@material-ui-core-inliner.js

const fs = require('fs')
const path = require('path')
const os = require('os')
const minimatch = require('minimatch')

const options = { matchBase: true }

const commit = process.argv[2] === 'commit'

const trim = x => x.trim()

const gitignore = fs.readFileSync(path.resolve(process.cwd(), '.gitignore'), { encoding: 'utf8' })
    .split(os.EOL)
    .map(trim)
    .filter(Boolean)
    .filter(x => !x.startsWith('#'))

gitignore.push('.git')

const ignore = gitignore
    .map(pattern => new minimatch.Minimatch(pattern, options))

const filter = file => {
    return !ignore.some(matcher => matcher.match('/' + file))
}

var isJS = new minimatch.Minimatch("*.{js,jsx}", { matchBase: true })

const recurseDir = (p) => {
    const files = fs.readdirSync(path.join(process.cwd(), p))
        .map(x => path.join(p, x))
        .filter(filter)

    for (let i = 0; i < files.length; i++) {
        const file = files[i];

        const stat = fs.lstatSync(file)

        if (stat.isDirectory()) {
            recurseDir(file)
        } else if (isJS.match(file)) {
            processFile(file)
        }
    }

}

const hasMaterialUIComponentInName = line => line.includes('@material-ui/core\'') || line.includes('@material-ui/core"')

const processFile = file => {
    const lines = fs.readFileSync(file, { encoding: 'utf8' })
        .split(os.EOL)

    const newLines = lines.map(line => {
        if (hasMaterialUIComponentInName(line)) {
            const importParser = /import\s+{(\s+.+)}\s+from\s+/

            const result = line.match(importParser)
            if (!result) {
                console.warn(`Unable to parse line "${line}". Please format this line manually`)
                return line
            }
            const [_, cg] = result
            const components = cg.split(',').map(trim)

            const newLines = []

            for (let i = 0; i < components.length; i++) {
                const component = components[i];
                if (component === 'withStyles') {
                    newLines.push('import { withStyles } from \'@material-ui/core/styles\'')
                } else if (component === 'makeStyles') {
                    newLines.push('import { makeStyles } from \'@material-ui/core/styles\'')
                } else {
                    newLines.push(`import ${component} from \'@material-ui/core/${component}\'`)
                }
            }

            console.log(`Transformed material ui lines to \n    ${newLines.join(',\n    ')}`)

            return newLines.join(os.EOL)
        } else {
            return line
        }
    })

    const newContents = newLines.join(os.EOL)

    if (commit) {
        fs.writeFileSync(path.join(process.cwd(), file), newContents)
    }
}

recurseDir('.')

if (!commit) {
    console.log('Please pass "commit" to this command to prevent a dry run. Remember to git commit or backup before running this command.')
}