134 lines
4.8 KiB
JavaScript
Executable File
134 lines
4.8 KiB
JavaScript
Executable File
(function(){
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var LONG_FLAG, MULTI_FLAG, OPTIONAL, OptionParser, SHORT_FLAG, build_rule, build_rules, normalize_arguments;
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// A simple **OptionParser** class to parse option flags from the command-line.
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// Use it like so:
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// parser: new OptionParser switches, help_banner
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// options: parser.parse process.argv
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exports.OptionParser = (function() {
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OptionParser = function OptionParser(rules, banner) {
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this.banner = banner;
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this.rules = build_rules(rules);
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return this;
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};
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// Initialize with a list of valid options, in the form:
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// [short-flag, long-flag, description]
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// Along with an an optional banner for the usage help.
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// Parse the list of arguments, populating an `options` object with all of the
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// specified options, and returning it. `options.arguments` will be an array
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// containing the remaning non-option arguments. This is a simpler API than
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// many option parsers that allow you to attach callback actions for every
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// flag. Instead, you're responsible for interpreting the options object.
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OptionParser.prototype.parse = function parse(args) {
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var _a, _b, _c, arg, is_option, matched_rule, options, rule;
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arguments = Array.prototype.slice.call(arguments, 0);
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options = {
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arguments: []
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};
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args = normalize_arguments(args);
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while (arg = args.shift()) {
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is_option = !!(arg.match(LONG_FLAG) || arg.match(SHORT_FLAG));
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matched_rule = false;
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_a = this.rules;
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for (_b = 0, _c = _a.length; _b < _c; _b++) {
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rule = _a[_b];
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if (rule.short_flag === arg || rule.long_flag === arg) {
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options[rule.name] = rule.has_argument ? args.shift() : true;
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matched_rule = true;
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break;
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}
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}
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if (is_option && !matched_rule) {
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throw new Error("unrecognized option: " + arg);
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}
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if (!(is_option)) {
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options.arguments.push(arg);
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}
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}
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return options;
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};
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// Return the help text for this **OptionParser**, listing and describing all
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// of the valid options, for `--help` and such.
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OptionParser.prototype.help = function help() {
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var _a, _b, _c, _d, _e, _f, _g, _h, i, let_part, lines, rule, spaces;
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lines = ['Available options:'];
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if (this.banner) {
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lines.unshift('' + this.banner + "\n");
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}
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_a = this.rules;
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for (_b = 0, _c = _a.length; _b < _c; _b++) {
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rule = _a[_b];
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spaces = 15 - rule.long_flag.length;
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spaces = spaces > 0 ? (function() {
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_d = []; _g = 0; _h = spaces;
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for (_f = 0, i = _g; (_g <= _h ? i <= _h : i >= _h); (_g <= _h ? i += 1 : i -= 1), _f++) {
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_d.push(' ');
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}
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return _d;
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}).call(this).join('') : '';
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let_part = rule.short_flag ? rule.short_flag + ', ' : ' ';
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lines.push(" " + let_part + (rule.long_flag) + spaces + (rule.description));
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}
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return "\n" + (lines.join('\n')) + "\n";
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};
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return OptionParser;
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}).call(this);
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// Helpers
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// -------
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// Regex matchers for option flags.
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LONG_FLAG = /^(--\w[\w\-]+)/;
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SHORT_FLAG = /^(-\w)/;
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MULTI_FLAG = /^-(\w{2,})/;
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OPTIONAL = /\[(.+)\]/;
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// Build and return the list of option rules. If the optional *short-flag* is
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// unspecified, leave it out by padding with `null`.
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build_rules = function build_rules(rules) {
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var _a, _b, _c, _d, tuple;
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_a = []; _b = rules;
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for (_c = 0, _d = _b.length; _c < _d; _c++) {
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tuple = _b[_c];
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_a.push((function() {
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if (tuple.length < 3) {
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tuple.unshift(null);
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}
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return build_rule.apply(this, tuple);
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}).call(this));
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}
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return _a;
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};
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// Build a rule from a `-o` short flag, a `--output [DIR]` long flag, and the
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// description of what the option does.
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build_rule = function build_rule(short_flag, long_flag, description) {
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var match;
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match = long_flag.match(OPTIONAL);
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long_flag = long_flag.match(LONG_FLAG)[1];
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return {
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name: long_flag.substr(2),
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short_flag: short_flag,
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long_flag: long_flag,
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description: description,
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has_argument: !!(match && match[1])
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};
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};
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// Normalize arguments by expanding merged flags into multiple flags. This allows
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// you to have `-wl` be the same as `--watch --lint`.
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normalize_arguments = function normalize_arguments(args) {
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var _a, _b, _c, _d, _e, _f, arg, l, match, result;
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args = args.slice(0);
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result = [];
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_a = args;
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for (_b = 0, _c = _a.length; _b < _c; _b++) {
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arg = _a[_b];
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if ((match = arg.match(MULTI_FLAG))) {
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_d = match[1].split('');
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for (_e = 0, _f = _d.length; _e < _f; _e++) {
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l = _d[_e];
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result.push('-' + l);
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}
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} else {
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result.push(arg);
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}
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}
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return result;
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};
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})();
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