kakoune/rc/base/haskell.kak
2016-10-01 14:09:59 +01:00

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# http://haskell.org
# ‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾
# Detection
# ‾‾‾‾‾‾‾‾‾
hook global BufSetOption mimetype=text/x-haskell %{
set buffer filetype haskell
}
hook global BufCreate .*[.](hs) %{
set buffer filetype haskell
}
# Highlighters
# ‾‾‾‾‾‾‾‾‾‾‾‾
addhl -group / regions -default code haskell \
string '"' (?<!\\)(\\\\)*" '' \
comment (--) $ '' \
comment \{- -\} \{- \
macro ^\h*?\K# (?<!\\)\n ''
addhl -group /haskell/string fill string
addhl -group /haskell/comment fill comment
addhl -group /haskell/macro fill meta
addhl -group /haskell/code regex \b(import)\b 0:meta
addhl -group /haskell/code regex \b(True|False)\b 0:value
addhl -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
addhl -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 %{
# 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> }
# copy -- comments prefix and following white spaces
try %{ exec -draft k x s ^\h*\K--\h* <ret> y j p }
# 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 %{ addhl 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).* %{ rmhl haskell }
hook global WinSetOption filetype=(?!haskell).* %{
rmhooks window haskell-indent
rmhooks window haskell-hooks
}