Add undo functionality (fixes #19)

README

@@ -12,6 +12,7 @@ Homepage: https://github.com/innir/gtranscribe
  - python3-gi
  - python3-dbus
  - gir1.2-gtk-3.0
+ - gir1.2-gtksource-3.0
  - gir1.2-glib-2.0
  - gir1.2-gspell-1
  - gir1.2-gstreamer-1.0

bin/gtranscribe

@@ -31,7 +31,9 @@ import dbus
 from dbus.mainloop.glib import DBusGMainLoop
 import gi
 gi.require_version('Gtk', '3.0')
-from gi.repository import GLib, Gtk, Gdk, GdkPixbuf
+from gi.repository import GLib, Gtk, Gdk, GdkPixbuf, GObject
+gi.require_version('GtkSource', '3.0')
+from gi.repository import GtkSource
 gi.require_version('Gspell', '1')
 from gi.repository import Gspell
 
@@ -52,7 +54,7 @@ locale.setlocale(locale.LC_ALL, '')
 gettext.textdomain('gTranscribe')
 DBusGMainLoop(set_as_default=True)
 
-
+# pylint: disable=invalid-name
 class gTranscribeWindow:
 
     def __init__(self, audiofile):
@@ -103,6 +105,7 @@ class gTranscribeWindow:
             GLib.idle_add(self.open_file, audiofile)
 
     def _init_ui(self):
+        GObject.type_register(GtkSource.View)
         builder = Gtk.Builder()
         builder.set_translation_domain('gTranscribe')
         builder.add_from_file(get_data_file(PROJECT_ROOT_DIRECTORY, 'ui',
@@ -385,7 +388,7 @@ class gTranscribeWindow:
                         self.text_buffer.get_iter_at_offset(line_start))
                     logger.debug('Set position')
 
-    # pylint: disable=unused-argument,no-self-use
+    # pylint: disable=unused-argument
     def on_scale_speed_format_value(self, widget, value, data=None):
         return f"{locale.format_string('%.1f', value)}\xd7"
 

data/ui/gTranscribe.glade

@@ -484,7 +484,7 @@ audio-volume-medium</property>
             <property name="vexpand">True</property>
             <property name="shadow_type">in</property>
             <child>
-              <object class="GtkTextView" id="text_view">
+              <object class="GtkSourceView" id="text_view">
                 <property name="visible">True</property>
                 <property name="can_focus">True</property>
                 <property name="has_focus">True</property>

gtranscribe/helpers.py

@@ -25,7 +25,7 @@
 from gi.repository import Gtk
 gettext.textdomain('gTranscribe')
 
-
+# pylint: disable=invalid-name
 class duration:
     """
     Stores a time duration in hours, minutes, seconds and microseconds.
@@ -86,7 +86,6 @@ def trim(timestring, digits=1):
         return timestring[:pos + 1 + digits]
     return timestring
 
-
 def ns_to_time(ns):
     """
     Convert nanoseconds to a duration object.

gtranscribe/player.py

@@ -22,7 +22,7 @@
 logger = logging.getLogger('player')
 Gst.init(None)
 
-
+# pylint: disable=invalid-name
 class gTranscribePlayer(Gst.Bin):
     """Class to play audio files with Gstreamer."""
 
@@ -39,7 +39,7 @@ def __init__(self):
 
         self._rate = 1
         self._duration = None
-        self._messageType = Gst.MessageType.UNKNOWN
+        self._message_type = Gst.MessageType.UNKNOWN
         self.init_pipeline()
 
     def init_pipeline(self):
@@ -91,7 +91,7 @@ def filename(self):
     def duration(self):
         """Return the duration of the current stream."""
         success = False
-        if self._duration is None or self._messageType == Gst.MessageType.DURATION_CHANGED:
+        if self._duration is None or self._message_type == Gst.MessageType.DURATION_CHANGED:
             success, self._duration = self.pipeline.query_duration(Gst.Format.TIME)
             if not success:
                 self._duration = 0
@@ -180,7 +180,7 @@ def on_new_decoded_pad(self, element, pad):
     # pylint: disable=unused-argument
     def on_message(self, bus, message):
         """Handle message and react accordingly."""
-        self._messageType = message.type
+        self._message_type = message.type
         if message.type == Gst.MessageType.EOS:
             self.state = Gst.State.NULL
             self.emit('ended')