fix build. update doc.

1 files changed, 8 insertions, 3 deletions

diff --git a/src/yue.cpp b/src/yue.cpp
index 49fa3e1..4f5be8d 100644
--- a/src/yue.cpp
+++ b/src/yue.cpp
@@ -196,7 +196,7 @@ static std::string compileFile(const fs::path& srcFile, yue::YueConfig conf, con
 
 class UpdateListener : public efsw::FileWatchListener {
 public:
-        void handleFileAction(efsw::WatchID, const std::string& dir, const std::string& filename, efsw::Action action, std::string oldFilename) override {
+        void handleFileAction(efsw::WatchID, const std::string& dir, const std::string& filename, efsw::Action action, std::string) override {
                 switch(action) {
                         case efsw::Actions::Add:
                                 if (auto res = compileFile(fs::path(dir) / filename, config, workPath); !res.empty()) {
@@ -246,6 +246,7 @@ int main(int narg, const char** args) {
                 "   -b       Dump compile time (doesn't write output)\n"
                 "   -g       Dump global variables used in NAME LINE COLUMN\n"
                 "   -l       Write line numbers from source codes\n"
+                "   -w path  Watch changes and compile every file under directory\n"
                 "   -v       Print version\n"
 #ifndef YUE_COMPILER_ONLY
                 "   --       Read from standard in, print to standard out\n"
@@ -581,14 +582,18 @@ int main(int narg, const char** args) {
                 }
         }
         if (!watchFiles && files.empty()) {
-                std::cout << help;
+                std::cout << "no input files\n"sv;
                 return 0;
         }
         if (!resultFile.empty() && files.size() > 1) {
                 std::cout << "Error: -o can not be used with multiple input files\n"sv;
-                std::cout << help;
+                return 1;
         }
         if (watchFiles) {
+                if (!targetPath.empty()) {
+                        std::cout << "Error: -t can not be used with watching mode\n"sv;
+                        return 1;
+                }
                 auto fullWorkPath = fs::absolute(fs::path(workPath)).string();
                 std::list<std::future<std::string>> results;
                 for (const auto& file : files) {