patch 9.0.0012: signature files not detected properly
Problem: Signature files not detected properly.
Solution: Add a function to better detect signature files. (Doug Kearns)
diff --git a/runtime/autoload/dist/ft.vim b/runtime/autoload/dist/ft.vim
index 5f48f4b..a96bdf5 100644
--- a/runtime/autoload/dist/ft.vim
+++ b/runtime/autoload/dist/ft.vim
@@ -459,7 +459,7 @@
setf nroff
enddef
-# Returns true if file content looks like LambdaProlog
+# Returns true if file content looks like LambdaProlog module
def IsLProlog(): bool
# skip apparent comments and blank lines, what looks like
# LambdaProlog comment may be RAPID header
@@ -848,6 +848,27 @@
return 0
enddef
+# LambdaProlog and Standard ML signature files
+export def FTsig()
+ if exists("g:filetype_sig")
+ exe "setf " .. g:filetype_sig
+ return
+ endif
+
+ var lprolog_comment = '^\s*\%(/\*\|%\)'
+ var lprolog_keyword = '^\s*sig\s\+\a'
+ var sml_comment = '^\s*(\*'
+ var sml_keyword = '^\s*\%(signature\|structure\)\s\+\a'
+
+ var line = getline(nextnonblank(1))
+
+ if line =~ lprolog_comment || line =~# lprolog_keyword
+ setf lprolog
+ elseif line =~ sml_comment || line =~# sml_keyword
+ setf sml
+ endif
+enddef
+
export def FTsys()
if exists("g:filetype_sys")
exe "setf " .. g:filetype_sys