265 lines
8.1 KiB
JavaScript
265 lines
8.1 KiB
JavaScript
import t from '../node_modules/typical/index.mjs'
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/**
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* @module option-definition
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*/
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/**
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* Describes a command-line option. Additionally, if generating a usage guide with [command-line-usage](https://github.com/75lb/command-line-usage) you could optionally add `description` and `typeLabel` properties to each definition.
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*
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* @alias module:option-definition
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* @typicalname option
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*/
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class OptionDefinition {
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constructor (definition) {
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/**
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* The only required definition property is `name`, so the simplest working example is
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* ```js
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* const optionDefinitions = [
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* { name: 'file' },
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* { name: 'depth' }
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* ]
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* ```
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*
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* Where a `type` property is not specified it will default to `String`.
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*
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* | # | argv input | commandLineArgs() output |
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* | --- | -------------------- | ------------ |
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* | 1 | `--file` | `{ file: null }` |
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* | 2 | `--file lib.js` | `{ file: 'lib.js' }` |
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* | 3 | `--depth 2` | `{ depth: '2' }` |
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*
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* Unicode option names and aliases are valid, for example:
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* ```js
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* const optionDefinitions = [
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* { name: 'один' },
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* { name: '两' },
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* { name: 'три', alias: 'т' }
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* ]
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* ```
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* @type {string}
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*/
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this.name = definition.name
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/**
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* The `type` value is a setter function (you receive the output from this), enabling you to be specific about the type and value received.
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*
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* The most common values used are `String` (the default), `Number` and `Boolean` but you can use a custom function, for example:
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*
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* ```js
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* const fs = require('fs')
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*
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* class FileDetails {
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* constructor (filename) {
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* this.filename = filename
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* this.exists = fs.existsSync(filename)
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* }
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* }
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*
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* const cli = commandLineArgs([
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* { name: 'file', type: filename => new FileDetails(filename) },
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* { name: 'depth', type: Number }
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* ])
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* ```
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*
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* | # | argv input | commandLineArgs() output |
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* | --- | ----------------- | ------------ |
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* | 1 | `--file asdf.txt` | `{ file: { filename: 'asdf.txt', exists: false } }` |
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*
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* The `--depth` option expects a `Number`. If no value was set, you will receive `null`.
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*
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* | # | argv input | commandLineArgs() output |
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* | --- | ----------------- | ------------ |
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* | 2 | `--depth` | `{ depth: null }` |
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* | 3 | `--depth 2` | `{ depth: 2 }` |
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*
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* @type {function}
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* @default String
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*/
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this.type = definition.type || String
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/**
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* getopt-style short option names. Can be any single character (unicode included) except a digit or hyphen.
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*
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* ```js
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* const optionDefinitions = [
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* { name: 'hot', alias: 'h', type: Boolean },
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* { name: 'discount', alias: 'd', type: Boolean },
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* { name: 'courses', alias: 'c' , type: Number }
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* ]
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* ```
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*
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* | # | argv input | commandLineArgs() output |
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* | --- | ------------ | ------------ |
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* | 1 | `-hcd` | `{ hot: true, courses: null, discount: true }` |
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* | 2 | `-hdc 3` | `{ hot: true, discount: true, courses: 3 }` |
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*
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* @type {string}
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*/
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this.alias = definition.alias
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/**
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* Set this flag if the option takes a list of values. You will receive an array of values, each passed through the `type` function (if specified).
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*
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* ```js
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* const optionDefinitions = [
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* { name: 'files', type: String, multiple: true }
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* ]
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* ```
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*
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* Note, examples 1 and 3 below demonstrate "greedy" parsing which can be disabled by using `lazyMultiple`.
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*
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* | # | argv input | commandLineArgs() output |
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* | --- | ------------ | ------------ |
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* | 1 | `--files one.js two.js` | `{ files: [ 'one.js', 'two.js' ] }` |
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* | 2 | `--files one.js --files two.js` | `{ files: [ 'one.js', 'two.js' ] }` |
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* | 3 | `--files *` | `{ files: [ 'one.js', 'two.js' ] }` |
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*
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* @type {boolean}
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*/
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this.multiple = definition.multiple
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/**
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* Identical to `multiple` but with greedy parsing disabled.
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*
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* ```js
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* const optionDefinitions = [
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* { name: 'files', lazyMultiple: true },
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* { name: 'verbose', alias: 'v', type: Boolean, lazyMultiple: true }
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* ]
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* ```
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*
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* | # | argv input | commandLineArgs() output |
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* | --- | ------------ | ------------ |
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* | 1 | `--files one.js --files two.js` | `{ files: [ 'one.js', 'two.js' ] }` |
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* | 2 | `-vvv` | `{ verbose: [ true, true, true ] }` |
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*
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* @type {boolean}
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*/
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this.lazyMultiple = definition.lazyMultiple
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/**
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* Any values unaccounted for by an option definition will be set on the `defaultOption`. This flag is typically set on the most commonly-used option to make for more concise usage (i.e. `$ example *.js` instead of `$ example --files *.js`).
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*
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* ```js
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* const optionDefinitions = [
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* { name: 'files', multiple: true, defaultOption: true }
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* ]
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* ```
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*
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* | # | argv input | commandLineArgs() output |
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* | --- | ------------ | ------------ |
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* | 1 | `--files one.js two.js` | `{ files: [ 'one.js', 'two.js' ] }` |
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* | 2 | `one.js two.js` | `{ files: [ 'one.js', 'two.js' ] }` |
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* | 3 | `*` | `{ files: [ 'one.js', 'two.js' ] }` |
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*
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* @type {boolean}
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*/
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this.defaultOption = definition.defaultOption
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/**
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* An initial value for the option.
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*
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* ```js
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* const optionDefinitions = [
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* { name: 'files', multiple: true, defaultValue: [ 'one.js' ] },
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* { name: 'max', type: Number, defaultValue: 3 }
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* ]
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* ```
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*
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* | # | argv input | commandLineArgs() output |
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* | --- | ------------ | ------------ |
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* | 1 | | `{ files: [ 'one.js' ], max: 3 }` |
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* | 2 | `--files two.js` | `{ files: [ 'two.js' ], max: 3 }` |
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* | 3 | `--max 4` | `{ files: [ 'one.js' ], max: 4 }` |
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*
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* @type {*}
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*/
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this.defaultValue = definition.defaultValue
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/**
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* When your app has a large amount of options it makes sense to organise them in groups.
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*
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* There are two automatic groups: `_all` (contains all options) and `_none` (contains options without a `group` specified in their definition).
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*
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* ```js
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* const optionDefinitions = [
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* { name: 'verbose', group: 'standard' },
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* { name: 'help', group: [ 'standard', 'main' ] },
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* { name: 'compress', group: [ 'server', 'main' ] },
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* { name: 'static', group: 'server' },
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* { name: 'debug' }
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* ]
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* ```
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*
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*<table>
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* <tr>
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* <th>#</th><th>Command Line</th><th>commandLineArgs() output</th>
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* </tr>
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* <tr>
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* <td>1</td><td><code>--verbose</code></td><td><pre><code>
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*{
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* _all: { verbose: true },
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* standard: { verbose: true }
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*}
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*</code></pre></td>
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* </tr>
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* <tr>
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* <td>2</td><td><code>--debug</code></td><td><pre><code>
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*{
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* _all: { debug: true },
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* _none: { debug: true }
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*}
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*</code></pre></td>
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* </tr>
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* <tr>
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* <td>3</td><td><code>--verbose --debug --compress</code></td><td><pre><code>
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*{
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* _all: {
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* verbose: true,
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* debug: true,
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* compress: true
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* },
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* standard: { verbose: true },
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* server: { compress: true },
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* main: { compress: true },
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* _none: { debug: true }
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*}
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*</code></pre></td>
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* </tr>
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* <tr>
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* <td>4</td><td><code>--compress</code></td><td><pre><code>
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*{
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* _all: { compress: true },
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* server: { compress: true },
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* main: { compress: true }
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*}
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*</code></pre></td>
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* </tr>
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*</table>
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*
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* @type {string|string[]}
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*/
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this.group = definition.group
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/* pick up any remaining properties */
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for (let prop in definition) {
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if (!this[prop]) this[prop] = definition[prop]
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}
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}
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isBoolean () {
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return this.type === Boolean || (t.isFunction(this.type) && this.type.name === 'Boolean')
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}
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isMultiple () {
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return this.multiple || this.lazyMultiple
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}
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static create (def) {
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const result = new this(def)
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return result
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}
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}
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export default OptionDefinition
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