1 files changed, 69 insertions, 0 deletions
diff --git a/deps/npm/lib/utils/prompt.js b/deps/npm/lib/utils/prompt.js
new file mode 100644
index 0000000000..d23e4ac587
--- /dev/null
+++ b/deps/npm/lib/utils/prompt.js
@@ -0,0 +1,69 @@
+
+module.exports = prompt
+
+var log = require("./log.js")
+  , buffer = ""
+  , tty = require("tty")
+
+function prompt (p, def, silent, cb) {
+  if (!cb) cb = silent, silent = false
+  if (!cb) cb = def, def = null
+  if (def) p += "("+(silent ? "<hidden>" : def)+") "
+  var r = (silent ? silentRead : read).bind(null, def, cb)
+  if (!process.stdout.write(p)) process.stdout.on("drain", function D () {
+    process.stdout.removeListener("drain", D)
+    r()
+  })
+  else r()
+}
+
+function read (def, cb) {
+  var stdin = process.openStdin()
+    , val = ""
+  stdin.resume()
+  stdin.setEncoding("utf8")
+  stdin.on("error", cb)
+  stdin.on("data", function D (chunk) {
+    val += buffer + chunk
+    buffer = ""
+    val = val.replace(/\r/g, '')
+    if (val.indexOf("\n") !== -1) {
+      if (val !== "\n") val = val.replace(/^\n+/, "")
+      buffer = val.substr(val.indexOf("\n"))
+      val = val.substr(0, val.indexOf("\n"))
+      stdin.pause()
+      stdin.removeListener("data", D)
+      stdin.removeListener("error", cb)
+      val = val.trim() || def
+      cb(null, val)
+    }
+  })
+}
+
+function silentRead (def, cb) {
+  var stdin = process.openStdin()
+    , val = ""
+  tty.setRawMode(true)
+  stdin.resume()
+  stdin.on("error", cb)
+  stdin.on("data", function D (c) {
+    c = "" + c
+    switch (c) {
+      case "\n": case "\r": case "\r\n": case "\u0004":
+        tty.setRawMode(false)
+        stdin.removeListener("data", D)
+        stdin.removeListener("error", cb)
+        val = val.trim() || def
+        process.stdout.write("\n")
+        stdin.pause()
+        return cb(null, val)
+      case "\u0003": case "\0":
+        return cb("cancelled")
+        break
+      default:
+        val += buffer + c
+        buffer = ""
+        break
+    }
+  })
+}