rind: Parse text entered in the track search entry

And set up a regex pattern that we can use to match tracks later.

Signed-off-by: Anna Schumaker <Anna@NoWheyCreamery.com>

emmental.ui

@@ -951,4 +951,20 @@ audio-volume-medium-symbolic</property>
       </object>
     </child>
   </object>
+  <object class="GtkPopover" id="track_regex_popover">
+    <property name="can_focus">False</property>
+    <property name="relative_to">track_search</property>
+    <property name="position">bottom</property>
+    <property name="modal">False</property>
+    <child>
+      <object class="GtkLabel" id="track_regex_error">
+        <property name="visible">True</property>
+        <property name="can_focus">False</property>
+        <property name="label" translatable="yes">label</property>
+      </object>
+    </child>
+    <style>
+      <class name="tooltip"/>
+    </style>
+  </object>
 </interface>

rind/playlist/test_view.py

@@ -5,6 +5,7 @@ from .. import audio
 from .. import gtk
 import curds
 import os
+import re
 import unittest
 from gi.repository import Gdk, GObject, Gtk, Gst
 
@@ -27,8 +28,11 @@ class TestPlaylistView(unittest.TestCase):
 
     def test_init(self):
         self.assertIsInstance(view.Entry,     Gtk.Entry)
+        self.assertIsInstance(view.Error,     Gtk.Label)
         self.assertIsInstance(view.Loop,      Gtk.ToggleButton)
         self.assertIsInstance(view.Model,     model.PlaylistModel)
+        self.assertIsInstance(view.Pattern,   re.Pattern)
+        self.assertIsInstance(view.Popover,   Gtk.Popover)
         self.assertIsInstance(view.Random,    Gtk.ToggleButton)
         self.assertIsInstance(view.TreeView,  Gtk.TreeView)
         self.assertIsInstance(view.Selection, Gtk.TreeSelection)
@@ -36,6 +40,7 @@ class TestPlaylistView(unittest.TestCase):
 
         view.reset()
         self.assertEqual(view.Model.playlist, curds.playlist.lookup("Collection"))
+        self.assertEqual(view.Pattern.pattern, "")
 
     def test_show_more_accel(self):
         signal = GObject.signal_lookup("grab-focus", Gtk.SearchEntry)
@@ -282,3 +287,18 @@ class TestPlaylistView(unittest.TestCase):
         view.TreeView.emit("button-press-event", event)
         for track in self.plist.list:
             self.assertNotIn(track, curds.playlist.UpNext.list)
+
+    def test_filter_error(self):
+        view.Entry.set_text("*v")
+        view.Entry.emit("search-changed")
+
+        self.assertTrue(view.Entry.get_style_context().has_class("warning"))
+        self.assertTrue(view.Popover.is_visible())
+        self.assertEqual(view.Error.get_text(), "Nothing to repeat at position 0")
+
+        view.Entry.set_text("")
+        view.Entry.emit("search-changed")
+        gtk.main_loop(iteration_delay=0.01)
+
+        self.assertFalse(view.Entry.get_style_context().has_class("warning"))
+        self.assertFalse(view.Popover.is_visible())

rind/playlist/view.py

@@ -3,11 +3,15 @@ from . import model
 from .. import audio
 from .. import gtk
 import curds
+import re
 from gi.repository import Gtk
 
 Entry     = gtk.Builder.get_object("track_search")
+Error     = gtk.Builder.get_object("track_regex_error")
 Loop      = gtk.Builder.get_object("loop_button")
 Model     = None
+Pattern   = re.compile("")
+Popover   = gtk.Builder.get_object("track_regex_popover")
 Random    = gtk.Builder.get_object("random_button")
 Runtime   = gtk.Builder.get_object("runtime")
 TreeView  = gtk.Builder.get_object("playlist_treeview")
@@ -76,6 +80,20 @@ for i, column in enumerate(TreeView.get_columns()):
     column.connect("clicked", on_column_clicked, i)
 
 
+def on_search_changed(entry):
+    global Pattern
+    try:
+        Pattern = re.compile(entry.get_text(), re.I)
+        Entry.get_style_context().remove_class("warning")
+        Popover.popdown()
+    except re.error as e:
+        Entry.get_style_context().add_class("warning")
+        Error.set_text(str(e).capitalize())
+        Popover.popup()
+
+Entry.connect("search-changed", on_search_changed)
+
+
 def on_add_track(plist, track, index):
     if plist == Model.playlist:
         Model.row_inserted(Gtk.TreePath(0), Gtk.TreeIter())