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99 lines
1.7 KiB
JavaScript
99 lines
1.7 KiB
JavaScript
#!/usr/bin/env node
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'use strict'
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const os = require('os')
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const fs = require('fs')
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const path = require('path')
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const {stdin, stdout, stderr} = process
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try {
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require(path.join(os.homedir(), '.fxrc'))
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} catch (err) {
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if (err.code !== 'MODULE_NOT_FOUND') {
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throw err
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}
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}
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const print = require('./print')
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const reduce = require('./reduce')
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const usage = `
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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 '{"key": "value"}' | fx .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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$ echo '{"foo": 1, "bar": 2}' | fx ?
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["foo", "bar"]
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`
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function main(input) {
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let args = process.argv.slice(2)
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let filename = 'fx'
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if (input === '') {
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if (args.length === 0) {
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stderr.write(usage)
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process.exit(2)
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}
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input = fs.readFileSync(args[0])
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filename = path.basename(args[0])
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args = args.slice(1)
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}
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const json = JSON.parse(input)
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if (args.length === 0 && stdout.isTTY) {
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require('./fx')(filename, json)
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return
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}
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const output = args.reduce(reduce, json)
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if (typeof output === 'undefined') {
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stderr.write('undefined\n')
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} else if (typeof output === 'string') {
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console.log(output)
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} else {
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const [text] = print(output)
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console.log(text)
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}
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}
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function run() {
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stdin.setEncoding('utf8')
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if (stdin.isTTY) {
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main('')
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return
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}
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let buff = ''
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stdin.on('readable', () => {
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let chunk
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while ((chunk = stdin.read())) {
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buff += chunk
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}
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})
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stdin.on('end', () => {
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main(buff)
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})
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}
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run()
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