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-;;; ppexpand.el --- temporarily expanding macros in a pretty way.
-
-;; Copyright (C) 2000 Free Software Foundation, Inc.
-
-;; 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.
-
-;;; Author: Mikael Djurfeldt <djurfeldt@nada.kth.se>
-
-;;; Commentary:
-
-;; Commands for editing multiline ANSI C compatible string literals.
-
-;;; Code:
-(require 'cmacexp)
-
-(defvar if-mark "#if 0 /* PPEXPAND */")
-(defvar else-mark "#else /* PPEXPAND */")
-(defvar endif-mark "#endif /* PPEXPAND */")
-
-(define-key c-mode-map "\C-ce" 'ppexpand)
-
-(defun ppexpand (start end &optional undo)
- "Expand C macros in the region, using the C preprocessor.
-The expanded code is run through the `indent' command and inserted
-into the program next to the original code, using an #if/#else/#endif
-construct.
-
-Given a prefix argument, it reverts the change, removing the
-#if/#else/#endif construct and the expanded code.
-
-`c-macro-preprocessor' specifies the preprocessor to use.
-Prompt for arguments to the preprocessor \(e.g. `-DDEBUG -I ./include')
-if the user option `c-macro-prompt-flag' is non-nil.
-
-Noninteractive args are START, END, UNDO.
-For use inside Lisp programs, see also `c-macro-expansion'."
-
- (interactive (if current-prefix-arg
- (list nil nil t)
- (let ((pos1 (point))
- (pos2 (mark)))
- (if (< pos1 pos2)
- (list pos1 pos2 nil)
- (list pos2 pos1 nil)))))
- (let ((inbuf (current-buffer)))
- ;; Build the command string.
- (if c-macro-prompt-flag
- (setq c-macro-cppflags
- (read-string "Preprocessor arguments: "
- c-macro-cppflags)))
- (if undo
- (let ((pos (point)) if-pos else-pos endif-pos)
- (save-excursion
- (end-of-line)
- (if (not (and (setq if-pos (search-backward if-mark nil t))
- (setq else-pos (search-forward else-mark nil t))
- (setq endif-pos (search-forward endif-mark nil t))
- (<= if-pos pos)
- (< pos endif-pos)))
- (error "Not in ppexpanded region"))
- (let ((orig (buffer-substring (+ if-pos (length if-mark) 1)
- (- else-pos (length else-mark)))))
- (delete-region if-pos (+ endif-pos 1))
- (insert orig))))
- ;; Expand the macro.
- (let* ((expansion (c-macro-expansion start end
- (concat c-macro-preprocessor " "
- c-macro-cppflags) t))
- (orig (buffer-substring start end)))
- (setq expansion
- (with-temp-buffer
- (insert expansion)
- (call-process-region (point-min) (point-max) "indent"
- t ;delete the text
- t ;output --> current buffer
- )
- (buffer-string)))
- (delete-region start end)
- (insert if-mark ?\n orig else-mark ?\n expansion endif-mark ?\n)))))