release script

scripts/.npmrc

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+email=${NPM_EMAIL}
+//registry.npmjs.org/:_authToken=${NPM_TOKEN}

scripts/release.js

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+const cp = require('child_process');
+const p = require('path');
+const semver = require('semver');
+
+function execSync(cmd) {
+  cp.execSync(cmd, {stdio: ['inherit', 'inherit', 'inherit']});
+}
+
+function execSyncRead(cmd) {
+  return String(cp.execSync(cmd, {stdio: ['inherit', 'pipe', 'inherit']})).trim();
+}
+
+function execSyncSilently(cmd) {
+  cp.execSync(cmd, {stdio: ['ignore', 'ignore', 'ignore']});
+}
+
+function validateEnv() {
+  if (!process.env.CI || !process.env.TRAVIS) {
+    throw new Error(`releasing is only available from Travis CI`);
+  }
+
+  if (process.env.TRAVIS_BRANCH !== 'master') {
+    console.error(`not publishing on branch ${process.env.TRAVIS_BRANCH}`);
+    return false;
+  }
+
+  if (process.env.TRAVIS_PULL_REQUEST !== 'false') {
+    console.error(`not publishing as triggered by pull request ${process.env.TRAVIS_PULL_REQUEST}`);
+    return false;
+  }
+
+  return true;
+}
+
+function setupGit() {
+  execSyncSilently(`git config --global push.default simple`);
+  execSyncSilently(`git config --global user.email "${process.env.GIT_EMAIL}"`);
+  execSyncSilently(`git config --global user.name "${process.env.GIT_USER}"`);
+  const remoteUrl = new RegExp(`https?://(\\S+)`).exec(execSyncRead(`git remote -v`))[1];
+  execSyncSilently(`git remote add deploy "https://${process.env.GIT_USER}:${process.env.GIT_TOKEN}@${remoteUrl}"`);
+  execSync(`git checkout master`);
+}
+
+function calcNewVersion() {
+  const latestVersion = execSyncRead(`npm view ${process.env.npm_package_name}@next version`);
+  console.log(`latest version is: ${latestVersion}`);
+  const packageJsonVersion = process.env.npm_package_version;
+  console.log(`package.json version is: ${packageJsonVersion}`);
+  const diff = semver.diff(packageJsonVersion, latestVersion);
+  if (diff === 'major' || diff === 'minor') {
+    return packageJsonVersion;
+  } else {
+    return semver.inc(latestVersion, 'patch');
+  }
+}
+
+function copyNpmRc() {
+  const npmrcPath = p.resolve(`${__dirname}/.npmrc`);
+  execSync(`cp -rf ${npmrcPath} .`);
+}
+
+function tagAndPublish(newVersion) {
+  console.log(`new version is: ${newVersion}`);
+  execSync(`npm version ${newVersion} -m "v${newVersion} [ci skip]"`);
+  execSyncSilently(`git push deploy --tags`);
+  execSync(`npm publish`);
+}
+
+function run() {
+  if (!validateEnv()) {
+    return;
+  }
+  setupGit();
+  copyNpmRc();
+  tagAndPublish(calcNewVersion());
+}
+
+run();
+