Pandoc: Shift every block code block by 2 spaces (or 4 spaces)

Pandoc: Shift every block code block by 2 spaces (or 4 spaces)

[Nikhil Agarwal]

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I write a lot of code within a list such as follows:

---

- The general method to edit a file, assuming **command** is the command 
that edits the file, is something along these lines:

```bash
$ command file > tempfile && mv tempfile file
# or, depending on how "command" reads its input
$ command < file > tempfile && mv tempfile file
```

- To prepend data to a file, similarly do:

```bash
$ { command; cat file; } > tempfile && mv tempfile file
```

  where **command** is the command that produces the output that should be 
prepended to the file.

- The use of "&&" ensures that the original file is overwritten only if no 
errors occurred during the processing. That is to safeguard the original 
data in case something goes wrong. If preserving the original inode number 
(and thus permissions and other metadata) is a concern, there are various 
ways, here are two:

```bash
$ command file > tempfile && cat tempfile > file && rm tempfile
# or
$ cp file tempfile && command tempfile > file && rm tempfile
```

---

How can I write a Pandoc filter, that shifts all the codeblock (that start 
at column 0) by 2 spaces (or 4 spaces if the previous list has a number 
like `#.  ` or `1.  ` or `10. `) ?

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