termptyesc: handle OSC 11 that reports background color

It can also be used to set background color but that's not implemented

src/bin/termptyesc.c

@@ -32,6 +32,10 @@
 #define OSC 0x9d
 #define DEL 0x7f
 
+#define TERMPTY_WRITE_STR(_S) \
+   termpty_write(ty, _S, strlen(_S))
+
+
 /* XXX: all handle_ functions return the number of bytes successfully read, 0
  * if not enough bytes could be read
  */
@@ -3633,6 +3637,34 @@ _handle_xterm_777_command(Termpty *ty,
    *title_end = ';';
 }
 
+static void
+_handle_xterm_11_command(Termpty *ty, Eina_Unicode *p)
+{
+   int r = 0, g = 0, b = 0;
+   char buf[32];
+   size_t l;
+
+   if (!*p)
+     goto err;
+
+   /* only support query mode for the moment */
+   if (*p != '?')
+     goto err;
+
+   if (termpty_color_class_get(ty, "BG", &r, &g, &b, NULL) != 0)
+     {
+        ERR("error getting color class 'BG'");
+     }
+   TERMPTY_WRITE_STR("\033]11;rgb:");
+   l = snprintf(buf, sizeof(buf), "%.2X/%.2X/%.2X", r, g, b);
+   termpty_write(ty, buf, l);
+   TERMPTY_WRITE_STR("\007");
+
+   return;
+err:
+   ty->decoding_error = EINA_TRUE;
+}
+
 static int
 _handle_esc_osc(Termpty *ty, const Eina_Unicode *c, const Eina_Unicode *ce)
 {
@@ -3670,9 +3702,6 @@ _handle_esc_osc(Termpty *ty, const Eina_Unicode *c, const Eina_Unicode *ce)
    else
      return 0;
 
-#define TERMPTY_WRITE_STR(_S) \
-   termpty_write(ty, _S, strlen(_S))
-
    arg = _osc_arg_get(&p);
    switch (arg)
      {
@@ -3777,6 +3806,9 @@ _handle_esc_osc(Termpty *ty, const Eina_Unicode *c, const Eina_Unicode *ce)
 #endif
           }
         break;
+      case 11:
+        _handle_xterm_11_command(ty, p);
+        break;
       case 50:
         DBG("xterm font support");
         if (!*p)
@@ -3804,8 +3836,6 @@ _handle_esc_osc(Termpty *ty, const Eina_Unicode *c, const Eina_Unicode *ce)
         break;
      }
 
-#undef TERMPTY_WRITE_STR
-
     return cc - c;
 err:
     WRN("invalid xterm sequence");

src/bin/tyfuzz.c

@@ -233,10 +233,14 @@ termpty_color_class_get(Termpty *ty EINA_UNUSED, const char *key,
 {
    if (strncmp(key, "BG", strlen("BG")) == 0)
      {
-        *r = 131;
-        *g = 132;
-        *b = 133;
-        *a = 134;
+        if (r)
+          *r = 131;
+        if (g)
+          *g = 132;
+        if (b)
+          *b = 133;
+        if (a)
+          *a = 134;
         return 0;
      }
    return -1;

tests/osc-11-query.sh

@@ -0,0 +1,6 @@
+#!/bin/sh
+
+# query background color
+printf '\033]11;?\007'
+sleep 0.1
+#should print ^]]11;rgb:83/84/85^G

tests/tests.results

@@ -121,3 +121,4 @@ mouse_reporting_mode_normal_ext_urxvt.sh bf68099047410f102e71d2e451875c69
 mouse_reporting_mode_mouse_move_pressed_ext_urxvt.sh 59f3e59b60b3a43260de6a80135489eb
 mouse_reporting_mode_all_ext_urxvt.sh a11bbc8ebea42d06cc3ad823b52c09b3
 shift_in_out.sh 3896bcc6887998bbc41b43840a6b2e33
+osc-11-query.sh fa4a07e289cc7b223404bb580dc413bf