From ba35ab95f773d03cbcb3d403d99b0bbde9ccb57e Mon Sep 17 00:00:00 2001
From: Magnus Jacobsson <magnus.jacobsson@berotec.se>
Date: Sun, 20 Sep 2020 14:48:09 +0200
Subject: [PATCH] Add option -? for usage to Windows version of dotty

---
 cmd/dotty/mswin32/dotty.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/cmd/dotty/mswin32/dotty.c b/cmd/dotty/mswin32/dotty.c
index d92963c0b..ddaea5f6b 100644
--- a/cmd/dotty/mswin32/dotty.c
+++ b/cmd/dotty/mswin32/dotty.c
@@ -18,6 +18,7 @@
 #include <stdio.h>
 #include <string.h>
 #include <stdlib.h>
+#include <shellapi.h>
 #include <sys/types.h>
 #include <sys/stat.h>
 
@@ -41,6 +42,8 @@ int APIENTRY WinMain (
     char cmd[256];
     char *path;
     char *s;
+    int argc;
+    LPWSTR *argv;
 
     ZeroMemory (&si, sizeof(si));
     si.cb = sizeof(si);
@@ -56,6 +59,11 @@ int APIENTRY WinMain (
         if (!(path = buildpath ("lefty")))
             exit (1);
     }
+    argv = CommandLineToArgvW(lpCmdLine, &argc);
+    if (argc == 1 && strcmp(argv[0], "-?") == 0) {
+        fprintf(stderr, "usage: dotty [-V] [-lm (sync|async)] [-el (0|1)] <filename>\n");
+        exit(0);
+    }
     if (lpCmdLine[0] == 0)
         sprintf (
 	    cmd, "%s -e \"load('dotty.lefty');%sdotty.init();dotty.createviewandgraph(null,'file',null,null);txtview('off');\"",
-- 
2.50.1