vim-patch:8.2.4238: *.tf file could be fileytpe "tf" or "terraform"

Problem:    *.tf file could be fileytpe "tf" or "terraform".
Solution:   Detect the type from the file contents. (closes vim/vim#9642)
https://github.com/vim/vim/commit/bd8168c7705e315827642f2976ec59e26b7fe009

4 files changed, 40 insertions, 4 deletions

diff --git a/runtime/autoload/dist/ft.vim b/runtime/autoload/dist/ft.vim
index 69712046a5..86c71fa52d 100644
--- a/runtime/autoload/dist/ft.vim
+++ b/runtime/autoload/dist/ft.vim
@@ -862,6 +862,21 @@ func dist#ft#FTfoam()
     endwhile
 endfunc
 
+" Determine if a *.tf file is TF mud client or terraform
+func dist#ft#FTtf()
+  let numberOfLines = line('$')
+  for i in range(1, numberOfLines)
+    let currentLine = trim(getline(i))
+    let firstCharacter = currentLine[0]
+    if firstCharacter !=? ";" && firstCharacter !=? "/" && firstCharacter !=? ""
+      setf terraform
+      return
+    endif
+  endfor
+  setf tf
+endfunc
+
+
 " Restore 'cpoptions'
 let &cpo = s:cpo_save
 unlet s:cpo_save
diff --git a/runtime/filetype.vim b/runtime/filetype.vim
index 2a0a5110f2..6a27998cf4 100644
--- a/runtime/filetype.vim
+++ b/runtime/filetype.vim
@@ -1942,10 +1942,13 @@ au BufNewFile,BufRead texmf.cnf			setf texmf
 au BufNewFile,BufRead .tidyrc,tidyrc,tidy.conf	setf tidy
 
 " TF mud client
-au BufNewFile,BufRead *.tf,.tfrc,tfrc		setf tf
+au BufNewFile,BufRead .tfrc,tfrc		setf tf
+
+" TF mud client or terraform
+au BufNewFile,BufRead *.tf			call dist#ft#FTtf()
 
 " TLA+
-au BufRead,BufNewFile *.tla			setf tla
+au BufNewFile,BufRead *.tla			setf tla
 
 " tmux configuration
 au BufNewFile,BufRead {.,}tmux*.conf		setf tmux
@@ -1954,7 +1957,7 @@ au BufNewFile,BufRead {.,}tmux*.conf		setf tmux
 au BufNewFile,BufRead *.toml			setf toml
 
 " TPP - Text Presentation Program
-au BufNewFile,BufReadPost *.tpp			setf tpp
+au BufNewFile,BufRead *.tpp			setf tpp
 
 " Treetop
 au BufRead,BufNewFile *.treetop			setf treetop
diff --git a/runtime/lua/vim/filetype.lua b/runtime/lua/vim/filetype.lua
index bd3b44e95b..7fa2fbe001 100644
--- a/runtime/lua/vim/filetype.lua
+++ b/runtime/lua/vim/filetype.lua
@@ -661,7 +661,6 @@ local extension = {
   txi = "texinfo",
   texinfo = "texinfo",
   text = "text",
-  tf = "tf",
   tfvars = "terraform",
   tla = "tla",
   tli = "tli",
@@ -827,6 +826,7 @@ local extension = {
   stm = function() vim.fn["dist#ft#FThtml"]() end,
   tcsh = function() vim.fn["dist#ft#SetFileTypeShell"]("tcsh") end,
   tex = function() vim.fn["dist#ft#FTtex"]() end,
+  tf = function() vim.fn["dist#ft#FTtf"]() end,
   w = function() vim.fn["dist#ft#FTprogress_cweb"]() end,
   xml = function() vim.fn["dist#ft#FTxml"]() end,
   y = function() vim.fn["dist#ft#FTy"]() end,
diff --git a/src/nvim/testdir/test_filetype.vim b/src/nvim/testdir/test_filetype.vim
index eb4824aa32..8d6f9ded1d 100644
--- a/src/nvim/testdir/test_filetype.vim
+++ b/src/nvim/testdir/test_filetype.vim
@@ -746,6 +746,24 @@ func Test_hook_file()
   filetype off
 endfunc
 
+func Test_tf_file()
+  filetype on
+
+  call writefile([';;; TF MUD client is super duper cool'], 'Xfile.tf')
+  split Xfile.tf
+  call assert_equal('tf', &filetype)
+  bwipe!
+
+  call writefile(['provider "azurerm" {'], 'Xfile.tf')
+  split Xfile.tf
+  call assert_equal('terraform', &filetype)
+  bwipe!
+
+  call delete('Xfile.tf')
+  filetype off
+endfunc
+
+
 func Test_ts_file()
   filetype on