stripped down code and a passing test from optimist

index.js

@@ -0,0 +1,169 @@
+module.exports = function (args, opts) {
+    if (!opts) opts = {};
+
+    var flags = { bools : {}, strings : {} };
+
+    [].concat(opts['boolean']).filter(Boolean).forEach(function (key) {
+        flags.bools[key] = true;
+    });
+
+    [].concat(opts.string).filter(Boolean).forEach(function (key) {
+        flags.strings[key] = true;
+    });
+
+    var aliases = {};
+    Object.keys(opts.alias || {}).forEach(function (key) {
+        aliases[key] = [].concat(opts.alias[key]);
+        aliases[key].forEach(function (x) {
+            aliases[x] = [key].concat(aliases[key].filter(function (y) {
+                return x !== y;
+            }));
+        });
+    });
+
+    var defaults = opts['default'] || {};
+
+    var argv = { _ : [] };
+    Object.keys(flags.bools).forEach(function (key) {
+        setArg(key, defaults[key] || false);
+    });
+
+    function setArg (key, val) {
+        var value = !flags.strings[key] && isNumber(val)
+            ? Number(val) : val
+        ;
+        setKey(argv, key.split('.'), value);
+
+        (aliases[key] || []).forEach(function (x) {
+            argv[x] = argv[key];
+        });
+    }
+
+    for (var i = 0; i < args.length; i++) {
+        var arg = args[i];
+
+        if (arg === '--') {
+            argv._.push.apply(argv._, args.slice(i + 1));
+            break;
+        }
+        else if (arg.match(/^--.+=/)) {
+            // Using [\s\S] instead of . because js doesn't support the
+            // 'dotall' regex modifier. See:
+            // http://stackoverflow.com/a/1068308/13216
+            var m = arg.match(/^--([^=]+)=([\s\S]*)$/);
+            setArg(m[1], m[2]);
+        }
+        else if (arg.match(/^--no-.+/)) {
+            var key = arg.match(/^--no-(.+)/)[1];
+            setArg(key, false);
+        }
+        else if (arg.match(/^--.+/)) {
+            var key = arg.match(/^--(.+)/)[1];
+            var next = args[i + 1];
+            if (next !== undefined && !next.match(/^-/)
+            && !flags.bools[key]
+            && (aliases[key] ? !flags.bools[aliases[key]] : true)) {
+                setArg(key, next);
+                i++;
+            }
+            else if (/^(true|false)$/.test(next)) {
+                setArg(key, next === 'true');
+                i++;
+            }
+            else {
+                setArg(key, true);
+            }
+        }
+        else if (arg.match(/^-[^-]+/)) {
+            var letters = arg.slice(1,-1).split('');
+
+            var broken = false;
+            for (var j = 0; j < letters.length; j++) {
+                var next = arg.slice(j+2);
+
+                if (next === '-') {
+                    setArg(letters[j], next)
+                    continue;
+                }
+
+                if (/[A-Za-z]/.test(letters[j])
+                && /-?\d+(\.\d*)?(e-?\d+)?$/.test(next)) {
+                    setArg(letters[j], next);
+                    break;
+                }
+
+                if (letters[j+1] && letters[j+1].match(/\W/)) {
+                    setArg(letters[j], arg.slice(j+2));
+                    broken = true;
+                    break;
+                }
+                else {
+                    setArg(letters[j], true);
+                }
+            }
+
+            var key = arg.slice(-1)[0];
+            if (!broken && key !== '-') {
+
+                if (args[i+1] && !/^(-|--)[^-]/.test(args[i+1])
+                && !flags.bools[key]
+                && (aliases[key] ? !flags.bools[aliases[key]] : true)) {
+                    setArg(key, args[i+1]);
+                    i++;
+                }
+                else if (args[i+1] && /true|false/.test(args[i+1])) {
+                    setArg(key, args[i+1] === 'true');
+                    i++;
+                }
+                else {
+                    setArg(key, true);
+                }
+            }
+        }
+        else {
+            argv._.push(
+                flags.strings['_'] || !isNumber(arg) ? arg : Number(arg)
+            );
+        }
+    }
+
+    Object.keys(defaults).forEach(function (key) {
+        if (!(key in argv)) {
+            argv[key] = defaults[key];
+            if (key in aliases) {
+                argv[aliases[key]] = defaults[key];
+            }
+        }
+    });
+
+    return argv;
+};
+
+function setKey (obj, keys, value) {
+    var o = obj;
+    keys.slice(0,-1).forEach(function (key) {
+        if (o[key] === undefined) o[key] = {};
+        o = o[key];
+    });
+
+    var key = keys[keys.length - 1];
+    if (o[key] === undefined || typeof o[key] === 'boolean') {
+        o[key] = value;
+    }
+    else if (Array.isArray(o[key])) {
+        o[key].push(value);
+    }
+    else {
+        o[key] = [ o[key], value ];
+    }
+}
+
+function isNumber (x) {
+    if (typeof x === 'number') return true;
+    if (/^0x[0-9a-f]+$/i.test(x)) return true;
+    return /^[-+]?(?:\d+(?:\.\d*)?|\.\d+)(e[-+]?\d+)?$/.test(x);
+}
+
+function longest (xs) {
+    return Math.max.apply(null, xs.map(function (x) { return x.length }));
+}

test/dash.js

@@ -0,0 +1,17 @@
+var parse = require('../');
+var test = require('tape');
+
+test('-', function (t) {
+    t.plan(5);
+    t.deepEqual(parse([ '-n', '-' ]), { n: '-', _: [] });
+    t.deepEqual(parse([ '-' ]), { _: [ '-' ] });
+    t.deepEqual(parse([ '-f-' ]), { f: '-', _: [] });
+    t.deepEqual(
+        parse([ '-b', '-' ], { boolean: 'b' }),
+        { b: true, _: [ '-' ] }
+    );
+    t.deepEqual(
+        parse([ '-s', '-' ], { string: 's' }),
+        { s: '-', _: [] }
+    );
+});