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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., 51 Franklin Street, Fifth Floor,
;; Boston, MA 02110-1301, 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)))))
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