If git is performing a 3-way merge and has a conflict it can't resolve, it marks up that area of the file like this:

No unresolvable conflicts here
<<<<<<< HEAD
||||||| parent of ...
>>>>>>> ...

Is there a way (and, if so, how) to change the background color of these 3 "sections":

  • <<<<<<< HEAD through the line before ||||||| parent of ...
  • ||||||| parent of ... through the line before =======
  • The line after ======= through the line >>>>>>> ...

(EDIT: The question revolves around if there's a way to highlight certain lines depending on other lines. xyz would ordinarily not be highlighted, but since it's between <<<<<<< and ||||||| it would be highlighted.)

With also being able to handle other sets of conflict markers?

Using the most recent version of vim available at the time of a comment. So, as of now, 8.1.1183.

I use a black background and 256 colors in my terminal. I was thinking it would be nice to give these sections using the darkest R/G/B/C/M/Y colors, so they didn't cause much of a problem with syntax highlighting. (Talking about ANSI colors 52, 22, 17, 23, 53, and 58 - not the 1-6 colors.)

  • A simple google search query would have sufficed: github.com/rhysd/conflict-marker.vim – klaus Apr 18 at 2:48
  • @klaus, I should have mentioned I looked at that plugin while doing a lot of google searching. That plugin highlights the conflict markers themselves. It doesn't also highlight the text those markers are associated with, on other lines. I think the big issue at hand is if there's a way to highlight certain lines depending on other lines. Meaning, in my example, xyz would ordinarily not be highlighted, but since it's between <<<<<<< and ||||||| I would like it highlighted. – user1902689 Apr 18 at 19:57

In your Vim config, you can do the following (change the colors and styling to your liking):

function! ConflictsHighlight() abort
    syn region conflictStart start=/^<<<<<<< .*$/ end=/^\ze\(=======$\||||||||\)/
    syn region conflictMiddle start=/^||||||| .*$/ end=/^\ze=======$/
    syn region conflictEnd start=/^\(=======$\||||||| |\)/ end=/^>>>>>>> .*$/

    highlight conflictStart ctermbg=red ctermfg=black
    highlight conflictMiddle ctermbg=blue ctermfg=black
    highlight conflictEnd ctermbg=green cterm=bold ctermfg=black

augroup MyColors
    autocmd BufEnter * call ConflictsHighlight()
augroup END

Which renders as follow:

enter image description here

Is it what you are after?

  • That's absolutely what I'm after. I'm having some oddities with the vimscript though. If I type your example in, it looks just like the image you posted. If I save your example then restart vim editing the new file, it gets horribly out of whack. (vim 8.1.1186.) Even weirder, if I then delete all lines in an existing file showing weirdly, and re-paste its content, it's still showing wrong. i.ibb.co/jvGMH6t/wtfvim.jpg – user1902689 May 9 at 3:39
  • Using it in an actual merge scenario triggers an even weirder coloring than the image I linked, with: conflictStart being properly highlighted; the ||||||| part of conflictMiddle in red but the rest of the line in blue as it should be; the ======= in red; the >>>>>>> .* line in yellow (where did yellow come into this, there is no yellow); and the rest of the file which shouldn't be part of the conflict at all in green, still being picked up as conflictEnd according to the SynStack() function from stackoverflow.com/questions/30247603 – user1902689 May 9 at 3:49
  • Likewise, using the actual merge scenario, if I copy/paste the contents to a new file, it is displayed as expected, but as soon as it's saved and vim is restarted, it displays wrong. – user1902689 May 9 at 3:50
  • In an actual merge scenario, you can disable the original diff coloration using :diffoff, leaving only the filetype's syntax highlight. I will play a bit to see for your first case. – padawin May 9 at 7:45
  • Ack, sorry, had forgotten I had left the conflict_marker plugin installed after trying it before my post, which was conflicting and causing the problem. Removing that and no longer having that problem. – user1902689 May 9 at 7:47

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