| 1 | ;;; ppexpand.el --- temporarily expanding macros in a pretty way. |
| 2 | |
| 3 | ;; Copyright (C) 2000, 2006 Free Software Foundation, Inc. |
| 4 | |
| 5 | ;;;; This library is free software; you can redistribute it and/or |
| 6 | ;;;; modify it under the terms of the GNU Lesser General Public |
| 7 | ;;;; License as published by the Free Software Foundation; either |
| 8 | ;;;; version 3 of the License, or (at your option) any later version. |
| 9 | ;;;; |
| 10 | ;;;; This library is distributed in the hope that it will be useful, |
| 11 | ;;;; but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 12 | ;;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 13 | ;;;; Lesser General Public License for more details. |
| 14 | ;;;; |
| 15 | ;;;; You should have received a copy of the GNU Lesser General Public |
| 16 | ;;;; License along with this library; if not, write to the Free |
| 17 | ;;;; Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA |
| 18 | ;;;; 02111-1307 USA |
| 19 | |
| 20 | ;;; Author: Mikael Djurfeldt <djurfeldt@nada.kth.se> |
| 21 | |
| 22 | ;;; Commentary: |
| 23 | |
| 24 | ;; Commands for editing multiline ANSI C compatible string literals. |
| 25 | |
| 26 | ;;; Code: |
| 27 | (require 'cmacexp) |
| 28 | |
| 29 | (defvar if-mark "#if 0 /* PPEXPAND */") |
| 30 | (defvar else-mark "#else /* PPEXPAND */") |
| 31 | (defvar endif-mark "#endif /* PPEXPAND */") |
| 32 | |
| 33 | (define-key c-mode-map "\C-ce" 'ppexpand) |
| 34 | |
| 35 | (defun ppexpand (start end &optional undo) |
| 36 | "Expand C macros in the region, using the C preprocessor. |
| 37 | The expanded code is run through the `indent' command and inserted |
| 38 | into the program next to the original code, using an #if/#else/#endif |
| 39 | construct. |
| 40 | |
| 41 | Given a prefix argument, it reverts the change, removing the |
| 42 | #if/#else/#endif construct and the expanded code. |
| 43 | |
| 44 | `c-macro-preprocessor' specifies the preprocessor to use. |
| 45 | Prompt for arguments to the preprocessor \(e.g. `-DDEBUG -I ./include') |
| 46 | if the user option `c-macro-prompt-flag' is non-nil. |
| 47 | |
| 48 | Noninteractive args are START, END, UNDO. |
| 49 | For use inside Lisp programs, see also `c-macro-expansion'." |
| 50 | |
| 51 | (interactive (if current-prefix-arg |
| 52 | (list nil nil t) |
| 53 | (let ((pos1 (point)) |
| 54 | (pos2 (mark))) |
| 55 | (if (< pos1 pos2) |
| 56 | (list pos1 pos2 nil) |
| 57 | (list pos2 pos1 nil))))) |
| 58 | (let ((inbuf (current-buffer))) |
| 59 | ;; Build the command string. |
| 60 | (if c-macro-prompt-flag |
| 61 | (setq c-macro-cppflags |
| 62 | (read-string "Preprocessor arguments: " |
| 63 | c-macro-cppflags))) |
| 64 | (if undo |
| 65 | (let ((pos (point)) if-pos else-pos endif-pos) |
| 66 | (save-excursion |
| 67 | (end-of-line) |
| 68 | (if (not (and (setq if-pos (search-backward if-mark nil t)) |
| 69 | (setq else-pos (search-forward else-mark nil t)) |
| 70 | (setq endif-pos (search-forward endif-mark nil t)) |
| 71 | (<= if-pos pos) |
| 72 | (< pos endif-pos))) |
| 73 | (error "Not in ppexpanded region")) |
| 74 | (let ((orig (buffer-substring (+ if-pos (length if-mark) 1) |
| 75 | (- else-pos (length else-mark))))) |
| 76 | (delete-region if-pos (+ endif-pos 1)) |
| 77 | (insert orig)))) |
| 78 | ;; Expand the macro. |
| 79 | (let* ((expansion (c-macro-expansion start end |
| 80 | (concat c-macro-preprocessor " " |
| 81 | c-macro-cppflags) t)) |
| 82 | (orig (buffer-substring start end))) |
| 83 | (setq expansion |
| 84 | (with-temp-buffer |
| 85 | (insert expansion) |
| 86 | (call-process-region (point-min) (point-max) "indent" |
| 87 | t ;delete the text |
| 88 | t ;output --> current buffer |
| 89 | ) |
| 90 | (buffer-string))) |
| 91 | (delete-region start end) |
| 92 | (insert if-mark ?\n orig else-mark ?\n expansion endif-mark ?\n))))) |