install-nix-action/node_modules/arg/index.js

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2019-11-20 03:50:30 +11:00
const flagSymbol = Symbol('arg flag');
function arg(opts, {argv = process.argv.slice(2), permissive = false, stopAtPositional = false} = {}) {
if (!opts) {
throw new Error('Argument specification object is required');
}
const result = {_: []};
const aliases = {};
const handlers = {};
for (const key of Object.keys(opts)) {
if (!key) {
throw new TypeError('Argument key cannot be an empty string');
}
if (key[0] !== '-') {
throw new TypeError(`Argument key must start with '-' but found: '${key}'`);
}
if (key.length === 1) {
throw new TypeError(`Argument key must have a name; singular '-' keys are not allowed: ${key}`);
}
if (typeof opts[key] === 'string') {
aliases[key] = opts[key];
continue;
}
let type = opts[key];
let isFlag = false;
if (Array.isArray(type) && type.length === 1 && typeof type[0] === 'function') {
const [fn] = type;
type = (value, name, prev = []) => {
prev.push(fn(value, name, prev[prev.length - 1]));
return prev;
};
isFlag = fn === Boolean || fn[flagSymbol] === true;
} else if (typeof type === 'function') {
isFlag = type === Boolean || type[flagSymbol] === true;
} else {
throw new TypeError(`Type missing or not a function or valid array type: ${key}`);
}
if (key[1] !== '-' && key.length > 2) {
throw new TypeError(`Short argument keys (with a single hyphen) must have only one character: ${key}`);
}
handlers[key] = [type, isFlag];
}
for (let i = 0, len = argv.length; i < len; i++) {
const wholeArg = argv[i];
if (stopAtPositional && result._.length > 0) {
result._ = result._.concat(argv.slice(i));
break;
}
if (wholeArg === '--') {
result._ = result._.concat(argv.slice(i + 1));
break;
}
if (wholeArg.length > 1 && wholeArg[0] === '-') {
/* eslint-disable operator-linebreak */
const separatedArguments = (wholeArg[1] === '-' || wholeArg.length === 2)
? [wholeArg]
: wholeArg.slice(1).split('').map(a => `-${a}`);
/* eslint-enable operator-linebreak */
for (let j = 0; j < separatedArguments.length; j++) {
const arg = separatedArguments[j];
const [originalArgName, argStr] = arg[1] === '-' ? arg.split(/=(.*)/, 2) : [arg, undefined];
let argName = originalArgName;
while (argName in aliases) {
argName = aliases[argName];
}
if (!(argName in handlers)) {
if (permissive) {
result._.push(arg);
continue;
} else {
const err = new Error(`Unknown or unexpected option: ${originalArgName}`);
err.code = 'ARG_UNKNOWN_OPTION';
throw err;
}
}
const [type, isFlag] = handlers[argName];
if (!isFlag && ((j + 1) < separatedArguments.length)) {
throw new TypeError(`Option requires argument (but was followed by another short argument): ${originalArgName}`);
}
if (isFlag) {
result[argName] = type(true, argName, result[argName]);
} else if (argStr === undefined) {
if (argv.length < i + 2 || (argv[i + 1].length > 1 && argv[i + 1][0] === '-')) {
const extended = originalArgName === argName ? '' : ` (alias for ${argName})`;
throw new Error(`Option requires argument: ${originalArgName}${extended}`);
}
result[argName] = type(argv[i + 1], argName, result[argName]);
++i;
} else {
result[argName] = type(argStr, argName, result[argName]);
}
}
} else {
result._.push(wholeArg);
}
}
return result;
}
arg.flag = fn => {
fn[flagSymbol] = true;
return fn;
};
// Utility types
arg.COUNT = arg.flag((v, name, existingCount) => (existingCount || 0) + 1);
module.exports = arg;