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c113de23 GM |
1 | ;;; format-spec.el --- functions for formatting arbitrary formatting strings |
2 | ;; Copyright (C) 1999, 2000 Free Software Foundation, Inc. | |
3 | ||
4 | ;; Author: Lars Magne Ingebrigtsen <larsi@gnus.org> | |
5 | ;; Keywords: tools | |
6 | ||
7 | ;; This file is part of GNU Emacs. | |
8 | ||
9 | ;; GNU Emacs is free software; you can redistribute it and/or modify | |
10 | ;; it under the terms of the GNU General Public License as published by | |
11 | ;; the Free Software Foundation; either version 2, or (at your option) | |
12 | ;; any later version. | |
13 | ||
14 | ;; GNU Emacs is distributed in the hope that it will be useful, | |
15 | ;; but WITHOUT ANY WARRANTY; without even the implied warranty of | |
16 | ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
17 | ;; GNU General Public License for more details. | |
18 | ||
19 | ;; You should have received a copy of the GNU General Public License | |
20 | ;; along with GNU Emacs; see the file COPYING. If not, write to the | |
21 | ;; Free Software Foundation, Inc., 59 Temple Place - Suite 330, | |
22 | ;; Boston, MA 02111-1307, USA. | |
23 | ||
24 | ;;; Commentary: | |
25 | ||
26 | ;;; Code: | |
27 | ||
28 | (eval-when-compile (require 'cl)) | |
29 | ||
30 | (defun format-spec (format specification) | |
31 | "Return a string based on FORMAT and SPECIFICATION. | |
32 | FORMAT is a string containing `format'-like specs like \"bash %u %k\", | |
33 | while SPECIFICATION is an alist mapping from format spec characters | |
34 | to values." | |
35 | (with-temp-buffer | |
36 | (insert format) | |
37 | (goto-char (point-min)) | |
38 | (while (search-forward "%" nil t) | |
39 | (cond | |
40 | ;; Quoted percent sign. | |
41 | ((eq (char-after) ?%) | |
42 | (delete-char 1)) | |
43 | ;; Valid format spec. | |
44 | ((looking-at "\\([-0-9.]*\\)\\([a-zA-Z]\\)") | |
45 | (let* ((num (match-string 1)) | |
46 | (spec (string-to-char (match-string 2))) | |
47 | (val (cdr (assq spec specification)))) | |
48 | (delete-region (1- (match-beginning 0)) (match-end 0)) | |
49 | (unless val | |
50 | (error "Invalid format character: %s" spec)) | |
51 | (insert (format (concat "%" num "s") val)))) | |
52 | ;; Signal an error on bogus format strings. | |
53 | (t | |
54 | (error "Invalid format string")))) | |
55 | (buffer-string))) | |
56 | ||
57 | (defun format-spec-make (&rest pairs) | |
58 | "Return an alist suitable for use in `format-spec' based on PAIRS. | |
59 | PAIRS is a list where every other element is a character and a value, | |
60 | starting with a character." | |
61 | (let (alist) | |
62 | (while pairs | |
63 | (unless (cdr pairs) | |
64 | (error "Invalid list of pairs")) | |
65 | (push (cons (car pairs) (cadr pairs)) alist) | |
66 | (setq pairs (cddr pairs))) | |
67 | (nreverse alist))) | |
68 | ||
69 | (provide 'format-spec) | |
70 | ||
ab5796a9 | 71 | ;;; arch-tag: c22d49cf-d167-445d-b7f1-2504d4173f53 |
c113de23 | 72 | ;;; format-spec.el ends here |