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69 lines
1.4 KiB
JavaScript
69 lines
1.4 KiB
JavaScript
#!/usr/bin/env node
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'use strict';
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const meow = require('meow')
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const stdin = require('get-stdin')
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const cardinal = require('cardinal')
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const theme = require('cardinal/themes/tomorrow-night')
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const cli = meow(`
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Usage
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$ fx [code ...]
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Examples
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$ echo '{"key": "value"}' | fx 'x => x.key'
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"value"
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$ echo '[1,2,3]' | fx 'this.map(x => x * 2)'
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[2, 4, 6]
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$ echo '{"items": ["one", "two"]}' | fx 'this.items' 'this[1]'
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"two"
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$ echo '{"count": 0}' | fx '{...this, count: 1}'
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{"count": 1}
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`)
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const highlight = process.stdout.isTTY ? cardinal.highlight : x => x
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async function main() {
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const text = await stdin()
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if (text === '') {
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cli.showHelp()
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}
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const json = JSON.parse(text)
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const result = cli.input.reduce(reduce, json)
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if (typeof result === 'undefined') {
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console.log(undefined)
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} else {
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const text = JSON.stringify(result, null, 4)
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console.log(highlight(text, {theme}))
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}
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}
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function reduce(json, code) {
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if (/^\w+\s*=>/.test(code)) {
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const fx = eval(code)
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return fx(json)
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} else if (/yield/.test(code)) {
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const fx = eval(`
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function fn() {
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const gen = (function*(){
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${code.replace(/\\\n/g, '')}
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}).call(this)
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return [...gen]
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}; fn
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`)
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return fx.call(json)
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} else {
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const fx = eval(`function fn() { return ${code} }; fn`)
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return fx.call(json)
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}
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}
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main()
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