#!/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" = "-n" ] || [ "$1" = "--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

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

while read line ; do
    gdh=$(date --date=@${line:0:10})
    sha=${line:11:40}
    author=${line:52}
    echo "Comparing with: ${gdh} - ${author}"
    # filter files à la mode textconv
    git show ${sha}^:${PO_FILE} | \
        grep --invert-match \
             --regexp='^#:' \
             --regexp='^"PO' > "${TMP_DIR}/${gdh}.po"
    # reload current file every time as it may has been modified
    grep --invert-match \
         --regexp='^#:' \
         --regexp='^"PO' ${PO_FILE} > ${TMP_DIR}/current.po
    "${DIFFTOOL}" "${TMP_DIR}/${gdh}.po" ${TMP_DIR}/current.po
done <<< $(git blame --line-porcelain ${PO_FILE} | \
           awk '/^[0-9a-f]{40} / { sha=$1 } 
                /^author / {$1="" ; author=$0 } 
                /^committer-time / { $1="" ; date=$0 } 
                /^\s#, fuzzy/ { printf "%-10s %-40s %s\n", date, sha, author}' |
           sort --numeric-sort --unique --reverse)

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