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72 lines
2.4 KiB
EmacsLisp
72 lines
2.4 KiB
EmacsLisp
;;; format-spec.el --- functions for formatting arbitrary formatting strings
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;; Copyright (C) 1999, 2000 Free Software Foundation, Inc.
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;; Author: Lars Magne Ingebrigtsen <larsi@gnus.org>
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;; Keywords: tools
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;; This file is part of GNU Emacs.
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;; GNU Emacs is free software; you can redistribute it and/or modify
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;; it under the terms of the GNU General Public License as published by
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;; the Free Software Foundation; either version 2, or (at your option)
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;; any later version.
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;; GNU Emacs is distributed in the hope that it will be useful,
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;; but WITHOUT ANY WARRANTY; without even the implied warranty of
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;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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;; GNU General Public License for more details.
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;; You should have received a copy of the GNU General Public License
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;; along with GNU Emacs; see the file COPYING. If not, write to the
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;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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;; Boston, MA 02111-1307, USA.
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;;; Commentary:
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;;; Code:
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(eval-when-compile (require 'cl))
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(defun format-spec (format specification)
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"Return a string based on FORMAT and SPECIFICATION.
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FORMAT is a string containing `format'-like specs like \"bash %u %k\",
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while SPECIFICATION is an alist mapping from format spec characters
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to values."
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(with-temp-buffer
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(insert format)
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(goto-char (point-min))
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(while (search-forward "%" nil t)
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(cond
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;; Quoted percent sign.
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((eq (char-after) ?%)
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(delete-char 1))
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;; Valid format spec.
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((looking-at "\\([-0-9.]*\\)\\([a-zA-Z]\\)")
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(let* ((num (match-string 1))
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(spec (string-to-char (match-string 2)))
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(val (cdr (assq spec specification))))
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(delete-region (1- (match-beginning 0)) (match-end 0))
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(unless val
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(error "Invalid format character: %s" spec))
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(insert (format (concat "%" num "s") val))))
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;; Signal an error on bogus format strings.
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(t
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(error "Invalid format string"))))
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(buffer-string)))
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(defun format-spec-make (&rest pairs)
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"Return an alist suitable for use in `format-spec' based on PAIRS.
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PAIRS is a list where every other element is a character and a value,
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starting with a character."
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(let (alist)
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(while pairs
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(unless (cdr pairs)
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(error "Invalid list of pairs"))
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(push (cons (car pairs) (cadr pairs)) alist)
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(setq pairs (cddr pairs)))
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(nreverse alist)))
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(provide 'format-spec)
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;;; format-spec.el ends here
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