#!/bin/sh

if [[ $# -ne 1 ]]; then
 echo "usage: $0 PO_FILE"
 echo "Ease the correction of fuzzies inserted by merge commits"
 exit
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=$(which poedit)
DIFFTOOL=$(which meld)
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 }')

{PO_EDITOR} ${PO_FILE} 2>/dev/null &
for sha in ${FUZZY_REVS} ; do
    # show the diff between parent rev and fuzzy rev

    # simple version which includes all modifications
    #git difftool --no-prompt ${sha}^ ${sha} -- ${PO_FILE}

    # 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