[gtksourceview] Support incrementing and decrementing numbers

[Paolo Borelli <pborelli src gnome org>]

commit d8ea0cac7687c125897b872ad5ecc8e053887eac
Author: Paolo Borelli <pborelli gnome org>
Date:   Mon Feb 2 21:32:21 2015 +0100

    Support incrementing and decrementing numbers
    
    Add an action signal to change numbers at the current cursor position
    (if present) and wire them to ctrl+shift+a and ctrl+shift+x

 gtksourceview/gtksourceview.c |   93 +++++++++++++++++++++++++++++++++++++++++
 1 files changed, 93 insertions(+), 0 deletions(-)
---
diff --git a/gtksourceview/gtksourceview.c b/gtksourceview/gtksourceview.c
index 100a02a..3def363 100644
--- a/gtksourceview/gtksourceview.c
+++ b/gtksourceview/gtksourceview.c
@@ -132,6 +132,7 @@ enum {
        MOVE_WORDS,
        SMART_HOME_END,
        MOVE_TO_MATCHING_BRACKET,
+       CHANGE_NUMBER,
        LAST_SIGNAL
 };
 
@@ -346,6 +347,68 @@ gtk_source_view_move_to_matching_bracket (GtkSourceView *view,
 }
 
 static void
+gtk_source_view_change_number (GtkSourceView *view,
+                               gint           count)
+{
+       GtkTextView *text_view = GTK_TEXT_VIEW (view);
+       GtkTextBuffer *buffer;
+       GtkTextIter start, end;
+       gchar *str;
+
+       buffer = gtk_text_view_get_buffer (text_view);
+       if (!GTK_SOURCE_IS_BUFFER (buffer))
+       {
+               return;
+       }
+
+       if (!gtk_text_buffer_get_selection_bounds (buffer, &start, &end))
+       {
+               if (!gtk_text_iter_starts_word (&start))
+               {
+                       gtk_text_iter_backward_word_start (&start);
+               }
+
+               if (!gtk_text_iter_ends_word (&end))
+               {
+                       gtk_text_iter_forward_word_end (&end);
+               }
+       }
+
+       str = gtk_text_buffer_get_text (buffer, &start, &end, FALSE);
+
+       if (str != NULL && *str != '\0')
+       {
+               gchar *p;
+               gint64 n;
+               gsize len;
+
+               len = gtk_text_iter_get_offset (&end) - gtk_text_iter_get_offset (&start);
+               g_assert (len > 0);
+
+               n = g_ascii_strtoll (str, &p, 10);
+
+               /* do the action only if strtoll succeeds (p != str) and
+                * the whole string is the number, e.g. not 123abc
+                */
+               if ((p - str) == len)
+               {
+                       gchar *newstr;
+
+                       newstr = g_strdup_printf ("%"G_GINT64_FORMAT, (n + count));
+
+                       gtk_text_buffer_begin_user_action (buffer);
+                       gtk_text_buffer_delete (buffer, &start, &end);
+                       gtk_text_buffer_insert (buffer, &start, newstr, -1);
+                       gtk_text_buffer_end_user_action (buffer);
+
+                       g_free (newstr);
+               }
+
+               g_free (str);
+       }
+}
+
+static void
 gtk_source_view_class_init (GtkSourceViewClass *klass)
 {
        GObjectClass     *object_class;
@@ -710,6 +773,25 @@ gtk_source_view_class_init (GtkSourceViewClass *klass)
                                            1,
                                            G_TYPE_BOOLEAN);
 
+       /**
+        * GtkSourceView::change-number:
+        * @view: the #GtkSourceView
+        * @count: the number to add to the number at the current position
+        *
+        * Keybinding signal to edit a number at the current cursor position.
+        *
+        * Since: 3.16
+        */
+       signals[CHANGE_NUMBER] =
+               g_signal_new_class_handler ("change-number",
+                                           G_TYPE_FROM_CLASS (klass),
+                                           G_SIGNAL_RUN_LAST | G_SIGNAL_ACTION,
+                                           G_CALLBACK (gtk_source_view_change_number),
+                                           NULL, NULL, NULL,
+                                           G_TYPE_NONE,
+                                           1,
+                                           G_TYPE_INT);
+
        binding_set = gtk_binding_set_by_class (klass);
 
        gtk_binding_entry_add_signal (binding_set,
@@ -864,6 +946,17 @@ gtk_source_view_class_init (GtkSourceViewClass *klass)
                                      GDK_CONTROL_MASK,
                                      "move_to_matching_bracket", 1,
                                      G_TYPE_BOOLEAN, FALSE);
+
+       gtk_binding_entry_add_signal (binding_set,
+                                     GDK_KEY_a,
+                                     GDK_CONTROL_MASK | GDK_SHIFT_MASK,
+                                     "change-number", 1,
+                                     G_TYPE_INT, 1);
+       gtk_binding_entry_add_signal (binding_set,
+                                     GDK_KEY_x,
+                                     GDK_CONTROL_MASK | GDK_SHIFT_MASK,
+                                     "change-number", 1,
+                                     G_TYPE_INT, -1);
 }
 
 static GObject *