Support OSC 110, 111, and 112 for resetting colors

This adds support for OSC 110, 111, and 112 escape sequences to reset
the foreground, background, and cursor colors in the terminal. The
changes include handling these sequences in the `strhandle` function of
`st.c`, allowing applications to reset colors to their default values.

The OSC sequences originated from Xterm control sequences and are now
widely used in terminal applications and supported by many terminal
emulators. For applications, this allows them to reset colors to
default values without needing to know the colors beforehand.

Signed-off-by: Ayman Bagabas <ayman.bagabas@gmail.com>

1 files changed, 13 insertions, 0 deletions

diff --git a/st.c b/st.c
index 37f38c5..e9fea17 100644
--- a/st.c
+++ b/st.c
@@ -1967,6 +1967,19 @@ strhandle(void)
                                 tfulldirt();
                         }
                         return;
+                case 110:
+                case 111:
+                case 112:
+                        if (narg != 1)
+                                break;
+                        if ((j = par - 110) < 0 || j >= LEN(osc_table))
+                                break; /* shouldn't be possible */
+                        if (xsetcolorname(osc_table[j].idx, NULL)) {
+                                fprintf(stderr, "erresc: %s color not found\n", osc_table[j].str);
+                        } else {
+                                tfulldirt();
+                        }
+                        return;
                 }
                 break;
         case 'k': /* old title set compatibility */