#!/usr/bin/env sh
#
# Hook used to indent files before commiting
#


#
# Pre-conditions
#
if test -d ".git/rebase-merge"          || \
   test -d ".git/rebase-apply"          || \
   test -f ".git/MERGE_HEAD"            || \
   test -f ".git/CHERRY_PICK_HEAD"      || \
   test -f ".git/BISECT_LOG"
then
    exit 0
fi

#
# Configuration check
#
if test ! -x "$XMLINDENT"
then
    XMLINDENT="$(git config --get hooks.xmlindent)"
fi
if test ! -x "$XMLINDENT"
then
    echo "Unable to find xmlindent executable on the configuration."
    echo
    echo "Please configure it with :"
    echo "  git config --global hooks.xmlindent C:/path/to/xmlindent"
    echo " or "
    echo "  git config --global hooks.xmlindent /usr/bin/xmlindent"
    echo
fi

if test -z "$(git config --get-all xmlindent.ignored)"
then
    echo "Unable to find xmlindent ignored list on the configuration, ignored"
    echo
    echo "You can configure it with :"
    echo "  git config --add xmlindent.ignored 'scilab/Visual-Studio-settings/*.xml' "
    echo "  git config --add xmlindent.ignored 'scilab/checkstyle/*.xml' "
    echo

    XMLINDENT_IGNORED=""
else
    XMLINDENT_IGNORED="$(find $(git config --get-all xmlindent.ignored))"
fi

if test ! -x "$ASTYLE"
then
    ASTYLE="$(git config --get hooks.astyle)"
fi
if test ! -x "$ASTYLE"
then
    echo "Unable to find astyle executable on the configuration."
    echo
    echo "Please configure it with :"
    echo "  git config --global hooks.astyle C:/path/to/astyle"
    echo " or "
    echo "  git config --global hooks.astyle /usr/bin/astyle"
    echo
fi

if test -z "$(git config --get-all astyle.ignored)"
then
    echo "Unable to find astyle ignored list on the configuration, ignored"
    echo
    echo "You can configure it with :"
    echo "  git config --add astyle.ignored 'scilab/modules/*/src/jni/*.hxx' "
    echo "  git config --add astyle.ignored 'scilab/modules/*/src/jni/*.cpp' "
    echo "  git config --add astyle.ignored 'scilab/modules/*/src/jni/*.c' "
    echo "  git config --add astyle.ignored 'scilab/modules/javasci/src/java/org/scilab/modules/javasci/Call_Scilab*.java' "
    echo "  git config --add astyle.ignored 'scilab/modules/renderer/src/java/org/scilab/modules/renderer/FigureScilabCall*.java' "
    echo "  git config --add astyle.ignored 'scilab/modules/helptools/src/java/org/scilab/modules/helptools/SynopsisLexer.java' "
    echo "  git config --add astyle.ignored 'scilab/modules/helptools/src/java/org/scilab/modules/helptools/XML/XMLLexer.java' "
    echo "  git config --add astyle.ignored 'scilab/modules/helptools/src/java/org/scilab/modules/helptools/c/CLexer.java' "
    echo "  git config --add astyle.ignored 'scilab/modules/helptools/src/java/org/scilab/modules/helptools/java/JavaLexer.java' "
    echo "  git config --add astyle.ignored 'scilab/modules/helptools/src/java/org/scilab/modules/helptools/scilab/ScilabLexer.java' "
    echo "  git config --add astyle.ignored 'scilab/modules/scinotes/src/java/org/scilab/modules/scinotes/FunctionScanner.java' "
    echo "  git config --add astyle.ignored 'scilab/modules/scinotes/src/java/org/scilab/modules/scinotes/IndentScanner.java' "
    echo "  git config --add astyle.ignored 'scilab/modules/scinotes/src/java/org/scilab/modules/scinotes/MatchingBlockScanner.java' "
    echo "  git config --add astyle.ignored 'scilab/modules/scinotes/src/java/org/scilab/modules/scinotes/ScilabLexer.java' "
    echo "  git config --add astyle.ignored 'scilab/modules/xcos/src/java/org/scilab/modules/xcos/Controller.java' "
    echo "  git config --add astyle.ignored 'scilab/modules/xcos/src/java/org/scilab/modules/xcos/JavaController.java' "
    echo "  git config --add astyle.ignored 'scilab/modules/xcos/src/java/org/scilab/modules/xcos/Kind.java' "
    echo "  git config --add astyle.ignored 'scilab/modules/xcos/src/java/org/scilab/modules/xcos/ObjectProperties.java' "
    echo "  git config --add astyle.ignored 'scilab/modules/scicos/src/scicos_sundials/*' "

    echo

    ASTYLE_IGNORED=""
else
    ASTYLE_IGNORED="$(find $(git config --get-all astyle.ignored))"
fi

# indent / format file by type
#
indent() {
    # getting against as the current commit
    if git rev-parse --verify HEAD >/dev/null 2>&1
    then
        local against=HEAD
    else
        # Initial commit: diff against an empty tree object
        local against=4b825dc642cb6eb9a060e54bf8d69288fbee4904
    fi

    # get the modified files per kind filtering out ignored files and call the
    # __indent_XXX helper

    FILES=$(git diff --cached --name-only --diff-filter=ACM $against |grep -E "\.(xcos|xml|xsl)$" |grep -v -F "$XMLINDENT_IGNORED")
    [ -z "$FILES" ] || __indent_xml;

    FILES=$(git diff --cached --name-only --diff-filter=ACM $against |grep -E "\.(h|c|hxx|cpp)$" |grep -v -F "$ASTYLE_IGNORED")
    [ -z "$FILES" ] || __indent_C;

    FILES=$(git diff --cached --name-only --diff-filter=ACM $against |grep -E "\.java$" |grep -v -F "$ASTYLE_IGNORED")
    [ -z "$FILES" ] || __indent_java;

    FILES=$(git diff --cached --name-only --diff-filter=ACM $against |grep -E "\.(sce|sci|tst)$")
    [ -z "$FILES" ] || __indent_scilab;

    return 0;
}

# Indent the file with xmlindent if this is an xcos file
__indent_xml() {
    if test ! -x "$XMLINDENT"
    then
        return 1;
    fi

    echo "Formatting" "$FILES"
    "$XMLINDENT" -w -i 4 $FILES || return 2;
    # xmlindent does not remove trailing whitespaces
    # and might add some on empty lines
    sed -i -e 's/[ \t]*$//' $FILES || return 2;
    git add $FILES || return 3;
}

# Pre process before the indent
__pre_indent() {
    if test ! -x "$ASTYLE"
    then
        return 1;
    fi

    echo "Indenting" $FILES
    return 0;
}

# post process after the indent
__post_indent() {
    git add $FILES
}

COMMON_ASTYLE_ARGS="--pad-header --suffix=none --pad-oper --indent-col1-comments --indent-switches --indent=spaces=4 --add-brackets --formatted"

# Indent the file with `astyle' if this is a C/CPP file
__indent_C() {
    __pre_indent || return 1
    $ASTYLE $COMMON_ASTYLE_ARGS --style=bsd $FILES || return 2
    __post_indent || return 3
    return 0
}

# Indent the file with `astyle' if this is a Java file
__indent_java() {
    __pre_indent || return 1
    $ASTYLE $COMMON_ASTYLE_ARGS --style=java $FILES || return 2
    __post_indent || return 3
    return 0
}

# Indent the file with `scinotes' if this is a Scilab file
__indent_scilab() {
    __pre_indent || return 1

    TMPFILE="scinotes_indent.sce"
    echo "files = [" >$TMPFILE
    printf "'%s'\n" $FILES >>$TMPFILE
    echo "];" >>$TMPFILE

    echo "scinotes(files, ['indent','trailing','quote'])" >>$TMPFILE
    echo "exit(0)" >>$TMPFILE

    if test -f scilab/scilab-bin; then
        scilab/bin/scilab -nw -f $TMPFILE || return 2
    else
        if test -f scilab/bin/WScilex.exe; then
            scilab/bin/scilex.exe -f $TMPFILE || return 2
        else
            echo "Scilab has not been built."
            rm $TMPFILE
            return 4
        fi
    fi
    rm $TMPFILE

    __post_indent || return 3
    return 0
}

indent