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Move to stream operators #2

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Move to stream operators #2

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70 changes: 49 additions & 21 deletions lib/functions.js
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Original file line number Diff line number Diff line change
Expand Up @@ -44,26 +44,50 @@ async function compress(params) {
} = params;

const handlers = [
filter(item => item.dirent.isFile()),
filter(item => extWhiteList.includes(path.extname(item.direntPath))),
fileSize && map(async item => {
const stat = await fsp.stat(item.direntPath);
return {
...item,
size: stat.size
}
}),
fileSize && filter(item => item.size > fileSize),
switchMap(function* (item) {
for (const format of formats) {
yield {
{
condition: true,
operator: 'filter',
handler: item => item.dirent.isFile()
},
{
condition: true,
operator: 'filter',
handler: item => extWhiteList.includes(path.extname(item.direntPath))
},
{
condition: fileSize,
operator: 'map',
handler: async item => {
const stat = await fsp.stat(item.direntPath);
return {
...item,
format
size: stat.size
}
}
},
{
condition: fileSize,
operator: 'filter',
handler: item => item.size > fileSize
},
{
condition: true,
operator: 'flatMap',
handler: function* (item) {
for (const format of formats) {
yield {
...item,
format
}
}
}
}),
parallel({
concurrency,
},
{
condition: true,
operator: 'forEach',
options: {
concurrency
},
handler: async (item) => {
const fromPath = item.direntPath;
const relativePath = path.relative(from, fromPath);
Expand All @@ -74,11 +98,15 @@ async function compress(params) {

return createCompressStream({ fromPath, toPath, format: item.format });
}
}),
].filter(Boolean);
}
].filter(handlerData => handlerData.condition);

const iterable = pipe(...handlers)(walk(from));
return subscribe(iterable, x => x);
return handlers.reduce(
(currentStream, handlerData) => {
return currentStream[handlerData.operator](handlerData.handler, handlerData.options)
},
stream.Readable.from(walk(from))
)
}


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