormatter()(report.results)); // eslint-disable-line
+  console.log(cli.getFormatter()(report.results)); // eslint-disable-line
+
+  // End with exit code 1 if there are errors
+  // Use process.exit instead of throwing to mimic the behaviour of eslints bin
+  // We don't want a stacktrace, it would just be confusing
+  if (report.errorCount) {
+      process.exit(1); // eslint-disable-line
+  }
+}
 
-// End with exit code 1 if there are errors
-// Use process.exit instead of throwing to mimic the behaviour of eslints bin
-// We don't want a stacktrace, it would just be confusing
-if (report.errorCount) {
-    process.exit(1); // eslint-disable-line
+if (args.hasOwnProperty('link')) {
+  createSymLink();
+} else {
+  lintDirectory();
 }