fix(nvim): simplify preview.nvim config

spec/synctex_zathura.lua

@@ -0,0 +1,37 @@
+vim.cmd([[set runtimepath=$VIMRUNTIME]])
+vim.opt.runtimepath:append('.')
+vim.opt.packpath = {}
+vim.opt.loadplugins = false
+
+require('preview.commands').setup()
+
+vim.fn.serverstart('/tmp/nvim-preview.sock')
+
+local synctex_pdf = {}
+vim.api.nvim_create_autocmd('User', {
+  pattern = 'PreviewCompileSuccess',
+  callback = function(args)
+    synctex_pdf[args.data.bufnr] = args.data.output
+  end,
+})
+
+vim.g.preview = {
+  latex = {
+    open = {
+      'zathura',
+      '--synctex-editor-command',
+      'nvim --server /tmp/nvim-preview.sock'
+        .. [[ --remote-expr "execute('b +%{line} %{input}')"]],
+    },
+  },
+}
+
+vim.keymap.set('n', '<leader>s', function()
+  local pdf = synctex_pdf[vim.api.nvim_get_current_buf()]
+  if pdf then
+    vim.fn.jobstart({
+      'zathura', '--synctex-forward',
+      vim.fn.line('.') .. ':0:' .. vim.fn.expand('%:p'), pdf,
+    })
+  end
+end)