From 599f5c6fa051a48ad82965be18237b350f63aa0a Mon Sep 17 00:00:00 2001
From: Josip Palavra <4420778+tyckesak@users.noreply.github.com>
Date: Wed, 16 Nov 2022 23:00:49 +0100
Subject: [PATCH 1/4] Fix TeX directive recognition
MIME-Version: 1.0
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This one simple typo—probably left over from some old version—rendered TeX directives like `%! TeX program = lualatex` useless and prevented Vimtex from recognising directives at all.
---
 autoload/vimtex/state/class.vim | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/autoload/vimtex/state/class.vim b/autoload/vimtex/state/class.vim
index d3bf107a04..88a6c9e6fc 100644
--- a/autoload/vimtex/state/class.vim
+++ b/autoload/vimtex/state/class.vim
@@ -130,7 +130,7 @@ function! s:vimtex.get_tex_program() abort dict " {{{1
   let l:tex_program_re =
         \ '\v^\c\s*\%\s*!?\s*tex\s+%(ts-)?program\s*\=\s*\zs.*\ze\s*$'
 
-  let l:lines = vimtex#parser#preamble(self.tex, {'root' : self.root})[:20]
+  let l:lines = vimtex#parser#preamble(self.base, {'root' : self.root})[:20]
   call map(l:lines, 'matchstr(v:val, l:tex_program_re)')
   call filter(l:lines, '!empty(v:val)')
   return tolower(get(l:lines, -1, '_'))

From 2cfefa6b6c950a18f6724b59ac041e85040d7852 Mon Sep 17 00:00:00 2001
From: tyckesak <4420778+tyckesak@users.noreply.github.com>
Date: Sat, 26 Nov 2022 18:05:05 +0100
Subject: [PATCH 2/4] =?UTF-8?q?Modify=20File=20Ending=20Recognition;=20rev?=
 =?UTF-8?q?ert=20=E2=80=9Cbugfix=E2=80=9D?=
MIME-Version: 1.0
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Turns out Vimtex did not recognise files ending in ‘.latex’ which
might be the preferred ending for some; neither for ‘.tex’
and ‘.tikz’ if cased differently
---
 autoload/vimtex/state/class.vim | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/autoload/vimtex/state/class.vim b/autoload/vimtex/state/class.vim
index 88a6c9e6fc..37981a4998 100644
--- a/autoload/vimtex/state/class.vim
+++ b/autoload/vimtex/state/class.vim
@@ -18,8 +18,10 @@ function! vimtex#state#class#new(main, main_parser, preserve_root) abort " {{{1
   endif
 
   let l:ext = fnamemodify(a:main, ':e')
-  let l:new.tex = index(['tex', 'dtx', 'tikz', 'ins'], l:ext) >= 0
-        \ ? a:main : ''
+  " Recognise (La)TeX-related file extensions
+  let l:new.tex = empty(filter(['^(la)?tex$', '^dtx$', '^tikz$'],
+                             \  'l:ext =~? v:val'))
+                \ ? a:main : ''
 
   " Get preamble for some state parsing
   let l:preamble = !empty(l:new.tex)
@@ -130,7 +132,7 @@ function! s:vimtex.get_tex_program() abort dict " {{{1
   let l:tex_program_re =
         \ '\v^\c\s*\%\s*!?\s*tex\s+%(ts-)?program\s*\=\s*\zs.*\ze\s*$'
 
-  let l:lines = vimtex#parser#preamble(self.base, {'root' : self.root})[:20]
+  let l:lines = vimtex#parser#preamble(self.tex, {'root' : self.root})[:20]
   call map(l:lines, 'matchstr(v:val, l:tex_program_re)')
   call filter(l:lines, '!empty(v:val)')
   return tolower(get(l:lines, -1, '_'))

From ac8c015d1ff52eca80d7eea79a859b818c0dd0be Mon Sep 17 00:00:00 2001
From: tyckesak <4420778+tyckesak@users.noreply.github.com>
Date: Sat, 26 Nov 2022 18:50:44 +0100
Subject: [PATCH 3/4] Typofix nasty Vimscript Regex behaviour

---
 autoload/vimtex/state/class.vim | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/autoload/vimtex/state/class.vim b/autoload/vimtex/state/class.vim
index 37981a4998..a9aa276735 100644
--- a/autoload/vimtex/state/class.vim
+++ b/autoload/vimtex/state/class.vim
@@ -19,9 +19,7 @@ function! vimtex#state#class#new(main, main_parser, preserve_root) abort " {{{1
 
   let l:ext = fnamemodify(a:main, ':e')
   " Recognise (La)TeX-related file extensions
-  let l:new.tex = empty(filter(['^(la)?tex$', '^dtx$', '^tikz$'],
-                             \  'l:ext =~? v:val'))
-                \ ? a:main : ''
+  let l:new.tex = l:ext =~? '^\(\(la\)\=tex\|dtx\|tikz\)$' ? a:main : ''
 
   " Get preamble for some state parsing
   let l:preamble = !empty(l:new.tex)

From 0529f763ee4361571f95dfbad0027d5a49e0855c Mon Sep 17 00:00:00 2001
From: tyckesak <4420778+tyckesak@users.noreply.github.com>
Date: Sun, 27 Nov 2022 17:39:44 +0100
Subject: [PATCH 4/4] Apply cosmetic changes for filetype recognition

Changes requested by higher power.
---
 autoload/vimtex/state/class.vim | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/autoload/vimtex/state/class.vim b/autoload/vimtex/state/class.vim
index a9aa276735..8a8cae727e 100644
--- a/autoload/vimtex/state/class.vim
+++ b/autoload/vimtex/state/class.vim
@@ -18,8 +18,7 @@ function! vimtex#state#class#new(main, main_parser, preserve_root) abort " {{{1
   endif
 
   let l:ext = fnamemodify(a:main, ':e')
-  " Recognise (La)TeX-related file extensions
-  let l:new.tex = l:ext =~? '^\(\(la\)\=tex\|dtx\|tikz\)$' ? a:main : ''
+  let l:new.tex = l:ext =~? '\v^%(%(la)?tex|dtx|tikz|ins)$' ? a:main : ''
 
   " Get preamble for some state parsing
   let l:preamble = !empty(l:new.tex)