The version 0.21 in svn allows to use plugins. This feature is experimental and his interface can be modified.
To use a plugin. Build it and copy the file (.so) or (.dll) in plugins subdirectory where the QDevelop application is installed.
Allow to indent the code in the current opened file. This plugin is based on AStyle project. Artistic Style is a source code indenter, source code formatter,
and source code beautifier for the C, C++, C# and Java