Fix interdiff output when using --color=always

[twaugh]

No description provided.

[codecov]

Codecov Report

❌ Patch coverage is 92.85714% with 3 lines in your changes missing coverage. Please review.
✅ Project coverage is 82.71%. Comparing base (861f372) to head (d30408f).
⚠️ Report is 10 commits behind head on master.

Files with missing lines	Patch %	Lines
src/interdiff.c	92.85%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #123      +/-   ##
==========================================
+ Coverage   82.62%   82.71%   +0.09%     
==========================================
  Files           5        5              
  Lines        4139     4155      +16     
  Branches      985      984       -1     
==========================================
+ Hits         3420     3437      +17     
+ Misses        719      718       -1     

Flag	Coverage Δ
unittests	82.71% <92.85%> (+0.09%)	⬆️

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[kerneltoast]

I think the extra allocations aren't necessary. What about making a variadic function called something like print_color() and having it handle the color escape codes? Or, since stdout is line-buffered when pointing to a terminal, you could print the color escape codes with an extra puts() before and after. Thoughts?

[twaugh]

You're right, that's much better, thanks!

[kerneltoast]

@twaugh This comment was resolved but the extra code block wasn't removed: https://github.com/twaugh/patchutils/pull/123/files#r2350304053

Other than that, looks great!

EDIT: Did it in PR #127