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authorDavid Robillard <d@drobilla.net>2017-12-10 14:34:27 +0100
committerDavid Robillard <d@drobilla.net>2017-12-10 14:39:53 +0100
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Make dotfiles stow compatible
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+;;; ppindent.el --- Indents C preprocessor directives
+
+;; Copyright (C) 2007 Free Software Foundation, Inc.
+
+;; Author: Craig McDaniel <craigmcd@gmail.com>
+;; Keywords: languages, c
+;; Maintainer: Craig McDaniel <craigmcd@gmail.com>
+
+;; This file 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.
+
+;; This file 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.
+
+;;; Commentary:
+
+;; PPINDENT indents C-preprocessor statements depending on the current
+;; #if..., #el.., #endif level. It only modifies lines with "#" as the
+;; first non-blank character and therefore does not conflict with the
+;; normal C indentation. Unlike a true indent, it inserts the
+;; requisite number of spaces after, rather than before the "#"
+;; character. This type of preprocesor indent is commonly used to
+;; provide the most compatibility with different C-compilers.
+;;
+;; Example:
+
+;; #ifdef WOO
+;; ....
+;; #if defined(X) && !defined(Y)
+;; #ifdef Q8
+;; ...
+;; #else
+;; ...
+;; ....
+;; #elif defined (Z)
+;; ....
+;; #endif
+;; #endif
+;; #endif
+
+;; After "M-x ppindent-c" becomes:
+
+;; #ifdef WOO
+;; ....
+;; # if defined(X) && !defined(Y)
+;; # ifdef Q8
+;; ...
+;; # else
+;; ...
+;; ....
+;; # elif defined (Z)
+;; ....
+;; # endif
+;; # endif
+;; #endif
+
+;; Two functions are provided: PPINDENT-C indents as described
+;; above. PPINDENT-H does not indent the first level, assuming that
+;; .h/.hpp files use an #ifdef guard around the entire file.
+
+;; You can customize PPINDENT-INCREMENT if you want to use something
+;; other than 2 spaces for the indent.
+
+;;; History:
+
+;; 2007-01-19 WCM Initial version
+
+;;; Code:
+
+(provide 'ppindent)
+
+(defgroup pp-indent nil
+ "Indent C preproccessor directives."
+ :group 'c)
+
+(defcustom ppindent-increment 2
+ "Number of spaces per indention level.
+
+Used in C pre-processor indent functions ppindent-c and ppindent-h"
+ :type 'number
+ :group 'pp-indent)
+
+(defun starts-withp (str prefix)
+ "str starts with prefix"
+ (eql (compare-strings prefix nil nil str nil (length prefix)) t))
+
+(defun my-make-string (length init)
+ "just like make-string, but makes an empty string if length is negative"
+ (when (minusp length)
+ (setf length 0))
+ (make-string length init))
+
+(defun ppindent-aux (start)
+ (let ((cnt start))
+ (goto-char (point-min))
+ (while (re-search-forward "^[ \t]*#[ \t]*\\(.*\\)" nil t)
+ (cond ((starts-withp (match-string-no-properties 1) "if")
+ (replace-match (concat "#" (my-make-string cnt ?\s) "\\1"))
+ (incf cnt ppindent-increment))
+ ((starts-withp (match-string-no-properties 1) "el")
+ (when (< (- cnt ppindent-increment) start)
+ (throw 'err `(,(line-number-at-pos) "Unmatched #else or #elif")))
+ (replace-match (concat "#" (my-make-string
+ (- cnt ppindent-increment)
+ ?\s) "\\1")))
+ ((starts-withp (match-string-no-properties 1) "endif")
+ (when (< (- cnt ppindent-increment) start)
+ (throw 'err `(,(line-number-at-pos) "Unmatched #endif")))
+ (decf cnt ppindent-increment)
+ (replace-match (concat "#" (my-make-string cnt ?\s) "\\1")))
+ (t
+ (replace-match (concat "#" (my-make-string cnt ?\s) "\\1")))))))
+
+(defun ppindent-buffer (start)
+ (let ((result (catch 'err (save-excursion (ppindent-aux start)))))
+ (when result
+ (goto-line (car result))
+ (error "Error: %s" (cadr result)))))
+
+(defun ppindent-c ()
+ "Indent all C pre-processor statements"
+ (interactive)
+ (ppindent-buffer 0))
+
+(defun ppindent-h ()
+ "Indent C pre-processor statements, keeping first level #ifdef unindented"
+ (interactive)
+ (ppindent-buffer (- ppindent-increment)))
+