fix: show errors when reload after installation fails

2 files changed, 10 insertions, 7 deletions

diff --git a/lua/nvim-treesitter/configs.lua b/lua/nvim-treesitter/configs.lua
index 0b9eaa512..87f930b8f 100644
--- a/lua/nvim-treesitter/configs.lua
+++ b/lua/nvim-treesitter/configs.lua
@@ -232,7 +232,7 @@ end
 
 ---Recurses through all modules including submodules
 ---@param accumulator function called for each module
----@param root {[string]: TSModule} root configuration table to start at
+---@param root {[string]: TSModule}|nil root configuration table to start at
 ---@param path string|nil prefix path
 local function recurse_modules(accumulator, root, path)
   root = root or config.modules
@@ -529,7 +529,7 @@ function M.reattach_module(mod_name, bufnr, lang)
 end
 
 ---Gets available modules
----@param root {[string]:TSModule} table to find modules
+---@param root {[string]:TSModule}|nil table to find modules
 function M.available_modules(root)
   local modules = {}
 
diff --git a/lua/nvim-treesitter/install.lua b/lua/nvim-treesitter/install.lua
index 1b16d5e01..c0128130b 100644
--- a/lua/nvim-treesitter/install.lua
+++ b/lua/nvim-treesitter/install.lua
@@ -44,15 +44,18 @@ end
 
 ---@param lang string
 ---@return function
-local function reattach_if_possible_fn(lang)
+local function reattach_if_possible_fn(lang, error_on_fail)
   return function()
     for _, buf in ipairs(vim.api.nvim_list_bufs()) do
       if parsers.get_buf_lang(buf) == lang then
         vim._ts_remove_language(lang)
-        local ok = pcall(vim.treesitter.language.require_language, lang)
+        local ok, err = pcall(vim.treesitter.language.require_language, lang)
+        if not ok and error_on_fail then
+          vim.notify("Could not load parser for " .. lang .. ": " .. vim.inspect(err))
+        end
         for _, mod in ipairs(require("nvim-treesitter.configs").available_modules()) do
           if ok then
-            require("nvim-treesitter.configs").reattach_module(mod, buf)
+            require("nvim-treesitter.configs").reattach_module(mod, buf, lang)
           else
             require("nvim-treesitter.configs").detach_module(mod, buf)
           end
@@ -404,7 +407,7 @@ local function run_install(cache_folder, install_folder, lang, repo, with_sync,
       end,
     },
     { -- auto-attach modules after installation
-      cmd = reattach_if_possible_fn(lang),
+      cmd = reattach_if_possible_fn(lang, true),
     },
   })
   if not from_local_path then
@@ -605,7 +608,7 @@ function M.uninstall(...)
             end,
           },
           { -- auto-reattach or detach modules after uninstallation
-            cmd = reattach_if_possible_fn(lang),
+            cmd = reattach_if_possible_fn(lang, false),
           },
         }
         M.iter_cmd(command_list, 1, lang, "Treesitter parser for " .. lang .. " has been uninstalled")