[gegl] Bring back option for "gegl" binary to show graphs.

[Jon Nordby <jonnor src gnome org>]

commit 8c101b704a9f2350f1ad98f551db4ed43e4443ed
Author: Jon Nordby <jononor gmail com>
Date:   Wed Jul 20 00:26:05 2011 +0200

    Bring back option for "gegl" binary to show graphs.
    
    Partial revert of 57ac8cfd3262978d19680f69c6b9ce7311fd1085

 bin/gegl-options.c |    2 +-
 bin/gegl-options.h |    1 +
 bin/gegl.c         |   12 ++++++++++++
 3 files changed, 14 insertions(+), 1 deletions(-)
---
diff --git a/bin/gegl-options.c b/bin/gegl-options.c
index 494bc39..e2d1d4f 100644
--- a/bin/gegl-options.c
+++ b/bin/gegl-options.c
@@ -28,7 +28,7 @@ static GeglOptions *opts_new (void)
 {
   GeglOptions *o = g_malloc0 (sizeof (GeglOptions));
 
-  o->mode     = GEGL_RUN_MODE_HELP;
+  o->mode     = GEGL_RUN_MODE_DISPLAY;
   o->xml      = NULL;
   o->output   = NULL;
   o->files    = NULL;
diff --git a/bin/gegl-options.h b/bin/gegl-options.h
index 8989fc6..073d62b 100644
--- a/bin/gegl-options.h
+++ b/bin/gegl-options.h
@@ -24,6 +24,7 @@
 typedef enum
 {
   GEGL_RUN_MODE_HELP,
+  GEGL_RUN_MODE_DISPLAY,
   GEGL_RUN_MODE_OUTPUT,
   GEGL_RUN_MODE_XML
 } GeglRunMode;
diff --git a/bin/gegl.c b/bin/gegl.c
index f08b6d2..38cbeb5 100644
--- a/bin/gegl.c
+++ b/bin/gegl.c
@@ -214,6 +214,18 @@ main (gint    argc,
 
   switch (o->mode)
     {
+      case GEGL_RUN_MODE_DISPLAY:
+        {
+          GeglNode *output = gegl_node_new_child (gegl,
+                                                  "operation", "gegl:display",
+                                                  "window-title", o->file,
+                                                  NULL);
+          gegl_node_connect_from (output, "input", gegl_node_get_output_proxy (gegl, "output"), "output");
+          gegl_node_process (output);
+          g_object_unref (output);
+          g_main_loop_run (g_main_loop_new (NULL, TRUE));
+        }
+        break;
       case GEGL_RUN_MODE_XML:
         g_printf ("%s\n", gegl_node_to_xml (gegl, path_root));
         return 0;