#!@BASH_PATH@
#
# Copyright 2016-2023 the Pacemaker project contributors
#
# The version control history for this file may have further details.
#
# This source code is licensed under the GNU General Public License version 2
# or later (GPLv2+) WITHOUT ANY WARRANTY.
#

# diff fails with ec=2 if no predecessor is found;
# this uses '=' GNU extension to sed, if that's not available,
# one can use: hline=`echo "$${p}" | grep -Fn "$${hunk}" | cut -d: -f1`;
# XXX: use line information from hunk to avoid "not detected" for ambiguity
for p in $*; do
    set $(echo "$p" | tr '-' ' ')
    echo "### *-$2.rng vs. predecessor"

    for v in *-"$2".rng; do
        echo "#### $v vs. predecessor"

        b=$(echo "$v" | cut -d- -f1)
        old=$(./best-match.sh "$b" "$1")
        p=$(diff -u "$old" "$v" 2>/dev/null)

        case $? in
            1)
                echo "$p" | sed -n -e '/^@@ /!d;=;p' -e ':l;n;/^\([- ]\|+.*<[^ />]\+\([^/>]\+="ID\|>$$\)\)/bl;s/^[+ ]\(.*\)/\1/p' |
                while read -r hline; do
                    if read -r h; then
                        read -r i
                    else
                        break
                    fi

                    iline=$(grep -Fn "$i" "$v" | cut -d: -f1)

                    if [ "$(echo "$iline" | wc -l)" = "1" ]; then
                        ctxt=$({ sed -n -e "1,$((iline - 1))p" "$v"
                                 echo "<inject id=\"GOAL\"/>$i"
                                 sed -n -e "$((iline + 1)),$ p" "$v"
                               } | xsltproc --param skip 1 context-of.xsl -)
                    else
                        ctxt="(not detected)"
                    fi

                    echo "$p" | sed -n -e "$((hline - 2)),$hline!d" -e '/^\(+++\|---\)/p'
                    echo "$h context: $ctxt"
                    echo "$p" | sed -n -e "1,${hline}d" -e '/^\(---\|@@ \)/be;p;d;:e;n;be'
                done

                ;;

            2)
                echo "##### $v has no predecessor"
                ;;

        esac
    done
done