Gedit snippets plugins allow smart code completion ala Textmate. Here is how to configure gedit to enable this feature :
1/ Download this file it contains symfony smart completion code
2/ Click “Edit” > “Preferences” and then select the plugins tab, scroll down unitl you found “Snippets”, Check it

screenshot-gedit-preferences.png

3/ Go to “Tools” > “Manage Snippets” and click on the import button you should now see the new snippets.

Snippet Manager

NB : The triggers are the small words between parentheses, for example for link_to(…) just type linktoTAB and tab again to move from first parameter to the next one. I’ll update this post soon with a full list of triggers.