Automatically show next diff in the status view

Move view_request() to view.c where it belongs and, when changing a file
status in a split stage view spawned from the status view, use it to
simulate pressing the Enter key in the parent view to display the next
diff.

Note: the behaviour is similar to that of the Up and Down keys, the
action has to be performed from the child view.

Closes jonas#413, closes jonas#469

include/tig/view.h

@@ -329,6 +329,8 @@ find_line_by_type(struct view *view, struct line *line, enum line_type type, int
 #define get_view_color(view, type)	get_line_color((view)->keymap->name, type)
 #define get_view_attr(view, type)	get_line_attr((view)->keymap->name, type)
 
+enum request view_request(struct view *view, enum request request);
+
 /*
  * Incremental updating
  */

src/stage.c

@@ -680,7 +680,9 @@ stage_request(struct view *view, enum request request, struct line *line)
 	 * stage view if it doesn't. */
 	if (view->parent && !stage_exists(view, &stage_status, stage_line_type)) {
 		stage_line_type = 0;
-		return REQ_VIEW_CLOSE;
+		return view->parent == &status_view
+				? view_request(view->parent, REQ_ENTER)
+				: REQ_VIEW_CLOSE;
 	}
 
 	refresh_view(view);

src/tig.c

@@ -60,38 +60,6 @@
 #include <pcre.h>
 #endif
 
-static bool
-forward_request_to_child(struct view *child, enum request request)
-{
-	return displayed_views() == 2 && view_is_displayed(child) &&
-		!strcmp(child->vid, child->ops->id);
-}
-
-static enum request
-view_request(struct view *view, enum request request)
-{
-	if (!view || !view->lines)
-		return request;
-
-	if (request == REQ_ENTER && view == display[0] &&
-	    !opt_focus_child && opt_send_child_enter &&
-	    view_has_flags(view, VIEW_SEND_CHILD_ENTER)) {
-		struct view *child = display[1];
-
-		if (forward_request_to_child(child, request)) {
-			view_request(child, request);
-			return REQ_NONE;
-		}
-	}
-
-	if (request == REQ_REFRESH && !view_can_refresh(view)) {
-		report("This view can not be refreshed");
-		return REQ_NONE;
-	}
-
-	return view->ops->request(view, request, &view->line[view->pos.lineno]);
-}
-
 /*
  * Option management
  */

src/view.c

@@ -1596,6 +1596,38 @@ find_line_by_type(struct view *view, struct line *line, enum line_type type, int
 	return NULL;
 }
 
+static inline bool
+forward_request_to_child(struct view *child, enum request request)
+{
+	return displayed_views() == 2 && view_is_displayed(child) &&
+		!strcmp(child->vid, child->ops->id);
+}
+
+enum request
+view_request(struct view *view, enum request request)
+{
+	if (!view || !view->lines)
+		return request;
+
+	if (request == REQ_ENTER && view == display[0] &&
+	    !opt_focus_child && opt_send_child_enter &&
+	    view_has_flags(view, VIEW_SEND_CHILD_ENTER)) {
+		struct view *child = display[1];
+
+		if (forward_request_to_child(child, request)) {
+			view_request(child, request);
+			return REQ_NONE;
+		}
+	}
+
+	if (request == REQ_REFRESH && !view_can_refresh(view)) {
+		report("This view can not be refreshed");
+		return REQ_NONE;
+	}
+
+	return view->ops->request(view, request, &view->line[view->pos.lineno]);
+}
+
 /*
  * Line utilities.
  */

test/status/file-name-test

@@ -19,13 +19,15 @@ steps '
 	:enter
 	:save-display status-with-file-1.screen
 	:status-update
+	:save-display status-with-file-2.screen
+	:view-close
 
 	:7
 	:status-update
 
 	:9
 	:enter
-	:save-display status-with-file-2.screen
+	:save-display status-with-file-3.screen
 '
 
 git_init
@@ -104,6 +106,23 @@ Untracked files:                                            |ø
 EOF
 
 assert_equals 'status-with-file-2.screen' <<EOF
+Initial commit                                              |我
+Changes to be committed:                                    |树
+A a                                                         |漢
+Changes not staged for commit:                              |
+  (no files)                                                |
+Untracked files:                                            |
+? 0                                                         |
+? as测试asd                                                 |
+? øå                                                        |
+? 可愛いコー特集                                            |
+                                                            |
+                                                            |
+                                                            |
+[status] Press u to stage 'as测试asd' for addition      100%|[stage] Untracked file as测试asd - line 1 of 3         100%
+EOF
+
+assert_equals 'status-with-file-3.screen' <<EOF
 Initial commit                                              |
 Changes to be committed:                                    |
 A 0                                                         |