Function writeTreeChanges

src/utils/walkerToTreeEntryMap.js:94–197

({
  fs,
  dir,
  gitdir,
  treePair, // [TREE({ ref: 'HEAD' }), 'STAGE'] would be the equivalent of `git write-tree`
})

}

export async function writeTreeChanges({
  fs,
  dir,
  gitdir,
  treePair, // [TREE({ ref: 'HEAD' }), 'STAGE'] would be the equivalent of `git write-tree`
}) {
  const isStage = treePair[1] === 'stage'
  const trees = treePair.map(t => (typeof t === 'string' ? _TreeMap[t]() : t))

  const changedEntries = []
  // transform WalkerEntry objects into the desired format
  const map = async (filepath, [head, stage]) => {
    if (
      filepath === '.' ||
      (await GitIgnoreManager.isIgnored({ fs, dir, gitdir, filepath }))
    ) {
      return
    }

    if (stage) {
      if (
        !head ||
        ((await head.oid()) !== (await stage.oid()) &&
          (await stage.oid()) !== undefined)
      ) {
        changedEntries.push([head, stage])
      }
      return {
        mode: await stage.mode(),
        path: filepath,
        oid: await stage.oid(),
        type: await stage.type(),
      }
    }
  }

  // combine mapped entries with their parent results
  const reduce = async (parent, children) => {
    children = children.filter(Boolean) // Remove undefined entries
    if (!parent) {
      return children.length > 0 ? children : undefined
    } else {
      parent.children = children
      return parent
    }
  }

  // if parent is skipped, skip the children
  const iterate = async (walk, children) => {
    const filtered = []
    for (const child of children) {
      const [head, stage] = child
      if (isStage) {
        if (stage) {
          // for deleted file in work dir, it also needs to be added on stage
          if (await fs.exists(`${dir}/${stage.toString()}`)) {
            filtered.push(child)
          } else {