Yet another C/C++ find other file

About

This extension allows to quickly switch between C/C++ header and a source file with the same name located in the directory tree or a git repository. It is an alternative to ff-find-other-file.

Rationale

The idea behind this extension is to have the solution which just works for the typical C/C++ projects with the minimal organizational discipline, without any project configuration in Emacs.

Usage

Add the following to your .emacs file:

(require 'cff)
;; defines shortcut for find source/header file for the current
;; file
(add-hook 'c++-mode-hook
 '(lambda ()
 (define-key c-mode-base-map (kbd "M-o") 'cff-find-other-file)))
(add-hook 'c-mode-hook
 '(lambda ()
 (define-key c-mode-base-map (kbd "M-o") 'cff-find-other-file)))

Algorithm

1. This command tries to find the file with the same name as current but another extension, i.e. if the current file has a .cc extension, the command will try to find other file with the same basename but the possible extensions .h, .hpp etc. and vise versa.
2. If the file is not found, it will be looked for in the subdirectories like inc and include.
3. If not found, the procedure repeats with the upper directory.
4. If still nothing found and the current VCS is git, try to search in the whole git repository.
5. If still nothing, try to find a corresponding file in git repository which contains basename as a part.

If multiple files found, present a selection to the user. When helm is enabled, present selection using helm, otherwise (or when the variable cff-use-helm-choice set to nil) use the custom mode to present selection.

The file selected once is stored in the cache; to get the selection choice again one should prefix the command, i.e. C-u M-o if the command binded to M-o.