[RFE][PATCH] Display free space on device in panels

[Pavel Tsekov]

On Mon, 29 May 2006, Jindrich Novy wrote:

> On Fri, 2006-05-19 at 14:29 -0400, Pavel Roskin wrote:
>> Can we avoid any highlighting?  I think Far Manager does it right:
>> http://red-bean.com/proski/mc/far.png
>
> Attaching the patch without highlighting. The main changes are that I
> moved the show_free_space() into main.c since screen.c lacks a header
> file and a call is needed from cmd.c to minimize frequency of gathering
> filesys info. The free space widget isn't displayed at all when browsing
> a non-local fs. Filesystem statistics are updated immediately when mc
> requests a reread (ctrl-r is pressed).
>
> Please review, some further mistakes are possible.

Now, after I reviewed the patch for a second time I am pretty convinced 
that the free space info should be displayed in the mini status area
and not on its upper frame i.e. as it is in FAR manager (what Pavel 
Rosking suggested). Here is why:

MC tries to optimize the screen drawing by updating only certain parts
of the screen (the directory contents, the mini status) when not otherwise 
necessary. Simply put MC doesn't update the whole screen when you go down 
one file in the panel, when you change a directory, etc. With the current 
patch you actually break that optimization by inserting a call to
mini_info_separator() in show_dir() which is called each time you move
through the file list for example.

Your patch may be modified to so that it will work properly i.e. it wont
break the optimization but it becomes ugly (codewise). It may be modified
to be not so ugly by sacrificing the optimization a bit i.e. put
a call to mini_info_separator () in panel_update_contents(). It also
can be made to fit into the current scheme by making the free space info
part of the mini status area.

Now, there are some other small issues with the patch as-is:

--- mc-4.6.1a/src/main.c.showfree	2006-05-29 12:41:36.000000000 +0200
+++ mc-4.6.1a/src/main.c	2006-05-29 13:04:50.000000000 +0200
@@ -402,6 +409,8 @@
      int reload_other = !(force_update & UP_ONLY_CURRENT);
      WPanel *panel;

+    show_free_space(current_panel);
+
      update_one_panel (get_current_index (), force_update, current_file);
      if (reload_other)
  	update_one_panel (get_other_index (), force_update, UP_KEEPSEL);

This part is not necessary. And it will draw the free_space_info() even
if there is no mini status (though you won't see it).

@@ -467,6 +476,37 @@
      }
  }

+void
+show_free_space(WPanel *panel)
+{
+    struct stat st;

This is not necessary as well as the code which fills it.