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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?
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Type git config diff. tool winmerge . Verify it worked by typing git difftool . Get rid of the prompt typing git config --global difftool.
In answer to the original question, git diff isn't showing anything because you have a brand new directory, with a newly added file, but there are zero changes in the file for git diff to show. git status is showing that you added a new file, but git diff is for showing changes within files.
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 withgit-logand friends.
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