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emacs-directories.el
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emacs-directories.el
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;;; emacs-directories -- Pascal J. Bourguignon's emacs startup files.
;;; -*- mode:emacs-lisp;lexical-binding:t;coding:utf-8 -*-
;;; Commentary:
;;; Code:
;;;;**************************************************************************
;;;;FILE: emacs-directories.el
;;;;LANGUAGE: emacs lisp
;;;;SYSTEM: POSIX
;;;;USER-INTERFACE: NONE
;;;;DESCRIPTION
;;;;
;;;; Query the directory.txt database.
;;;;
;;;;AUTHORS
;;;; <PJB> Pascal J. Bourguignon <pjb@informatimago.com>
;;;;MODIFICATIONS
;;;; 2015-08-20 <PJB> Extracted from emacs-common.el
;;;;BUGS
;;;;LEGAL
;;;; AGPL3
;;;;
;;;; Copyright Pascal J. Bourguignon 2015 - 2015
;;;;
;;;; This program is free software: you can redistribute it and/or modify
;;;; it under the terms of the GNU Affero General Public License as published by
;;;; the Free Software Foundation, either version 3 of the License, or
;;;; (at your option) any later version.
;;;;
;;;; This program is distributed in the hope that it will be useful,
;;;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
;;;; GNU Affero General Public License for more details.
;;;;
;;;; You should have received a copy of the GNU Affero General Public License
;;;; along with this program. If not, see <http://www.gnu.org/licenses/>.
;;;;**************************************************************************
;;;----------------------------------------------------------------------------
;;; File and directory stuff
;;;----------------------------------------------------------------------------
(defvar *directories* '() "A cache for the ~/directories.txt dictionary.")
;; (setf *directories* '())
(defun load-directories (&optional directories-file)
"Loads ~/directories.txt (or the given DIRECTORIES-FILE),
and stores it in `*directories*'.
"
(let ((directories-file (or directories-file "~/directories.txt")))
(setf *directories*
(progn
(find-file directories-file)
(prog1
(loop
for (k v)
on (split-string (buffer-substring-no-properties
(point-min) (point-max)))
by (function cddr)
nconc (list (intern (format ":%s" (substitute ?- ?_ (downcase k))))
v))
(kill-buffer (current-buffer)))))))
(defun get-directory (key &optional subpath)
"
RETURN: The directory in ~/directories.txt for the key, concatenated with the subpath.
NOTE: ~/directories.txt is cached in *directories*.
"
(unless *directories*
(load-directories))
(when (getf *directories* key)
(let ((dir (getf *directories* key)))
(if (or (null subpath) (string= "" subpath))
dir
(flet ((lastchar (str) (and (< 0 (length str)) (aref str (1- (length str)))))
(firstchar (str) (and (< 0 (length str)) (aref str 0)))
(xor (a b) (or (and a (not b)) (and (not a) b))))
(if (xor (eql ?/ (lastchar dir)) (eql ?/ (firstchar subpath)))
(concat dir subpath)
(concat dir "/" subpath)))))))
;; Local Variables:
;; coding: utf-8
;; eval: (flycheck-mode -1)
;; End: