Add deploy script for gh-pages publishing

Author: perki

package.json

@@ -10,6 +10,7 @@
     "test:coverage": "NODE_ENV=test c8 mocha tests --test-reporter=spec",
     "test:coverage:ci": "NODE_ENV=test c8 mocha tests --test-reporter=spec --timeout=20000",
     "build": "npm run build:ts; npm run build:webpack",
+    "deploy": "bash scripts/deploy.sh",
     "build:ts": "tsc",
     "build:webpack": "webpack",
     "lint": "eslint .",

scripts/deploy.sh

@@ -0,0 +1,51 @@
+#!/usr/bin/env bash
+# Deploy to gh-pages.
+set -euo pipefail
+
+scriptsFolder=$(cd $(dirname "$0"); pwd)
+cd "$scriptsFolder/.."
+
+MAIN_BRANCH="main"
+BRANCH="$(git rev-parse --abbrev-ref HEAD)"
+if [ "$BRANCH" != "$MAIN_BRANCH" ]; then
+  echo "ERROR: Deploy only allowed from '$MAIN_BRANCH' (current: $BRANCH)."
+  exit 1
+fi
+
+if [ -n "$(git status --porcelain)" ]; then
+  echo "ERROR: Working tree is not clean."
+  git status --short
+  exit 1
+fi
+
+if [ ! -d dist/.git ]; then
+  echo "ERROR: dist/ is not a gh-pages checkout. Run 'npm run setup' first."
+  exit 1
+fi
+
+COMMIT_SHORT="$(git rev-parse --short HEAD)"
+COMMIT_FULL="$(git rev-parse HEAD)"
+echo "Deploying commit $COMMIT_SHORT ..."
+
+echo "Building..."
+npm run build
+echo "Build OK."
+
+# Generate version.json
+cat > dist/version.json << VEOF
+{
+  "commit": "$COMMIT_FULL",
+  "commitShort": "$COMMIT_SHORT",
+  "branch": "$MAIN_BRANCH",
+  "buildDate": "$(date -u +%Y-%m-%dT%H:%M:%SZ)"
+}
+VEOF
+git -C dist add -A
+if git -C dist diff --cached --quiet; then
+  echo "No changes in dist/ — nothing to deploy."
+  exit 0
+fi
+git -C dist commit -m "deploy $COMMIT_SHORT ($COMMIT_FULL)"
+git -C dist push
+
+echo "Deployed $COMMIT_SHORT to gh-pages."