terminal: use LibEnum for the command keys

src/lib/enum.zig

@@ -35,7 +35,8 @@ pub fn Enum(
         fields_i += 1;
     }
 
-    return @Type(.{ .@"enum" = .{
+    // Assigned to var so that the type name is nicer in stack traces.
+    const Result = @Type(.{ .@"enum" = .{
         .tag_type = switch (target) {
             .c => c_int,
             .zig => std.math.IntFittingRange(0, fields_i - 1),
@@ -44,6 +45,7 @@ pub fn Enum(
         .decls = &.{},
         .is_exhaustive = true,
     } });
+    return Result;
 }
 
 pub const Target = union(enum) {

src/terminal/build_options.zig

@@ -1,5 +1,8 @@
 const std = @import("std");
 
+/// True if we're building the C library libghostty-vt.
+pub const is_c_lib = @import("root") == @import("../lib_vt.zig");
+
 pub const Options = struct {
     /// The target artifact to build. This will gate some functionality.
     artifact: Artifact,

src/terminal/main.zig

@@ -63,7 +63,7 @@ pub const Attribute = sgr.Attribute;
 pub const isSafePaste = sanitize.isSafePaste;
 
 /// This is set to true when we're building the C library.
-pub const is_c_lib = @import("root") == @import("../lib_vt.zig");
+pub const is_c_lib = @import("build_options.zig").is_c_lib;
 pub const c_api = @import("c/main.zig");
 
 test {

src/terminal/osc.zig

@@ -10,6 +10,8 @@ const builtin = @import("builtin");
 const mem = std.mem;
 const assert = std.debug.assert;
 const Allocator = mem.Allocator;
+const LibEnum = @import("../lib/enum.zig").Enum;
+const is_c_lib = @import("build_options.zig").is_c_lib;
 const RGB = @import("color.zig").RGB;
 const kitty_color = @import("kitty/color.zig");
 const osc_color = @import("osc/color.zig");
@@ -17,7 +19,7 @@ pub const color = osc_color;
 
 const log = std.log.scoped(.osc);
 
-pub const Command = union(enum) {
+pub const Command = union(Key) {
     /// This generally shouldn't ever be set except as an initial zero value.
     /// Ignore it.
     invalid,
@@ -172,6 +174,34 @@ pub const Command = union(enum) {
     /// ConEmu GUI macro (OSC 9;6)
     conemu_guimacro: []const u8,
 
+    pub const Key = LibEnum(
+        if (is_c_lib) .c else .zig,
+        // NOTE: Order matters, see LibEnum documentation.
+        &.{
+            "invalid",
+            "change_window_title",
+            "change_window_icon",
+            "prompt_start",
+            "prompt_end",
+            "end_of_input",
+            "end_of_command",
+            "clipboard_contents",
+            "report_pwd",
+            "mouse_shape",
+            "color_operation",
+            "kitty_color_protocol",
+            "show_desktop_notification",
+            "hyperlink_start",
+            "hyperlink_end",
+            "conemu_sleep",
+            "conemu_show_message_box",
+            "conemu_change_tab_title",
+            "conemu_progress_report",
+            "conemu_wait_input",
+            "conemu_guimacro",
+        },
+    );
+
     pub const ProgressReport = struct {
         pub const State = enum(c_int) {
             remove,