Does Geany or Gedit provide a browser protocol in the way Textmate does with txmt://?

it's possible to easily create new protocol handlers in Gnome, all you have to do is add some keys in gconf.

In a terminal, type:

gconftool-2 -s /desktop/gnome/url-handlers/foo/command '/path/to/app %s' --type String
gconftool-2 -s /desktop/gnome/url-handlers/foo/enabled --type Boolean true

Replace foo on both lines with the protocol you want to register and /path/to/app with the path to the application you want to run. (from : http://kb.mozillazine.org/Register_protocol#All_Firefox_versions )

The accepted answer does not work on 11.04.

Here's my solution for gedit on 11.04: http://rystraum.com/blog/2012/05/rails-footnotes-with-gedit/

TLDR; version:

1. Create /usr/share/applications/foo-uri.desktop:

   [Desktop Entry]
   Name=Foo
   GenericName=Foo
   Comment=Open foo links in Gedit
   TryExec=open_gedit
   Exec=open_gedit %u
   Terminal=false
   Type=Application
   MimeType=x-scheme-handler/foo
   NoDisplay=true
   

2. Run sudo update-desktop-database

3. open_gedit script inside location that is in $PATH

   #!/bin/bash
   FILE=$1
   FILE=${FILE/foo\:\/\//}
   LINE=$(echo $FILE | grep -o "\&line=[0-9]\+")
   LINE=$(echo $LINE | grep -o "[0-9]\+")
   FILE=$(echo $FILE | grep -o "\(.\+\)\&")
   FILE=$(echo $FILE | cut -d'&' -f1)
   gedit +$LINE $FILE
   

4. Call as foo:///path/to/file&line=299