Add add command to list assigned roles [#28]

Original commits:
* initial commit
* only admins can list roles + auth-test fix?
* indentation issue?
* No roles have been assigned reply
* cleanup
* removal of comments
* moved command to bottom of file

Author: zGrav

src/auth.coffee

@@ -10,6 +10,7 @@
 #   hubot what roles does <user> have - Find out what roles a user has
 #   hubot what roles do I have - Find out what roles you have
 #   hubot who has <role> role - Find out who has the given role
+#   hubot list assigned roles - List all roles and users assigned to them
 #
 # Notes:
 #   * Call the method: robot.auth.hasRole(msg.envelope.user,'<role>')
@@ -64,6 +65,7 @@ module.exports = (robot) ->
 
   robot.auth = new Auth
 
+
   robot.respond /@?([^\s]+) ha(?:s|ve) (["'\w: -_]+) role/i, (msg) ->
     name = msg.match[1].trim()
     if name.toLowerCase() is 'i' then name = msg.message.user.name
@@ -129,3 +131,15 @@ module.exports = (robot) ->
       msg.reply "The following people have the '#{role}' role: #{userNames.join(', ')}"
     else
       msg.reply "There are no people that have the '#{role}' role."
+
+  robot.respond /list assigned roles/i, (msg) ->
+    roles = []
+    unless robot.auth.isAdmin msg.message.user
+        msg.reply "Sorry, only admins can list assigned roles."
+    else
+        for i, user of robot.brain.data.users when user.roles
+            roles.push role for role in user.roles when role not in roles
+        if roles.length > 0
+            msg.reply "The following roles are available: #{roles.join(', ')}"
+        else
+            msg.reply "No roles to list."

test/auth-test.coffee

@@ -121,3 +121,18 @@ describe 'auth', ->
       done()
 
     adapter.receive(new TextMessage anon_user, "hubot: what roles does admin-user have?")
+
+  it 'successfully list assigned roles', (done) ->
+      adapter.receive(new TextMessage admin_user, "hubot: admin-user has demo role")
+      adapter.receive(new TextMessage admin_user, "hubot: anon-user has test role")
+      adapter.receive(new TextMessage admin_user, "hubot: admin-user has test role")
+
+      adapter.on "reply", (envelope, strings) ->
+          if strings[0].match /OK, .* has .* role/i
+              return
+
+
+          expect(strings[0]).to.match(/following roles .*:.*demo.*test/)
+          done()
+
+      adapter.receive(new TextMessage admin_user, "hubot: list assigned roles")