#!/bin/sh


_usage() {
    echo "Usage: $0 [-n] PO_FILE"
    echo "Ease the correction of fuzzies inserted by merge commits"
    echo
    echo "-n, --no-edit    do not launch po editor"
    exit
}

LAUNCH_EDIT=1
if [ $# -eq 2 ]; then
    if [ "$1" -eq "-n" ] || [ "$1" -eq "--no-edit" ]; then
        LAUNCH_EDIT=0
    else
        _usage
    fi
    shift
fi

if [ $# -ne 1 ]; then
    _usage
fi

if [ ! -f "$1" ]; then
    echo "$1: file not found"
    _usage
fi

# Temp directory to filter files before display
TMP_DIR=$(mktemp -d /tmp/fuzzy_diff.XXXXXX || exit 1)
trap 'rm --force --recursive "${TMP_DIR}"' EXIT


PO_EDITOR=poedit
DIFFTOOL=$(which $(git config diff.tool))

if [ ! -x "$DIFFTOOL" ]; then
    echo "git diff.tool seems not configured"
    _usage
fi

PO_FILE=$1

# search for revs where fuzzy was added or suppressed
# and filter where commit message contains 'merge'
FUZZY_REVS=$(git log --oneline -S '#, fuzzy' ${PO_FILE} | \
             grep -i 'merge' | \
             awk '{ print $1 }')

if [ ${LAUNCH_EDIT} -eq 1 ]; then
    ${PO_EDITOR} "${PO_FILE}" 2>/dev/null &
fi

for sha in ${FUZZY_REVS} ; do
    # filter files à la mode textconv
    git show ${sha}:${PO_FILE} | grep -v -e '^#:' -e '^"PO' > ${TMP_DIR}/right.po
    git show ${sha}^:${PO_FILE} | grep -v -e '^#:' -e '^"PO' > ${TMP_DIR}/left.po
    "${DIFFTOOL}" ${TMP_DIR}/left.po ${TMP_DIR}/right.po
done

# clean up temp directory
rm --force --recursive "${TMP_DIR}"
trap - EXIT