adaptive indentation in emacs? [duplicate]

Question

Possible Duplicate:
Emacs code to automatically set indent-tabs-mode according to existing code

When I'm editing old files in a group where other people may work on them tomorrow or ten years from now, I like to adopt the file's existing tab or space indentation scheme for my additions/changes - that's just being polite, but it's currently something of a hassle. Does anyone have a way for emacs to look for the current indentation scheme in the file or at least the neighboring lines and use that for Tab indentation?

Answer 1

The following sound promising:

• http://www.emacswiki.org/emacs/GuessStyle
• https://savannah.nongnu.org/projects/dtrt-indent/
• http://www.emacswiki.org/emacs/FuzzyFormat

A comparison/review would be interesting.