feat(cmd): add ping command

Ref: https://npm.community/t/tink-implement-ancillary-subcommands/3086/9

bin/tink.js

@@ -7,6 +7,7 @@ if (require.main === module) {
 }
 module.exports = main
 function main () {
+  require('npmlog').heading = 'tink'
   return require('yargs')
     .commandDir('../lib/yargs-modules')
     .demandCommand()

lib/commands/ping.js

@@ -0,0 +1,37 @@
+'use strict'
+
+const npmConfig = require('../config.js')
+const libnpm = require('libnpm')
+const figgyPudding = require('figgy-pudding')
+const log = require('npmlog')
+
+module.exports = ping
+
+const PingConfig = figgyPudding({
+  json: {},
+  registry: {},
+  silent: {}
+})
+
+function ping (argv) {
+  const opts = PingConfig(npmConfig().concat(argv))
+
+  log.notice('PING', opts.registry)
+  const start = Date.now()
+  return libnpm.fetch.json('/-/ping?write=true', opts).catch(() => ({})).then(details => {
+    if (opts.silent) {
+    } else {
+      const time = Date.now() - start
+      log.notice('PONG', `${time / 1000}ms`)
+      if (opts.json) {
+        console.log(JSON.stringify({
+          registry: opts.registry,
+          time,
+          details
+        }, null, 2))
+      } else if (Object.keys(details).length) {
+        log.notice('PONG', `${JSON.stringify(details, null, 2)}`)
+      }
+    }
+  })
+}

lib/yargs-modules/ping.js

@@ -0,0 +1,34 @@
+'use strict'
+
+module.exports = {
+  command: 'ping',
+  describe: 'ping registry',
+  builder (yargs) {
+    return yargs.help().alias('help', 'h').options({
+      json: {
+        alias: 'j',
+        default: false,
+        describe: 'Output in JSON format',
+        choices: [false, true]
+      },
+      loglevel: {
+        default: 'warn',
+        describe: 'Logger output level',
+        choices: ['silent', 'error', 'warn', 'http', 'verbose', 'info', 'notice']
+      },
+      silent: {
+        alias: 's',
+        default: false,
+        describe: 'Do not display the PONG response',
+        choices: [false, true]
+      },
+      registry: {
+        alias: 'r',
+        default: 'https://registry.npmjs.org',
+        describe: 'Registry to ping'
+      }
+    })
+  },
+  // lazy-load subcommands
+  handler (argv) { return require('../commands/ping.js')(argv) }
+}