fix latex setup

lua/config/mappings.lua

@@ -22,9 +22,22 @@ m.nmap("[d", vim.diagnostic.goto_prev)
 m.nmap("]d", vim.diagnostic.goto_next)
 m.nmap("<leader>q", vim.diagnostic.setloclist)
 
--- easier <C-6>
+-- "alt tab"
 m.nmap("<leader>n", "<C-6>")
 
+-- open zathura for current tex
+-- I want to make this more generic
+-- however,,,,,, I hate regex
+-- and lua contains no path utils :)
+m.nmap("<leader>ot", function ()
+    local path = vim.api.nvim_buf_get_name(0)
+    io.popen("zathura "
+        ..path:match("(.*).tex")
+        ..".pdf"
+    )
+end)
+
+-- TODO: refactor so map() uses a layout file and converts
 -- colemak-dh
 local l = u.layout
 l.swap("n", "h")