🐛 git blame -C loses syntax highlighting

[rmacklin]

The -C flag for git blame is useful for tracking blame beyond code that was moved from one file to another. Unfortunately, it seems to cause delta to lose its syntax highlighting - the blame still has grouped background highlights in different shades of gray, but the code itself isn't highlighted. Here is an asciinema recording demonstrating the issue by running git blame src/handlers/blame.rs and git blame -C src/handlers/blame.rs in a clone of this repository (at commit a01141b):

[rmacklin]

Possibly related:

• 🐛 When using --date with git blame delta, the output is not colored #1278

[rmacklin]

Hmm, this just got even weirder. If I run git blame -C -w src/handlers/blame.rs it works with syntax highlighting. But...swapping the order of those flags to git blame -w -C src/handlers/blame.rs has no syntax highlighting. Perhaps the issue only occurs if -C is the last flag...? 🤔

[th1000s]

Nice find! The blame output does not mention the file type, so delta uses the git blame command line to find it. It seems -C is not handled correctly in all cases, see guess_git_blame_filename_extension(..) in src/utils/process.rs:117.