kakoune/rc/base/haskell.kak
2017-01-11 13:56:48 +00:00

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# http://haskell.org
# ‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾
# Detection
# ‾‾‾‾‾‾‾‾‾
hook global BufCreate .*[.](hs) %{
set buffer filetype haskell
}
# Highlighters
# ‾‾‾‾‾‾‾‾‾‾‾‾
add-highlighter -group / regions -default code haskell \
string '"' (?<!\\)(\\\\)*" '' \
comment (--) $ '' \
comment \{- -\} \{- \
macro ^\h*?\K# (?<!\\)\n ''
add-highlighter -group /haskell/string fill string
add-highlighter -group /haskell/comment fill comment
add-highlighter -group /haskell/macro fill meta
add-highlighter -group /haskell/code regex \b(import)\b 0:meta
add-highlighter -group /haskell/code regex \b(True|False)\b 0:value
add-highlighter -group /haskell/code regex \b(as|case|class|data|default|deriving|do|else|hiding|if|in|infix|infixl|infixr|instance|let|module|newtype|of|qualified|then|type|where)\b 0:keyword
add-highlighter -group /haskell/code regex \b(Int|Integer|Char|Bool|Float|Double|IO|Void|Addr|Array|String)\b 0:type
# Commands
# ‾‾‾‾‾‾‾‾
# http://en.wikibooks.org/wiki/Haskell/Indentation
def -hidden _haskell_filter_around_selections %{
# remove trailing white spaces
try %{ exec -draft -itersel <a-x> s \h+$ <ret> d }
}
def -hidden _haskell_indent_on_new_line %{
eval -draft -itersel %{
# copy -- comments prefix and following white spaces
try %{ exec -draft k x s ^\h*\K--\h* <ret> y gh j P }
# preserve previous line indent
try %{ exec -draft <space> K <a-&> }
# align to first clause
try %{ exec -draft <space> k x X s ^\h*(if|then|else)?\h*(([\w']+\h+)+=)?\h*(case\h+[\w']+\h+of|do|let|where)\h+\K.* <ret> s \`|.\' <ret> & }
# filter previous line
try %{ exec -draft k : _haskell_filter_around_selections <ret> }
# indent after lines beginning with condition or ending with expression or =(
try %{ exec -draft <space> k x <a-k> ^\h*(if)|(case\h+[\w']+\h+of|do|let|where|[=(])$ <ret> j <a-gt> }
}
}
# Initialization
# ‾‾‾‾‾‾‾‾‾‾‾‾‾‾
hook -group haskell-highlight global WinSetOption filetype=haskell %{ add-highlighter ref haskell }
hook global WinSetOption filetype=haskell %{
hook window InsertEnd .* -group haskell-hooks _haskell_filter_around_selections
hook window InsertChar \n -group haskell-indent _haskell_indent_on_new_line
}
hook -group haskell-highlight global WinSetOption filetype=(?!haskell).* %{ remove-highlighter haskell }
hook global WinSetOption filetype=(?!haskell).* %{
remove-hooks window haskell-indent
remove-hooks window haskell-hooks
}