2 files changed, 41 insertions, 1 deletions
diff --git a/UpdateManager/Common/HelpViewer.py b/UpdateManager/Common/HelpViewer.py
new file mode 100644
index 00000000..c8b099cc
--- /dev/null
+++ b/UpdateManager/Common/HelpViewer.py
@@ -0,0 +1,33 @@
+# helpviewer.py
+
+import os
+import subprocess
+
+# Hardcoded list of available help viewers
+# FIXME: khelpcenter support would be nice
+#KNOWN_VIEWERS = ["/usr/bin/yelp", "/usr/bin/khelpcenter"]
+KNOWN_VIEWERS = ["/usr/bin/yelp"]
+
+class HelpViewer:
+    def __init__(self, docu):
+        self.command = []
+        self.docu = docu
+        for viewer in KNOWN_VIEWERS:
+            if os.path.exists(viewer):
+                self.command = [viewer, "ghelp:%s" % docu]
+                break
+        
+    def check(self):
+        """check if a viewer is available"""
+        if self.command == []:
+            return False
+        else:
+            return True
+
+    def run(self):
+        """open the documentation in the viewer"""
+        # avoid running the help viewer as root
+        if os.getuid() == 0 and os.environ.has_key('SUDO_USER'):
+            self.command = ['sudo', '-u', os.environ['SUDO_USER']] +\
+                           self.command
+        subprocess.Popen(self.command)
diff --git a/UpdateManager/UpdateManager.py b/UpdateManager/UpdateManager.py
index 590391b9..742a711e 100644
--- a/UpdateManager/UpdateManager.py
+++ b/UpdateManager/UpdateManager.py
@@ -47,6 +47,7 @@ import pwd
 import time
 import thread
 import xml.sax.saxutils
+from Common.HelpViewer import HelpViewer
 
 
 from gettext import gettext as _
@@ -283,6 +284,12 @@ class UpdateManager(SimpleGladeApp):
           opener = urllib2.build_opener(proxy_support)
           urllib2.install_opener(opener)
 
+    # setup the help viewer and disable the help button if there
+    # is no viewer available
+    self.help_viewer = HelpViewer("update-manager")
+    if self.help_viewer.check() == False:
+        self.button_help.set_sensitive(False)
+
     self.gconfclient = gconf.client_get_default()
     # restore state
     self.restore_state()
@@ -461,7 +468,7 @@ class UpdateManager(SimpleGladeApp):
     self.fillstore()
 
   def on_button_help_clicked(self, widget):
-    subprocess.Popen(["/usr/bin/yelp", "ghelp:update-manager"])
+    self.help_viewer.run()
 
   def on_button_install_clicked(self, widget):
     #print "on_button_install_clicked"