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diff --git a/std/flags/README.md b/std/flags/README.md new file mode 100644 index 000000000..41692b619 --- /dev/null +++ b/std/flags/README.md @@ -0,0 +1,72 @@ +# flags + +Command line arguments parser for Deno based on minimist + +# Example + +```ts +const { args } = Deno; +import { parse } from "https://deno.land/std/flags/mod.ts"; + +console.dir(parse(args)); +``` + +``` +$ deno example.ts -a beep -b boop +{ _: [], a: 'beep', b: 'boop' } +``` + +``` +$ deno example.ts -x 3 -y 4 -n5 -abc --beep=boop foo bar baz +{ _: [ 'foo', 'bar', 'baz' ], + x: 3, + y: 4, + n: 5, + a: true, + b: true, + c: true, + beep: 'boop' } +``` + +# API + +## const parsedArgs = parse(args, options = {}); + +`parsedArgs._` contains all the arguments that didn't have an option associated +with them. + +Numeric-looking arguments will be returned as numbers unless `options.string` or +`options.boolean` is set for that argument name. + +Any arguments after `'--'` will not be parsed and will end up in `parsedArgs._`. + +options can be: + +- `options.string` - a string or array of strings argument names to always treat + as strings +- `options.boolean` - 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`) +- `options.alias` - an object mapping string names to strings or arrays of + string argument names to use as aliases +- `options.default` - an object mapping string argument names to default values +- `options.stopEarly` - when true, populate `parsedArgs._` with everything after + the first non-option +- `options['--']` - when true, populate `parsedArgs._` with everything before + the `--` and `parsedArgs['--']` with everything after the `--`. Here's an + example: + ```ts + const { args } = Deno; + import { parse } from "https://deno.land/std/flags/mod.ts"; + // options['--'] is now set to false + console.dir(parse(args, { "--": false })); + // $ deno example.ts -- a arg1 + // output: { _: [ "example.ts", "a", "arg1" ] } + // options['--'] is now set to true + console.dir(parse(args, { "--": true })); + // $ deno example.ts -- a arg1 + // output: { _: [ "example.ts" ], --: [ "a", "arg1" ] } + ``` +- `options.unknown` - 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`. |