terminal: don't build StringMap.searchIterator without regex support

src/build/GhosttyZig.zig

@@ -23,7 +23,12 @@ pub fn init(
     deps.unicode_tables.addModuleImport(vt);
     vt_options.addOptions(b, vt, .{
         .artifact = .lib,
+
+        // We presently don't allow Oniguruma in our Zig module at all.
+        // We should expose this as a build option in the future so we can
+        // conditionally do this.
         .oniguruma = false,
+
         .slow_runtime_safety = switch (cfg.optimize) {
             .Debug => true,
             .ReleaseSafe,

src/terminal/StringMap.zig

@@ -3,6 +3,7 @@
 const StringMap = @This();
 
 const std = @import("std");
+const build_options = @import("terminal_options");
 const oni = @import("oniguruma");
 const point = @import("point.zig");
 const Selection = @import("Selection.zig");
@@ -19,7 +20,13 @@ pub fn deinit(self: StringMap, alloc: Allocator) void {
 }
 
 /// Returns an iterator that yields the next match of the given regex.
-pub fn searchIterator(
+/// Requires Ghostty to be compiled with regex support.
+pub const searchIterator = if (build_options.oniguruma)
+    searchIteratorOni
+else
+    void;
+
+fn searchIteratorOni(
     self: StringMap,
     regex: oni.Regex,
 ) SearchIterator {
@@ -85,6 +92,8 @@ pub const Match = struct {
 };
 
 test "StringMap searchIterator" {
+    if (comptime !build_options.oniguruma) return error.SkipZigTest;
+
     const testing = std.testing;
     const alloc = testing.allocator;
 

src/terminal/build_options.zig

@@ -5,7 +5,12 @@ pub const Options = struct {
     artifact: Artifact = .ghostty,
 
     /// Whether Oniguruma regex support is available. If this isn't
-    /// available, some features will be disabled.
+    /// available, some features will be disabled. This may be outdated,
+    /// but the specific disabled features are:
+    ///
+    /// - Kitty graphics protocol
+    /// - Tmux control mode
+    ///
     oniguruma: bool = true,
 
     /// True if we should enable the "slow" runtime safety checks. These