userName -> persona filter and parameterization

Make the userName filter more useful by expanding it to a general
parameterized persona filter.

h/js/directives.coffee

@@ -316,7 +316,7 @@ username = ['$filter', '$window', ($filter, $window) ->
     return unless ctrl?
 
     ctrl.$render = ->
-      scope.uname = ($filter 'userName') ctrl.$viewValue
+      scope.uname = ($filter 'persona') ctrl.$viewValue
 
     scope.uclick = (event) ->
       event.stopPropagation()

h/js/filters.coffee

@@ -40,8 +40,9 @@ fuzzyTime = (date) ->
     fuzzy = Math.round(delta / year) + ' years ago'
   fuzzy
 
-userName = (user) ->
-  (user?.match /^acct:([^@]+)/)?[1]
+persona = (user, part='username') ->
+  part = ['term', 'username', 'provider'].indexOf(part)
+  (user?.match /^acct:([^@]+)@(.+)/)?[part]
 
 elide = (text, split_length) ->
   if text.length > split_length
@@ -53,5 +54,5 @@ elide = (text, split_length) ->
 angular.module('h.filters', [])
   .filter('converter', -> (new Converter()).makeHtml)
   .filter('fuzzyTime', -> fuzzyTime)
-  .filter('userName', -> userName)
+  .filter('persona', -> persona)
   .filter('elide', -> elide)

h/js/services.coffee

@@ -705,7 +705,7 @@ class ViewFilter
 
   this.$inject = ['$filter']
   constructor: ($filter) ->
-    @user_filter = $filter('userName')
+    @user_filter = $filter('persona')
 
   # Filters a set of annotations, according to a given query.
   #
@@ -747,8 +747,8 @@ class ViewFilter
       for category, value of query
         switch category
           when 'user'
-            userName = @user_filter annotation.user
-            unless userName?.toLowerCase() is value
+            username = @user_filter annotation.user
+            unless username?.toLowerCase() is value
               matches = false
               break
           when 'text'