kakoune/rc/base/haskell.kak
Francesco Mazzoli fa61d7aac0 fix regression in highlighting of qualified Haskell variables
Commit 870d2d22d7 introduced a regression
in the highlighting of qualified Haskell variables, such as `Foo.bar`.
After that commit `Fo` was highlighted as a constructor (note, not
`Foo`, just `Fo` without the trailing `o`). This restores the original
behavior.
2017-12-10 21:04:03 +01:00

112 lines
5.0 KiB
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# http://haskell.org
# ‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾
# Detection
# ‾‾‾‾‾‾‾‾‾
hook global BufCreate .*[.](hs) %{
set-option buffer filetype haskell
}
# Highlighters
# ‾‾‾‾‾‾‾‾‾‾‾‾
add-highlighter shared/ regions -default code haskell \
string '(?<!\'\\)(?<!\')"' (?<!\\)(\\\\)*" '' \
macro ^\h*?\K# (?<!\\)\n '' \
pragma \{-# '#-\}' \{- \
comment \{- -\} \{- \
comment --(?:[^!#$%&*+./<>?@\\\^|~=]|$) $ ''
add-highlighter shared/haskell/string fill string
add-highlighter shared/haskell/comment fill comment
add-highlighter shared/haskell/pragma fill meta
add-highlighter shared/haskell/macro fill meta
add-highlighter shared/haskell/code regex (?<!')\b0x+[A-Fa-f0-9]+ 0:value
add-highlighter shared/haskell/code regex (?<!')\b\d+([.]\d+)? 0:value
add-highlighter shared/haskell/code regex (?<!')\b(import|hiding|qualified|module)(?!')\b 0:keyword
add-highlighter shared/haskell/code regex (?<!')\b(import)(?!')\b[^\n]+(?<!')\b(as)(?!')\b 2:keyword
add-highlighter shared/haskell/code regex (?<!')\b(class|data|default|deriving|infix|infixl|infixr|instance|module|newtype|pattern|type|where)(?!')\b 0:keyword
add-highlighter shared/haskell/code regex (?<!')\b(case|do|else|if|in|let|mdo|of|proc|rec|then)(?!')\b 0:attribute
# The complications below is because period has many uses:
# As function composition operator (possibly without spaces) like "." and "f.g"
# Hierarchical modules like "Data.Maybe"
# Qualified imports like "Data.Maybe.Just", "Data.Maybe.maybe", "Control.Applicative.<$>"
# Quantifier separator in "forall a . [a] -> [a]"
# Enum comprehensions like "[1..]" and "[a..b]" (making ".." and "Module..." illegal)
# matches uppercase identifiers: Monad Control.Monad
# not non-space separated dot: Just.const
add-highlighter shared/haskell/code regex \b([A-Z]['\w]*\.)*[A-Z]['\w]*(?!['\w])(?![.\l]) 0:variable
# matches infix identifier: `mod` `Apa._T'M`
add-highlighter shared/haskell/code regex `\b([A-Z]['\w]*\.)*[\w]['\w]*` 0:operator
# matches imported operators: M.! M.. Control.Monad.>>
# not operator keywords: M... M.->
add-highlighter shared/haskell/code regex \b[A-Z]['\w]*\.[~<=>|:!?/.@$*&#%+\^\-\\]+ 0:operator
# matches dot: .
# not possibly incomplete import: a.
# not other operators: !. .!
add-highlighter shared/haskell/code regex (?<![\w~<=>|:!?/.@$*&#%+\^\-\\])\.(?![~<=>|:!?/.@$*&#%+\^\-\\]) 0:operator
# matches other operators: ... > < <= ^ <*> <$> etc
# not dot: .
# not operator keywords: @ .. -> :: ~
add-highlighter shared/haskell/code regex (?<![~<=>|:!?/.@$*&#%+\^\-\\])[~<=>|:!?/.@$*&#%+\^\-\\]+ 0:operator
# matches operator keywords: @ ->
add-highlighter shared/haskell/code regex (?<![~<=>|:!?/.@$*&#%+\^\-\\])(@|~|<-|->|=>|::|=|:|[|])(?![~<=>|:!?/.@$*&#%+\^\-\\]) 1:keyword
# matches: forall [..variables..] .
# not the variables
add-highlighter shared/haskell/code regex \b(forall)\b[^.\n]*?(\.) 1:keyword 2:keyword
# matches 'x' '\\' '\'' '\n' '\0'
# not incomplete literals: '\'
# not valid identifiers: w' _'
add-highlighter shared/haskell/code regex \B'([^\\]|[\\]['"\w\d\\])' 0:string
# this has to come after operators so '-' etc is correct
# Commands
# ‾‾‾‾‾‾‾‾
# http://en.wikibooks.org/wiki/Haskell/Indentation
define-command -hidden haskell-filter-around-selections %{
# remove trailing white spaces
try %{ execute-keys -draft -itersel <a-x> s \h+$ <ret> d }
}
define-command -hidden haskell-indent-on-new-line %{
evaluate-commands -draft -itersel %{
# copy -- comments prefix and following white spaces
try %{ execute-keys -draft k <a-x> s ^\h*\K--\h* <ret> y gh j P }
# preserve previous line indent
try %{ execute-keys -draft \; K <a-&> }
# align to first clause
try %{ execute-keys -draft \; k x X s ^\h*(if|then|else)?\h*(([\w']+\h+)+=)?\h*(case\h+[\w']+\h+of|do|let|where)\h+\K.* <ret> s \A|.\z <ret> & }
# filter previous line
try %{ execute-keys -draft k : haskell-filter-around-selections <ret> }
# indent after lines beginning with condition or ending with expression or =(
try %{ execute-keys -draft \; 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 window ref haskell }
hook global WinSetOption filetype=haskell %{
set-option window extra_word_chars "'"
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 window/haskell }
hook global WinSetOption filetype=(?!haskell).* %{
remove-hooks window haskell-indent
remove-hooks window haskell-hooks
}