Add support for OSC color sequences

1 files changed, 79 insertions, 1 deletions

diff --git a/st.c b/st.c
index a9338e1..781dbf2 100644
--- a/st.c
+++ b/st.c
@@ -1843,6 +1843,42 @@ csireset(void)
 }
 
 void
+osc4_color_response(int num)
+{
+        int n;
+        char buf[32];
+        unsigned char r, g, b;
+
+        if (xgetcolor(num, &r, &g, &b)) {
+                fprintf(stderr, "erresc: failed to fetch osc4 color %d\n", num);
+                return;
+        }
+
+        n = snprintf(buf, sizeof buf, "\033]4;%d;rgb:%02x%02x/%02x%02x/%02x%02x\007",
+                     num, r, r, g, g, b, b);
+
+        ttywrite(buf, n, 1);
+}
+
+void
+osc_color_response(int index, int num)
+{
+        int n;
+        char buf[32];
+        unsigned char r, g, b;
+
+        if (xgetcolor(index, &r, &g, &b)) {
+                fprintf(stderr, "erresc: failed to fetch osc color %d\n", index);
+                return;
+        }
+
+        n = snprintf(buf, sizeof buf, "\033]%d;rgb:%02x%02x/%02x%02x/%02x%02x\007",
+                     num, r, r, g, g, b, b);
+
+        ttywrite(buf, n, 1);
+}
+
+void
 strhandle(void)
 {
         char *p = NULL, *dec;
@@ -1880,6 +1916,45 @@ strhandle(void)
                                 }
                         }
                         return;
+                case 10:
+                        if (narg < 2)
+                                break;
+
+                        p = strescseq.args[1];
+
+                        if (!strcmp(p, "?"))
+                                osc_color_response(defaultfg, 10);
+                        else if (xsetcolorname(defaultfg, p))
+                                fprintf(stderr, "erresc: invalid foreground color: %s\n", p);
+                        else
+                                redraw();
+                        break;
+                case 11:
+                        if (narg < 2)
+                                break;
+
+                        p = strescseq.args[1];
+
+                        if (!strcmp(p, "?"))
+                                osc_color_response(defaultbg, 11);
+                        else if (xsetcolorname(defaultbg, p))
+                                fprintf(stderr, "erresc: invalid background color: %s\n", p);
+                        else
+                                redraw();
+                        break;
+                case 12:
+                        if (narg < 2)
+                                break;
+
+                        p = strescseq.args[1];
+
+                        if (!strcmp(p, "?"))
+                                osc_color_response(defaultcs, 12);
+                        else if (xsetcolorname(defaultcs, p))
+                                fprintf(stderr, "erresc: invalid cursor color: %s\n", p);
+                        else
+                                redraw();
+                        break;
                 case 4: /* color set */
                         if (narg < 3)
                                 break;
@@ -1887,7 +1962,10 @@ strhandle(void)
                         /* FALLTHROUGH */
                 case 104: /* color reset, here p = NULL */
                         j = (narg > 1) ? atoi(strescseq.args[1]) : -1;
-                        if (xsetcolorname(j, p)) {
+
+                        if (!strcmp(p, "?"))
+                                osc4_color_response(j);
+                        else if (xsetcolorname(j, p)) {
                                 if (par == 104 && narg <= 1)
                                         return; /* color reset without parameter */
                                 fprintf(stderr, "erresc: invalid color j=%d, p=%s\n",