home/rc/base/markdown.kak

# http://daringfireball.net/projects/markdown
# ‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾

# Detection
# ‾‾‾‾‾‾‾‾‾

hook global BufCreate .*[.](markdown|md|mkd) %{
    set-option buffer filetype markdown
}

# Highlighters
# ‾‾‾‾‾‾‾‾‾‾‾‾

add-highlighter shared/markdown regions
add-highlighter shared/markdown/inline default-region regions
add-highlighter shared/markdown/inline/text default-region group

evaluate-commands %sh{
  languages="
    c cabal clojure coffee cpp css cucumber d diff dockerfile fish gas go
    haml haskell html ini java javascript json julia kak kickstart latex
    lisp lua makefile markdown moon objc perl pug python ragel ruby rust
    sass scala scss sh swift toml tupfile typescript yaml sql
  "
  for lang in ${languages}; do
    printf 'add-highlighter shared/markdown/%s region -match-capture ^(\h*)```\h*%s\\b   ^(\h*)``` regions\n' "${lang}" "${lang}"
    printf 'add-highlighter shared/markdown/%s/ default-region fill meta\n' "${lang}"
    [ "${lang}" = kak ] && ref=kakrc || ref="${lang}"
    printf 'add-highlighter shared/markdown/%s/inner region \A```[^\\n]*\K (?=```) ref %s\n' "${lang}" "${ref}"
  done
}

add-highlighter shared/markdown/codeblock region -match-capture \
    ^(\h*)```\h* \
    ^(\h*)```\h*$ \
    fill meta

add-highlighter shared/markdown/listblock region ^\h*[-*]\s ^\h*((?=[-*])|$) regions
add-highlighter shared/markdown/listblock/marker region \A [-*]\s fill bullet
add-highlighter shared/markdown/listblock/content default-region ref markdown/inline

add-highlighter shared/markdown/inline/code region -match-capture (`+) (`+) fill mono

# Setext-style header
add-highlighter shared/markdown/inline/text/ regex (\A|\n\n)[^\n]+\n={2,}\h*\n\h*$ 0:title
add-highlighter shared/markdown/inline/text/ regex (\A|\n\n)[^\n]+\n-{2,}\h*\n\h*$ 0:header

# Atx-style header
add-highlighter shared/markdown/inline/text/ regex ^#[^\n]* 0:header

add-highlighter shared/markdown/inline/text/ regex (?<!\*)(\*([^\s*]|([^\s*](\n?[^\n*])*[^\s*]))\*)(?!\*) 1:italic
add-highlighter shared/markdown/inline/text/ regex (?<!_)(_([^\s_]|([^\s_](\n?[^\n_])*[^\s_]))_)(?!_) 1:italic
add-highlighter shared/markdown/inline/text/ regex (?<!\*)(\*\*([^\s*]|([^\s*](\n?[^\n*])*[^\s*]))\*\*)(?!\*) 1:bold
add-highlighter shared/markdown/inline/text/ regex (?<!_)(__([^\s_]|([^\s_](\n?[^\n_])*[^\s_]))__)(?!_) 1:bold
add-highlighter shared/markdown/inline/text/ regex <(([a-z]+://.*?)|((mailto:)?[\w+-]+@[a-z]+[.][a-z]+))> 0:link
add-highlighter shared/markdown/inline/text/ regex ^\[[^\]\n]*\]:\h*([^\n]*) 1:link
add-highlighter shared/markdown/inline/text/ regex ^\h*(>\h*)+ 0:comment
add-highlighter shared/markdown/inline/text/ regex \H\K\h\h$ 0:PrimarySelection

# Commands
# ‾‾‾‾‾‾‾‾

define-command -hidden markdown-indent-on-new-line %{
    evaluate-commands -draft -itersel %{
        # copy block quote(s), list item prefix and following white spaces
        try %{ execute-keys -draft k <a-x> s ^\h*\K((>\h*)+([*+-]\h)?|(>\h*)*[*+-]\h)\h* <ret> y gh j P }
        # preserve previous line indent
        try %{ execute-keys -draft \; K <a-&> }
        # remove trailing white spaces
        try %{ execute-keys -draft -itersel %{ k<a-x> s \h+$ <ret> d } }
    }
}

# Initialization
# ‾‾‾‾‾‾‾‾‾‾‾‾‾‾

hook -group markdown-highlight global WinSetOption filetype=markdown %{
    add-highlighter window/markdown ref markdown
    hook -once -always window WinSetOption filetype=.* %{ remove-highlighter window/markdown }
}

hook global WinSetOption filetype=markdown %{
    hook window InsertChar \n -group markdown-indent markdown-indent-on-new-line
    hook -once -always window WinSetOption filetype=.* %{ remove-hooks window markdown-.+ }
}