support cli option open

packages/@vuepress/core/lib/dev.js

@@ -7,6 +7,7 @@ module.exports = async (sourceDir, cliOptions = {}, ctx) => {
       console.log(err)
     }
   })
+  return { host, port }
 }
 
 module.exports.prepare = prepareServer

packages/vuepress/lib/registerCoreCommands.js

@@ -7,6 +7,8 @@
 const { dev, build, eject } = require('@vuepress/core')
 const { path, logger, env } = require('@vuepress/shared-utils')
 const { wrapCommand } = require('./util')
+const opn = require('opn')
+const url = require('url')
 
 /**
  * Expose registerCoreCommands function.
@@ -24,7 +26,7 @@ module.exports = function (cli, options) {
     .option('--silent', 'start development server in silent mode')
     .option('--open', 'open browser when ready')
     .action((sourceDir = '.', commandOptions) => {
-      const { debug, silent } = commandOptions
+      const { debug, silent, open } = commandOptions
 
       logger.setOptions({ logLevel: silent ? 1 : debug ? 4 : 3 })
       logger.debug('global_options', options)
@@ -34,6 +36,13 @@ module.exports = function (cli, options) {
       wrapCommand(dev)(path.resolve(sourceDir), {
         ...options,
         ...commandOptions
+      }).then((urlObject) => {
+        if (!open) return
+        opn(url.format({
+          protocol: 'http',
+          hostname: urlObject.host,
+          port: urlObject.port
+        }))
       })
     })
 

packages/vuepress/package.json

@@ -31,7 +31,8 @@
   "dependencies": {
     "@vuepress/core": "^1.0.0-alpha.39",
     "@vuepress/theme-default": "^1.0.0-alpha.39",
-    "cac": "^6.3.9"
+    "cac": "^6.3.9",
+    "opn": "^5.4.0"
   },
   "engines": {
     "node": ">=8"

yarn.lock

@@ -7369,6 +7369,13 @@ opn@^5.1.0:
   dependencies:
     is-wsl "^1.1.0"
 
+opn@^5.4.0:
+  version "5.4.0"
+  resolved "https://registry.yarnpkg.com/opn/-/opn-5.4.0.tgz#cb545e7aab78562beb11aa3bfabc7042e1761035"
+  integrity sha512-YF9MNdVy/0qvJvDtunAOzFw9iasOQHpVthTCvGzxt61Il64AYSGdK+rYwld7NAfk9qJ7dt+hymBNSc9LNYS+Sw==
+  dependencies:
+    is-wsl "^1.1.0"
+
 optimist@^0.6.1:
   version "0.6.1"
   resolved "https://registry.yarnpkg.com/optimist/-/optimist-0.6.1.tgz#da3ea74686fa21a19a111c326e90eb15a0196686"