#!/bin/sh -eu

# Joins line that starts with space to previous:
# https://www.gnu.org/software/sed/manual/html_node/Joining-lines.html
MERG_LN=':a ; $!N ; s/\n\s+/ / ; ta ; P ; D'
# https://unix.stackexchange.com/questions/114943/can-sed-replace-new-line-characters
REPL_NL=':a;N;$!ba;s/\n/\\n/g'

sudo apt install jq
URL=$(curl -S -H "Authorization: token $GITHUB_TOKEN" -X GET https://api.github.com/repos/$GITHUB_REPOSITORY/releases/tags/$TAG | jq -r '.url')
REQ=PATCH
if [ $URL = null ]; then # release doesn't yet exist
  REQ=POST
  URL=https://api.github.com/repos/$GITHUB_REPOSITORY/releases
fi
DATE=$(date -Iminutes)
if [ $VERSION = continuous ]; then
        TITLE='continuous builds'
        SUMMARY='Current builds from Git master branch. macOS alternative build is rebuilt daily, Linux ARM builds occasionally. Archived builds can be found [here](https://frakira.fi.muni.cz/~xpulec/ug-nightly-archive/).'
        PRERELEASE=true
else
        TITLE="UltraGrid $VERSION"
        FIXES=
        if [ -f FIXES.md ]; then
                TMP=$(mktemp)
                sed -E "$MERG_LN" < FIXES.md | sed -e "$REPL_NL" > "$TMP"
                F=$(cat "$TMP")
                FIXES="### Fixes since last release:\n$F\n"
                rm "$TMP"
        fi
        TMP=$(mktemp)
        sed -e '1,2d' -e '/^$/q' < NEWS | sed -E "$MERG_LN" | sed -e "$REPL_NL" > "$TMP"
        N=$(cat "$TMP")
        SUMMARY="### Changes:\n$N\n$FIXES\n**Full changelog:** https://github.com/$GITHUB_REPOSITORY/commits/$TAG"
        rm "$TMP"
        PRERELEASE=false
fi

curl -S -H "Authorization: token $GITHUB_TOKEN" -X $REQ $URL -T - <<EOF
{
  "tag_name": "$TAG", "name": "$TITLE",
  "body": "Built $DATE\n\n$SUMMARY",
  "draft": false, "prerelease": $PRERELEASE
}
EOF