[termdesc] query default foreground color #2432

src/lib/in.c

@@ -1219,6 +1219,27 @@ decrpm_asu_cb(inputctx* ictx){
   return 2;
 }
 
+static int
+get_default_color(const char* str, uint32_t* color){
+  int r, g, b;
+  if(sscanf(str, "%02x/%02x/%02x", &r, &g, &b) == 3){
+    // great! =]
+  }else if(sscanf(str, "%04x/%04x/%04x", &r, &g, &b) == 3){
+    r /= 256;
+    g /= 256;
+    b /= 256;
+  }else{
+    logerror("couldn't extract rgb from %s\n", str);
+    return -1;
+  }
+  if(r < 0 || g < 0 || b < 0){
+    logerror("invalid colors %d %d %d\n", r, g, b);
+    return -1;
+  }
+  *color = (r << 16u) | (g << 8u) | b;
+  return 0;
+}
+
 static int
 bgdef_cb(inputctx* ictx){
   if(ictx->initdata){
@@ -1226,20 +1247,27 @@ bgdef_cb(inputctx* ictx){
     if(str == NULL){
       logerror("empty bg string\n");
     }else{
-      int r, g, b;
-      if(sscanf(str, "%02x/%02x/%02x", &r, &g, &b) == 3){
-        // great! =]
-      }else if(sscanf(str, "%04x/%04x/%04x", &r, &g, &b) == 3){
-        r /= 256;
-        g /= 256;
-        b /= 256;
-      }else{
-        logerror("couldn't extract rgb from %s\n", str);
-        r = g = b = 0;
+      if(get_default_color(str, &ictx->initdata->bg) == 0){
+        ictx->initdata->got_bg = true;
+        loginfo("default background 0x%06x\n", ictx->initdata->bg);
+      }
+      free(str);
+    }
+  }
+  return 2;
+}
+
+static int
+fgdef_cb(inputctx* ictx){
+  if(ictx->initdata){
+    char* str = amata_next_string(&ictx->amata, "\x1b]10;rgb:");
+    if(str == NULL){
+      logerror("empty fg string\n");
+    }else{
+      if(get_default_color(str, &ictx->initdata->fg) == 0){
+        ictx->initdata->got_fg = true;
+        loginfo("default foreground 0x%06x\n", ictx->initdata->fg);
       }
-      ictx->initdata->bg = (r << 16u) | (g << 8u) | b;
-      ictx->initdata->got_bg = true;
-      loginfo("default background 0x%02x%02x%02x\n", r, g, b);
       free(str);
     }
   }
@@ -1467,6 +1495,7 @@ build_cflow_automaton(inputctx* ictx){
     // OSC (\e_...ST)
     { "_G\\S", kittygraph_cb, },
     // a mystery to everyone!
+    { "]10;rgb:\\S", fgdef_cb, },
     { "]11;rgb:\\S", bgdef_cb, },
     { NULL, NULL, },
   }, *csi;

src/lib/in.h

@@ -61,7 +61,9 @@ struct initial_responses {
   queried_terminals_e qterm;   // determined terminal
   unsigned kitty_graphics;     // kitty graphics supported
   uint32_t bg;                 // default background
+  uint32_t fg;                 // default foreground
   bool got_bg;                 // have we read default background?
+  bool got_fg;                 // have we read default foreground?
   bool rgb;                    // was RGB DirectColor advertised?
   int pixx;                    // screen geometry in pixels
   int pixy;                    // screen geometry in pixels

src/lib/termdesc.c

@@ -361,6 +361,7 @@ init_terminfo_esc(tinfo* ti, const char* name, escape_e idx,
 // unlike most other queries, so send this first since it will take longer to be
 // answered. note the "\x1b]"; this is an Operating System Command, not CSI.
 #define DEFBGQ "\x1b]11;?\e\\"
+#define DEFFGQ "\x1b]10;?\e\\"
 
 // FIXME ought be using the u7 terminfo string here, if it exists. the great
 // thing is, if we get a response to this, we know we can use it for u7!
@@ -386,7 +387,8 @@ init_terminfo_esc(tinfo* ti, const char* name, escape_e idx,
 // request the cell geometry of the textual area
 #define GEOMCELL "\x1b[18t"
 
-#define DIRECTIVES DEFBGQ \
+#define DIRECTIVES DEFFGQ \
+                   DEFBGQ \
                    KKBDQUERY \
                    SUMQUERY \
                    "\x1b[?1;3;256S" /* try to set 256 cregs */ \