Implement --proxy and --https-proxy as pass-throughs to npm.

This fixes issue #80.

README.md

@@ -24,6 +24,10 @@ UPDATE for v.next.
     `cd path/to/my/package; npmunbox --install=. path/to/box.npmbox`
   * New unbox option `--scripts` to enable running of scripts. (By default,
     npmbox acts like `--ignore-scripts` was specified.)
+  * New options `--proxy` and `--https-proxy` which pass through to the
+    underlying `npm` invocation. Works on both `npmbox` and `npmunbox`. In the
+    latter case, this can help prevent unboxing from inadvertently hitting the
+    network (by specifying nonexistent proxies).
 
 UPDATE December 21, 2016: v4.1.0 of npmbox is out.
   * Support for running npmbox on a top-level local package, e.g.
@@ -59,6 +63,8 @@ Given some package, like `express` this command will create a archive file of th
         -v, --verbose         Shows npm output which is normally hidden.
         -s, --silent          Shows no output whatsoever.
         -t, --target          Specify the .npmbox file to write.
+        --proxy=<url>         npm --proxy switch.
+        --https-proxy=<url>   npm --https-proxy switch.
 
 You must specify at least one package. Packages can be anything accepted as
 an argument to `npm install`, and can also be a local path to a `.json` file,
@@ -98,6 +104,8 @@ Given some .npmbox file (must end with the .npmbox extension), installs the cont
         -O, --save-optional   npm --save-optional switch.
         -B, --save-bundle     npm --save-bundle switch.
         -E, --save-exact      npm --save-exact switch.
+        --proxy=<url>         npm --proxy switch.
+        --https-proxy=<url>   npm --https-proxy switch.
 
 You must specify at least one file.
 

npmbox.js

@@ -8,6 +8,10 @@
 var boxxer = require("./npmboxxer.js");
 
 var argv = require("optimist")
+	.string([
+		"proxy",
+		"https-proxy"
+	])
 	.boolean(["v","verbose","s","silent"])
 	.options("t", {
 		alias: "target",
@@ -29,14 +33,18 @@ if (args.length<1 || argv.help) {
 	console.log("  -v, --verbose         Shows additional output which is normally hidden.");
 	console.log("  -s, --silent          Hide all output.");
 	console.log("  -t, --target          Specify the target .npmbox file to write.");
+	console.log("  --proxy=<url>         npm --proxy switch.");
+	console.log("  --https-proxy=<url>   npm --https-proxy switch.");
 	console.log("");
 	process.exit(0);
 }
 
 var options = {
 	verbose: argv.v || argv.verbose || false,
 	silent: argv.s || argv.silent || false,
-	target: argv.t || argv.target || null
+	target: argv.t || argv.target || null,
+	proxy: argv.proxy || null,
+	"https-proxy": argv["https-proxy"] || null
 };
 
 var sources = args;

npmboxxer.js

@@ -357,6 +357,8 @@
 				"ignore-scripts": true,
 				loglevel: options && options.verbose ? "http" : "silent"
 			};
+			if (options.proxy) npmoptions.proxy = options.proxy;
+			if (options["https-proxy"]) npmoptions["https-proxy"] = options["https-proxy"];
 
 			npmInit(npmoptions,function(err){
 				if (err) return done(err);

npmunbox.js

@@ -10,7 +10,9 @@ var utils = require("./utils");
 
 var argv = require("optimist")
 	.string([
-		"C","prefix"
+		"C","prefix",
+		"proxy",
+		"https-proxy"
 	])
 	.boolean([
 		"v","verbose",
@@ -55,6 +57,8 @@ if (args.length<1 || argv.help) {
 	console.log("  -O, --save-optional   npm --save-optional switch.");
 	console.log("  -B, --save-bundle     npm --save-bundle switch.");
 	console.log("  -E, --save-exact      npm --save-exact switch.");
+	console.log("  --proxy=<url>         npm --proxy switch.");
+	console.log("  --https-proxy=<url>   npm --https-proxy switch.");
 	console.log("");
 	process.exit(0);
 }
@@ -72,6 +76,8 @@ var options = {
 	path: argv.p || argv.path || false
 };
 if (argv.C || argv.prefix) options.prefix = argv.C || argv.prefix;
+if (argv.proxy) options.proxy = argv.proxy;
+if (argv["https-proxy"]) options["https-proxy"] = argv["https-proxy"];
 
 var errorCount = 0;
 var sources = args.filter(function(source){