Using custom diff tool with `git show`

Question

With git I can set a custom diff tool that is used for certain file extensions by the following in .git/config

[diff "csv_diff"]     command = Tools/csv_diff 

and this in .gitattributes (in the root of the repository)

*.csv diff=csv_diff 

This works when using git diff, but it doesn't work with git show. My question is, how do I use a custom tool with git show?

Answer 1

Looks like you're looking for the --ext-diff option.

Here's what git show docs say about it:

--ext-diff

Allow an external diff helper to be executed. If you set an external diff driver with gitattributes, you need to use this option with git-log and friends.