Add simple window stack, tracking view relation ship via parent member

This makes it possible to easily switch back to the main (or log) view
by closing the diff view, regardless of whether it is split or full-screen.

Requested-by: Aneesh Kumar <aneesh.kumar@gmail.com>
Signed-off-by: Jonas Fonseca <fonseca@diku.dk>

diff --git a/tig.c b/tig.c
index 0981593..6c49105 100644 (file)
--- a/tig.c
+++ b/tig.c
@@ -699,6 +699,10 @@ struct view {
        unsigned long offset;   /* Offset of the window top */
        unsigned long lineno;   /* Current line number */
 
+       /* If non-NULL, points to the view that opened this view. If this view
+        * is closed tig will switch back to the parent view. */
+       struct view *parent;
+
        /* Buffering */
        unsigned long lines;    /* Total number of lines */
        void **line;            /* Line index; each line contains user data */
@@ -1313,6 +1317,7 @@ open_view(struct view *prev, enum request request, enum open_flags flags)
                /* Continue loading split views in the background. */
                if (!split)
                        end_update(prev);
+               view->parent = prev;
        }
 
        if (view->pipe) {
@@ -1431,11 +1436,11 @@ view_driver(struct view *view, enum request request)
                return TRUE;
 
        case REQ_VIEW_CLOSE:
-               if (display[1]) {
-                       view = display[(current_view + 1) % ARRAY_SIZE(display)];
+               if (view->parent) {
                        memset(display, 0, sizeof(display));
                        current_view = 0;
-                       display[current_view] = view;
+                       display[current_view] = view->parent;
+                       view->parent = NULL;
                        resize_display();
                        redraw_display();
                        break;
@@ -1821,7 +1826,9 @@ static struct keymap keymap[] = {
         * h::
         *      Show man page.
         * q::
-        *      Close view if multiple views are open, else quit.
+        *      Close view, if multiple views are open it will jump back to the
+        *      previous view in the view stack. If it is the last open view it
+        *      will quit. Use 'Q' to quit all views at once.
         * Enter::
         *      This key is "context sensitive" depending on what view you are
         *      currently in. When in log view on a commit line or in the main