src: Format help message and add --version to make man page generation easier

src/nghttp.cc

@@ -1654,14 +1654,18 @@ int run(char **uris, int n)
 }
 } // namespace
 
+namespace {
+void print_version(std::ostream& out)
+{
+  out << "nghttp nghttp2/" NGHTTP2_VERSION << std::endl;
+}
+} // namespace
+
 namespace {
 void print_usage(std::ostream& out)
 {
-  out << "Usage: nghttp [-Oansuv] [-t <SECONDS>] [-w <WINDOW_BITS>] [-W <WINDOW_BITS>]\n"
-      << "              [--cert=<CERT>] [--key=<KEY>] [-d <FILE>] [-m <N>]\n"
-      << "              [-p <PRIORITY>] [-M <N>] [-b <ALIGNMENT>]\n"
-      << "              <URI>..."
-      << std::endl;
+  out << "Usage: nghttp [OPTIONS]... <URI>...\n"
+      << "HTTP/2 experimental client" << std::endl;
 }
 } // namespace
 
@@ -1670,7 +1674,8 @@ void print_help(std::ostream& out)
 {
   print_usage(out);
   out << "\n"
-      << "OPTIONS:\n"
+      << "  <URI>              Specify URI to access.\n"
+      << "Options:\n"
       << "  -v, --verbose      Print debug information such as reception/\n"
       << "                     transmission of frames and name/value pairs.\n"
       << "  -n, --null-out     Discard downloaded data.\n"
@@ -1720,6 +1725,8 @@ void print_help(std::ostream& out)
       << "                     padding. Specify 0 to disable padding.\n"
       << "  --color            Force colored log output.\n"
       << "  --continuation     Send large header to test CONTINUATION.\n"
+      << "  --version          Display version information and exit.\n"
+      << "  -h, --help         Display this help and exit.\n"
       << std::endl;
 }
 } // namespace
@@ -1751,6 +1758,7 @@ int main(int argc, char **argv)
       {"key", required_argument, &flag, 2},
       {"color", no_argument, &flag, 3},
       {"continuation", no_argument, &flag, 4},
+      {"version", no_argument, &flag, 5},
       {nullptr, 0, nullptr, 0 }
     };
     int option_index = 0;
@@ -1889,6 +1897,10 @@ int main(int argc, char **argv)
         // continuation option
         config.continuation = true;
         break;
+      case 5:
+        // version option
+        print_version(std::cout);
+        exit(EXIT_SUCCESS);
       }
       break;
     default:

src/nghttpd.cc

@@ -72,12 +72,19 @@ int parse_push_config(Config& config, const char *optarg)
 }
 } // namespace
 
+namespace {
+void print_version(std::ostream& out)
+{
+  out << "nghttpd nghttp2/" NGHTTP2_VERSION << std::endl;
+}
+} // namespace
+
 namespace {
 void print_usage(std::ostream& out)
 {
-  out << "Usage: nghttpd [-DVhpv] [-d <PATH>] [--no-tls] [-b <ALIGNMENT>]\n"
-      << "               <PORT> [<PRIVATE_KEY> <CERT>]"
-      << std::endl;
+  out << "Usage: nghttpd [OPTION]... <PORT> <PRIVATE_KEY> <CERT>\n"
+      << "  or:  nghttpd --no-tls [OPTION]... <PORT>\n"
+      << "HTTP/2 experimental server" << std::endl;
 }
 } // namespace
 
@@ -86,7 +93,13 @@ void print_help(std::ostream& out)
 {
   print_usage(out);
   out << "\n"
-      << "OPTIONS:\n"
+      << "  <PORT>             Specify listening port number.\n"
+      << "  <PRIVATE_KEY>      Set path to server's private key. Required\n"
+      << "                     unless --no-tls is specified.\n"
+      << "  <CERT>             Set path to server's certificate. Required\n"
+      << "                     unless --no-tls is specified.\n"
+      << "\n"
+      << "Options:\n"
       << "  -D, --daemon       Run in a background. If -D is used, the\n"
       << "                     current working directory is changed to '/'.\n"
       << "                     Therefore if this option is used, -d option\n"
@@ -117,7 +130,8 @@ void print_help(std::ostream& out)
       << "                     root. See --htdocs option.\n"
       << "  -b, --padding=<N>  Add at most <N> bytes to a frame payload as\n"
       << "                     padding. Specify 0 to disable padding.\n"
-      << "    -h, --help         Print this help.\n"
+      << "  --version          Display version information and exit.\n"
+      << "  -h, --help         Display this help and exit.\n"
       << std::endl;
 }
 } // namespace
@@ -139,6 +153,7 @@ int main(int argc, char **argv)
       {"padding", required_argument, nullptr, 'b'},
       {"no-tls", no_argument, &flag, 1},
       {"color", no_argument, &flag, 2},
+      {"version", no_argument, &flag, 3},
       {nullptr, 0, nullptr, 0}
     };
     int option_index = 0;
@@ -192,6 +207,10 @@ int main(int argc, char **argv)
         // color option
         color = true;
         break;
+      case 3:
+        // version
+        print_version(std::cout);
+        exit(EXIT_SUCCESS);
       }
       break;
     default:

src/shrpx.cc

@@ -462,12 +462,8 @@ void print_version(std::ostream& out)
 namespace {
 void print_usage(std::ostream& out)
 {
-  out << "Usage: nghttpx [-Dh] [-s|--client|-p] [-b <HOST,PORT>]\n"
-      << "               [-f <HOST,PORT>] [-n <CORES>] [-c <NUM>] [-L <LEVEL>]\n"
-      << "               [OPTIONS...] [<PRIVATE_KEY> <CERT>]\n"
-      << "\n"
-      << "A reverse proxy for HTTP/2, HTTP/1 and SPDY.\n"
-      << std::endl;
+  out << "Usage: nghttpx [OPTIONS]... [<PRIVATE_KEY> <CERT>]\n"
+      << "A reverse proxy for HTTP/2, HTTP/1 and SPDY." << std::endl;
 }
 } // namespace
 
@@ -475,15 +471,15 @@ namespace {
 void print_help(std::ostream& out)
 {
   print_usage(out);
-  out << "Positional arguments:\n"
+  out << "\n"
       << "  <PRIVATE_KEY>      Set path to server's private key. Required\n"
       << "                     unless -p, --client or --frontend-no-tls\n"
       << "                     are given.\n"
       << "  <CERT>             Set path to server's certificate. Required\n"
       << "                     unless -p, --client or --frontend-no-tls\n"
       << "                     are given.\n"
-      << "\n"
-      << "OPTIONS:\n"
+      << "Options:\n"
+      << "  The options are categorized into several groups.\n"
       << "\n"
       << "Connections:\n"
       << "  -b, --backend=<HOST,PORT>\n"