Improved the simple indent delim method

autoload/vimtex/delim.vim

@@ -158,19 +158,6 @@ function! vimtex#delim#init_script() " {{{1
         \   . '\)\|\\\%(left\|right\)\s*\.',
         \}
 
-  let s:re.delim_mathmod = {
-        \ 'open' : '\%(\%(' . s:re.delim_mods.open . '\)\s*\)\%('
-        \   . join(map(copy(s:delims.delim_math.re), 'v:val[0]'), '\|')
-        \   . '\)\|\\left\s*\.',
-        \ 'close' : '\%(\%(' . s:re.delim_mods.close . '\)\s*\)\%('
-        \   . join(map(copy(s:delims.delim_math.re), 'v:val[1]'), '\|')
-        \   . '\)\|\\right\s*\.',
-        \ 'both' : '\%(\%(' . s:re.delim_mods.both . '\)\s*\)\%('
-        \   . join(map(copy(s:delims.delim_math.re), 'v:val[0]'), '\|') . '\|'
-        \   . join(map(copy(s:delims.delim_math.re), 'v:val[1]'), '\|')
-        \   . '\)\|\\\%(left\|right\)\s*\.',
-        \}
-
   let s:delims.env_all = {}
   let s:delims.delim_all = {}
   let s:delims.all = {}
@@ -229,8 +216,7 @@ endfunction
 function! vimtex#delim#get_delim_regexes(...) " {{{1
   return exists('s:re')
         \ ? [s:re.delim_math.open, s:re.delim_math.close,
-        \    s:re.delim_tex.open,  s:re.delim_tex.close,
+        \    s:re.delim_tex.open,  s:re.delim_tex.close]
-        \    s:re.delim_mathmod.open, s:re.delim_mathmod.close]
         \ : []
 endfunction
 

indent/tex.vim

@@ -115,12 +115,43 @@ let s:envs_enditem = s:envs_item . '\|' . s:envs_endlist
 function! s:indent_delims_simple(line, lnum, prev_line, prev_lnum) " {{{1
   if empty(s:re_delims) | return 0 | endif
 
-  return &sw*(  max([  s:count(a:prev_line, s:re_delims[4])
+  return &sw*(  max([  s:count(a:prev_line, s:re_open)
-        \            - s:count(a:prev_line, s:re_delims[5]), 0])
+        \            - s:count(a:prev_line, s:re_close), 0])
-        \     - max([  s:count(a:line, s:re_delims[5])
+        \     - max([  s:count(a:line, s:re_close)
-        \            - s:count(a:line, s:re_delims[4]), 0]))
+        \            - s:count(a:line, s:re_open), 0]))
 endfunction
 
+let s:delims_open = [
+      \ '\(',
+      \ '\[',
+      \ '\\\{',
+      \ '\\langle',
+      \ '\\lvert',
+      \ '\\lfloor',
+      \ '\\lceil',
+      \ '\\ulcorner',
+      \]
+let s:delims_close = [
+      \ '\)',
+      \ '\]',
+      \ '\\\}',
+      \ '\\rangle',
+      \ '\\rvert',
+      \ '\\rfloor',
+      \ '\\rceil',
+      \ '\\urcorner',
+      \]
+let s:re_open = '\v'
+      \ . '%(\\left|\\[bB]igg?l?)\s*%(' . join(s:delims_open, '|') . ')'
+      \ . '|\\left\s*\.'
+      \ . '|\{'
+      \ . '|\\\['
+let s:re_close = '\v'
+      \ . '%(\\right|\\[bB]igg?r?)\s*%(' . join(s:delims_close, '|') . ')'
+      \ . '|\\right\s*\.'
+      \ . '|\}'
+      \ . '|\\\]'
+
 " }}}1
 function! s:indent_delims_complex(line, lnum, prev_line, prev_lnum) " {{{1
   if empty(s:re_delims) | return 0 | endif