Add a --version option

And fix that --reservation was missing from the optstring.

meson.build

@@ -1,4 +1,11 @@
-project('pdf-simple-sign', 'cpp', default_options : ['cpp_std=c++11'])
+project('pdf-simple-sign', 'cpp', default_options : ['cpp_std=c++11'],
+	version : '1.0')
+
+conf = configuration_data()
+conf.set('PROJECT_NAME', '"' + meson.project_name() + '"')
+conf.set('PROJECT_VERSION', '"' + meson.project_version() + '"')
+configure_file(output : 'config.h', configuration : conf)
+
 cryptodep = dependency('libcrypto')
 executable('pdf-simple-sign', 'pdf-simple-sign.cpp',
 	install : true,

pdf-simple-sign.cpp

@@ -37,6 +37,8 @@
 #include <openssl/x509v3.h>
 #include <openssl/pkcs12.h>
 
+#include "config.h"
+
 // -------------------------------------------------------------------------------------------------
 
 using uint = unsigned int;
@@ -952,6 +954,7 @@ int main(int argc, char* argv[]) {
 
   static struct option opts[] = {
     {"help", no_argument, 0, 'h'},
+    {"version", no_argument, 0, 'V'},
     {"reservation", required_argument, 0, 'r'},
     {nullptr, 0, 0, 0},
   };
@@ -961,7 +964,7 @@ int main(int argc, char* argv[]) {
   while (1) {
     int option_index = 0;
     auto c = getopt_long(argc, const_cast<char* const*>(argv),
-                         "h", opts, &option_index);
+                         "hVr:", opts, &option_index);
     if (c == -1)
       break;
 
@@ -972,6 +975,9 @@ int main(int argc, char* argv[]) {
       if (errno || *end || reservation <= 0 || reservation > USHRT_MAX)
         die(1, "%s: must be a positive number", optarg);
       break;
+    case 'V':
+      die(0, "%s", PROJECT_NAME " " PROJECT_VERSION);
+      break;
     case 'h':
     default:
       usage();