* only show the help button if a help viewer is installed (currently only

  yelp is supported - have not found anyone who could help me on khelpcenter   
  yet)
* do not run the help viewer as root
* do not depend on the gnome python module anymore

1 files changed, 33 insertions, 0 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)