#!/bin/bash -

# FILE="/tmp/post-merge$(date +%FT%H-%M-%S)"
# commit=$(git rev-parse --verify HEAD)
# echo "$commit $(git cat-file commit $commit)" >> /tmp/post-merge

# Redirect output to stderr.
exec 1>&2

if [ -z $IFS ]; then
    IFS=$'\n'
fi

GIT_PULL_TMP=/tmp/git_pull
OPKG_CMDS_TMP=/tmp/opkg_commands

rm -f $GIT_PULL_TMP
rm -f $OPKG_CMDS_TMP

get_blob () {   # get the blob of the file(name) passed as $1
                # note: this can be used for any file in the filesystem
    echo $(git hash-object $1)
}

get_commit_for_blob () {
    # search for the blob in all commits for the file(name) $1
    echo $(git log --all --pretty=format:%H -- $1 | xargs -I{} bash -c "git ls-tree {} -- $1 | grep -q $1 && echo {}")
}

changed_file_names () {
    for fn in $(git diff-tree -r HEAD@{1} HEAD --name-only); do
        # called in repository: $fn is e.g. etc/psa_tariff/tariff01.json
        # add '/' prefix
        fn=$(echo $fn | awk '{ printf "/"$0 }')
        CHANGED_FILE_NAMES+=($fn)
    done
}

for fn in $(git diff-tree -r HEAD@{1} HEAD --name-only); do
    if grep -E -q "(DC.*json|dc.*hex|dc.*bin|tariff.*json)" <<< $fn; then
        # called in repository: $fn is e.g. etc/psa_tariff/tariff01.json
        # add '/' prefix
        fn=$(echo $fn | awk '{ printf "/"$0 }')
        if [[ -f "$fn" ]]; then
            blob=$(get_blob "$fn")
            commit=$(get_commit_for_blob $blob)
            fsize=$(ls -l "$fn" | awk '{ print $5 }')
            echo "$fn $fsize b=$blob c=$commit" >> $GIT_PULL_TMP
        fi
    fi
    if grep -E -q ".*opkg_commands" <<< $fn; then
        readarray opkg_commands < <(cat $fn)
        for opkg_c in "${opkg_commands[@]}"; do
            test -z $opkg_c && continue;
            test ! -z $(grep -E "^\s*[#]+.*$" <<< $opkg_c) && continue
            echo -n "$opkg_c" | tr -d '\n\r' >> $OPKG_CMDS_TMP 2>&1
            echo "" >> $OPKG_CMDS_TMP 2>&1
        done
        source "$fn"
    fi
done