Make terminal compatible with Vte 0.38

Vte API has changed in multiple parts.
This patch check the methods available and make the code
compatible with the new and old versions of Vte.
For version >= 0.38 enable save the text in the terminal again,
because in my tests is working now.

terminal.py

@@ -55,6 +55,13 @@
 
 ZOOM_STEP = 1024
 
+VTE_VERSION = 0
+try:
+    VTE_VERSION = Vte.MINOR_VERSION
+except:
+    # version is not published in old versions of vte
+    pass
+
 
 class TerminalActivity(activity.Activity):
 
@@ -380,12 +387,17 @@ def _create_tab(self, tab_state):
             for l in tab_state['scrollback']:
                 vt.feed(str(l) + '\r\n')
 
-        sucess_, box.pid = vt.fork_command_full(Vte.PtyFlags.DEFAULT,
-                                                os.environ["HOME"],
-                                                ["/bin/bash"], [],
-                                                GLib.SpawnFlags.
-                                                DO_NOT_REAP_CHILD,
-                                                None, None)
+        if hasattr(vt, 'fork_command'):
+            sucess_, box.pid = vt.fork_command_full(
+                Vte.PtyFlags.DEFAULT, os.environ["HOME"],
+                ["/bin/bash"], [], GLib.SpawnFlags. DO_NOT_REAP_CHILD,
+                None, None)
+        else:
+            sucess_, box.pid = vt.spawn_sync(
+                Vte.PtyFlags.DEFAULT, os.environ["HOME"],
+                ["/bin/bash"], [], GLib.SpawnFlags. DO_NOT_REAP_CHILD,
+                None, None)
+
         self._notebook.props.page = index
         vt.grab_focus()
 
@@ -483,16 +495,17 @@ def is_selected(vte, *args):
                 return True
 
             page = self._notebook.get_nth_page(i)
-            """
-            try:
-                # get_text is only available in latest vte #676999
-                # and pygobject/gobject-introspection #690041
-                text, attr_ = page.vt.get_text(is_selected, None)
-            except AttributeError:
-                text = ''
-            """
-            # TODO: vt.get_text continue crashing at random
+
             text = ''
+            if VTE_VERSION >= 38:
+                # in older versions of vte, get_text() makes crash
+                # the activity at random - SL #4627
+                try:
+                    # get_text is only available in latest vte #676999
+                    # and pygobject/gobject-introspection #690041
+                    text, attr_ = page.vt.get_text(is_selected, None)
+                except AttributeError:
+                    pass
 
             scrollback_lines = text.split('\n')
 
@@ -549,8 +562,16 @@ def _configure_vt(self, vt):
                                        'bg_color': '#000000'}}
         fg_color = self._theme_colors[self._theme_state]['fg_color']
         bg_color = self._theme_colors[self._theme_state]['bg_color']
-        vt.set_colors(Gdk.color_parse(fg_color),
-                      Gdk.color_parse(bg_color), [])
+        try:
+            vt.set_colors(Gdk.color_parse(fg_color),
+                          Gdk.color_parse(bg_color), [])
+        except TypeError:
+            # Vte 0.38 requires the colors set as a different type
+            # in Fedora 21 we get a exception
+            # TypeError: argument foreground: Expected Gdk.RGBA,
+            # but got gi.overrides.Gdk.Color
+            vt.set_colors(Gdk.RGBA(*Gdk.color_parse(fg_color).to_floats()),
+                          Gdk.RGBA(*Gdk.color_parse(bg_color).to_floats()), [])
 
         blink = self._get_conf(conf, 'cursor_blink', False)
         vt.set_cursor_blink_mode(blink)
@@ -569,10 +590,14 @@ def _configure_vt(self, vt):
         scroll_output = self._get_conf(conf, 'scroll_on_output', False)
         vt.set_scroll_on_output(scroll_output)
 
-        emulation = self._get_conf(conf, 'emulation', 'xterm')
-        vt.set_emulation(emulation)
+        if hasattr(vt, 'set_emulation'):
+            # set_emulation is not available after vte commit
+            # 4e253be9282829f594c8a55ca08d1299e80e471d
+            emulation = self._get_conf(conf, 'emulation', 'xterm')
+            vt.set_emulation(emulation)
 
-        visible_bell = self._get_conf(conf, 'visible_bell', False)
-        vt.set_visible_bell(visible_bell)
+        if hasattr(vt, 'set_visible_bell'):
+            visible_bell = self._get_conf(conf, 'visible_bell', False)
+            vt.set_visible_bell(visible_bell)
 
         conf.write(open(conf_file, 'w'))