Import guile-1.8 as multiple upstream tarball component

[lilypond.git] / guile18 / emacs / ppexpand.el

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+;;; ppexpand.el --- temporarily expanding macros in a pretty way.
+
+;; Copyright (C) 2000, 2006 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)))))