There have been proposals to add more language aliases to markdown.kak
(#4592) and allow users to add their own aliases (#4489).
To recap: various markdown implementations allow specifying aliases
for languages. For example, here is a code block that should be
highlighted as filetype "haskell" but isn't:
```hs
-- highlight as haskell
```
There are lots of aliases out in the wild - "pygmentize -L" lists
some but I don't think there is a canonical list.
Today we have a hardcoded list of supported filetypes. This is hard
to mainta, extend, and it can impact performance.
This patch simply attempts to load the module "hs" and the shared
highlighter "hs". This means that users can use this (obvious?) snippet
to add their own aliases:
provide-module hs %{
require-module haskell
add-highlighter shared/hs ref haskell
}
Untrusted Markdown files can load arbitrary modules, but that was
already true before, and modules are assumed to be trusted anyway.
Since language highlighters are now loaded *after* the generic
code-block highlighter, we need to make sure the language highlighters
take precedence. Do this by making them sub-regions of the generic one.
Closes#4489
This improves performance on the [5MB Markdown
file](https://github.com/mawww/kakoune/issues/4685#issuecomment-1208129806).
$ HOME=$PWD hyperfine -w 1 'git checkout HEAD'{~,}' -- :/rc/filetype/markdown.kak && ./kak.opt big_markdown.md -e "hook global NormalIdle .* quit" -ui dummy'
Benchmark 1: git checkout HEAD~ -- :/rc/filetype/markdown.kak && ./kak.opt big_markdown.md -e "hook global NormalIdle .* quit" -ui dummy
Time (mean ± σ): 3.225 s ± 0.074 s [User: 3.199 s, System: 0.027 s]
Range (min … max): 3.099 s … 3.362 s 10 runs
Benchmark 2: git checkout HEAD -- :/rc/filetype/markdown.kak && ./kak.opt big_markdown.md -e "hook global NormalIdle .* quit" -ui dummy
Time (mean ± σ): 1.181 s ± 0.030 s [User: 1.162 s, System: 0.021 s]
Range (min … max): 1.149 s … 1.234 s 10 runs
Summary
'git checkout HEAD -- :/rc/filetype/markdown.kak && ./kak.opt big_markdown.md -e "hook global NormalIdle .* quit" -ui dummy' ran
2.73 ± 0.09 times faster than 'git checkout HEAD~ -- :/rc/filetype/markdown.kak && ./kak.opt big_markdown.md -e "hook global NormalIdle .* quit" -ui dummy'
(These numbers depend on another optimization.)
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