Added filename completer for standalone files

* Added filename completer for standalone files

* added the tikz file

autoload/vimtex/complete.vim

@@ -17,7 +17,7 @@ endfunction
 function! vimtex#complete#init_script() " {{{1
   if !g:vimtex_complete_enabled | return | endif
 
-  let s:completers = [s:bib, s:ref, s:img, s:inc, s:pdf, s:gls]
+  let s:completers = [s:bib, s:ref, s:img, s:inc, s:pdf, s:sta, s:gls]
 endfunction
 
 " }}}1
@@ -414,6 +414,27 @@ function! s:pdf.complete(regex) dict " {{{2
   return self.candidates
 endfunction
 
+" }}}1
+" {{{1 Filenames (\includestandalone)
+
+let s:sta = {
+      \ 'patterns' : ['\v\\includestandalone%(\s*\[[^]]*\])?\s*\{[^}]*$'],
+      \ 'enabled' : 1,
+      \}
+
+function! s:sta.complete(regex) dict " {{{2
+  let self.candidates = substitute(globpath(b:vimtex.root, '**/*.tex'), '\.tex', '', 'g')
+  let self.candidates = split(self.candidates, '\n')
+  let self.candidates = map(self.candidates,
+        \ 'strpart(v:val, len(b:vimtex.root)+1)')
+  let self.candidates = map(self.candidates, '{
+        \ ''word'' : v:val,
+        \ ''abbr'' : v:val,
+        \ ''menu'' : '' [includestandalone]'',
+        \}')
+  return self.candidates
+endfunction
+
 " }}}1
 " {{{1 Glossary
 

test/features/completions/main.tex

@@ -3,6 +3,7 @@
 \usepackage{cleveref}
 \usepackage{graphicx}
 \usepackage{pdfpages}
+\usepackage{standalone}
 
 \usepackage[backend=biber,style=authoryear]{biblatex}
 \addbibresource{biblatex-examples.bib}

test/features/completions/tikz_pic.tex

@@ -0,0 +1,10 @@
+\documentclass{standalone}
+\usepackage{standalone}
+\usepackage{tikz}
+\begin{document}
+\begin{tikzpicture}
+    \draw ((0, 0) node[below left]{\large Reliability} --
+        (0: 4) node[below right]{\large Acquisition costs} --
+        (60: 4) node[above]{\large Energy consumption} -- cycle;
+\end{tikzpicture}
+\end{document}