/
postProcessPattern.js
196 lines (162 loc) · 5.46 KB
/
postProcessPattern.js
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import path from 'path';
import crypto from 'crypto';
import loaderUtils from 'loader-utils';
import cacache from 'cacache';
import serialize from 'serialize-javascript';
import findCacheDir from 'find-cache-dir';
import normalizePath from 'normalize-path';
import { name, version } from '../package.json';
import { stat, readFile } from './utils/promisify';
/* eslint-disable no-param-reassign */
export default function postProcessPattern(globalRef, pattern, file) {
const {
logger,
compilation,
fileDependencies,
written,
inputFileSystem,
copyUnmodified,
} = globalRef;
logger.debug(`getting stats for '${file.absoluteFrom}' to write to assets`);
return stat(inputFileSystem, file.absoluteFrom).then((stats) => {
// We don't write empty directories
if (stats.isDirectory()) {
logger.debug(
`skipping '${file.absoluteFrom}' because it is empty directory`
);
return Promise.resolve();
}
// If this came from a glob, add it to the file watchlist
if (pattern.fromType === 'glob') {
fileDependencies.add(file.absoluteFrom);
}
logger.debug(`reading '${file.absoluteFrom}' to write to assets`);
return readFile(inputFileSystem, file.absoluteFrom)
.then((content) => {
if (pattern.transform) {
logger.info(`transforming content for '${file.absoluteFrom}'`);
// eslint-disable-next-line no-shadow
const transform = (content, absoluteFrom) =>
pattern.transform(content, absoluteFrom);
if (pattern.cache) {
if (!globalRef.cacheDir) {
globalRef.cacheDir = findCacheDir({
name: 'copy-webpack-plugin',
});
}
const cacheKey = pattern.cache.key
? pattern.cache.key
: serialize({
name,
version,
pattern,
hash: crypto
.createHash('md4')
.update(content)
.digest('hex'),
});
return cacache.get(globalRef.cacheDir, cacheKey).then(
(result) => {
logger.debug(
`getting cached transformation for '${file.absoluteFrom}'`
);
return result.data;
},
() =>
Promise.resolve()
.then(() => transform(content, file.absoluteFrom))
// eslint-disable-next-line no-shadow
.then((content) => {
logger.debug(
`caching transformation for '${file.absoluteFrom}'`
);
return cacache
.put(globalRef.cacheDir, cacheKey, content)
.then(() => content);
})
);
}
content = transform(content, file.absoluteFrom);
}
return content;
})
.then((content) => {
if (pattern.toType === 'template') {
logger.info(
`interpolating template '${file.webpackTo}' for '${
file.relativeFrom
}'`
);
// If it doesn't have an extension, remove it from the pattern
// ie. [name].[ext] or [name][ext] both become [name]
if (!path.extname(file.relativeFrom)) {
file.webpackTo = file.webpackTo.replace(/\.?\[ext\]/g, '');
}
file.webpackTo = loaderUtils.interpolateName(
{ resourcePath: file.absoluteFrom },
file.webpackTo,
{
content,
regExp: file.webpackToRegExp,
context: pattern.context,
}
);
}
return content;
})
.then((content) => {
if (pattern.transformPath) {
logger.info(
`transforming path '${file.webpackTo}' for '${file.absoluteFrom}'`
);
return Promise.resolve(
pattern.transformPath(file.webpackTo, file.absoluteFrom)
)
.then((newPath) => {
// Developers can use invalid slashes we should fix it
file.webpackTo = normalizePath(newPath);
})
.then(() => content);
}
return content;
})
.then((content) => {
const hash = loaderUtils.getHashDigest(content);
if (
!copyUnmodified &&
written[file.webpackTo] &&
written[file.webpackTo][file.absoluteFrom] &&
written[file.webpackTo][file.absoluteFrom] === hash
) {
logger.info(
`skipping '${file.webpackTo}', because content hasn't changed`
);
return;
}
logger.debug(`adding '${file.webpackTo}' for tracking content changes`);
if (!written[file.webpackTo]) {
written[file.webpackTo] = {};
}
written[file.webpackTo][file.absoluteFrom] = hash;
if (compilation.assets[file.webpackTo] && !file.force) {
logger.info(
`skipping '${file.webpackTo}', because it already exists`
);
return;
}
logger.info(
`writing '${file.webpackTo}' to compilation assets from '${
file.absoluteFrom
}'`
);
compilation.assets[file.webpackTo] = {
size() {
return stats.size;
},
source() {
return content;
},
};
});
});
}