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;;; make-mms-derivative.el --- framework to do horrible things for VMS support
;; Copyright (C) 2003 Free Software Foundation, Inc.
;; Author: Thien-Thi Nguyen <ttn@gnu.org>
;; Keywords: maint build vms mms makefile levitte autoconf war-is-a-lose
;; This file is part of GNU Emacs.
;; GNU Emacs 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 2, or (at your option)
;; any later version.
;; GNU Emacs 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 GNU Emacs; see the file COPYING. If not, write to the
;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
;; Boston, MA 02111-1307, USA.
;;; Commentary:
;; Under OpenVMS the standard make-like program is called MMS, which
;; looks for an input file in the default directory named DESCRIP.MMS
;; and runs the DCL command rules therein. As of 2003, the build
;; process requires a hand translation of the Makefile.in and related
;; Emacs-specific methodology to DCL and TPU commands, so to alleviate
;; this pain, we provide `make-mms-derivative', which given a source
;; FILENAME (under `make-mms-derivative-root-dir'), inserts the file
;; contents in a new buffer and loads FILENAME-2mms. The elisp in the
;; -2mms file can (do whatever -- it's emacs -- and) arrange to write
;; out the modified buffer after FILENAME-2mms loading by using:
;;
;; (make-mms-derivative-data 'write-under-root RELATIVE-FILENAME)
;;
;; where RELATIVE-FILENAME is something like "src/descrip.mms_in_in".
;; Over the long run, the convenience procedures provided (see source)
;; will be augmented by factoring maximally the -2mms files, squeezing
;; as much algorithm out of those nasty heuristics as possible. What
;; makes them nasty is not that they rely on the conventions of the
;; Emacs makefiles; that's no big deal. What makes them nasty is that
;; they rely on the conventions of separately maintained tools (namely
;; Autoconf 1.11 under OpenVMS and the rest of GNU), and the separation
;; of conventions is how people drift apart, dragging their software
;; behind mercilessly.
;;
;; In general, codified thought w/o self-synchronization is doomed.
;; That a generation would eat its young (most discriminatingly, even)
;; is no reason GNU cannot build around such woe.
;;; Code:
(defvar make-mms-derivative-root-dir "AXPA:[TTN.EMACS.EMACS212_3]"
"Source tree root directory.")
(defvar make-mms-derivative-data nil
"Alist of data specific to `make-mms-derivative'.")
(defun make-mms-derivative-data (key &optional newval)
(if newval
(setq make-mms-derivative-data
(cons (cons key newval) make-mms-derivative-data))
(cdr (assq key make-mms-derivative-data))))
(defmacro make-mms-derivative-progn (msg &rest body)
`(progn
(message "(%s) %s" (point) ,msg)
,@body))
(put 'make-mms-derivative-progn 'lisp-indent-function 1)
(defun make-mms-derivative-load-edits-file (name)
(make-mms-derivative-data 'edits-filename name)
(let (raw-data
(cur (current-buffer))
(wbuf (get-buffer-create "*make-mms-derivative-load-edits-file work")))
(set-buffer wbuf)
(insert-file-contents name)
(keep-lines "^;;;[0-9]+;;")
(goto-char (point-max))
(while (re-search-backward "^;;;\\([0-9]+\\);;\\(.*\\)$" (point-min) t)
(let* ((i (string-to-number (match-string 1)))
(line (match-string 2))
(look (assq i raw-data)))
(if look
(setcdr look (cons line (cdr look)))
(setq raw-data (cons (list i line) raw-data)))))
(kill-buffer wbuf)
(set-buffer cur)
(mapcar (lambda (ent)
(setcdr ent (mapconcat (lambda (line)
(concat line "\n"))
(cdr ent)
"")))
raw-data)
(make-mms-derivative-data 'raw-data raw-data))
(load name))
(defun make-mms-derivative-insert-raw-data (n)
(insert (cdr (assq n (make-mms-derivative-data 'raw-data)))))
(defun make-mms-derivative (file)
(interactive "fSource File: ")
(let ((root (expand-file-name make-mms-derivative-root-dir))
(file (expand-file-name file)))
(when (file-name-absolute-p (file-relative-name file root))
(error "Not under root (%s)" root))
(let ((edits-filename (concat file "-2mms")))
(unless (file-exists-p edits-filename)
(error "Could not find %s" edits-filename))
(let ((buf (get-buffer-create
(format "*mms-derivative: %s"
(file-relative-name file root)))))
(message "Munging ...")
(switch-to-buffer buf)
(erase-buffer)
(make-variable-buffer-local 'make-mms-derivative-data)
(insert-file file)
(make-mms-derivative-load-edits-file edits-filename)
(let ((out (make-mms-derivative-data 'write-under-root)))
(when out
(write-file
(expand-file-name rel-filename make-mms-derivative-root-dir)))
(kill-buffer buf)
(unless out (message "Munging ... done")))))))
(provide 'make-mms-derivative)
;;; arch-tag: a5b08625-3952-4053-be16-296220e27bb0
;;; make-mms-derivative.el ends here
|
