Add option to print version from cli

src/control/XournalMain.cpp

@@ -267,16 +267,19 @@ auto XournalMain::run(int argc, char* argv[]) -> int {
     gchar** optFilename = nullptr;
     gchar* pdfFilename = nullptr;
     gchar* imgFilename = nullptr;
+    gboolean showVersion = false;
     int openAtPageNumber = -1;
 
     string create_pdf = _("PDF output filename");
     string create_img = _("Image output filename (.png / .svg)");
     string page_jump = _("Jump to Page (first Page: 1)");
     string audio_folder = _("Absolute path for the audio files playback");
+    string version = _("Get version of xournalpp");
     GOptionEntry options[] = {{"create-pdf", 'p', 0, G_OPTION_ARG_FILENAME, &pdfFilename, create_pdf.c_str(), nullptr},
                               {"create-img", 'i', 0, G_OPTION_ARG_FILENAME, &imgFilename, create_img.c_str(), nullptr},
                               {"page", 'n', 0, G_OPTION_ARG_INT, &openAtPageNumber, page_jump.c_str(), "N"},
                               {G_OPTION_REMAINING, 0, 0, G_OPTION_ARG_FILENAME_ARRAY, &optFilename, "<input>", nullptr},
+                              {"version", 0, 0, G_OPTION_ARG_NONE, &showVersion, version.c_str(), nullptr},
                               {nullptr}};
 
     g_option_context_add_main_entries(context, options, GETTEXT_PACKAGE);
@@ -299,6 +302,11 @@ auto XournalMain::run(int argc, char* argv[]) -> int {
         return exportImg(*optFilename, imgFilename);
     }
 
+    if (showVersion) {
+        g_printf("%s %s \n", PROJECT_NAME, PROJECT_VERSION);
+        return 0;
+    }
+
     // Checks for input method compatibility
 
     const char* imModule = g_getenv("GTK_IM_MODULE");