Make demo enable mouse mode if given on commandline

demo.c

@@ -1,4 +1,5 @@
 #include <stdio.h>
+#include <getopt.h>
 
 #include "termkey.h"
 
@@ -6,8 +7,27 @@ int main(int argc, char *argv[])
 {
   TERMKEY_CHECK_VERSION;
 
+  int mouse = 0;
+
   char buffer[50];
-  TermKey *tk = termkey_new(0, 0);
+  TermKey *tk;
+
+  int opt;
+  while((opt = getopt(argc, argv, "m::")) != -1) {
+    switch(opt) {
+    case 'm':
+      if(optarg)
+        mouse = atoi(optarg);
+      else
+        mouse = 1000;
+      break;
+    default:
+      fprintf(stderr, "Usage: %s [-m]\n", argv[0]);
+      return 1;
+    }
+  }
+
+  tk = termkey_new(0, 0);
 
   if(!tk) {
     fprintf(stderr, "Cannot allocate termkey instance\n");
@@ -17,6 +37,9 @@ int main(int argc, char *argv[])
   TermKeyResult ret;
   TermKeyKey key;
 
+  if(mouse)
+    printf("\e[?%dhMouse mode active\n", mouse);
+
   while((ret = termkey_waitkey(tk, &key)) != TERMKEY_RES_EOF) {
     termkey_snprint_key(tk, buffer, sizeof buffer, &key, TERMKEY_FORMAT_VIM);
     printf("%s\n", buffer);
@@ -27,5 +50,8 @@ int main(int argc, char *argv[])
       break;
   }
 
+  if(mouse)
+    printf("\e[?%dlMouse mode deactivated\n", mouse);
+
   termkey_destroy(tk);
 }