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1 | ;;; make-mms-derivative.el --- framework to do horrible things for VMS support |
2 | ||
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3 | ;; Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008 |
4 | ;; Free Software Foundation, Inc. | |
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5 | |
6 | ;; Author: Thien-Thi Nguyen <ttn@gnu.org> | |
7 | ;; Keywords: maint build vms mms makefile levitte autoconf war-is-a-lose | |
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8 | |
9 | ;; This file is part of GNU Emacs. | |
10 | ||
6f2de1fa | 11 | ;; GNU Emacs is free software: you can redistribute it and/or modify |
ad80578f | 12 | ;; it under the terms of the GNU General Public License as published by |
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13 | ;; the Free Software Foundation, either version 3 of the License, or |
14 | ;; (at your option) any later version. | |
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15 | |
16 | ;; GNU Emacs is distributed in the hope that it will be useful, | |
17 | ;; but WITHOUT ANY WARRANTY; without even the implied warranty of | |
18 | ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
19 | ;; GNU General Public License for more details. | |
20 | ||
21 | ;; You should have received a copy of the GNU General Public License | |
6f2de1fa | 22 | ;; along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>. |
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23 | |
24 | ;;; Commentary: | |
25 | ||
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26 | ;; Under VMS the standard make-like program is called MMS, which looks |
27 | ;; for an input file in the default directory named DESCRIP.MMS and runs | |
28 | ;; the DCL command rules therein. As of 2005, the build process | |
29 | ;; requires a hand translation of the Makefile.in and Emacs-specific | |
30 | ;; methodology to DCL and TPU commands, so to alleviate this pain, we | |
31 | ;; provide `make-mms-derivative', which given a source FILENAME, inserts | |
32 | ;; the file contents in a new buffer and loads FILENAME-2mms. The lisp | |
33 | ;; code in the -2mms file can (do whatever -- it's emacs -- and), as | |
34 | ;; long as it arranges to write out the modified buffer after loading by | |
35 | ;; specifying, on a line of its own, the directive: | |
ad80578f | 36 | ;; |
25624973 | 37 | ;; :output RELATIVE-OUTPUT |
ad80578f | 38 | ;; |
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39 | ;; where RELATIVE-OUTPUT is a filename (a string) relative to FILENAME's |
40 | ;; directory, typically something simple like "descrip.mms_in_in". Only | |
41 | ;; the first :output directive is recognized. | |
42 | ;; | |
43 | ;; The only other special directive at this time has the form: | |
44 | ;; | |
45 | ;; :gigo NAME | |
46 | ;; ;;blah blah blah | |
47 | ;; ;;(more text here) | |
48 | ;; | |
49 | ;; NAME is anything distinguishable w/ `eq' (number, symbol or keyword). | |
50 | ;; This associates NAME with the block of text starting immediately below | |
51 | ;; the :gigo directive and ending at the first line that does not begin | |
52 | ;; with two semicolons (which are stripped from each line in the block). | |
53 | ;; To insert this block of text, pass NAME to `make-mms-derivative-gigo'. | |
54 | ;; | |
55 | ;; Directives are scanned before normal evaluation, so their placement | |
56 | ;; in the file is not important. During loading, plain strings are | |
57 | ;; displayed in the echo area, prefixed with the current line number. | |
58 | ;; | |
59 | ;; Over the long run, the convenience functions provided (see source) | |
9e5cf80a | 60 | ;; will be augmented by factoring maximally the -2mms files, squeezing |
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61 | ;; as much algorithm out of those nasty heuristics as possible. What |
62 | ;; makes them nasty is not that they rely on the conventions of the | |
63 | ;; Emacs makefiles; that's no big deal. What makes them nasty is that | |
64 | ;; they rely on the conventions of separately maintained tools (namely | |
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65 | ;; Autoconf for VMS and GNU Autoconf), and the separation of conventions |
66 | ;; is how people drift apart, dragging their software behind | |
67 | ;; mercilessly. | |
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68 | ;; |
69 | ;; In general, codified thought w/o self-synchronization is doomed. | |
70 | ;; That a generation would eat its young (most discriminatingly, even) | |
71 | ;; is no reason GNU cannot build around such woe. | |
72 | ||
73 | ;;; Code: | |
74 | ||
ad80578f | 75 | (defvar make-mms-derivative-data nil |
25624973 | 76 | "Plist of data specific to `make-mms-derivative'.") |
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77 | |
78 | (defun make-mms-derivative-data (key &optional newval) | |
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79 | (if newval (setq make-mms-derivative-data |
80 | (plist-put make-mms-derivative-data key newval)) | |
81 | (plist-get make-mms-derivative-data key))) | |
82 | ||
83 | (defun make-mms-derivative-gigo (name) | |
84 | "Insert the text associated with :gigo NAME." | |
85 | (insert (cdr (assq name (make-mms-derivative-data :gigo))))) | |
86 | ||
87 | (defun make-mms-derivative (filename) | |
88 | "Take FILENAME contents, load FILENAME-2mms, and write out the result. | |
89 | The output file is specified by the :output directive in FILENAME-2mms. | |
90 | See commentary of make-mms-derivative.el for full documentation." | |
ad80578f | 91 | (interactive "fSource File: ") |
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92 | (let* ((todo (let ((fn (concat filename "-2mms"))) |
93 | (unless (file-exists-p fn) | |
94 | (error "Could not find %s" fn)) | |
95 | (set-buffer (get-buffer-create " *make-mms-derivative todo*")) | |
96 | (insert-file-contents fn) | |
97 | (current-buffer))) | |
98 | (deriv (get-buffer-create (format "*mms-derivative: %s" | |
99 | (file-relative-name filename)))) | |
100 | output gigo form) | |
101 | (set-buffer todo) | |
102 | (re-search-forward "^:output") | |
103 | (setq output (expand-file-name (read (current-buffer)) | |
104 | (file-name-directory filename))) | |
105 | (goto-char (point-min)) | |
106 | (while (re-search-forward "^:gigo" (point-max) t) | |
107 | (let ((name (read (current-buffer))) | |
108 | (p (progn (forward-line 1) (point)))) | |
109 | (while (looking-at ";;") | |
110 | (delete-char 2) | |
111 | (forward-line 1)) | |
112 | (setq gigo (cons (cons name (buffer-substring p (point))) gigo)) | |
113 | (delete-region p (point)))) | |
114 | (message "Munging...") | |
115 | (switch-to-buffer deriv) | |
116 | (erase-buffer) | |
117 | (insert-file-contents filename) | |
118 | (set (make-local-variable 'make-mms-derivative-data) | |
119 | (list :gigo gigo)) | |
120 | (set-buffer todo) | |
121 | (goto-char (point-min)) | |
122 | (while (condition-case nil | |
123 | (setq form (read (current-buffer))) | |
124 | (end-of-file nil)) | |
125 | (if (stringp form) | |
126 | (message "%d: %s" (count-lines (point-min) (point)) form) | |
127 | (save-excursion | |
128 | (set-buffer deriv) | |
129 | (eval form)))) | |
130 | (set-buffer deriv) | |
131 | (message "Munging...done") | |
132 | (write-file output) | |
133 | (kill-buffer todo) | |
134 | (kill-buffer deriv))) | |
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135 | |
136 | (provide 'make-mms-derivative) | |
137 | ||
6f2de1fa | 138 | ;; arch-tag: a5b08625-3952-4053-be16-296220e27bb0 |
ad80578f | 139 | ;;; make-mms-derivative.el ends here |