fix: open correct pdf file when previewing from nvim

roles/nvim/files/lua/compileDoc.lua

@@ -3,14 +3,20 @@ local M = {}
 local pdf_viewer_pid = 0
 
 local compile = function(file)
-  vim.fn.jobstart({ "compiledoc", file }, {
+  return vim.fn.jobstart({ "compiledoc", file }, {
     on_exit = function() print("Finished compiling.") end
   })
 end
 
+local file_exists = function(name)
+   local f=io.open(name,"r")
+   if f~=nil then io.close(f) return true else return false end
+end
+
+
 M.open_document_preview = function()
   local filename = vim.api.nvim_buf_get_name(0)
-  compile(filename)
+  local compile_job = compile(filename)
 
   vim.api.nvim_create_augroup("compileDoc", {})
 
@@ -21,6 +27,17 @@ M.open_document_preview = function()
   })
 
   local pdf_filename = string.gsub(filename, "%..+$", ".pdf")
+
+  vim.fn.jobwait({compile_job})
+
+  if not file_exists(pdf_filename) then
+    local scan = require'plenary.scandir'
+    local build_dir = scan.scan_dir({ '.', '..' }, { depth = 1, add_dirs = true, search_pattern = 'build' })
+    local result = scan.scan_dir(build_dir[1], { depth = 3, search_pattern = ".*%.pdf" })
+
+    pdf_filename = result[1]
+  end
+
   pdf_viewer_pid = vim.fn.jobstart({ "zathura", pdf_filename })
 end