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A Fix An existing pattern needs to be cleared to allow the new rule to match on any 2 trailing spaces: syntax clear markdownLineBreak syntax match markdownLineBreak '\s\{2}$' conceal cchar=⏎ ...
Answer
#1: Initial revision
by
rcmosher
·
2024-05-24T09:56:40Z (7 months ago)
### A Fix
An existing pattern needs to be cleared to allow the new rule to match on any 2 trailing spaces:
```vim
syntax clear markdownLineBreak
syntax match markdownLineBreak '\s\{2}$' conceal cchar=⏎
```
### Why it's not working
The syntax pattern only matches on exactly 2 trailing spaces because there is a standard pattern matching on 2 or more spaces for markdown. See /usr/share/vim/vim90/syntax/markdown.vim
```vim
syn match markdownLineBreak " \{2,\}$"
```
### Troubleshooting
I was able to determine the name of the problem match by using the `synIDattr()` function on trailing spaces where my match wasn't applied. The following will get the syntax group-name applied to the current position.
```vim
synIDattr(synID(line("."),col("."),1),"name")
```
### Utilizing the Existing Pattern
You could also take advantage of the current pattern with something like
```vim
hi markdownLineBreak gui=underline cterm=underline
```
From my understanding you can't add conceal to an existing pattern, but can replace it with `matchadd()`. [vi.stackexhange answer](https://vi.stackexchange.com/questions/5696/adding-conceal-to-already-existing-syntax-highlighting)