add option to print webfuse version

doc/webfuse.md

@@ -18,6 +18,7 @@ filesystem via fuse and exposes it's API via websockets.
 | --wf- authenticator | path | -      | Optional. Specify the file path of the authenticator executable |
 | --wf-auth-header | name | -         | Optional. Specify the name of the HTTP header used for authentication |
 | --wf-timeout | timeout  | 10        | Optional. Specify the communication timeout. |
+| --wf-version | -        | -         | Print version and exit. |
 
 ## Fuse options
 

src/webfuse/webfuse.cpp

@@ -2,6 +2,7 @@
 #include "webfuse/fuse.hpp"
 #include "webfuse/filesystem.hpp"
 #include "webfuse/ws/server.hpp"
+#include "webfuse/version.hpp"
 
 #include <iostream>
 
@@ -23,6 +24,9 @@ int app::run(int argc, char * argv[]) // NOLINT(readability-convert-member-funct
                 config.exit_code = fuse_fs.run(config.args.get_argc(), config.args.get_argv());
             }
             break;
+        case command::print_version:
+            std::cout << webfuse::get_version() << std::endl;
+            break;
         case command::show_help:
             // fall-through
         default:
@@ -37,6 +41,7 @@ WEBFUSE options:
     --wf-authenticator PATH     path of authenticatior app (optional)
     --wf-auth-header   NAME     name of the authentication header (optional)
     --wf-timeout       TIMEOUT  communication timeout in seconds (default: 10)
+    --wf-version                print version and exit
 )";
             }
             break;

src/webfuse/ws/config.cpp

@@ -112,6 +112,10 @@ ws_config::ws_config(int argc, char * argv[])
                 timeout_secs = static_cast<uint64_t>(std::stoi(timeout_str));
             }
         }
+        else if (arg == "--wf-version")
+        {
+            cmd = command::print_version;
+        }
         else
         {
             args.push(arg.c_str());

src/webfuse/ws/config.hpp

@@ -12,6 +12,7 @@ namespace webfuse
 enum class command
 {
     run,
+    print_version,
     show_help
 };