vim-patch:9.0.1539: typst filetype is not recognized (#23578)

Problem:    Typst filetype is not recognized.
Solution:   Distinguish between sql and typst. (Gaetan Lepage, closes vim/vim#12363)

https://github.com/vim/vim/commit/4ce1bda869e4ec0152d7dcbe1e491ceac5341d5e

2 files changed, 25 insertions, 1 deletions

diff --git a/runtime/lua/vim/filetype.lua b/runtime/lua/vim/filetype.lua
index 5c799b23f2..c746eef1bb 100644
--- a/runtime/lua/vim/filetype.lua
+++ b/runtime/lua/vim/filetype.lua
@@ -997,7 +997,9 @@ local extension = {
   spi = 'spyce',
   spy = 'spyce',
   tyc = 'sql',
-  typ = 'sql',
+  typ = function(path, bufnr)
+    return require('vim.filetype.detect').typ(bufnr)
+  end,
   pkb = 'sql',
   tyb = 'sql',
   pks = 'sql',
diff --git a/runtime/lua/vim/filetype/detect.lua b/runtime/lua/vim/filetype/detect.lua
index 74b01d569c..94106a3547 100644
--- a/runtime/lua/vim/filetype/detect.lua
+++ b/runtime/lua/vim/filetype/detect.lua
@@ -1322,6 +1322,28 @@ function M.txt(bufnr)
   end
 end
 
+function M.typ(bufnr)
+  if vim.g.filetype_typ then
+    return vim.g.filetype_typ
+  end
+
+  for _, line in ipairs(getlines(bufnr, 1, 200)) do
+    if
+      findany(line, {
+        '^CASE[%s]?=[%s]?SAME$',
+        '^CASE[%s]?=[%s]?LOWER$',
+        '^CASE[%s]?=[%s]?UPPER$',
+        '^CASE[%s]?=[%s]?OPPOSITE$',
+        '^TYPE%s',
+      })
+    then
+      return 'sql'
+    end
+  end
+
+  return 'typst'
+end
+
 -- Determine if a .v file is Verilog, V, or Coq
 function M.v(bufnr)
   if vim.fn.did_filetype() ~= 0 then