Add support to preserve formatting (preserve tabs)

[glensc]

I have tab indent formatted composer.json, each time composer-git-merge-driver is merging, the formatting is replaced with space indent.

[balbuf]

@glensc these bits of logic were supposed to match the indentation and preserve the specific type of indentation (and in the case the case of spaces, the appropriate width), but I guess it isn't working properly?
https://github.com/balbuf/composer-git-merge-driver/blob/master/bin/composer-git-merge-driver#L27-L29
https://github.com/balbuf/composer-git-merge-driver/blob/master/bin/composer-git-merge-driver#L230-L235

It's limited in its ability because it just matches a sample line and extrapolates for the rest of the file, so if there's a mixture of spaces/tabs or other nonstandard indentation (or if the indentation type was changed during the merge), it's not going to faithfully preserve the indentation. If you want to look into what the issue is, those would be the places to start.

[glensc]

@balbuf thanks for the investigation. I've converted muy files to space indent, so this is no longer bothering me.

ps:

🚧 Never link to branches, share a permalink 🚧

• see https://news.ycombinator.com/item?id=8046710
  and https://help.github.com/articles/getting-permanent-links-to-files/
  and https://docs.gitlab.com/ee/user/shortcuts.html#project-files
• hit y
• and perhaps for https://github.com/josephfrazier/octopermalinker (GitHub)