update-codex.sh
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update-codex.sh
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	#!/bin/bash -eu

	# This script generates a commit that updates our copy of Codex Design Tokens

	if [ -n "${2:-}" ]
	then
	# Too many parameters
	echo >&2 "Usage: $0 [<version>]"
	exit 1
	fi

	REPO_DIR=$(cd "$(dirname $0)/.."; pwd) # Root dir of the git repo working tree
	TARGET_DIR="lib/codex-design-tokens/" # Destination relative to the root of the repo
	NPM_DIR=$(mktemp -d 2>/dev/null \|\| mktemp -d -t 'update-codex-design-tokens') # e.g. /tmp/update-oojs.rI0I5Vir

	# Prepare working tree
	cd "$REPO_DIR"
	git reset -- $TARGET_DIR
	git checkout -- $TARGET_DIR
	git fetch origin
	git checkout -B upstream-codex-design-tokens origin/master

	# Fetch upstream version
	cd $NPM_DIR
	if [ -n "${1:-}" ]
	then
	npm install "@wikimedia/codex-design-tokens@$1"
	else
	npm install @wikimedia/codex-design-tokens
	fi

	CODEX_VERSION=$(node -e 'console.log(require("./node_modules/@wikimedia/codex-design-tokens/package.json").version);')
	if [ "$CODEX_VERSION" == "" ]
	then
	echo 'Could not find CODEX version'
	exit 1
	fi

	# Copy file(s)
	rsync --force ./node_modules/@wikimedia/codex-design-tokens/dist/theme-wikimedia-ui.less "$REPO_DIR/$TARGET_DIR"

	# Clean up temporary area
	rm -rf "$NPM_DIR"

	# Generate commit
	cd $REPO_DIR

	COMMITMSG=$(cat <<END
	Update Codex Design Tokens to v$CODEX_VERSION

	Release notes:
	https://gerrit.wikimedia.org/r/plugins/gitiles/design/codex/+/refs/tags/$CODEX_VERSION/CHANGELOG.md
	END
	)

	# Stage deletion, modification and creation of files. Then commit.
	git add --update $TARGET_DIR
	git add $TARGET_DIR
	git commit -m "$COMMITMSG"