Как массово переименовывать файлы в Node.js

В этом сообщении блога я собираюсь объяснить, как переименовать набор файлов.

Тот же процесс работает для перемещения файлов в другую папку, потому что при переименовании вы переименовываете путь к файлу.

Мотивация для этой задачи заключалась в следующем: в Hugo мы можем писать сообщения в блогах в виде файлов, например:

first-post.md
second-post.md
third-post.md
We can also add them to a folder that contains an index.md file:


first-post/
  > index.md
second-post/
  > index.md
third-post/
  > index.md
The difference is that with folder we can add images and associate them more easily to a blog post.


I could have done the change manually, but I had about 50 files in the folder and I didn’t really want to do that job.


I wanted it to happen automatically.


Let’s start by requiring one core module we’re going to use: fs. As it is a core module, there’s no need to npm install it.


const fs = require('fs')



Then, get a reference to the current folder. I suppose we’re going to run the script in the same folder where we want to perform this change.


__dirname is the variable that always points to the current working folder.


I get a list of all the files and folders:


const files = fs.readdirSync(__dirname)



Then I filter out only the items that end with .md:


for (const file of files) {
  if (file.endsWith('.md')) {
    console.log(file)
  }
}



Once we have the file reference, which represents the filename, we can call fs.rename().


This function accepts 3 parameters:


    

  1. the current path
    2. 

  2. the path we want to move to
    3. 

  3. an callback fired if there’s an error
    4. 



The current path is:


__dirname + '/' + item



The path we want to move to is:


__dirname + '/' + item.replace('.md', '') + '/index.md'



See? We create a new folder from the file name, then we append index.md:


fs.rename(
  __dirname + '/' + item,
  __dirname + '/' + item.replace('.md', '') + '/index.md',
  err => {
    console.log(err)
  }
)



Here’s the full code:


const fs = require('fs')
const files = fs.readdirSync(__dirname)

for (const file of files) {
if (file.endsWith(’.md’)) {
fs.rename(
__dirname + ‘/’ + item,
__dirname + ‘/’ + item.replace(’.md’, ‘’) + ‘/index.md’,
err => {
console.log(err)
}
)
}
}


  

  
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