dot -h displays help fix #4

dot.lua

@@ -28,6 +28,20 @@ local function parse_args()
       mock_brew = true
     elseif arg[i] == "--hooks" then
       hooks_mode = true
+    elseif arg[i] == "-h" then
+      print([[
+Usage: dot [options] [module/profile]
+
+Options:
+  -f            Force mode: replace existing configurations, backing them up to <config>.before-dot
+  --version     Display the version of dot
+  --purge       Purge mode: uninstall dependencies and remove configurations
+  --unlink      Unlink mode: remove symlinks but keep the config files in their destination
+  --mock-brew   Mock brew operations (for testing purposes)
+  --hooks       Run hooks even if dependencies haven't changed
+  -h            Display this help message
+]])
+      os.exit(0)
     else
       table.insert(args, arg[i])
     end

spec/dot_spec.lua

@@ -474,4 +474,16 @@ return {
     assert.is_true(is_link(settings), "Expected symlink for settings.json")
     assert.is_true(is_link(keybindings), "Expected symlink for keybindings.json")
   end)
+
+  it("should display help message with -h option", function()
+    -- Run dot.lua with -h option
+    local cmd = string.format("cd %q && HOME=%q lua %q -h", dotfiles_dir, home_dir, dot_executable)
+    local handle = io.popen(cmd)
+    local output = handle:read("*a")
+    handle:close()
+
+    -- Check if the output contains the expected start of the help message
+    local expected_start = "Usage: dot"
+    assert.is_true(output:find(expected_start, 1, true) ~= nil, "Help message not displayed correctly")
+  end)
 end)