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+;;; make-mms-derivative.el --- framework to do horrible things for VMS support
+
+;; Copyright (C) 2005 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 2005, 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