terminfo: working on Ghostty's terminfo

src/terminfo/ghostty.zig

@@ -0,0 +1,92 @@
+const std = @import("std");
+const Source = @import("Source.zig");
+
+/// Ghostty's terminfo entry.
+pub const ghostty: Source = .{
+    .names = &.{
+        "ghostty",
+        "xterm-ghostty",
+        "Ghostty",
+    },
+
+    // NOTE: These capabilities are super underdocumented and I'm not 100%
+    // I've got the list or my understanding of any in this list fully correct.
+    // As we learn more, please update the comments to better explain what
+    // anything means.
+    //
+    // I've marked some capabilities as "???" if I don't understand what they
+    // mean but I just assume I support since other modern terminals do. In
+    // this case, I'd love if anyone could help explain what this means and
+    // verify that Ghostty does indeed support it and if not we can fix it.
+    .capabilities = &.{
+        // automatic right margin -- when reaching the end of a line, text is
+        // wrapped to the next line.
+        .{ .name = "am", .value = .{ .boolean = {} } },
+
+        // background color erase -- screen is erased with the background color
+        .{ .name = "bce", .value = .{ .boolean = {} } },
+
+        // terminal can change color definitions, i.e. we can change the color
+        // palette. TODO: this may require implementing CSI 4 which we don't
+        // at the time of writing this comment.
+        .{ .name = "ccc", .value = .{ .boolean = {} } },
+
+        // supports changing the window title.
+        .{ .name = "hs", .value = .{ .boolean = {} } },
+
+        // terminal has a meta key
+        .{ .name = "km", .value = .{ .boolean = {} } },
+
+        // terminal will not echo input on the screen on its own
+        .{ .name = "mc5i", .value = .{ .boolean = {} } },
+
+        // safe to move (move what?) while in insert/standout mode. (???)
+        .{ .name = "mir", .value = .{ .boolean = {} } },
+        .{ .name = "msgr", .value = .{ .boolean = {} } },
+
+        // no pad character (???)
+        .{ .name = "npc", .value = .{ .boolean = {} } },
+
+        // newline ignored after 80 cols (???)
+        .{ .name = "xenl", .value = .{ .boolean = {} } },
+
+        // Tmux "truecolor" mode. Other programs also use this to detect
+        // if the terminal supports "truecolor". This means that the terminal
+        // can display 24-bit RGB colors.
+        .{ .name = "Tc", .value = .{ .boolean = {} } },
+
+        // Colored underlines. https://sw.kovidgoyal.net/kitty/underlines/
+        .{ .name = "Su", .value = .{ .boolean = {} } },
+
+        // Full keyboard support using Kitty's keyboard protocol:
+        // https://sw.kovidgoyal.net/kitty/keyboard-protocol/
+        // Commented out because we don't yet support this.
+        // .{ .name = "fullkbd", .value = .{ .boolean = {} } },
+
+        // Number of colors in the color palette.
+        .{ .name = "colors", .value = .{ .numeric = 256 } },
+
+        // Number of columns in a line. Our terminal is variable width on
+        // Window resize but this appears to just be the value set by most
+        // terminals.
+        .{ .name = "cols", .value = .{ .numeric = 80 } },
+
+        // Initial tabstop interval.
+        .{ .name = "it", .value = .{ .numeric = 8 } },
+
+        // Number of lines on a page. Similar to cols this is variable width
+        // but this appears to be the value set by most terminals.
+        .{ .name = "lines", .value = .{ .numeric = 24 } },
+
+        // Number of color pairs on the screen.
+        .{ .name = "pairs", .value = .{ .numeric = 32767 } },
+    },
+};
+
+test "encode" {
+    // Encode
+    var buf: [1024]u8 = undefined;
+    var buf_stream = std.io.fixedBufferStream(&buf);
+    try ghostty.encode(buf_stream.writer());
+    try std.testing.expect(buf_stream.getWritten().len > 0);
+}

src/terminfo/main.zig

@@ -5,6 +5,7 @@
 //! the archaic (imo) terminfo format by hand. But eventually we may want to
 //! extract this into a more full-featured library on its own.
 
+pub const ghostty = @import("ghostty.zig");
 pub const Source = @import("Source.zig");
 
 test {