From a54d9701d8f561c884f6ca742d8a290ac6e6a12a Mon Sep 17 00:00:00 2001
From: Kristian Rumberg <kristianrumberg@gmail.com>
Date: Sun, 17 Aug 2008 19:10:11 +0200
Subject: [PATCH] Now only displays commands if the backends
 (ffmpeg/ffmpeg2thera etc.) are found. Refuces to start if no backend is found
 at all

---
 commands.py | 20 +++++++++++++++++++-
 gui.py      |  9 +++++++++
 2 files changed, 28 insertions(+), 1 deletion(-)

diff --git a/commands.py b/commands.py
index fb475b5..d4ab643 100644
--- a/commands.py
+++ b/commands.py
@@ -133,6 +133,19 @@ class CommandList:
         else:
             raise Error("Error: No config found")
 
+    def _cmd_program_found_in_path(self, programstr):
+        if not os.environ.has_key('PATH') or os.environ['PATH']=='':
+            p = os.defpath
+        else:
+            p = os.environ['PATH']
+
+        pathlist = p.split (os.pathsep)
+        for path in pathlist:
+            f = os.path.join(path, programstr)
+            if os.access(f, os.X_OK):
+                return True
+        return False
+
     def _read_config(self):
         doc = libxml2.parseFile(self._get_config_path())
         cmd_xmllist = doc.xpathEval( '//command')
@@ -161,7 +174,9 @@ class CommandList:
                             raise Error("Error parsing XML: only variable and optionalsetting elements allowed in command")
 
                 props = self._read_properties(cmdnode.properties, ["name", "call", "ext"])
-                self.cmdcall_dict[props["name"]] = Command(props["name"], props["call"], props["ext"], var_list, optset_list)
+
+                if self._cmd_program_found_in_path( props["call"].split()[0] ):
+                    self.cmdcall_dict[props["name"]] = Command(props["name"], props["call"], props["ext"], var_list, optset_list)
 
             else:
                 raise Error("Error parsing XML: only command elements are supported")
@@ -169,5 +184,8 @@ class CommandList:
     def __iter__(self):
         return self.cmdcall_dict.values().__iter__()
 
+    def __len__(self):
+        return len(self.cmdcall_dict)
+
     def __getitem__(self, name):
         return self.cmdcall_dict[name]
diff --git a/gui.py b/gui.py
index 1c51117..3d248b7 100644
--- a/gui.py
+++ b/gui.py
@@ -13,6 +13,7 @@
 # ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 # OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 
+import sys
 import os
 import gtk
 import gobject
@@ -126,6 +127,14 @@ class MyGui:
         CommandExecuter(GtkCommandExecuterView(), command, self.file_list, outdir)
 
     def __init__(self, commands):
+
+        if 0 == len(commands):
+            dialog = gtk.MessageDialog(None, gtk.DIALOG_MODAL | gtk.DIALOG_DESTROY_WITH_PARENT,gtk.MESSAGE_ERROR, gtk.BUTTONS_OK)
+            dialog.set_markup("None of the programs needed for the conversions specified in commands.xml were found. Cannot continue")
+            dialog.run()
+            dialog.destroy()
+            sys.exit(-1)
+
         self.file_list = []
         self.commands = commands
 
-- 
2.11.4.GIT