new_release.sh

#! /bin/bash

# Script to create a new release.
#
# Creates a commit containing only the CHANGELOG and cabal file changes.
#
# Checks the state of the repository to make sure things are up to date
# beforehand, and also checks the current build status on travis.
#
# Nothing project-specific. Should work for any project on github which
# is set up to use travis.

#set -x
set -e
cd `dirname $0`

NEW_VERSION="$1"
BRANCH="$2"
[ -z "$BRANCH" ] && BRANCH="master"
SLUG=`git config -l | grep remote.origin.url | sed s/.*:// | sed s/\.git//`
PROJECT=`echo $SLUG | sed 's/.*\///'`

function opt_exit {
    read -t 30 -p "Do you want to continue (y/n) ? " yn
    case ${yn:0:1} in
        y|Y )
            echo "Continuing..."
        ;;
        * )
            exit 1
        ;;
    esac
}

git status -b -s | grep -q "## $BRANCH" \
    || ( echo "Not on $BRANCH branch."; exit 1 )

[ -f "$PROJECT.cabal" ] \
    || ( echo "Cabal file not found for $PROJECT."; exit 1 )

[ -z "$NEW_VERSION" ] \
    && ( echo "Please provide new version for the release."; exit 1 )

echo "Project is $PROJECT. Release is $NEW_VERSION"

# The only uncommitted change at this stage should be the CHANGELOG
git status -s --untracked-files=no | grep -v 'CHANGELOG' \
    && ( echo "There are uncommitted changes. Make sure changes are committed or stashed and pushed, and the CI build is OK."; exit 1 )

git status -s | grep '??' \
    && ( echo "There are untracked files in the repository."; opt_exit )

# Make sure we have latest changes and check we are up to date with origin
git fetch origin

[ `git rev-list HEAD...origin/$BRANCH --count` = "0" ] \
    || ( echo "$BRANCH is different from origin/$BRANCH"; opt_exit )

git tag | grep -q "$NEW_VERSION" \
    && ( echo "A git tag matching $NEW_VERSION already exists."; exit 1 )

grep -q "$NEW_VERSION" CHANGELOG.md \
    || ( echo "Please add a changelog entry for this release."; exit 1 )

echo "Checking CI build state..."
CI_RUN=$(curl -H "Accept: application/vnd.github.v3+json" "https://api.github.com/repos/$SLUG/actions/runs" \
    | jq '.workflow_runs | map(select(.head_branch == "master" and .name == "Haskell CI"))[0]')

CI_STATUS=$(jq -n "${CI_RUN}|.status")

[[ $CI_STATUS = "\"completed\"" ]] \
    || ( echo "Last CI Run status is $CI_STATUS (not \"completed\"). Please check it or wait for it to finish."; exit 1)

CI_CONCLUSION=$(jq -n "${CI_RUN}|.conclusion")

[[ $CI_CONCLUSION = "\"success\"" ]] \
    || ( echo "Last CI Run conclusion is $CI_CONCLUSION (expected \"success\")"; exit 1)

perl -i -p -e 's/^([vV]ersion:\s+)\d.*/${1}'"${NEW_VERSION}"'/' "$PROJECT.cabal"

git add "$PROJECT.cabal"
git add CHANGELOG.md

git commit -m "Release $NEW_VERSION"
git tag -m "Release $NEW_VERSION" -s "$NEW_VERSION" \
    || ( echo "Failed to tag release."; exit 1 )

echo "No remote changes yet. Next step will push the changes."
opt_exit

git push
git push --tags