#!/bin/bash

YEAR=`date +%Y`

HGROOT=`hg root`

function hg_year() {

    if [ -n "$(hg st $1)" ]; then

        echo $YEAR

}

# 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

        if echo $2 | grep -q -v -E 'Makefile\.am$'

        then

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

        else

            PATTERN='        '

        fi

    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 [ $WARNED_FILES -gt 0 -o $FAILED_FILES -gt 0 ]

    then

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

	then

	    echo -n "Are the files with errors/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 errors/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) 2003-"$(hg_year $1)"

 * 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