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options.js
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107 lines (100 loc) · 3.83 KB
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// type | meaning
// -----|---------------
// b | boolean
// i | integer
// f | float
// s | string
// I | integer array
// F | float array
// S | string array
/** Parses the specified command line arguments according to the given configuration. */
function parse(argv, config) {
var options = {};
var unknown = [];
var arguments = [];
var trailing = [];
// make an alias map and initialize defaults
var aliases = {};
Object.keys(config).forEach(key => {
var option = config[key];
if (option.alias != null) {
if (typeof option.alias === "string") aliases[option.alias] = key;
else if (Array.isArray(option.alias)) option.alias.forEach(alias => aliases[alias] = key);
}
if (option.default != null) options[key] = option.default;
});
// iterate over argv
for (var i = 0, k = (argv = argv.slice()).length; i < k; ++i) {
let arg = argv[i];
if (arg == "--") { ++i; break; }
let match = /^(?:(\-\w)(?:=(.*))?|(\-\-\w{2,})(?:=(.*))?)$/.exec(arg), option, key;
if (match) {
if (config[arg]) option = config[key = arg]; // exact
else if (match[1] != null) { // alias
option = config[key = aliases[match[1].substring(1)]];
if (option && match[2] != null) argv[i--] = match[2];
} else if (match[3] != null) { // full
option = config[key = match[3].substring(2)];
if (option && match[4] != null) argv[i--] = match[4];
}
} else {
if (arg.charCodeAt(0) == 45) option = config[key = arg]; // exact
else { arguments.push(arg); continue; } // argument
}
if (option) {
if (option.type == null || option.type === "b") options[key] = true; // flag
else {
if (i + 1 < argv.length && argv[i + 1].charCodeAt(0) != 45) { // present
switch (option.type) {
case "i": options[key] = parseInt(argv[++i], 10); break;
case "I": options[key] = (options[key] || []).concat(parseInt(argv[++i], 10)); break;
case "f": options[key] = parseFloat(argv[++i]); break;
case "F": options[key] = (options[key] || []).concat(parseFloat(argv[++i])); break;
case "s": options[key] = String(argv[++i]); break;
case "S": options[key] = (options[key] || []).concat(argv[++i].split(",")); break;
default: unknown.push(arg); --i;
}
} else { // omitted
switch (option.type) {
case "i":
case "f": options[key] = option.default || 0; break;
case "s": options[key] = option.default || ""; break;
case "I":
case "F":
case "S": options[key] = options.default || []; break;
default: unknown.push(arg);
}
}
}
if (option.value) Object.keys(option.value).forEach(k => options[k] = option.value[k]);
} else unknown.push(arg);
}
while (i < k) trailing.push(argv[i++]); // trailing
return { options, unknown, arguments, trailing };
}
exports.parse = parse;
/** Generates the help text for the specified configuration. */
function help(config, options) {
if (!options) options = {};
var indent = options.indent || 2;
var padding = options.padding || 24;
var eol = options.eol || "\n";
var sb = [];
Object.keys(config).forEach(key => {
var option = config[key];
if (option.description == null) return;
var text = "";
while (text.length < indent) text += " ";
text += "--" + key;
if (option.alias) text += ", -" + option.alias;
while (text.length < padding) text += " ";
if (Array.isArray(option.description)) {
sb.push(text + option.description[0] + option.description.slice(1).map(line => {
for (let i = 0; i < padding; ++i) line = " " + line;
return eol + line;
}).join(""));
} else sb.push(text + option.description);
});
return sb.join(eol);
}
exports.help = help;