More "programmatic npm" updates.

Building more upon the patch from Charlie Robbins (d7c6982), these changes remove any way of npm actually triggering a program exit than by being called by the cli.

- Move the "exit" option off the opts object and onto a proper config setting.  Why not?
- Use \r\n for most output, so that it'll look correct in the repl, or other places where \n may not be enough.
- Add a comment about loading npm programmatically.

cli.js

@@ -51,30 +51,31 @@ var vindex = arglist.indexOf("-v")
   , printVersion = vindex !== -1 || conf.version
 if (printVersion) {
   sys.puts(npm.version)
-  if (vindex !== -1) arglist.splice(vindex, 1)
+  process.exit(0)
 } else log("npm@"+npm.version, "using")
 
 // make sure that this version of node works with this version of npm.
 var semver = require("./lib/utils/semver")
   , nodeVer = process.version
   , reqVer = npm.nodeVersionRequired
 if (reqVer && !semver.satisfies(nodeVer, reqVer)) {
-  var badNodeVersion = new Error(
-    "npm doesn't work with node " + nodeVer + "\nRequired: node@" + reqVer)
-  throw badNodeVersion
+  errorHandler(new Error(
+    "npm doesn't work with node " + nodeVer + "\nRequired: node@" + reqVer), true)
 }
 
 process.on("uncaughtException", errorHandler)
 
-if (!command && !printVersion) conf.usage = true
+if (!command) conf.usage = true
 
-if (printVersion) itWorked = true
-else {
-  if (conf.usage && command !== "help") {
-    arglist.unshift(command)
-    command = "help"
-  }
-  npm.load({ conf: conf, exit: true }, function (err, loaded) {
-    npm.commands[command](arglist, errorHandler)
-  });
+if (conf.usage && command !== "help") {
+  arglist.unshift(command)
+  command = "help"
 }
+
+// now actually fire up npm and run the command.
+// this is how to use npm programmatically:
+conf._exit = true
+npm.load(conf, function (er) {
+  if (er) return errorHandler(er)
+  npm.commands[command](arglist, errorHandler)
+})

lib/ls.js

@@ -90,7 +90,7 @@ function prettify (data, args) {
   })
   if (!pretty.length) pretty = ["Nothing found"]
   pretty.push("")
-  return pretty.join("\n")
+  return pretty.join("\r\n")
 }
 function merge (installed, remote) {
   var merged = {}

lib/utils/default-config.js

@@ -27,7 +27,7 @@ module.exports =
   , manroot : path.join(process.execPath, "..", "..", "share", "man")
   , editor : process.env.EDITOR
   , tmproot : (process.env.TMPDIR || "/tmp")
-
+  , _exit : true
   //
   // TODO: Fix when node's SSL client can upload properly.
   // , registry : hasSSL ? "https://registry.npmjs.org/"

lib/utils/error-handler.js

@@ -11,16 +11,16 @@ var cbCalled = false
 try { constants = require("constants") }
 catch (ex) { constants = process }
 
-process.on("exit", function () { if (!itWorked) log.win("not ok") })
+process.on("exit", function (code) {
+  if (code) itWorked = false
+  log.win(itWorked ? "ok" : "not ok")
+  itWorked = false // ready for next exit
+})
 
-function errorHandler (er, doExit) {
+function errorHandler (er) {
   if (cbCalled) throw new Error("Callback called more than once.")
   cbCalled = true
-  if (!er) {
-    itWorked = true
-    log.win("ok")
-    return exit(doExit)
-  }
+  if (!er) return exit(0)
   log.error(er)
   if (!(er instanceof Error)) return exit(1)
   if (!er.errno) {
@@ -70,10 +70,15 @@ function errorHandler (er, doExit) {
               ,"Just tweeting a tiny part of the error will not be helpful."
               ].join("\n"))
   }
-  exit(doExit, 1)
+  exit(typeof error.errno === "number" ? err.errno : 1)
 }
 
-function exit (doExit, code) {
-  doExit = doExit || true
-  rm(npm.tmp, function () { if (doExit) process.exit(code || 0) })
+function exit (code) {
+  var doExit = npm.config.get("_exit")
+  log.verbose([code, doExit], "exit")
+  rm(npm.tmp, function () {
+    itWorked = !code
+    if (doExit) process.exit(code || 0)
+    else process.emit("exit", code || 0)
+  })
 }

lib/utils/log.js

@@ -138,7 +138,7 @@ function log (msg, pref, level, cb) {
     msg = msg.split(/\n/).join("\n"+pref+" ")
   }
   msg = pref+" "+msg
-  sys.error(msg)
+  sys.error(msg.split(/\n/).join("\r\n") + "\r")
   cb && cb()
 }
 var spaces = "    "

lib/utils/prompt.js

@@ -24,6 +24,7 @@ function read (def, 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"))

npm.js

@@ -8,7 +8,6 @@ var npm = exports
   , ini = require("./lib/utils/ini")
   , log = require("./lib/utils/log")
   , fs = require("./lib/utils/graceful-fs")
-  , errorHandler = require("./lib/utils/error-handler")
   , path = require("path")
 
 npm.commands = {}
@@ -69,17 +68,15 @@ var commandCache = {}
     }, enumerable: true})
   })
 
-npm.load = function (opts, cb) {
+var loaded = false
+npm.load = function (conf, cb) {
+  if (!cb && typeof conf === "function") cb = conf , conf = {}
+  if (loaded) return cb()
+  loaded = true
   // don't assume that npm is installed in any particular spot, since this
   // might conceivably be a bootstrap attempt.
-  var log = require("./lib/utils/log")
   log.waitForConfig()
-
-  ini.resolveConfigs(conf, function (er) {
-    if (er) return errorHandler(er, opts.exit)
-    npm.config.set("root", ini.get("root"))
-    cb(null, true)
-  })
+  ini.resolveConfigs(conf, cb)
 }
 
 // Local store for package data, so it won't have to be fetched/read more than