Add linux manpage and update main accordingly

docs/vimix.1

@@ -0,0 +1,63 @@
+.\"Created by Bruno Herbelin
+
+.TH vimix 1 "March 2022" "0.7.0" "vimix manpage"
+
+.SH NAME
+vimix \- Video live mixer
+
+..SH SYNOPSIS
+.B vimix
+.RI [ OPTIONS ]
+.RI [ FILE ]
+.br
+
+.SH DESCRIPTION
+.B vimix
+performs graphical mixing and blending of several movie clips and computer generated graphics, with image processing effects in real-time.
+
+Its intuitive and hands-on user interface gives direct control on image opacity and shape for producing live graphics during concerts or VJ-ing sessions.
+
+The output image is typically projected full-screen on an external monitor or a projector, but can be streamed live (SRT) or recorded (no audio).
+
+.SH OPTIONS
+
+.TP
+.BR \-V ", " \-\^\-version
+Output the version number of
+.B vimix
+and exit.
+
+.TP
+.BR \-C ", " \-\^\-clean
+Clean the user stored preferences of
+.B vimix
+and exit.
+
+.TP
+.BR \-T ", " \-\^\-test
+Perform a minimal rendering test and exit.
+
+.SH FILE
+
+Launches 
+.B vimix
+and tries to open the provided session file (.mix extension).
+
+.SH "SEE ALSO"
+.SS "Regular Manual Pages"
+.BR gst-launch-1.0 (1),
+.BR gst-inspect-1.0 (1)
+
+.SS "Documentation"
+A user manual and tutorials are available online (https://github.com/brunoherbelin/vimix/wiki).
+
+.SH BUGS
+.SS "Reporting bugs"
+Report bugs and issues on github (https://github.com/brunoherbelin/vimix).
+
+.SH COPYRIGHT
+GPL3+ license
+.PP
+Copyright (c) 2022 Bruno Herbelin
+.PP
+This document is part of the vimix software.

main.cpp

@@ -64,26 +64,35 @@ int main(int argc, char *argv[])
     // one extra argument is given
     if (argc == 2) {
         std::string argument(argv[1]);
-        if (argument == "--clean" || argument == "-c") {
+        if (argument[0] == '-') {
-            // clean start if requested : Save empty settings before loading
+            if (argument == "--clean" || argument == "-C") {
-            Settings::Save();
+                // clean start if requested : Save empty settings before loading
-            return 0;
+                Settings::Save();
-        }
+                fprintf(stderr, "%s: clean OK\n", APP_NAME);
-        else if (argument == "--version" || argument == "-v") {
+                return 0;
+            }
+            else if (argument == "--version" || argument == "-V") {
 #ifdef VIMIX_VERSION_MAJOR
-            fprintf(stderr, "%s %d.%d.%d\n", APP_NAME, VIMIX_VERSION_MAJOR, VIMIX_VERSION_MINOR, VIMIX_VERSION_PATCH);
+                fprintf(stderr, "%s: version %d.%d.%d\n", APP_NAME, VIMIX_VERSION_MAJOR, VIMIX_VERSION_MINOR, VIMIX_VERSION_PATCH);
 #else
-            fprintf(stderr, "%s\n", APP_NAME);
+                fprintf(stderr, "%s\n", APP_NAME);
 #endif
-            return 0;
+                return 0;
-        }
+            }
-        else if (argument == "--test" || argument == "-t") {
+            else if (argument == "--test" || argument == "-T") {
-            if ( !Rendering::manager().init() ) {
+                if ( !Rendering::manager().init() ) {
-                fprintf(stderr, "%s Failed\n", APP_NAME);
+                    fprintf(stderr, "%s: test Failed\n", APP_NAME);
+                    return 1;
+                }
+                fprintf(stderr, "%s: test OK\n", APP_NAME);
+                return 0;
+            }
+            else {
+                fprintf(stderr, "%s: unrecognized option '%s'\n"
+                        "Usage: %s [-V, --version][-T, --test][-C, --clean][FILE]\n",
+                        APP_NAME, argument.c_str(), APP_NAME);
                 return 1;
             }
-            fprintf(stderr, "%s OK\n", APP_NAME);
-            return 0;
         }
         else {
             // try to open the file