[gnome-disk-utility] Convey free space for mounted volumes

[David Zeuthen <davidz src gnome org>]

commit f6107df3d6cde5243dba37b6d1eac8a41306d457
Author: David Zeuthen <zeuthen gmail com>
Date:   Wed Jan 9 12:39:23 2013 -0500

    Convey free space for mounted volumes
    
    http://people.freedesktop.org/~david/disks-free-space.png
    
    Signed-off-by: David Zeuthen <zeuthen gmail com>

 src/disks/gduvolumegrid.c |   23 +++++++++++++++++++++++
 src/disks/gduwindow.c     |   34 ++++++++++++++++++++++++++++++----
 src/libgdu/gduutils.c     |   40 +++++++++++++++++++++++++++++++++++++++-
 src/libgdu/gduutils.h     |    4 ++++
 4 files changed, 96 insertions(+), 5 deletions(-)
---
diff --git a/src/disks/gduvolumegrid.c b/src/disks/gduvolumegrid.c
index fd4373a..0d71cb7 100644
--- a/src/disks/gduvolumegrid.c
+++ b/src/disks/gduvolumegrid.c
@@ -43,6 +43,7 @@ struct GridElement
   UDisksObject *object;
   gint64 offset;
   gint64 size;
+  gint64 unused;
 
   GList *embedded_elements;
   GridElement *parent;
@@ -804,6 +805,24 @@ render_element (GduVolumeGrid *grid,
   gtk_render_frame (context, cr, x, y, w, h);
   if (is_focused && is_grid_focused)
     gtk_render_focus (context, cr, x + 2, y + 2, w - 4, h - 4);
+  if (element->unused > 0)
+    {
+      gdouble unused_height = element->unused * h / element->size;
+      cairo_pattern_t *gradient;
+      cairo_save (cr);
+      gradient = cairo_pattern_create_linear (x, y + unused_height - 10, x, y + unused_height);
+      cairo_pattern_add_color_stop_rgba (gradient, 0.0,  1.0, 1.0, 1.0, 0.25);
+      cairo_pattern_add_color_stop_rgba (gradient, 1.0,  1.0, 1.0, 1.0, 0.00);
+      cairo_set_source (cr, gradient);
+      cairo_pattern_destroy (gradient);
+      cairo_rectangle (cr,
+                       x,
+                       y,
+                       w,
+                       unused_height);
+      cairo_fill (cr);
+      cairo_restore (cr);
+    }
   gtk_style_context_restore (context);
 
   /* icons */
@@ -1655,6 +1674,10 @@ grid_element_set_details (GduVolumeGrid  *grid,
             mount_points = udisks_filesystem_get_mount_points (filesystem);
             if (g_strv_length ((gchar **) mount_points) > 0)
               element->show_mounted = TRUE;
+
+            element->unused = gdu_utils_get_unused_for_block (grid->client, block);
+            if (element->unused < 0)
+              element->unused = 0;
           }
         else if (g_strcmp0 (usage, "other") == 0 && g_strcmp0 (type, "swap") == 0)
           {
diff --git a/src/disks/gduwindow.c b/src/disks/gduwindow.c
index 867e127..257685e 100644
--- a/src/disks/gduwindow.c
+++ b/src/disks/gduwindow.c
@@ -3154,6 +3154,7 @@ update_device_page_for_block (GduWindow          *window,
   UDisksObject *drive_object;
   UDisksDrive *drive = NULL;
   GList *jobs = NULL;
+  gint64 unused_space = -1;
 
   read_only = udisks_block_get_read_only (block);
   partition = udisks_object_peek_partition (object);
@@ -3189,6 +3190,8 @@ update_device_page_for_block (GduWindow          *window,
         }
     }
 
+  unused_space = gdu_utils_get_unused_for_block (window->client, block);
+
   if (partition != NULL && !read_only)
     show_flags->volume_buttons |= SHOW_FLAGS_VOLUME_BUTTONS_PARTITION_DELETE;
 
@@ -3225,10 +3228,33 @@ update_device_page_for_block (GduWindow          *window,
   g_free (s);
   if (size > 0)
     {
-      set_size (window,
-                "devtab-size-label",
-                "devtab-size-value-label",
-                size, SET_MARKUP_FLAGS_HYPHEN_IF_EMPTY);
+      if (unused_space > 0)
+        {
+          s2 = udisks_client_get_size_for_display (window->client, unused_space, FALSE, FALSE);
+          s3 = udisks_client_get_size_for_display (window->client, size, FALSE, FALSE);
+          /* Translators: Shown in 'Size' field for a filesystem where we know the amount of unused
+           *              space.
+           *              The first %s is a short string with the size (e.g. '69 GB (68,719,476,736 bytes)').
+           *              The second %s is a short string with the space free (e.g. '43 GB').
+           *              The %f is the percentage in use (e.g. 62.2).
+           */
+          s = g_strdup_printf (_("%s â %s free (%.1f%% full)"), s3, s2,
+                               100.0 * (size - unused_space) / size);
+          g_free (s3);
+          g_free (s2);
+          set_markup (window,
+                      "devtab-size-label",
+                      "devtab-size-value-label",
+                      s, SET_MARKUP_FLAGS_NONE);
+          g_free (s);
+        }
+      else
+        {
+          set_size (window,
+                    "devtab-size-label",
+                    "devtab-size-value-label",
+                    size, SET_MARKUP_FLAGS_HYPHEN_IF_EMPTY);
+        }
     }
   else
     {
diff --git a/src/libgdu/gduutils.c b/src/libgdu/gduutils.c
index 1913d74..d3d1498 100644
--- a/src/libgdu/gduutils.c
+++ b/src/libgdu/gduutils.c
@@ -9,8 +9,8 @@
 
 #include "config.h"
 #include <glib/gi18n.h>
-
 #include <math.h>
+#include <sys/statvfs.h>
 
 #include "gduutils.h"
 
@@ -1021,3 +1021,41 @@ gdu_utils_is_in_use (UDisksClient *client,
   return ret;
 }
 
+/* ---------------------------------------------------------------------------------------------------- */
+
+gint64
+gdu_utils_get_unused_for_block (UDisksClient *client,
+                                UDisksBlock  *block)
+{
+  gint64 ret = -1;
+  UDisksFilesystem *filesystem = NULL;
+  UDisksObject *object = NULL;
+  const gchar *const *mount_points = NULL;
+  struct statvfs statvfs_buf;
+
+  object = (UDisksObject *) g_dbus_interface_get_object (G_DBUS_INTERFACE (block));
+  if (object == NULL)
+    goto out;
+
+  filesystem = udisks_object_peek_filesystem (object);
+  if (filesystem == NULL)
+    {
+      /* TODO: Look at UDisksFilesystem property set from the udev db populated by blkid(8) */
+      goto out;
+    }
+
+  mount_points = udisks_filesystem_get_mount_points (filesystem);
+  if (mount_points == NULL || mount_points[0] == NULL)
+    goto out;
+
+  if (statvfs (mount_points[0], &statvfs_buf) != 0)
+    {
+      g_warning ("Error calling statvfs on path %s: %m", mount_points[0]);
+      goto out;
+    }
+
+  ret = ((gint64) statvfs_buf.f_bfree) * ((gint64) statvfs_buf.f_bsize);
+
+ out:
+  return ret;
+}
diff --git a/src/libgdu/gduutils.h b/src/libgdu/gduutils.h
index 75274ba..d22fbfa 100644
--- a/src/libgdu/gduutils.h
+++ b/src/libgdu/gduutils.h
@@ -73,6 +73,10 @@ gchar *gdu_utils_get_pretty_uri (GFile *file);
 gboolean gdu_utils_is_in_use (UDisksClient *client,
                               UDisksObject *object);
 
+gint64 gdu_utils_get_unused_for_block (UDisksClient *client,
+                                       UDisksBlock  *block);
+
+
 
 G_END_DECLS