Just support latexsuite for now

Signed-off-by: Sebastian Ramacher <sebastian+dev@ramacher.at>

data/tex_zathurasynctex.vim

 " See LICENSE file for license and copyright information
 
+" This is a sample plugin that can be used for synctex forward synchronization.
+" It currently uses latexsuite to obtain the file name of the document. If you
+" are not using latexsuite, it should be enough to adopt output accordingly.
+
 " avoid re-execution
-if exists("b:did_zathura_synctex_plugin")
+if exists("b:did_zathura_synctex_plugin") || !exists("*Tex_GetMainFileName")
   finish
 endif
 let b:did_zathura_synctex_plugin = 1
 
-" set up global variables
-if !exists("g:zathura_synctex_latex_suite")
-  let g:zathura_synctex_latex_suite = 1
-endif
-
 function! Zathura_SyncTexForward()
   let source = expand("%:p")
   let input = shellescape(line(".").":".col(".").":".source)
-  let output = "<none>"
-  if exists("*Tex_GetMainFileName") && g:zathura_synctex_latex_suite == 1
-    " use Tex_GetMainFileName from latex-suite if it is available
-    let output = Tex_GetMainFileName(":p:r").".pdf"
-  else
-    " try to find synctex files and use them to determine the output file
-    let synctex_files = split(glob("%:p:h/*.synctex.gz"), "\n")
-    if len(synctex_files) == 0
-      echo "No synctex file found"
-      return
-    endif
-
-    let found = 0
-    for synctex in synctex_files
-      let pdffile = substitute(synctex, "synctex.gz", "pdf", "")
-      let out = system("synctex view -i ".input." -o ".shellescape(pdffile))
-      if match(out, "No tag for ".source) >= 0
-        continue
-      endif
-
-      let found = 1
-      let output = pdffile
-      break
-    endfor
-
-    if found == 0
-      echo "No synctex file containing reference to source file found"
-      return
-    endif
-  endif
-
+  let output = Tex_GetMainFileName(":p:r").".pdf"
   let execstr = "zathura --synctex-forward=".input." ".shellescape(output)
   silent call system(execstr)
 endfunction