I have the following code and I want to define a syntax highlight rule that will show all lines as commented out starting at the line with ## till the indentation ends just before the last print line.

The indentation works like that in python.

function test a b
    arg Int a b
    ## if a>b
        show "Bigger"
        another command
    print "More stuff"

I think I should use something like the following, but how do I define the end condition based on indentation ? The start condition should somehow remember its indentation and the end condition should use that information. But how ?

syntax region myComment start=/\v##/ skip=/\v\\./ end=???

The comment highligthing should also stop when encountering a blank line.

function test a b
    arg Int a b
    ## if a>b
       show "Bigger"

function more a b
    arg Int a b

You can try following:

syntax region Comment start=/^\z(\s*\)##/ end=/^\z1\ze\S/

See :h /\z(\).

Basically it saves whitespace indentation in \z1 and use it in end of region just before first non-whitespace. Also see :h /\ze.

enter image description here

For Edited part of question

Make it also end on empty line

syntax region Comment start=/^\z(\s*\)##/ end=/\(^\z1\ze\S\)\|\(^\s*$\)/

by adding empty line regex to the end.

enter image description here

Bear in mind that it probably wouldn't work if you mix tabs and spaces.

  • Thanks. It does solve my original question, but not my entire problem. When the commented block is followed by a blank line instead of another command, the highlighting breaks for the rest of the file. I will edit my question to show this case as well. Jan 29 '20 at 18:08
  • @PaulSchutte check updates
    – Maxim Kim
    Jan 29 '20 at 18:36
  • I'm sure it would work with tabs+space, because \s matches both. But in general best to avoid them, sure
    – D. Ben Knoble
    Jan 29 '20 at 21:34
  • But the length would be different for \z part
    – Maxim Kim
    Jan 30 '20 at 3:32

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