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;; make-deps.el --- compute make dependencies for Elisp sources
;;
;; Copyright © Austin Clements
;;
;; This file is part of Notmuch.
;;
;; Notmuch is free software: you can redistribute it and/or modify it
;; under the terms of the GNU General Public License as published by
;; the Free Software Foundation, either version 3 of the License, or
;; (at your option) any later version.
;;
;; Notmuch 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
;; General Public License for more details.
;;
;; You should have received a copy of the GNU General Public License
;; along with Notmuch. If not, see <http://www.gnu.org/licenses/>.
;;
;; Authors: Austin Clements <aclements@csail.mit.edu>
(defun batch-make-deps ()
"Invoke `make-deps' for each file on the command line."
(setq debug-on-error t)
(dolist (file command-line-args-left)
(let ((default-directory command-line-default-directory))
(find-file-literally file))
(make-deps command-line-default-directory))
(kill-emacs))
(defun make-deps (&optional dir)
"Print make dependencies for the current buffer.
This prints make dependencies to `standard-output' based on the
top-level `require' expressions in the current buffer. Paths in
rules will be given relative to DIR, or `default-directory'."
(setq dir (or dir default-directory))
(save-excursion
(goto-char (point-min))
(condition-case nil
(while t
(let ((form (read (current-buffer))))
;; Is it a (require 'x) form?
(when (and (listp form) (= (length form) 2)
(eq (car form) 'require)
(listp (cadr form)) (= (length (cadr form)) 2)
(eq (car (cadr form)) 'quote)
(symbolp (cadr (cadr form))))
;; Find the required library
(let* ((name (cadr (cadr form)))
(fname (locate-library (symbol-name name))))
;; Is this file and the library in the same directory?
;; If not, assume it's a system library and don't
;; bother depending on it.
(when (and fname
(string= (file-name-directory (buffer-file-name))
(file-name-directory fname)))
;; Print the dependency
(princ (format "%s.elc: %s.elc\n"
(file-name-sans-extension
(file-relative-name (buffer-file-name) dir))
(file-name-sans-extension
(file-relative-name fname dir)))))))))
(end-of-file nil))))
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