add ability to specify RGB colors as names from the X11 rgb name list

src/cli/action.zig

@@ -5,6 +5,7 @@ const list_fonts = @import("list_fonts.zig");
 const version = @import("version.zig");
 const list_keybinds = @import("list_keybinds.zig");
 const list_themes = @import("list_themes.zig");
+const list_colors = @import("list_colors.zig");
 
 /// Special commands that can be invoked via CLI flags. These are all
 /// invoked by using `+<action>` as a CLI flag. The only exception is
@@ -22,6 +23,9 @@ pub const Action = enum {
     /// List available themes
     @"list-themes",
 
+    /// List named RGB colors
+    @"list-colors",
+
     pub const Error = error{
         /// Multiple actions were detected. You can specify at most one
         /// action on the CLI otherwise the behavior desired is ambiguous.
@@ -62,6 +66,7 @@ pub const Action = enum {
             .@"list-fonts" => try list_fonts.run(alloc),
             .@"list-keybinds" => try list_keybinds.run(alloc),
             .@"list-themes" => try list_themes.run(alloc),
+            .@"list-colors" => try list_colors.run(alloc),
         };
     }
 };

src/cli/list_colors.zig

@@ -0,0 +1,32 @@
+const std = @import("std");
+const inputpkg = @import("../input.zig");
+const args = @import("args.zig");
+const RGBName = @import("rgb_names").RGBName;
+
+pub const Options = struct {
+    pub fn deinit(self: Options) void {
+        _ = self;
+    }
+};
+
+/// The "list-colors" command is used to list all the named RGB colors in
+/// Ghostty.
+pub fn run(alloc: std.mem.Allocator) !u8 {
+    var opts: Options = .{};
+    defer opts.deinit();
+
+    {
+        var iter = try std.process.argsWithAllocator(alloc);
+        defer iter.deinit();
+        try args.parse(Options, alloc, &opts, &iter);
+    }
+
+    const stdout = std.io.getStdOut().writer();
+
+    inline for (std.meta.fields(RGBName)) |f| {
+        const rgb = @field(RGBName, f.name).toRGB();
+        try stdout.print("{s} = #{x:0>2}{x:0>2}{x:0>2}\n", .{ f.name, rgb.r, rgb.g, rgb.b });
+    }
+
+    return 0;
+}