npm: Add ping command

Fixes #5750

PR-URL: https://github.com/npm/npm/pull/5788

2 files changed, 19 insertions, 0 deletions

diff --git a/lib/npm.js b/lib/npm.js
index 180e3d4bf..30a42412d 100644
--- a/lib/npm.js
+++ b/lib/npm.js
@@ -138,6 +138,7 @@
     'bin',
     'whoami',
     'dist-tag',
+    'ping',
 
     'test',
     'stop',
diff --git a/lib/ping.js b/lib/ping.js
new file mode 100644
index 000000000..9a07d93a5
--- /dev/null
+++ b/lib/ping.js
@@ -0,0 +1,18 @@
+var npm = require('./npm.js')
+
+module.exports = ping
+
+ping.usage = 'npm ping\nping registry'
+
+function ping (args, silent, cb) {
+  if (typeof cb !== 'function') {
+    cb = silent
+    silent = false
+  }
+  var registry = npm.config.get('registry')
+  if (!registry) return cb(new Error('no default registry set'))
+
+  npm.registry.ping(registry, function (er, pong) {
+    cb(er, er ? null : pong)
+  })
+}