Add support for variable renaming

[pomeh]

If you really want to "be the best JavaScript code formatter" (and I want you to become it because I need this tool !!), esformatter should definitely support renaming variable in some form. To understand what I mean you have to check out this online but closed-source JavaScript formatter: http://www.jsnice.org. There are two things involved in this tool:

• renaming local variable (based on some sort of neural network I guess, or any kind of memory, artificial intelligence or whatever)
• interactive variable renaming, which allow you to rename a variable in the formatted code

I don't know if esformatter could support this second point in any form but if yes it would be really, really powerful :)

[pgilad]

Actually jsfmt which is based on this project does variable renaming...

[leobalter]

This is not the target for esformatter. But it can be achieved using its dependecy: rocambole.

You can check a module I made as example: https://github.com/leobalter/rocambole-method-rename. It's not exactly what you want but it's on the same way.

Also, the acorn is promising as a good JS parser to solve the variable renaming problem.

[pomeh]

Ok I understand, it's not esformatter's job to do variable renaming.

@pgilad @leobalter thanks for the links, I didn't know about jsmft, rocambole and acorn.

[twolfson]

I have completed esformatter-rename which should work for this functionality

https://github.com/twolfson/esformatter-rename

[millermedeiros]

another plugin: https://github.com/twolfson/esformatter-phonetic