feat: support default configs from external sources (#428)

Author: cseickel

lua/neo-tree/setup/init.lua

@@ -396,43 +396,47 @@ M.merge_config = function(user_config, is_auto_config)
 
   highlights.setup()
 
-  -- setup the default values for all sources
-  normalize_mappings(default_config)
-  normalize_mappings(user_config)
-  merge_renderers(default_config, nil, user_config)
-
   -- used to either limit the sources that or loaded, or add extra external sources
   local all_sources = {}
   local all_source_names = {}
   for _, source in ipairs(user_config.sources or default_config.sources) do
     local parts = utils.split(source, ".")
     local name = parts[#parts]
-    if #parts > 1 then
-      -- fully qualified module name
-      all_sources[name] = source
-    else
+    local is_internal_ns, is_external_ns = false, false
+    local module
+
+    if #parts == 1 then
       -- might be a module name in the internal namespace
-      local is_internal_ns, _ = pcall(require, "neo-tree.sources." .. source)
-      if is_internal_ns then
-        all_sources[name] = "neo-tree.sources." .. name
+      is_internal_ns, module = pcall(require, "neo-tree.sources." .. source)
+    end
+    if is_internal_ns then
+      name = module.name or name
+      all_sources[name] = "neo-tree.sources." .. name
+    else
+      -- fully qualified module name
+      -- or just a root level module name
+      is_external_ns, module = pcall(require, source)
+      if is_external_ns then
+        name = module.name or name
+        all_sources[name] = source
       else
-        -- could also be a root level module name
-        local exists, module = pcall(require, source)
-        if exists then
-          all_sources[name] = module.name or source
-        else
-          log.error("Source module not found", source)
-          name = nil
-        end
+        log.error("Source module not found", source)
+        name = nil
       end
     end
     if name then
+      default_config[name] = module.default_config or default_config[name]
       table.insert(all_source_names, name)
     end
   end
   log.debug("Sources to load: ", vim.inspect(all_sources))
   require("neo-tree.command.parser").setup(all_source_names)
 
+  -- setup the default values for all sources
+  normalize_mappings(default_config)
+  normalize_mappings(user_config)
+  merge_renderers(default_config, nil, user_config)
+
   for source_name, mod_root in pairs(all_sources) do
     local module = require(mod_root)
     default_config[source_name] = default_config[source_name]