From 750ad1884586628c5aa7fca7a23411035ce26a42 Mon Sep 17 00:00:00 2001
From: Jan Edmund Lazo <jan.lazo@mail.utoronto.ca>
Date: Sat, 26 Jun 2021 10:50:17 -0400
Subject: [PATCH] vim-patch:8.2.3050: cannot recognize elixir files

Problem:    Cannot recognize elixir files.
Solution:   Recognize Elixir-specific files.  Check if an .ex file is Euphoria
            or Elixir. (Austin Gatlin, closes vim/vim#8401, closes vim/vim#8446)
https://github.com/vim/vim/commit/f3caeb63d62c08b579e9b5f40b35e8bf64dde87a
---
 runtime/autoload/dist/ft.vim       | 11 +++++++++
 runtime/filetype.vim               | 11 +++++++--
 src/nvim/testdir/test_filetype.vim | 38 ++++++++++++++++++++++++++++++
 3 files changed, 58 insertions(+), 2 deletions(-)

diff --git a/runtime/autoload/dist/ft.vim b/runtime/autoload/dist/ft.vim
index 1ac74b5785..ac80659113 100644
--- a/runtime/autoload/dist/ft.vim
+++ b/runtime/autoload/dist/ft.vim
@@ -172,6 +172,17 @@ func dist#ft#FTent()
   setf dtd
 endfunc
 
+func dist#ft#ExCheck()
+  let lines = getline(1, min([line("$"), 100]))
+  if exists('g:filetype_euphoria')
+    exe 'setf ' . g:filetype_euphoria
+  elseif match(lines, '^--\|^ifdef\>\|^include\>') > -1
+    setf euphoria3
+  else
+    setf elixir
+  endif
+endfunc
+
 func dist#ft#EuphoriaCheck()
   if exists('g:filetype_euphoria')
     exe 'setf ' . g:filetype_euphoria
diff --git a/runtime/filetype.vim b/runtime/filetype.vim
index 09a1d1d0e6..d449edfd02 100644
--- a/runtime/filetype.vim
+++ b/runtime/filetype.vim
@@ -389,7 +389,7 @@ au BufNewFile,BufRead *.cfm,*.cfi,*.cfc		setf cf
 " Configure scripts
 au BufNewFile,BufRead configure.in,configure.ac setf config
 
-" CUDA  Cumpute Unified Device Architecture
+" CUDA Compute Unified Device Architecture
 au BufNewFile,BufRead *.cu,*.cuh		setf cuda
 
 " Dockerfilb; Podman uses the same syntax with name Containerfile
@@ -404,8 +404,15 @@ au BufNewFile,BufRead *enlightenment/*.cfg	setf c
 " Eterm
 au BufNewFile,BufRead *Eterm/*.cfg		setf eterm
 
+" Elixir or Euphoria
+au BufNewFile,BufRead *.ex call dist#ft#ExCheck()
+
+" Elixir
+au BufRead,BufNewFile mix.lock,*.exs setf elixir
+au BufRead,BufNewFile *.eex,*.leex setf eelixir
+
 " Euphoria 3 or 4
-au BufNewFile,BufRead *.eu,*.ew,*.ex,*.exu,*.exw  call dist#ft#EuphoriaCheck()
+au BufNewFile,BufRead *.eu,*.ew,*.exu,*.exw  call dist#ft#EuphoriaCheck()
 if has("fname_case")
    au BufNewFile,BufRead *.EU,*.EW,*.EX,*.EXU,*.EXW  call dist#ft#EuphoriaCheck()
 endif
diff --git a/src/nvim/testdir/test_filetype.vim b/src/nvim/testdir/test_filetype.vim
index 71a7a2cce5..202177053a 100644
--- a/src/nvim/testdir/test_filetype.vim
+++ b/src/nvim/testdir/test_filetype.vim
@@ -161,6 +161,8 @@ let s:filename_checks = {
     \ 'ecd': ['file.ecd'],
     \ 'edif': ['file.edf', 'file.edif', 'file.edo'],
     \ 'elinks': ['elinks.conf'],
+    \ 'elixir': ['file.ex', 'file.exs', 'mix.lock'],
+    \ 'eelixir': ['file.eex', 'file.leex'],
     \ 'elm': ['file.elm'],
     \ 'elmfilt': ['filter-rules'],
     \ 'epuppet': ['file.epp'],
@@ -765,5 +767,41 @@ func Test_pp_file()
   filetype off
 endfunc
 
+func Test_ex_file()
+  filetype on
+
+  call writefile(['arbitrary content'], 'Xfile.ex')
+  split Xfile.ex
+  call assert_equal('elixir', &filetype)
+  bwipe!
+  let g:filetype_euphoria = 'euphoria4'
+  split Xfile.ex
+  call assert_equal('euphoria4', &filetype)
+  bwipe!
+  unlet g:filetype_euphoria
+
+  call writefile(['-- filetype euphoria comment'], 'Xfile.ex')
+  split Xfile.ex
+  call assert_equal('euphoria3', &filetype)
+  bwipe!
+
+  call writefile(['--filetype euphoria comment'], 'Xfile.ex')
+  split Xfile.ex
+  call assert_equal('euphoria3', &filetype)
+  bwipe!
+
+  call writefile(['ifdef '], 'Xfile.ex')
+  split Xfile.ex
+  call assert_equal('euphoria3', &filetype)
+  bwipe!
+
+  call writefile(['include '], 'Xfile.ex')
+  split Xfile.ex
+  call assert_equal('euphoria3', &filetype)
+  bwipe!
+
+  call delete('Xfile.ex')
+  filetype off
+endfunc
 
 " vim: shiftwidth=2 sts=2 expandtab