#!/bin/sh
# vim: set ts=4:
#
# Deploys doc/ to the gh-pages branch in the repository.
#
# Environment variables:
#   GH_TOKEN : GitHub Personal Token to use for authentication when pushing
#              back into the repository.
set -eu

DEPLOY_BRANCH='gh-pages'
SOURCE_BRANCH='master'


copy_docs() {
	local build_dir="$1"

	test -d doc || die "Directory $(pwd)/doc does not exist"

	rm -Rf -- "$build_dir"/ldoc/*
	mkdir -p "$build_dir"/ldoc/*
	cp -r doc/ldoc/* "$build_dir"/ldoc/

	# Remove Last updated timestamp.
	LANG=C find "$build_dir"/ldoc -name '*.html' \
		-exec sed -i.BAK 's/<i style="float:right;">Last updated.*//' {} \; \
		-exec rm {}.BAK \;  # sed -i behaves differently on BSD and GNU...
}

has_changes() {
	test -n "$(git status --porcelain)"
}

remote_origin_url() {
	if [ -n "${GH_TOKEN:-}" ]; then
		git config remote.origin.url \
			| sed 's|^git:|https:|' \
			| sed "s|^https://|https://${GH_TOKEN}@|"
	else
		git config remote.origin.url
	fi
}

shield() {
	if [ -n "${GH_TOKEN:-}" ]; then
		eval $@ 2>&1 | sed "s/$GH_TOKEN/*****/g"
	else
		eval $@
	fi
}


#========================  Main  =========================#

cd "$(dirname "$0")/.."
. script/utils.sh

einfo 'Updating ldoc documentation'

commit_rev="$(git rev-parse --short HEAD)"
commit_author="$(git log -n 1 --format='%aN <%aE>')"
commit_date="$(git log -n 1 --format='%aD')"
remote_url="$(remote_origin_url)" || die 'Failed to get remote.origin.url'
build_dir="$(mktemp -q -d "${TMPDIR:-"/tmp"}/docs.XXXX")"

if [ -n "${TRAVIS:-}" ]; then
	git config --global user.name 'Travis CI'
	git config --global user.email 'travis-ci@local.host'
fi

shield git clone --progress "$remote_url" "$build_dir"
git -C "$build_dir" checkout "$DEPLOY_BRANCH" \
	|| die "Branch $DEPLOY_BRANCH does not exist"

copy_docs "$build_dir"

cd "$build_dir"

if ! has_changes; then
	ewarn 'No changes'; exit 0
fi

einfo 'Commiting changes'
git add --all
git commit \
	--message="Built from $commit_rev" \
	--author="$commit_author" \
	--date="$commit_date"

einfo "Pushing changes to $DEPLOY_BRANCH branch"
shield git push --progress "$remote_url" "$DEPLOY_BRANCH:$DEPLOY_BRANCH"

rm -Rf -- "$build_dir"