chore(ci): make check compatible within nix shell

Updates Makefile to avoid nested nix develop calls, ensuring make check/test work inside CI shell. Fixes luacheck warnings.

Co-authored-by: ThomasK33 <[email protected]>

Author: blink-so[bot]

Makefile

@@ -6,9 +6,14 @@ all: format check test
 # Check for syntax errors
 check:
 	@echo "Checking Lua files for syntax errors..."
-	nix develop .#ci -c find lua -name "*.lua" -type f -exec lua -e "assert(loadfile('{}'))" \;
+ifeq (,$(IN_NIX_SHELL))
+	NIX_PREFIX=nix develop .#ci -c
+else
+	NIX_PREFIX=
+endif
+	$(NIX_PREFIX) find lua -name "*.lua" -type f -exec lua -e "assert(loadfile('{}'))" \;
 	@echo "Running luacheck..."
-	nix develop .#ci -c luacheck lua/ tests/ --no-unused-args --no-max-line-length
+	$(NIX_PREFIX) luacheck lua/ tests/ --no-unused-args --no-max-line-length
 
 # Format all files
 format:

lua/claudecode/diff.lua

@@ -225,12 +225,6 @@ function M._cleanup_diff_layout(tab_name, target_win, new_win)
   logger.debug("diff", "[CLEANUP] Layout cleanup completed for:", tab_name)
 end
 
---- Open diff using native Neovim functionality
--- @param old_file_path string Path to the original file
--- @param new_file_path string Path to the new file (used for naming)
--- @param new_file_contents string Contents of the new file
--- @param tab_name string Name for the diff tab/view
--- @return table Result with provider, tab_name, and success status
 -- Detect filetype from a path or existing buffer (best-effort)
 local function _detect_filetype(path, buf)
   -- 1) Try Neovim's builtin matcher if available (>=0.10)
@@ -276,6 +270,13 @@ local function _detect_filetype(path, buf)
   return simple_map[ext]
 end
 
+--- Open diff using native Neovim functionality
+-- @param old_file_path string Path to the original file
+-- @param new_file_path string Path to the new file (used for naming)
+-- @param new_file_contents string Contents of the new file
+-- @param tab_name string Name for the diff tab/view
+-- @return table Result with provider, tab_name, and success status
+
 function M._open_native_diff(old_file_path, new_file_path, new_file_contents, tab_name)
   local new_filename = vim.fn.fnamemodify(new_file_path, ":t") .. ".new"
   local tmp_file, err = M._create_temp_file(new_file_contents, new_filename)