Draft: Add Caja Meld compare example

examples/meld.py

@@ -0,0 +1,48 @@
+# Examples: https://github.com/mate-desktop/python-caja/tree/master/examples
+
+import os
+
+from gi.repository import Caja, GObject
+
+
+class MeldMenuProvider(GObject.GObject, Caja.MenuProvider):
+    MELD_EXECUTABLE = 'meld'
+    MELD_ICON = '/usr/share/icons/hicolor/scalable/apps/org.gnome.Meld.svg'
+
+    def __init__(self):
+        pass
+
+    def menu_activate_cb(self, menu, files=None):
+        args = ''
+
+        if files and len(files):           
+            # Set working directory
+            os.chdir(os.path.dirname(files[0].get_location().get_path()))
+
+            # Start Meld with 1..3 files or directories
+            for i in range(0, 3):
+                if i >= len(files):
+                    break
+                args += '"{}" '.format(files[i].get_location().get_path())
+
+        # Start Meld
+        cmd = '{} {} &'.format(self.MELD_EXECUTABLE, args)
+        os.system(cmd)
+
+    def get_file_items(self, window, files):
+        top_menuitem = Caja.MenuItem(name='MeldMenuProvider::Meld', 
+                                     label='Meld compare', 
+                                     tip='',
+                                     icon=self.MELD_ICON)
+        top_menuitem.connect('activate', self.menu_activate_cb, files)
+
+        return top_menuitem,
+
+    def get_background_items(self, window, file):
+        bg_menuitem_meld = Caja.MenuItem(name='MeldMenuProvider::MeldBg', 
+                                         label='Meld', 
+                                         tip='',
+                                         icon=self.MELD_ICON)
+        bg_menuitem_meld.connect('activate', self.menu_activate_cb)
+
+        return bg_menuitem_meld,