[HOOK] Fix leading and trailing whitespace

[OndÅej BÃlka <neleai at seznam dot cz>]

Hi,

As I noticed problem of patches with trailing whitespaces I 
decided to use a pre commit hook to solve this problem once for all.

I wrote a simplified c parser below:

If you also want to use it add

./scripts/fix_leading_trailing_space_git to .git/hooks/pre-commit

As regenerated files need to remove these would it be possible to
automaticaly run this script after generation?

Comments?

---
 scripts/fix_leading_trailing_space.c   |  101 ++++++++++++++++++++++++++++++++
 scripts/fix_leading_trailing_space_git |   21 +++++++
 2 files changed, 122 insertions(+)
 create mode 100644 scripts/fix_leading_trailing_space.c
 create mode 100755 scripts/fix_leading_trailing_space_git

diff --git a/scripts/fix_leading_trailing_space.c b/scripts/fix_leading_trailing_space.c
new file mode 100644
index 0000000..de48156
--- /dev/null
+++ b/scripts/fix_leading_trailing_space.c
@@ -0,0 +1,101 @@
+/* Copyright (C) 1991-2013 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library 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
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+#include <stdio.h>
+#include <ctype.h>
+#include <string.h>
+#define isalnum_(x) (isalnum (x) || x == '_')
+#define cmp(x, y) memcmp (x, y, strlen (y))
+int
+main ()
+{
+  int i, j, k, len;
+  int incomment = 0, incomment2, insquote = 0, indquote = 0;
+  char _buffer[100000], *buffer = _buffer + 1;
+  char buffer2[100000];
+  _buffer[0] = ' ';
+  while (fgets (buffer, 100000, stdin))
+    {
+      i = 0;
+      j = 0;
+      len = 0;
+      if (!insquote && !indquote)
+	{
+	  while (buffer[i] && isspace (buffer[i]))
+	    {
+	      if (buffer[i] == ' ')
+		len++;
+	      if (buffer[i] == '\t')
+		len = 8 * (len / 8) + 8;
+	      i++;
+	    }
+	  for (k = 0; k < len / 8; k++)
+	    buffer2[j++] = '\t';
+	  for (k = 0; k < len % 8; k++)
+	    buffer2[j++] = ' ';
+	}
+      while (buffer[i])
+	{
+	  if (!cmp (buffer + i, "/*"))
+	    incomment = 1;
+	  if (!cmp (buffer + i, "//"))
+	    incomment2 = 1;
+
+	  if (incomment)
+	    {
+	      if (!cmp (buffer + i, "*/"))
+		incomment = 0;
+	    }
+	  else if (incomment2)
+	    {
+	      if (buffer[i] != '\\' && buffer[i + 1] == '\n')
+		incomment2 = 0;
+	    }
+	  else
+	    {
+	      if (insquote)
+		{
+		  if (buffer[i - 1] != '\\' && buffer[i] == '\'')
+		    insquote = 0;
+		}
+	      else if (indquote)
+		{
+		  if (buffer[i - 1] != '\\' && buffer[i] == '"')
+		    indquote = 0;
+		}
+	      else
+		{
+		  if (buffer[i] == '\'')
+		    insquote = 1;
+		  if (buffer[i] == '"')
+		    indquote = 1;
+		}
+	    }
+	  buffer2[j++] = buffer[i++];
+	}
+      if (!insquote && !indquote)
+	{
+	  while (--j >= 0 && isspace (buffer2[j]))
+	    ;
+	  buffer2[j + 1] = '\n';
+	  j += 2;
+	}
+      buffer2[j] = 0;
+      printf ("%s", buffer2);
+    }
+  return 0;
+}
diff --git a/scripts/fix_leading_trailing_space_git b/scripts/fix_leading_trailing_space_git
new file mode 100755
index 0000000..b654189
--- /dev/null
+++ b/scripts/fix_leading_trailing_space_git
@@ -0,0 +1,16 @@
+#!/bin/bash
+
+DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )"
+
+for CUP in fix_leading_trailing_space; do
+	
+	gcc $DIR/$CUP.c -o $DIR/$CUP
+
+	for I in `git diff --name-only HEAD`; do
+		if [ ${I: -2} == ".c" ] || [ ${I: -2} == ".h" ]; then
+
+			$DIR/$CUP <$I >$I.tmp
+	    mv $I.tmp $I
+		fi
+	done
+done
-- 
1.7.10.4