svnbrowse: Add a 'status bar' in the bottom.

Now there is little confusion between the info bar and the status bar. The info
bar is the thing on top and status bar is behind the list. I find a better name
for them in a following commit.

The status bar will display the action that is currently running. For example,
when we are fetching stuff from server, the text will be updated from 'Ready'
to something else. Which is not yet implemented and it always displays fixed
title.

On the right hand side, there is information about the scroller. Its design is
almost fully stolen from vim; it shows percentage of current page's scrolling
offset with custom title when displaying the whole directory on a single page
and the most top & bottom positioning.

The 'branding' title is now moved to the status bar so it doesn't take space
from URL.

* subversion/svnbrowse/svnbrowse.c
  (COLOR_PAIR_STATUS_BAR): New constant.
  (svn_browse__view_t): Add statusbar to the struct.
  (view_layout): Setup layout for the new statusbar; it takes one more line
   from the list.
  (view_draw_info_bar): Remove branding.
  (format_percentage_scroll): New function to handle thaf scroller title logic.
  (view_draw_status_bar): New function for rendering the status bar.
  (view_draw): Call view_draw_status_bar().
  (sub_main): Initialize the COLOR_PAIR_STATUS_BAR color pair.


git-svn-id: https://svn.apache.org/repos/asf/subversion/trunk@1933121 13f79535-47bb-0310-9956-ffa450edef68

Author: rinrab

subversion/svnbrowse/svnbrowse.c

@@ -117,6 +117,7 @@ const apr_getopt_option_t svn_browse__options[] =
 
 enum {
   COLOR_PAIR_INFO_BAR = 1,
+  COLOR_PAIR_STATUS_BAR,
   COLOR_PAIR_DIR,
   COLOR_PAIR_DIR_SELECTED,
   COLOR_PAIR_FILE,
@@ -128,6 +129,7 @@ typedef struct svn_browse__view_t {
   svn_browse__model_t *model;
   WINDOW *screen;
   WINDOW *infobar;
+  WINDOW *statusbar;
   WINDOW *list;
 } svn_browse__view_t;
 
@@ -143,16 +145,20 @@ view_cleanup(void *ctx)
 static void
 view_layout(svn_browse__view_t *view)
 {
-  int infobar_height = 1;
   int cols = getmaxx(view->screen);
   int rows = getmaxy(view->screen);
+  int infobar_height = 1;
+  int statusbar_height = 1;
+  int list_height = rows - infobar_height - statusbar_height;
 
   delwin(view->infobar);
+  delwin(view->statusbar);
   delwin(view->list);
 
   view->infobar = subwin(view->screen, infobar_height, cols, 0, 0);
-  view->list = subwin(view->screen, rows - infobar_height, cols,
-                      infobar_height, 0);
+  view->list = subwin(view->screen, list_height, cols, infobar_height, 0);
+  view->statusbar = subwin(view->screen, statusbar_height, cols,
+                           infobar_height + list_height, 0);
 }
 
 static svn_browse__view_t *
@@ -369,7 +375,7 @@ view_draw_info_bar(svn_browse__view_t *view, WINDOW *win,
       view->model->root, view->model->current->relpath, scratch_pool);
   svn_stringbuf_t *buf = svn_stringbuf_create_empty(scratch_pool);
   const char *prefix = "  ";
-  const char *suffix = "Apache Subversion  ";
+  const char *suffix = "  ";
 
   wmove(win, 0, 0);
   wattrset(win, COLOR_PAIR(COLOR_PAIR_INFO_BAR));
@@ -380,12 +386,59 @@ view_draw_info_bar(svn_browse__view_t *view, WINDOW *win,
   waddstr(win, suffix);
 }
 
+static char *
+format_percentage_scroll(int scroll, int size, int height, apr_pool_t *pool)
+{
+  if (size <= height)
+    return "All";
+  else if (scroll <= 0)
+    return "Top";
+  else if (scroll + height >= size)
+    return "Bot";
+  else
+    {
+      /* Oops, if size and heigth perfectly line up, we would segfault to
+       * division by zero. Nope... We wouldn not. There is a check right
+       * above. */
+
+      int percentage = (scroll) * 100 / (size - height);
+      return apr_psprintf(pool, "%d%%", percentage);
+    }
+}
+
+static void
+view_draw_status_bar(svn_browse__view_t *view, WINDOW *win,
+                     apr_pool_t *scratch_pool)
+{
+  const char *brand = "Apache Subversion  ";
+  const svn_browse__state_t *state = view->model->current;
+
+  wmove(win, 0, 0);
+  wattrset(win, COLOR_PAIR(COLOR_PAIR_STATUS_BAR));
+  waddstr(win, "  ");
+  waddstr(win, rightpad(apr_psprintf(scratch_pool, "Ready"),
+                        getmaxx(win) - 4 - strlen(brand) - 16,
+                        scratch_pool));
+  waddstr(win, brand);
+  waddstr(win, leftpad(apr_psprintf(scratch_pool, "%d/%d",
+                                    state->selection + 1, state->list->nelts),
+                       8, scratch_pool));
+  waddstr(win, leftpad(format_percentage_scroll(state->scroller_offset,
+                                                state->list->nelts,
+                                                getmaxy(view->list),
+                                                scratch_pool),
+                       8, scratch_pool));
+  waddstr(win, "  ");
+}
+
+
 static void
 view_draw(svn_browse__view_t *view, apr_pool_t *pool)
 {
   int i;
 
   view_draw_info_bar(view, view->infobar, pool);
+  view_draw_status_bar(view, view->statusbar, pool);
 
   for (i = 0; i < view->model->current->list->nelts; i++)
     {
@@ -629,6 +682,7 @@ sub_main(int *code, int argc, const char *argv[], apr_pool_t *pool)
   use_default_colors();
 
   init_pair(COLOR_PAIR_INFO_BAR, COLOR_YELLOW, COLOR_BRANDING);
+  init_pair(COLOR_PAIR_STATUS_BAR, COLOR_YELLOW, COLOR_SECONDARY);
   init_pair(COLOR_PAIR_DIR, COLOR_CYAN, -1);
   init_pair(COLOR_PAIR_DIR_SELECTED, COLOR_CYAN, COLOR_PRIMARY);
   init_pair(COLOR_PAIR_FILE, -1, -1);