Write LICENSE to the appDir during build task

build/tasks/build-task.coffee

@@ -74,7 +74,7 @@ module.exports = (grunt) ->
         unless /.+\.plist/.test(sourcePath)
           grunt.file.copy(sourcePath, path.resolve(appDir, '..', subDirectory, filename))
 
-    dependencies = ['compile']
+    dependencies = ['compile', "generate-license:save"]
     dependencies.push('copy-info-plist') if process.platform is 'darwin'
     dependencies.push('set-exe-icon') if process.platform is 'win32'
     grunt.task.run(dependencies...)

build/tasks/generate-license-task.coffee

@@ -1,6 +1,8 @@
+fs = require 'fs'
+path = require 'path'
 
 module.exports = (grunt) ->
-  grunt.registerTask 'generate-license', 'Generate the license, including the licenses of all dependencies', ->
+  grunt.registerTask 'generate-license', 'Generate the license, including the licenses of all dependencies', (mode) ->
     legalEagle = require 'legal-eagle'
     done = @async()
 
@@ -8,19 +10,30 @@ module.exports = (grunt) ->
       path: process.cwd()
       overrides: require './license-overrides'
 
-    legalEagle options, (err, summary) ->
+    legalEagle options, (err, dependencyLicenses) ->
       if err?
         console.error(err)
         exit 1
-      console.log getSummaryText(summary)
+
+      licenseText = getLicenseText(dependencyLicenses)
+      if mode is 'save'
+        targetPath = path.join(grunt.config.get('atom.appDir'), 'LICENSE')
+        fs.writeFileSync(targetPath, licenseText)
+      else
+        console.log licenseText
       done()
 
-getSummaryText = (summary) ->
+getLicenseText = (dependencyLicenses) ->
   {keys} = require 'underscore-plus'
-  text = ""
-  names = keys(summary).sort()
+  text = """
+    Copyright 2014 GitHub, Inc.
+
+    This application bundles the following third-party packages in accordance
+    with the following licenses:\n\n
+  """
+  names = keys(dependencyLicenses).sort()
   for name in names
-    {license, source, sourceText} = summary[name]
+    {license, source, sourceText} = dependencyLicenses[name]
 
     text += "-------------------------------------------------------------------------\n\n"
     text += "Package: #{name}\n"