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'use strict';
const path = require('path');
const Promise = require('bluebird')
const fs = Promise.promisifyAll(require('fs'))
const spawn = require('cross-spawn')
const debug = require('debug')('purs-loader');
const dargs = require('./dargs');
function compile(psModule) {
const options = psModule.options
const cache = psModule.cache
const stderr = []
if (cache.compilationStarted) return Promise.resolve(psModule)
cache.compilationStarted = true
const args = dargs(Object.assign({
_: options.src,
output: options.output,
}, options.pscArgs))
debug('spawning compiler %s %o', options.psc, args)
return (new Promise((resolve, reject) => {
debug('compiling PureScript...')
const compilation = spawn(options.psc, args)
compilation.stderr.on('data', data => {
stderr.push(data.toString());
});
compilation.on('close', code => {
debug('finished compiling PureScript.')
cache.compilationFinished = true
if (code !== 0) {
const errorMessage = stderr.join('');
if (errorMessage.length) {
psModule.emitError(errorMessage);
}
reject(new Error('compilation failed'))
} else {
const warningMessage = stderr.join('');
if (options.warnings && warningMessage.length) {
psModule.emitWarning(warningMessage);
}
resolve(psModule)
}
})
}))
.then(compilerOutput => {
if (options.bundle) {
return bundle(options, cache).then(() => psModule)
}
return psModule
})
}
module.exports.compile = compile;
function bundle(options, cache) {
if (cache.bundle) return Promise.resolve(cache.bundle)
const stdout = []
const stderr = cache.bundle = []
const args = dargs(Object.assign({
_: [path.join(options.output, '*', '*.js')],
output: options.bundleOutput,
namespace: options.bundleNamespace,
}, options.pscBundleArgs))
cache.bundleModules.forEach(name => args.push('--module', name))
debug('spawning bundler %s %o', options.pscBundle, args.join(' '))
return (new Promise((resolve, reject) => {
debug('bundling PureScript...')
const compilation = spawn(options.pscBundle, args)
compilation.stdout.on('data', data => stdout.push(data.toString()))
compilation.stderr.on('data', data => stderr.push(data.toString()))
compilation.on('close', code => {
debug('finished bundling PureScript.')
if (code !== 0) {
const errorMessage = stderr.join('');
if (errorMessage.length) {
psModule.emitError(errorMessage);
}
return reject(new Error('bundling failed'))
}
cache.bundle = stderr
resolve(fs.appendFileAsync(options.bundleOutput, `module.exports = ${options.bundleNamespace}`))
})
}))
}
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