#!/bin/bash

 YEAR=`date +2003-%Y`

 HGROOT=`hg root`

 # file enumaration modes

 function all_files() {

     hg status -a -m -c |

     cut -d ' ' -f 2 | grep -E '(\.(cc|h|dox)$|Makefile\.am$)' |

     while read file; do echo $HGROOT/$file; done

 }

 function modified_files() {

     hg status -a -m |

     cut -d ' ' -f 2 | grep -E  '(\.(cc|h|dox)$|Makefile\.am$)' |

     while read file; do echo $HGROOT/$file; done

 }

 function changed_files() {

     {

         if [ -n "$HG_PARENT1" ]

         then

             hg status --rev $HG_PARENT1:$HG_NODE -a -m

         fi

         if [ -n "$HG_PARENT2" ]

         then

             hg status --rev $HG_PARENT2:$HG_NODE -a -m

         fi

     } | cut -d ' ' -f 2 | grep -E '(\.(cc|h|dox)$|Makefile\.am$)' | 

     sort | uniq |

     while read file; do echo $HGROOT/$file; done

 }

 function given_files() {

     for file in $GIVEN_FILES

     do

 	echo $file

     done

 }

 # actions

 function update_action() {

     if ! diff -q $1 $2 >/dev/null

     then

 	echo -n " [$3 updated]"

 	rm $2

 	mv $1 $2

 	CHANGED=YES

     fi

 }

 function update_warning() {

     echo -n " [$2 warning]"

     WARNED=YES

 }

 function update_init() {

     echo Update source files...

     TOTAL_FILES=0

     CHANGED_FILES=0

     WARNED_FILES=0

 }

 function update_done() {

     echo $CHANGED_FILES out of $TOTAL_FILES files has been changed.

     echo $WARNED_FILES out of $TOTAL_FILES files triggered warnings.

 }

 function update_begin() {

     ((TOTAL_FILES++))

     CHANGED=NO

     WARNED=NO

 }

 function update_end() {

     if [ $CHANGED == YES ]

     then

 	((++CHANGED_FILES))

     fi

     if [ $WARNED == YES ]

     then

 	((++WARNED_FILES))

     fi

 }

 function check_action() {

     if [ "$3" == 'tabs' ]

     then

         PATTERN=$(echo -e '\t')

     elif [ "$3" == 'trailing spaces' ]

     then

         PATTERN='\ +$'

     else

         PATTERN='*'

     fi

     if ! diff -q $1 $2 >/dev/null

     then

         if [ "$PATTERN" == '*' ]

         then

             diff $1 $2 | grep '^[0-9]' | sed "s|^\(.*\)c.*$|$2:\1: check failed: $3|g" |

               sed "s/:\([0-9]*\),\([0-9]*\):\(.*\)$/:\1:\3 (until line \2)/g"

         else

             grep -n -E "$PATTERN" $2 | sed "s|^\([0-9]*\):.*$|$2:\1: check failed: $3|g"

         fi

         FAILED=YES

     fi

 }

 function check_warning() {

     if [ "$2" == 'long lines' ]

     then

         grep -n -E '.{81,}' $1 | sed "s|^\([0-9]*\):.*$|$1:\1: warning: $2|g"

     else

         echo "$1: warning: $2"

     fi

     WARNED=YES

 }

 function check_init() {

     echo Check source files...

     FAILED_FILES=0

     WARNED_FILES=0

     TOTAL_FILES=0

 }

 function check_done() {

     echo $FAILED_FILES out of $TOTAL_FILES files has been failed.

     echo $WARNED_FILES out of $TOTAL_FILES files triggered warnings.

     if [ $FAILED_FILES -gt 0 ]

     then

 	return 1

     elif [ $WARNED_FILES -gt 0 ]

     then

 	if [ "$WARNING" == 'INTERACTIVE' ]

 	then

 	    echo -n "Are the files with warnings acceptable? (yes/no) "

 	    while read answer

 	    do

 		if [ "$answer" == 'yes' ]

 		then

 		    return 0

 		elif [ "$answer" == 'no' ]

 		then

 		    return 1

 		fi

 		echo -n "Are the files with warnings acceptable? (yes/no) "

 	    done

 	elif [ "$WARNING" == 'WERROR' ]

 	then

 	    return 1

 	fi

     fi

 }

 function check_begin() {

     ((TOTAL_FILES++))

     FAILED=NO

     WARNED=NO

 }

 function check_end() {

     if [ $FAILED == YES ]

     then

 	((++FAILED_FILES))

     fi

     if [ $WARNED == YES ]

     then

 	((++WARNED_FILES))

     fi

 }

 # checks

 function header_check() {

     if echo $1 | grep -q -E 'Makefile\.am$'

     then

 	return

     fi

     TMP_FILE=`mktemp`

     (echo "/* -*- mode: C++; indent-tabs-mode: nil; -*-

  *

  * This file is a part of LEMON, a generic C++ optimization library.

  *

  * Copyright (C) "$YEAR"

  * Egervary Jeno Kombinatorikus Optimalizalasi Kutatocsoport

  * (Egervary Research Group on Combinatorial Optimization, EGRES).

  *

  * Permission to use, modify and distribute this software is granted

  * provided that this copyright notice appears in all copies. For

  * precise terms see the accompanying LICENSE file.

  *

  * This software is provided \"AS IS\" with no warranty of any kind,

  * express or implied, and with no claim as to its suitability for any

  * purpose.

  *

  */

 "

     awk 'BEGIN { pm=0; }

      pm==3 { print }

      /\/\* / && pm==0 { pm=1;}

      /[^:blank:]/ && (pm==0 || pm==2) { pm=3; print;}

      /\*\// && pm==1 { pm=2;}

     ' $1

     ) >$TMP_FILE

     "$ACTION"_action "$TMP_FILE" "$1" header

 }

 function tabs_check() {

     if echo $1 | grep -q -v -E 'Makefile\.am$'

     then

         OLD_PATTERN=$(echo -e '\t')

         NEW_PATTERN='        '

     else

         OLD_PATTERN='        '

         NEW_PATTERN=$(echo -e '\t')

     fi

     TMP_FILE=`mktemp`

     cat $1 | sed -e "s/$OLD_PATTERN/$NEW_PATTERN/g" >$TMP_FILE

     "$ACTION"_action "$TMP_FILE" "$1" 'tabs'

 }

 function spaces_check() {

     TMP_FILE=`mktemp`

     cat $1 | sed -e 's/ \+$//g' >$TMP_FILE

     "$ACTION"_action "$TMP_FILE" "$1" 'trailing spaces'

 }

 function long_lines_check() {

     if cat $1 | grep -q -E '.{81,}'

     then

 	"$ACTION"_warning $1 'long lines'

     fi

 }

 # process the file

 function process_file() {

     if [ "$ACTION" == 'update' ]

     then

         echo -n "    $ACTION $1..."

     else

         echo "	  $ACTION $1..."

     fi

     CHECKING="header tabs spaces long_lines"

     "$ACTION"_begin $1

     for check in $CHECKING

     do

 	"$check"_check $1

     done

     "$ACTION"_end $1

     if [ "$ACTION" == 'update' ]

     then

         echo

     fi

 }

 function process_all {

     "$ACTION"_init

     while read file

     do

 	process_file $file

     done < <($FILES)

     "$ACTION"_done

 }

 while [ $# -gt 0 ]

 do

     if [ "$1" == '--help' ] || [ "$1" == '-h' ]

     then

 	echo -n \

 "Usage:

   $0 [OPTIONS] [files]

 Options:

   --dry-run|-n

      Check the files, but do not modify them.

   --interactive|-i

      If --dry-run is specified and the checker emits warnings,

      then the user is asked if the warnings should be considered

      errors.

   --werror|-w

      Make all warnings into errors.

   --all|-a

      Check all source files in the repository.

   --modified|-m

      Check only the modified (and new) source files. This option is

      useful to check the modification before making a commit.

   --changed|-c

      Check only the changed source files compared to the parent(s) of

      the current hg node.  This option is useful as hg hook script.

      To automatically check all your changes before making a commit,

      add the following section to the appropriate .hg/hgrc file.

        [hooks]

        pretxncommit.checksources = scripts/unify-sources.sh -c -n -i

   --help|-h

      Print this help message.

   files

      The files to check/unify. If no file names are given, the modified

      source files will be checked/unified (just like using the

      --modified|-m option).

 "

         exit 0

     elif [ "$1" == '--dry-run' ] || [ "$1" == '-n' ]

     then

 	[ -n "$ACTION" ] && echo "Conflicting action options" >&2 && exit 1

 	ACTION=check

     elif [ "$1" == "--all" ] || [ "$1" == '-a' ]

     then

 	[ -n "$FILES" ] && echo "Conflicting target options" >&2 && exit 1

 	FILES=all_files

     elif [ "$1" == "--changed" ] || [ "$1" == '-c' ]

     then

 	[ -n "$FILES" ] && echo "Conflicting target options" >&2 && exit 1

 	FILES=changed_files

     elif [ "$1" == "--modified" ] || [ "$1" == '-m' ]

     then

 	[ -n "$FILES" ] && echo "Conflicting target options" >&2 && exit 1

 	FILES=modified_files

     elif [ "$1" == "--interactive" ] || [ "$1" == "-i" ]

     then

 	[ -n "$WARNING" ] && echo "Conflicting warning options" >&2 && exit 1

 	WARNING='INTERACTIVE'

     elif [ "$1" == "--werror" ] || [ "$1" == "-w" ]

     then

 	[ -n "$WARNING" ] && echo "Conflicting warning options" >&2 && exit 1

 	WARNING='WERROR'

     elif [ $(echo x$1 | cut -c 2) == '-' ]

     then

 	echo "Invalid option $1" >&2 && exit 1

     else

 	[ -n "$FILES" ] && echo "Invalid option $1" >&2 && exit 1

 	GIVEN_FILES=$@

 	FILES=given_files

 	break

     fi

     shift

 done

 if [ -z $FILES ]

 then

     FILES=modified_files

 fi

 if [ -z $ACTION ]

 then

     ACTION=update

 fi

 process_all