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Assume I have a bunch of directories and can guarantee that no two directories have a common filename (i.e. if foo/bar exists, then bar doesn't exist in any of the other directories). How can I setup emacs such that, given a hard-coded list in .emacs of the directories to search, I can tell it to open bar and it figures out that it's in foo rather than me needing to tell it foo/bar every time? It'd be even better if it handled name collisions somehow (e.g. a list of possible matches), but that's not mandatory as I'm certain in this case the directories have no filenames in common

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up vote 4 down vote accepted

As I write this, I discover ifind-mode, which looks spot on.

(setq workspace-dir "/path/to/dir1 /path/to/dir2")
(require 'ifind-mode)
;; maybe change `ifind-command' as well

Then type M-x ifind-mode to find a file in the specified directories (and subdirectories by default), with nifty completion.

What I usually do is e **/bar from zsh (where e is an alias for emacsclient). But that's disruptive if you're in Emacs already. Also, if there's a specific file I edit often, I leave it open (and I save my session).

Out of the box, you can run M-x find-dired and specify arguments to find. But that's clumsy, at least for the case when you have a single match. ifind makes this less clumsy.

ido has a bunch of features that may be useful, especially Use ido to find any file from the project.

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That looks very handy – Faheem Mitha May 17 '11 at 21:27

I just discovered filecache, which is perfect for my purposes. There are several functions of the form file-cache-add-directory-X to add files to the cache, and then in the middle of typing a filename in find-file you can hit C-Tab to autocomplete the path using the cache (hitting it multiple times cycles through matches)

The EmacsWiki post includes functions to save/restore the cache. I wrote a cron job to generate the cache file automatically every night; the file looks like this:

(("filename" "/path/to/that/file/") ("other filename" "/different/path/"))

Then I automatically load from the cache when emacs starts using the function mentioned on EmacsWiki:

(require 'filecache)
(defun file-cache-read-cache-from-file (file)
  "Clear `file-cache-alist' and read cache from FILE.
The file cache can be saved to a file using
  (interactive "fFile: ")
  (let ((buf (find-file-noselect file)))
    (setq file-cache-alist (read buf))
    (kill-buffer buf)))

(file-cache-read-cache-from-file "~/.file-cache")
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There're couple of alternatives, e.g: recentf-mode and ido-find-file from ido package.

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