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std/flags/mod.ts

Deno standard library
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// Copyright 2018-2024 the Deno authors. All rights reserved. MIT license.// This module is browser compatible.
/** * Command line arguments parser based on * {@link https://github.com/minimistjs/minimist | minimist}. * * This module is browser compatible. * * @example * ```ts * import { parse } from "https://deno.land/std@$STD_VERSION/flags/mod.ts"; * * console.dir(parse(Deno.args)); * ``` * * @deprecated (will be removed in 1.0.0) Import from * {@link https://deno.land/std/cli/parse_args.ts} instead. * * @module */import { assertExists } from "../assert/assert_exists.ts";
/** Combines recursively all intersection types and returns a new single type. */type Id<TRecord> = TRecord extends Record<string, unknown> ? TRecord extends infer InferredRecord ? { [Key in keyof InferredRecord]: Id<InferredRecord[Key]> } : never : TRecord;
/** Converts a union type `A | B | C` into an intersection type `A & B & C`. */type UnionToIntersection<TValue> = (TValue extends unknown ? (args: TValue) => unknown : never) extends (args: infer R) => unknown ? R extends Record<string, unknown> ? R : never : never;
type BooleanType = boolean | string | undefined;type StringType = string | undefined;type ArgType = StringType | BooleanType;
type Collectable = string | undefined;type Negatable = string | undefined;
type UseTypes< TBooleans extends BooleanType, TStrings extends StringType, TCollectable extends Collectable,> = undefined extends ( & (false extends TBooleans ? undefined : TBooleans) & TCollectable & TStrings) ? false : true;
/** * Creates a record with all available flags with the corresponding type and * default type. */type Values< TBooleans extends BooleanType, TStrings extends StringType, TCollectable extends Collectable, TNegatable extends Negatable, TDefault extends Record<string, unknown> | undefined, TAliases extends Aliases | undefined,> = UseTypes<TBooleans, TStrings, TCollectable> extends true ? & Record<string, unknown> & AddAliases< SpreadDefaults< & CollectValues<TStrings, string, TCollectable, TNegatable> & RecursiveRequired<CollectValues<TBooleans, boolean, TCollectable>> & CollectUnknownValues< TBooleans, TStrings, TCollectable, TNegatable >, DedotRecord<TDefault> >, TAliases > // deno-lint-ignore no-explicit-any : Record<string, any>;
type Aliases<TArgNames = string, TAliasNames extends string = string> = Partial< Record<Extract<TArgNames, string>, TAliasNames | ReadonlyArray<TAliasNames>>>;
type AddAliases< TArgs, TAliases extends Aliases | undefined,> = { [TArgName in keyof TArgs as AliasNames<TArgName, TAliases>]: TArgs[TArgName];};
type AliasNames< TArgName, TAliases extends Aliases | undefined,> = TArgName extends keyof TAliases ? string extends TAliases[TArgName] ? TArgName : TAliases[TArgName] extends string ? TArgName | TAliases[TArgName] : TAliases[TArgName] extends Array<string> ? TArgName | TAliases[TArgName][number] : TArgName : TArgName;
/** * Spreads all default values of Record `TDefaults` into Record `TArgs` * and makes default values required. * * **Example:** * `SpreadValues<{ foo?: boolean, bar?: number }, { foo: number }>` * * **Result:** `{ foo: boolean | number, bar?: number }` */type SpreadDefaults<TArgs, TDefaults> = TDefaults extends undefined ? TArgs : TArgs extends Record<string, unknown> ? & Omit<TArgs, keyof TDefaults> & { [Default in keyof TDefaults]: Default extends keyof TArgs ? (TArgs[Default] & TDefaults[Default] | TDefaults[Default]) extends Record<string, unknown> ? NonNullable<SpreadDefaults<TArgs[Default], TDefaults[Default]>> : TDefaults[Default] | NonNullable<TArgs[Default]> : unknown; } : never;
/** * Defines the Record for the `default` option to add * auto-suggestion support for IDE's. */type Defaults<TBooleans extends BooleanType, TStrings extends StringType> = Id< UnionToIntersection< & Record<string, unknown> // Dedotted auto suggestions: { foo: { bar: unknown } } & MapTypes<TStrings, unknown> & MapTypes<TBooleans, unknown> // Flat auto suggestions: { "foo.bar": unknown } & MapDefaults<TBooleans> & MapDefaults<TStrings> >>;
type MapDefaults<TArgNames extends ArgType> = Partial< Record<TArgNames extends string ? TArgNames : string, unknown>>;
type RecursiveRequired<TRecord> = TRecord extends Record<string, unknown> ? { [Key in keyof TRecord]-?: RecursiveRequired<TRecord[Key]>; } : TRecord;
/** Same as `MapTypes` but also supports collectable options. */type CollectValues< TArgNames extends ArgType, TType, TCollectable extends Collectable, TNegatable extends Negatable = undefined,> = UnionToIntersection< Extract<TArgNames, TCollectable> extends string ? & (Exclude<TArgNames, TCollectable> extends never ? Record<never, never> : MapTypes<Exclude<TArgNames, TCollectable>, TType, TNegatable>) & (Extract<TArgNames, TCollectable> extends never ? Record<never, never> : RecursiveRequired< MapTypes<Extract<TArgNames, TCollectable>, Array<TType>, TNegatable> >) : MapTypes<TArgNames, TType, TNegatable>>;
/** Same as `Record` but also supports dotted and negatable options. */type MapTypes< TArgNames extends ArgType, TType, TNegatable extends Negatable = undefined,> = undefined extends TArgNames ? Record<never, never> : TArgNames extends `${infer Name}.${infer Rest}` ? { [Key in Name]?: MapTypes< Rest, TType, TNegatable extends `${Name}.${infer Negate}` ? Negate : undefined >; } : TArgNames extends string ? Partial< Record<TArgNames, TNegatable extends TArgNames ? TType | false : TType> > : Record<never, never>;
type CollectUnknownValues< TBooleans extends BooleanType, TStrings extends StringType, TCollectable extends Collectable, TNegatable extends Negatable,> = UnionToIntersection< TCollectable extends TBooleans & TStrings ? Record<never, never> : DedotRecord< // Unknown collectable & non-negatable args. & Record< Exclude< Extract<Exclude<TCollectable, TNegatable>, string>, Extract<TStrings | TBooleans, string> >, Array<unknown> > // Unknown collectable & negatable args. & Record< Exclude< Extract<Extract<TCollectable, TNegatable>, string>, Extract<TStrings | TBooleans, string> >, Array<unknown> | false > >>;
/** Converts `{ "foo.bar.baz": unknown }` into `{ foo: { bar: { baz: unknown } } }`. */type DedotRecord<TRecord> = Record<string, unknown> extends TRecord ? TRecord : TRecord extends Record<string, unknown> ? UnionToIntersection< ValueOf< { [Key in keyof TRecord]: Key extends string ? Dedot<Key, TRecord[Key]> : never; } > > : TRecord;
type Dedot<TKey extends string, TValue> = TKey extends `${infer Name}.${infer Rest}` ? { [Key in Name]: Dedot<Rest, TValue> } : { [Key in TKey]: TValue };
type ValueOf<TValue> = TValue[keyof TValue];
/** * The value returned from `parse`. * * @deprecated (will be removed in 1.0.0) Import from * {@link https://deno.land/std/cli/parse_args.ts} instead. */export type Args< // deno-lint-ignore no-explicit-any TArgs extends Record<string, unknown> = Record<string, any>, TDoubleDash extends boolean | undefined = undefined,> = Id< & TArgs & { /** Contains all the arguments that didn't have an option associated with * them. */ _: Array<string | number>; } & (boolean extends TDoubleDash ? DoubleDash : true extends TDoubleDash ? Required<DoubleDash> : Record<never, never>)>;
type DoubleDash = { /** Contains all the arguments that appear after the double dash: "--". */ "--"?: Array<string>;};
/** * The options for the `parse` call. * * @deprecated (will be removed in 1.0.0) Import from * {@link https://deno.land/std/cli/parse_args.ts} instead. */export interface ParseOptions< TBooleans extends BooleanType = BooleanType, TStrings extends StringType = StringType, TCollectable extends Collectable = Collectable, TNegatable extends Negatable = Negatable, TDefault extends Record<string, unknown> | undefined = | Record<string, unknown> | undefined, TAliases extends Aliases | undefined = Aliases | undefined, TDoubleDash extends boolean | undefined = boolean | undefined,> { /** * When `true`, populate the result `_` with everything before the `--` and * the result `['--']` with everything after the `--`. * * @default {false} * * @example * ```ts * // $ deno run example.ts -- a arg1 * import { parse } from "https://deno.land/std@$STD_VERSION/flags/mod.ts"; * console.dir(parse(Deno.args, { "--": false })); * // output: { _: [ "a", "arg1" ] } * console.dir(parse(Deno.args, { "--": true })); * // output: { _: [], --: [ "a", "arg1" ] } * ``` */ "--"?: TDoubleDash;
/** * An object mapping string names to strings or arrays of string argument * names to use as aliases. */ alias?: TAliases;
/** * A boolean, string or array of strings to always treat as booleans. If * `true` will treat all double hyphenated arguments without equal signs as * `boolean` (e.g. affects `--foo`, not `-f` or `--foo=bar`). * All `boolean` arguments will be set to `false` by default. */ boolean?: TBooleans | ReadonlyArray<Extract<TBooleans, string>>;
/** An object mapping string argument names to default values. */ default?: TDefault & Defaults<TBooleans, TStrings>;
/** * When `true`, populate the result `_` with everything after the first * non-option. */ stopEarly?: boolean;
/** A string or array of strings argument names to always treat as strings. */ string?: TStrings | ReadonlyArray<Extract<TStrings, string>>;
/** * A string or array of strings argument names to always treat as arrays. * Collectable options can be used multiple times. All values will be * collected into one array. If a non-collectable option is used multiple * times, the last value is used. * All Collectable arguments will be set to `[]` by default. */ collect?: TCollectable | ReadonlyArray<Extract<TCollectable, string>>;
/** * A string or array of strings argument names which can be negated * by prefixing them with `--no-`, like `--no-config`. */ negatable?: TNegatable | ReadonlyArray<Extract<TNegatable, string>>;
/** * A function which is invoked with a command line parameter not defined in * the `options` configuration object. If the function returns `false`, the * unknown option is not added to `parsedArgs`. */ unknown?: (arg: string, key?: string, value?: unknown) => unknown;}
interface Flags { bools: Record<string, boolean>; strings: Record<string, boolean>; collect: Record<string, boolean>; negatable: Record<string, boolean>; unknownFn: (arg: string, key?: string, value?: unknown) => unknown; allBools: boolean;}
interface NestedMapping { [key: string]: NestedMapping | unknown;}
const { hasOwn } = Object;
function get<TValue>( obj: Record<string, TValue>, key: string,): TValue | undefined { if (hasOwn(obj, key)) { return obj[key]; }}
function getForce<TValue>(obj: Record<string, TValue>, key: string): TValue { const v = get(obj, key); assertExists(v); return v;}
function isNumber(x: unknown): boolean { if (typeof x === "number") return true; if (/^0x[0-9a-f]+$/i.test(String(x))) return true; return /^[-+]?(?:\d+(?:\.\d*)?|\.\d+)(e[-+]?\d+)?$/.test(String(x));}
function hasKey(obj: NestedMapping, keys: string[]): boolean { let o = obj; keys.slice(0, -1).forEach((key) => { o = (get(o, key) ?? {}) as NestedMapping; });
const key = keys.at(-1); return key !== undefined && hasOwn(o, key);}
/** * Take a set of command line arguments, optionally with a set of options, and * return an object representing the flags found in the passed arguments. * * By default, any arguments starting with `-` or `--` are considered boolean * flags. If the argument name is followed by an equal sign (`=`) it is * considered a key-value pair. Any arguments which could not be parsed are * available in the `_` property of the returned object. * * By default, the flags module tries to determine the type of all arguments * automatically and the return type of the `parse` method will have an index * signature with `any` as value (`{ [x: string]: any }`). * * If the `string`, `boolean` or `collect` option is set, the return value of * the `parse` method will be fully typed and the index signature of the return * type will change to `{ [x: string]: unknown }`. * * Any arguments after `'--'` will not be parsed and will end up in `parsedArgs._`. * * Numeric-looking arguments will be returned as numbers unless `options.string` * or `options.boolean` is set for that argument name. * * @example * ```ts * import { parse } from "https://deno.land/std@$STD_VERSION/flags/mod.ts"; * const parsedArgs = parse(Deno.args); * ``` * * @example * ```ts * import { parse } from "https://deno.land/std@$STD_VERSION/flags/mod.ts"; * const parsedArgs = parse(["--foo", "--bar=baz", "./quux.txt"]); * // parsedArgs: { foo: true, bar: "baz", _: ["./quux.txt"] } * ``` * * @deprecated (will be removed in 1.0.0) Use * {@linkcode https://deno.land/std/cli/parse_args.ts?s=parseArgs | parseArgs} * instead. */export function parse< TArgs extends Values< TBooleans, TStrings, TCollectable, TNegatable, TDefaults, TAliases >, TDoubleDash extends boolean | undefined = undefined, TBooleans extends BooleanType = undefined, TStrings extends StringType = undefined, TCollectable extends Collectable = undefined, TNegatable extends Negatable = undefined, TDefaults extends Record<string, unknown> | undefined = undefined, TAliases extends Aliases<TAliasArgNames, TAliasNames> | undefined = undefined, TAliasArgNames extends string = string, TAliasNames extends string = string,>( args: string[], { "--": doubleDash = false, alias = {} as NonNullable<TAliases>, boolean = false, default: defaults = {} as TDefaults & Defaults<TBooleans, TStrings>, stopEarly = false, string = [], collect = [], negatable = [], unknown = (i: string): unknown => i, }: ParseOptions< TBooleans, TStrings, TCollectable, TNegatable, TDefaults, TAliases, TDoubleDash > = {},): Args<TArgs, TDoubleDash> { const aliases: Record<string, string[]> = {}; const flags: Flags = { bools: {}, strings: {}, unknownFn: unknown, allBools: false, collect: {}, negatable: {}, };
if (alias !== undefined) { for (const key in alias) { const val = getForce(alias, key); if (typeof val === "string") { aliases[key] = [val]; } else { aliases[key] = val as Array<string>; } const aliasesForKey = getForce(aliases, key); for (const alias of aliasesForKey) { aliases[alias] = [key].concat(aliasesForKey.filter((y) => alias !== y)); } } }
if (boolean !== undefined) { if (typeof boolean === "boolean") { flags.allBools = !!boolean; } else { const booleanArgs: ReadonlyArray<string> = typeof boolean === "string" ? [boolean] : boolean;
for (const key of booleanArgs.filter(Boolean)) { flags.bools[key] = true; const alias = get(aliases, key); if (alias) { for (const al of alias) { flags.bools[al] = true; } } } } }
if (string !== undefined) { const stringArgs: ReadonlyArray<string> = typeof string === "string" ? [string] : string;
for (const key of stringArgs.filter(Boolean)) { flags.strings[key] = true; const alias = get(aliases, key); if (alias) { for (const al of alias) { flags.strings[al] = true; } } } }
if (collect !== undefined) { const collectArgs: ReadonlyArray<string> = typeof collect === "string" ? [collect] : collect;
for (const key of collectArgs.filter(Boolean)) { flags.collect[key] = true; const alias = get(aliases, key); if (alias) { for (const al of alias) { flags.collect[al] = true; } } } }
if (negatable !== undefined) { const negatableArgs: ReadonlyArray<string> = typeof negatable === "string" ? [negatable] : negatable;
for (const key of negatableArgs.filter(Boolean)) { flags.negatable[key] = true; const alias = get(aliases, key); if (alias) { for (const al of alias) { flags.negatable[al] = true; } } } }
const argv: Args = { _: [] };
function argDefined(key: string, arg: string): boolean { return ( (flags.allBools && /^--[^=]+$/.test(arg)) || get(flags.bools, key) || !!get(flags.strings, key) || !!get(aliases, key) ); }
function setKey( obj: NestedMapping, name: string, value: unknown, collect = true, ) { let o = obj; const keys = name.split("."); keys.slice(0, -1).forEach(function (key) { if (get(o, key) === undefined) { o[key] = {}; } o = get(o, key) as NestedMapping; });
const key = keys.at(-1)!; const collectable = collect && !!get(flags.collect, name);
if (!collectable) { o[key] = value; } else if (get(o, key) === undefined) { o[key] = [value]; } else if (Array.isArray(get(o, key))) { (o[key] as unknown[]).push(value); } else { o[key] = [get(o, key), value]; } }
function setArg( key: string, val: unknown, arg: string | undefined = undefined, collect?: boolean, ) { if (arg && flags.unknownFn && !argDefined(key, arg)) { if (flags.unknownFn(arg, key, val) === false) return; }
const value = !get(flags.strings, key) && isNumber(val) ? Number(val) : val; setKey(argv, key, value, collect);
const alias = get(aliases, key); if (alias) { for (const x of alias) { setKey(argv, x, value, collect); } } }
function aliasIsBoolean(key: string): boolean { return getForce(aliases, key).some( (x) => typeof get(flags.bools, x) === "boolean", ); }
let notFlags: string[] = [];
// all args after "--" are not parsed if (args.includes("--")) { notFlags = args.slice(args.indexOf("--") + 1); args = args.slice(0, args.indexOf("--")); }
for (let i = 0; i < args.length; i++) { const arg = args[i]; assertExists(arg);
if (/^--.+=/.test(arg)) { const m = arg.match(/^--([^=]+)=(.*)$/s); assertExists(m); const [, key, value] = m; assertExists(key);
if (flags.bools[key]) { const booleanValue = value !== "false"; setArg(key, booleanValue, arg); } else { setArg(key, value, arg); } } else if ( /^--no-.+/.test(arg) && get(flags.negatable, arg.replace(/^--no-/, "")) ) { const m = arg.match(/^--no-(.+)/); assertExists(m); assertExists(m[1]); setArg(m[1], false, arg, false); } else if (/^--.+/.test(arg)) { const m = arg.match(/^--(.+)/); assertExists(m); assertExists(m[1]); const [, key] = m; const next = args[i + 1]; if ( next !== undefined && !/^-/.test(next) && !get(flags.bools, key) && !flags.allBools && (get(aliases, key) ? !aliasIsBoolean(key) : true) ) { setArg(key, next, arg); i++; } else if (next !== undefined && (next === "true" || next === "false")) { setArg(key, next === "true", arg); i++; } else { setArg(key, get(flags.strings, key) ? "" : true, arg); } } else if (/^-[^-]+/.test(arg)) { const letters = arg.slice(1, -1).split("");
let broken = false; for (const [j, letter] of letters.entries()) { const next = arg.slice(j + 2);
if (next === "-") { setArg(letter, next, arg); continue; }
if (/[A-Za-z]/.test(letter) && next.includes("=")) { setArg(letter, next.split(/=(.+)/)[1], arg); broken = true; break; }
if ( /[A-Za-z]/.test(letter) && /-?\d+(\.\d*)?(e-?\d+)?$/.test(next) ) { setArg(letter, next, arg); broken = true; break; }
if (letters[j + 1]?.match(/\W/)) { setArg(letter, arg.slice(j + 2), arg); broken = true; break; } else { setArg(letter, get(flags.strings, letter) ? "" : true, arg); } }
const key = arg.at(-1)!; if (!broken && key !== "-") { const nextArg = args[i + 1]; if ( nextArg && !/^(-|--)[^-]/.test(nextArg) && !get(flags.bools, key) && (get(aliases, key) ? !aliasIsBoolean(key) : true) ) { setArg(key, nextArg, arg); i++; } else if (nextArg && (nextArg === "true" || nextArg === "false")) { setArg(key, nextArg === "true", arg); i++; } else { setArg(key, get(flags.strings, key) ? "" : true, arg); } } } else { if (!flags.unknownFn || flags.unknownFn(arg) !== false) { argv._.push(flags.strings["_"] ?? !isNumber(arg) ? arg : Number(arg)); } if (stopEarly) { argv._.push(...args.slice(i + 1)); break; } } }
for (const [key, value] of Object.entries(defaults)) { if (!hasKey(argv, key.split("."))) { setKey(argv, key, value, false);
const alias = aliases[key]; if (alias !== undefined) { for (const x of alias) { setKey(argv, x, value, false); } } } }
for (const key of Object.keys(flags.bools)) { if (!hasKey(argv, key.split("."))) { const value = get(flags.collect, key) ? [] : false; setKey( argv, key, value, false, ); } }
for (const key of Object.keys(flags.strings)) { if (!hasKey(argv, key.split(".")) && get(flags.collect, key)) { setKey( argv, key, [], false, ); } }
if (doubleDash) { argv["--"] = []; for (const key of notFlags) { argv["--"].push(key); } } else { for (const key of notFlags) { argv._.push(key); } }
return argv as Args<TArgs, TDoubleDash>;}