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Give loader options access to loader context #4

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Give loader options access to loader context #4

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35 changes: 33 additions & 2 deletions lib/index.js
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Original file line number Diff line number Diff line change
Expand Up @@ -4,7 +4,7 @@ const Joi = require('joi')
module.exports = function (source) {
this.cacheable && this.cacheable(true)

const _opts = this.query || {}
const _opts = parseOptions.call(this, this.query) || {}
const schema = Joi.object().keys({
filename: Joi.string().default(this.resourcePath),
pretty: Joi.boolean().default(true),
Expand All @@ -16,14 +16,45 @@ module.exports = function (source) {
compiler: Joi.func(),
parser: Joi.func(),
globals: Joi.array().single(),
locals: Joi.object()
locals: [Joi.object(), Joi.func()]
})

// validate options
const validated = Joi.validate(_opts, schema)
if (validated.error) { throw validated.error }
const opts = validated.value

// Allows any option to be passed as a function which gets webpack's context
// as its first argument, in case some info from the loader context is necessary. Courtesy of Reshape-Loader.
function parseOptions (opts) {
return removeEmpty({
plugins: convertFn.call(this, opts.plugins),
locals: convertFn.call(this, opts.locals),
filename: convertFn.call(this, opts.filename),
parserOptions: convertFn.call(this, opts.parserOptions),
generatorOptions: convertFn.call(this, opts.generatorOptions),
runtime: convertFn.call(this, opts.runtime),
parser: convertFnSpecial.call(this, opts.parser),
multi: convertFn.call(this, opts.multi)
})
}

//Passes context to functions
function convertFn (opt) {
return typeof opt === 'function' ? opt(this) : opt
}

//Pass context to function if convert is true.
function convertFnSpecial (opt) {
return typeof opt === 'function' && opt.convert ? opt(this) : opt
}

//Remove empty elements from objects
function removeEmpty (obj) {
Object.keys(obj).forEach((key) => (obj[key] == null) && delete obj[key])
return obj
}

// compile the template to a function
const tpl = pug.compile(source, opts)

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