runtime(haskell): add include-search and define support in ftplugin

closes: #19143

Signed-off-by: Mateo Gjika <104777599+mateoxh@users.noreply.github.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>

diff --git a/runtime/ftplugin/haskell.vim b/runtime/ftplugin/haskell.vim
index dbb1156f714459d2f7c7a4756f7f480063484df2..5953e03dd734e4d03ca78f1d5fe7611dd01ac98f 100644 (file)
--- a/runtime/ftplugin/haskell.vim
+++ b/runtime/ftplugin/haskell.vim
@@ -4,6 +4,7 @@
 " Previous Maintainer:  Nikolai Weibull <now@bitwi.se>
 " Latest Revision:      2018-08-27
 " 2025 Jul 09 by Vim Project revert setting iskeyword #8191
+" 2026 Jan 18 by Vim Project add include-search and define support #19143
 
 if exists("b:did_ftplugin")
   finish
@@ -13,11 +14,19 @@ let b:did_ftplugin = 1
 let s:cpo_save = &cpo
 set cpo&vim
 
-let b:undo_ftplugin = "setl com< cms< fo<"
+let b:undo_ftplugin = "setl com< cms< fo< su< sua< inex< inc< def<"
 
 setlocal comments=s1fl:{-,mb:-,ex:-},:-- commentstring=--\ %s
 setlocal formatoptions-=t formatoptions+=croql
 setlocal omnifunc=haskellcomplete#Complete
 
+setlocal suffixes+=.hi
+setlocal suffixesadd=.hs,.lhs,.hsc
+
+setlocal includeexpr=findfile(tr(v:fname,'.','/'),'.;')
+setlocal include=^import\\>\\%(\\s\\+safe\\>\\)\\?\\%(\\s\\+qualified\\>\\)\\?
+
+setlocal define=^\\%(data\\>\\\|class\\>\\%(.*=>\\)\\?\\\|\\%(new\\)\\?type\\>\\\|\\ze\\k\\+\\s*\\%(::\\\|=\\)\\)
+
 let &cpo = s:cpo_save
 unlet s:cpo_save