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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,161 @@ | ||
| const cli = { | ||
| _prog: {}, | ||
| _args: [], | ||
| program: (option = {}) => { | ||
| cli._prog = option | ||
| return cli | ||
| }, | ||
| argument: (flag, option = {}) => { | ||
| // name or flags - Either a name or a list of option strings, e.g. foo or -f, --foo. | ||
| // dest - The name of the attribute to be added to the object returned by parse_args(). | ||
|
|
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| // nargs - The number of command-line arguments that should be consumed. // N, ?, *, +, REMAINDER | ||
| // action - The basic type of action to be taken when this argument is encountered at the command line. // store, store_true, store_false, append, append_const, count | ||
|
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| // const - A constant value required by some action and nargs selections. (supporting store_const and append_const action) | ||
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| // metavar - A name for the argument in usage messages. | ||
| // help - A brief description of what the argument does. | ||
|
|
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| // required - Whether or not the command-line option may be omitted (optionals only). | ||
| // default - The value produced if the argument is absent from the command line. | ||
| // type - The type to which the command-line argument should be converted. | ||
| // choices - A container of the allowable values for the argument. | ||
|
|
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| flag = Array.isArray(flag) ? flag : [flag] | ||
| option.flag = flag | ||
| option.positional = !flag[0].startsWith('-') | ||
| option.action = option.action || 'store' | ||
| option.dest = option.dest || flag.slice(-1)[0].toLowerCase().replace(/^-+/, '').replace(/-[a-z]/g, character => character.slice(1).toUpperCase()) | ||
| option.help = option.help || {'help': 'output usage information', 'version': 'output the version number'}[option.action] | ||
| cli._args.push(option) | ||
| return cli | ||
| }, | ||
| parse: argv => { | ||
| let optionals = {}, positionals = cli._args.map((option, index) => option.positional ? index : null).filter(index => index !== null) | ||
| cli._args.forEach((option, index) => {if(!option.positional){option.flag.forEach(flag => optionals[flag] = index)}}) | ||
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| cli._prog.name = cli._prog.name || require('path').parse(argv[1]).base | ||
| let args = argv.slice(2) | ||
| .reduce((result, part) => /^-[^-]/.test(part) ? result.concat(part.slice(1).split('').map(string => '-' + string)) : result.concat(part), []) | ||
|
|
||
| let pointer = 0 | ||
| while(pointer < args.length) { | ||
| let value = args[pointer] | ||
| let picked = null | ||
| let index = value.startsWith('-') ? optionals[value] : positionals.shift() | ||
| if(index == undefined) value.startsWith('-') ? error(`no such option: ${value}`) : error(`extra arguments found: ${value}`) | ||
| if(value.startsWith('-')) pointer += 1 | ||
| let action = cli._args[index].action | ||
|
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| let step = args.slice(pointer).findIndex(part => part in optionals) | ||
| let next = step === -1 ? args.length : step + pointer | ||
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| if(['help', 'version'].includes(action)){ | ||
| if(action === 'help') help() | ||
| else if(action === 'version') version() | ||
| } | ||
| else if(['store_true', 'store_false'].includes(action)){ | ||
| picked = action === 'store_true' | ||
| } | ||
| else{ | ||
| picked = args.slice(pointer, next) | ||
| if(picked.length === 0){ | ||
| cli._args[index].positional ? | ||
| error(`the following arguments are required: ${value}`) : | ||
| error(`arguments: ${value} expected at least one argument`) | ||
| } | ||
| if(cli._args[index].nargs != '+'){ | ||
| picked = picked[0] | ||
| pointer += 1 | ||
| } | ||
| else{ | ||
| pointer = next | ||
| } | ||
| } | ||
| cli[cli._args[index].dest] = picked | ||
| } | ||
| if(positionals.length){ | ||
| error(`the following arguments are required: ${positionals.map(index => cli._args[index].flag[0]).join(', ')}`) | ||
| } | ||
| // cli._args.forEach(option => console.log(option.dest, cli[option.dest])) | ||
| return cli | ||
| } | ||
| } | ||
|
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| const pad = length => (new Array(length + 1)).join(' ') | ||
|
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| const usage = () => { | ||
| let options = cli._args.map(option => { | ||
| let flag = option.flag[0] | ||
| let name = option.metavar || option.dest | ||
| if(option.positional){ | ||
| if(option.nargs === '+') | ||
| return `${name} [${name} ...]` | ||
| else | ||
| return `${name}` | ||
| } | ||
| else{ | ||
| if(['store_true', 'store_false', 'help', 'version'].includes(option.action)) | ||
| return `[${flag}]` | ||
| else if(option.nargs === '+') | ||
| return `[${flag} ${name} [${name} ...]]` | ||
| else | ||
| return `[${flag} ${name}]` | ||
| } | ||
| }).map(name => ' ' + name) | ||
| let maximum = 80 | ||
| let prefix = `usage: ${cli._prog.name}` | ||
| let lines = [prefix] | ||
|
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| options.forEach(option => { | ||
| lines[lines.length - 1].length + option.length < maximum ? | ||
| lines[lines.length - 1] += option : | ||
| lines.push(pad(prefix.length) + option) | ||
| }) | ||
| console.log(lines.join('\n')) | ||
| } | ||
|
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| const help = () => { | ||
| usage() | ||
| let positionals = cli._args.filter(option => option.positional) | ||
| .map(option => [option.metavar || option.dest, option.help]) | ||
| let optionals = cli._args.filter(option => !option.positional) | ||
| .map(option => { | ||
| let flags = option.flag | ||
| let name = option.metavar || option.dest | ||
| let use = '' | ||
| if(['store_true', 'store_false', 'help', 'version'].includes(option.action)) | ||
| use = flags.map(flag => `${flag}`).join(', ') | ||
| else if(option.nargs === '+') | ||
| use = flags.map(flag => `${flag} ${name} [${name} ...]`).join(', ') | ||
| else | ||
| use = flags.map(flag => `${flag} ${name}`).join(', ') | ||
| return [use, option.help] | ||
| }) | ||
| let align = Math.max.apply(null, positionals.concat(optionals).map(option => option[0].length)) | ||
| align = align > 26 ? 26 : align | ||
| const publish = option => { | ||
| option[0].length > align ? | ||
| console.log(` ${option[0]}\n${pad(align + 4)}${option[1]}`) : | ||
| console.log(` ${option[0]}${pad(align - option[0].length)} ${option[1]}`) | ||
| } | ||
| if(positionals.length) console.log('\npositional arguments:') | ||
| positionals.forEach(publish) | ||
| if(optionals.length) console.log('\noptional arguments:') | ||
| optionals.forEach(publish) | ||
| process.exit() | ||
| } | ||
|
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| const version = () => { | ||
| console.log(cli._prog.version) | ||
| process.exit() | ||
| } | ||
|
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| const error = message => { | ||
| usage() | ||
| console.log(cli._prog.name + ':', 'error:', message) | ||
| process.exit(1) | ||
| } | ||
|
|
||
| module.exports = cli |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
|
|
@@ -21,7 +21,5 @@ | |
| }, | ||
| "author": "nondanee", | ||
| "license": "MIT", | ||
| "dependencies": { | ||
| "commander": "^2.18.0" | ||
| } | ||
| "dependencies": {} | ||
| } | ||
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