Add check that looks if rofi is running inside rofi script mode.

Examples/test_script_env.sh

@@ -1,5 +1,9 @@
 #!/usr/bin/env bash
 
-
+if [ -z "${ROFI_OUTSIDE}" ]
+then
+    echo "run this script in rofi".
+    exit
+fi
 echo -en "\x00no-custom\x1ftrue\n"
 echo "${ROFI_RETV}"

source/dialogs/script.c

@@ -157,6 +157,10 @@ static DmenuScriptEntry *execute_executor ( Mode *sw, char *arg, unsigned int *l
     env = g_environ_setenv ( env, "ROFI_RETV", str_value, TRUE);
     g_free ( str_value );
 
+    str_value = g_strdup_printf("%d", (int) getpid());
+    env = g_environ_setenv ( env, "ROFI_OUTSIDE", str_value, TRUE);
+    g_free ( str_value );
+
 
     if ( g_shell_parse_argv ( sw->ed, &argc, &argv, &error ) ) {
         argv           = g_realloc ( argv, ( argc + 2 ) * sizeof ( char* ) );

source/rofi.c

@@ -788,6 +788,17 @@ int main ( int argc, char *argv[] )
         return EXIT_SUCCESS;
     }
 
+    {
+        const char *ro_pid = g_getenv("ROFI_OUTSIDE");
+        if ( ro_pid != NULL ) {
+            int ro_pidi = g_ascii_strtoll ( ro_pid, NULL, 0 );
+            if ( kill ( ro_pidi, 0 ) == 0 ) {
+                    printf ( "Do not launch rofi from inside rofi.\r\n" );
+                    return EXIT_FAILURE;
+            }
+        }
+    }
+
     // Detect if we are in dmenu mode.
     // This has two possible causes.
     // 1 the user specifies it on the command-line.