use direnv export json for multiline env vars

lua/direnv.lua

@@ -224,13 +224,24 @@ M._init = function(path)
       end
 
       vim.schedule(function()
-         local env_commands = vim.split(obj.stdout, "\n")
+         local ok, env = pcall(vim.json.decode, obj.stdout)
-         if #env_commands > 0 then
+
-            for _, cmd in ipairs(env_commands) do
+         if not ok or type(env) ~= "table" then
-               if cmd ~= "" then
+            notify(
-                  pcall(function()
+               "Failed to parse direnv JSON output",
-                     vim.cmd(cmd)
+               vim.log.levels.ERROR
-                  end)
+            )
+            return
+         end
+
+         for key, value in pairs(env) do
+            if value == vim.NIL or value == nil then
+               vim.env[key] = nil
+            else
+               if type(value) ~= "string" then
+                  value = tostring(value)
+               end
+               vim.env[key] = value
             end
          end
 
@@ -244,12 +255,11 @@ M._init = function(path)
             "User",
             { pattern = "DirenvLoaded", modeline = false }
          )
-         end
       end)
    end
 
    vim.system(
-      { M.config.bin, "export", "vim" },
+      { M.config.bin, "export", "json" },
       { text = true, cwd = cwd },
       on_exit
    )