[gnome-builder/wip/libide] libide: add movement for smart selection of line characters

[Christian Hergert <chergert src gnome org>]

commit 31bcdc5fc324d6cf126940b6557a4db487d4f761
Author: Christian Hergert <christian hergert me>
Date:   Thu Mar 5 17:09:14 2015 -0800

    libide: add movement for smart selection of line characters
    
    This acts like the common behavior of vim when using ctrl+u during insert
    mode. If you have a better name selection, i'm all ears.

 libide/ide-source-view-movements.c |   44 ++++++++++++++++++++++++++++++++---
 libide/ide-source-view.h           |    5 ++++
 2 files changed, 45 insertions(+), 4 deletions(-)
---
diff --git a/libide/ide-source-view-movements.c b/libide/ide-source-view-movements.c
index 6670091..66f76e4 100644
--- a/libide/ide-source-view-movements.c
+++ b/libide/ide-source-view-movements.c
@@ -209,12 +209,44 @@ ide_source_view_movements_first_nonspace_char (IdeSourceView         *self,
          g_unichar_isspace (ch))
     gtk_text_iter_forward_char (&insert);
 
+  ide_source_view_movements_select_range (self, &insert, &selection, extend_selection);
+}
+
+static void
+ide_source_view_movements_line_chars (IdeSourceView         *self,
+                                      IdeSourceViewMovement  movement,
+                                      gboolean               extend_selection,
+                                      gint                   param)
+{
+  GtkTextIter insert;
+  GtkTextIter selection;
+
+  ide_source_view_movements_get_selection (self, &insert, &selection);
+
   /*
-   * if we are at the line end, there was only whitespace.
-   * instead let's jump to the beginning of the line.
+   * Selects the current position up to the first nonspace character.
+   * If the cursor is at the line start, we will select the newline.
+   * If only whitespace exists, we will select line offset of 0.
    */
-  if (gtk_text_iter_ends_line (&insert))
-    gtk_text_iter_set_line_offset (&insert, 0);
+
+  if (gtk_text_iter_starts_line (&insert))
+    {
+      gtk_text_iter_backward_char (&insert);
+    }
+  else
+    {
+      gunichar ch;
+
+      gtk_text_iter_set_line_offset (&insert, 0);
+
+      while (!gtk_text_iter_ends_line (&insert) &&
+             (ch = gtk_text_iter_get_char (&insert)) &&
+             g_unichar_isspace (ch))
+        gtk_text_iter_forward_char (&insert);
+
+      if (gtk_text_iter_ends_line (&insert))
+        gtk_text_iter_set_line_offset (&insert, 0);
+    }
 
   ide_source_view_movements_select_range (self, &insert, &selection, extend_selection);
 }
@@ -1115,6 +1147,10 @@ _ide_source_view_apply_movement (IdeSourceView         *self,
     case IDE_SOURCE_VIEW_MOVEMENT_LINE_PERCENTAGE:
       break;
 
+    case IDE_SOURCE_VIEW_MOVEMENT_LINE_CHARS:
+      ide_source_view_movements_line_chars (self, movement, extend_selection, param);
+      break;
+
     case IDE_SOURCE_VIEW_MOVEMENT_HALF_PAGE_UP:
     case IDE_SOURCE_VIEW_MOVEMENT_HALF_PAGE_DOWN:
     case IDE_SOURCE_VIEW_MOVEMENT_PAGE_UP:
diff --git a/libide/ide-source-view.h b/libide/ide-source-view.h
index 8ca9397..ef91aa0 100644
--- a/libide/ide-source-view.h
+++ b/libide/ide-source-view.h
@@ -91,6 +91,9 @@ typedef enum
  * @IDE_SOURCE_VIEW_MOVEMENT_LAST_LINE: move to last line in file, with line offset of zero.
  * @IDE_SOURCE_VIEW_MOVEMENT_LINE_PERCENTAGE: move to line based on percentage. Use repeat to
  *   specify the percentage, 0 to 100.
+ * @IDE_SOURCE_VIEW_MOVEMENT_LINE_CHARS: special selection to select all line characters up to the
+ *   cursor position. special care will be taken if the line is blank to select only the blank
+ *   space if any. otherwise, the line break will be selected.
  * @IDE_SOURCE_VIEW_MOVEMENT_HALF_PAGE_UP: move half a page up.
  * @IDE_SOURCE_VIEW_MOVEMENT_HALF_PAGE_DOWN: move half a page down.
  * @IDE_SOURCE_VIEW_MOVEMENT_PAGE_UP: move a full page up.
@@ -146,6 +149,8 @@ typedef enum
   IDE_SOURCE_VIEW_MOVEMENT_LAST_LINE,
   IDE_SOURCE_VIEW_MOVEMENT_LINE_PERCENTAGE,
 
+  IDE_SOURCE_VIEW_MOVEMENT_LINE_CHARS,
+
   IDE_SOURCE_VIEW_MOVEMENT_HALF_PAGE_UP,
   IDE_SOURCE_VIEW_MOVEMENT_HALF_PAGE_DOWN,