/
chunkFiles.js
52 lines (47 loc) · 1.84 KB
/
chunkFiles.js
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
'use strict'
const debug = require('debug')('lint-staged:chunkFiles')
const normalize = require('normalize-path')
const path = require('path')
/**
* Chunk array into sub-arrays
* @param {Array} arr
* @param {Number} chunkCount
* @retuns {Array<Array>}
*/
function chunkArray(arr, chunkCount) {
if (chunkCount === 1) return [arr]
const chunked = []
let position = 0
for (let i = 0; i < chunkCount; i++) {
const chunkLength = Math.ceil((arr.length - position) / (chunkCount - i))
chunked.push([])
chunked[i] = arr.slice(position, chunkLength + position)
position += chunkLength
}
return chunked
}
/**
* Chunk files into sub-arrays based on the length of the resulting argument string
* @param {Object} opts
* @param {Array<String>} opts.files
* @param {String} [opts.baseDir] The optional base directory to resolve relative paths.
* @param {number} [opts.maxArgLength] the maximum argument string length
* @param {Boolean} [opts.relative] whether files are relative to `gitDir` or should be resolved as absolute
* @returns {Array<Array<String>>}
*/
module.exports = function chunkFiles({ files, baseDir, maxArgLength = null, relative = false }) {
const normalizedFiles = files.map((file) =>
normalize(relative || !baseDir ? file : path.resolve(baseDir, file))
)
if (!maxArgLength) {
debug('Skip chunking files because of undefined maxArgLength')
return [normalizedFiles] // wrap in an array to return a single chunk
}
const fileListLength = normalizedFiles.join(' ').length
debug(
`Resolved an argument string length of ${fileListLength} characters from ${normalizedFiles.length} files`
)
const chunkCount = Math.min(Math.ceil(fileListLength / maxArgLength), normalizedFiles.length)
debug(`Creating ${chunkCount} chunks for maxArgLength of ${maxArgLength}`)
return chunkArray(normalizedFiles, chunkCount)
}