Add script for formatting cmake files

The prefered call order is

  tools/cmake-format --trailing-spaces
  # create git commit
  tools/cmake-format --tabs
  # create git commit
  tools/cmake-format --keyword-case
  # create git commit
  tools/cmake-format --keyword-spaces
  # create git commit
  tools/cmake-format --end-args
  # create git commit
  tools/cmake-format --indents
  # create git commit

Signed-off-by: Ralf Habacker <ralf.habacker@freenet.de>

diff --git a/tools/cmake-format b/tools/cmake-format
new file mode 100755 (executable)
index 0000000..303f674
--- /dev/null
+++ b/tools/cmake-format
@@ -0,0 +1,109 @@
+#!/bin/sh
+#
+# cmake-format - a simple cmake formatter
+#
+# Copyright (c) 2019 Ralf Habacker <ralf.habacker@freenet.de>
+#
+# SPDX-License-Identifier: BSD
+#
+# Redistribution and use is allowed according to the terms of the BSD license.
+#
+
+if test -z "$1"; then
+       echo "format cmake files                                                                   by Ralf Habacker"
+       echo
+       echo "Usage: $0  --all | --end-args | --indents | --keyword-case | --keyword-spaces | --tabs | --trailing-spaces"
+       echo
+       echo "command line parameter:"
+       echo "   --all               all above"
+       echo "   --end-args          remove obsolete parameter list from end... cmake commands"
+       echo "   --indents           fix indents (requires keyword-case)"
+       echo "   --keyword-case      make all cmake keywords lowercase"
+       echo "   --keyword-spaces    remove spaces between keyword and opening bracket"
+       echo "   --tabs              replace tabs by 4 spaces"
+       echo "   --trailing-spaces   remove trailing spaces"
+       exit 1
+fi
+
+# only apply to cmake keywords
+KEYWORDS=$(cmake --help-command-list)
+
+# do not search in comments
+range="/^[ ]*#/!"
+
+# use 4 spaces
+indent="\ \ \ \ "
+
+# remove tabs
+exp="${range}s/\t/${indent}/g"
+expt=$exp
+
+# remove trailing spaces
+exp="${range}s/[ \t]*$//"
+expts=$exp
+
+# fix indents
+exp=
+for j in $(echo $KEYWORDS); do
+       exp="$exp;${range}s/^ \{1,3\}$j(/${indent}$j(/g"
+       exp="$exp;${range}s/^ \{5,7\}$j(/${indent}${indent}$j(/g"
+       exp="$exp;${range}s/^ \{9,11\}$j(/${indent}${indent}${indent}$j(/g"
+done
+expki=$exp
+
+# convert upper case keywords to lower case
+exp=
+for j in $(echo $KEYWORDS); do
+       u=$(echo $j | sed 's/.*/\U&/')
+       exp="$exp;${range}s/$u[ \t]*(/$j(/g"
+done
+expku=$exp
+
+# remove spaces after keywords and (
+exp=
+for j in $(echo $KEYWORDS); do
+       exp="$exp;${range}s/$j[ \t]\+(/$j(/g"
+done
+expks=$exp
+
+# remove obsolete arguments from end...()
+exp=
+for j in $(echo $KEYWORDS); do
+       e=$(echo $j | grep '^end')
+       if test -n "$e"; then
+               exp="$exp;${range}s/$j(.*)/$j()/g"
+       fi
+done
+expke=$exp
+
+if test "$1" == "--all"; then
+       exp="${expt}${expts}${expku}${expki}${expks}${expke}"
+elif test "$1" == "--end-args"; then
+       exp=$expke
+elif test "$1" == "--indents"; then
+       exp=$expki
+elif test "$1" == "--keyword-case"; then
+       exp=$expku
+elif test "$1" == "--keyword-spaces"; then
+       exp=$expks
+elif test "$1" == "--tabs"; then
+       exp=$expt
+elif test "$1" == "--trailing-spaces"; then
+       exp=$expts
+fi
+
+# setup dir to apply
+s=$(dirname $0)
+root=$(realpath $s/../cmake)
+
+#echo $exp
+#echo $root
+
+echo "locations with unusual indention level changes, please inspect"
+# apply to cmake related files
+for i in $(find $root -name 'CMakeLists.txt' -o -name '*.cmake' | grep -v README.cmake | grep -v config.h.cmake | grep -v bat.cmake | grep -v '/Find'); do
+       # apply style
+       sed -i "$exp" $i
+       # show unusual indention changes
+       gawk 'BEGIN { indent=0 } $0 ~ /^ {0}/ && $0 !~ /^$/{ indent=0; }  $0 ~ /^ {4}/ { indent=1; } $0 ~ /^ {8}/ { indent=2; } $0 ~ /^ {12}/ { indent=3; } {  if (indent - oldindent > 1) print FILENAME ":" NR ":" $0; oldindent=indent;}' $i
+done