Add harfbuzz build (not used yet)

.gitmodules

@@ -22,3 +22,6 @@
 [submodule "vendor/utf8proc"]
 	path = vendor/utf8proc
 	url = https://github.com/JuliaStrings/utf8proc.git
+[submodule "vendor/harfbuzz"]
+	path = vendor/harfbuzz
+	url = https://github.com/harfbuzz/harfbuzz.git

build.zig

@@ -4,6 +4,7 @@ const Builder = std.build.Builder;
 const LibExeObjStep = std.build.LibExeObjStep;
 const glfw = @import("vendor/mach/glfw/build.zig");
 const freetype = @import("pkg/freetype/build.zig");
+const harfbuzz = @import("pkg/harfbuzz/build.zig");
 const libuv = @import("pkg/libuv/build.zig");
 const libpng = @import("pkg/libpng/build.zig");
 const utf8proc = @import("pkg/utf8proc/build.zig");
@@ -156,6 +157,7 @@ fn addDeps(
 ) !void {
     // We always need the Zig packages
     step.addPackage(freetype.pkg);
+    step.addPackage(harfbuzz.pkg);
     step.addPackage(glfw.pkg);
     step.addPackage(libuv.pkg);
     step.addPackage(utf8proc.pkg);
@@ -185,6 +187,7 @@ fn addDeps(
         step.addIncludePath(freetype.include_path_self);
         step.linkSystemLibrary("bzip2");
         step.linkSystemLibrary("freetype2");
+        step.linkSystemLibrary("harfbuzz");
         step.linkSystemLibrary("libpng");
         step.linkSystemLibrary("libuv");
         step.linkSystemLibrary("zlib");
@@ -201,7 +204,7 @@ fn addDeps(
         });
 
         // Freetype
-        _ = try freetype.link(b, step, .{
+        const freetype_step = try freetype.link(b, step, .{
             .libpng = freetype.Options.Libpng{
                 .enabled = true,
                 .step = libpng_step,
@@ -215,8 +218,17 @@ fn addDeps(
             },
         });
 
+        // Harfbuzz
+        _ = try harfbuzz.link(b, step, .{
+            .freetype = .{
+                .enabled = true,
+                .step = freetype_step,
+                .include = &freetype.include_paths,
+            },
+        });
+
         // Libuv
-        var libuv_step = try libuv.link(b, step);
+        const libuv_step = try libuv.link(b, step);
         system_sdk.include(b, libuv_step, .{});
     }
 }

nix/devshell.nix

@@ -17,6 +17,7 @@
 , bzip2
 , fontconfig
 , freetype
+, harfbuzz
 , libpng
 , libGL
 , libuv
@@ -35,6 +36,7 @@ let
   ] ++ lib.optionals stdenv.isLinux [
     bzip2
     freetype
+    harfbuzz
     libpng
     libuv
     zlib
@@ -71,6 +73,7 @@ in mkShell rec {
   ] ++ lib.optionals stdenv.isLinux [
     bzip2
     freetype
+    harfbuzz
     libpng
     libuv
     zlib

pkg/freetype/build.zig

@@ -5,6 +5,8 @@ const root = thisDir() ++ "../../../vendor/freetype/";
 const include_path = root ++ "include";
 pub const include_path_self = thisDir();
 
+pub const include_paths = .{ include_path, include_path_self };
+
 pub const pkg = std.build.Pkg{
     .name = "freetype",
     .source = .{ .path = thisDir() ++ "/main.zig" },

pkg/harfbuzz/build.zig

@@ -0,0 +1,94 @@
+const std = @import("std");
+
+/// Directories with our includes.
+const root = thisDir() ++ "../../../vendor/harfbuzz/";
+const include_path = root ++ "include";
+
+pub const include_paths = .{include_path};
+
+pub const pkg = std.build.Pkg{
+    .name = "harfbuzz",
+    .source = .{ .path = thisDir() ++ "/main.zig" },
+};
+
+fn thisDir() []const u8 {
+    return std.fs.path.dirname(@src().file) orelse ".";
+}
+
+pub const Options = struct {
+    freetype: Freetype = .{},
+
+    pub const Freetype = struct {
+        enabled: bool = false,
+        step: ?*std.build.LibExeObjStep = null,
+        include: ?[]const []const u8 = null,
+    };
+};
+
+pub fn link(
+    b: *std.build.Builder,
+    step: *std.build.LibExeObjStep,
+    opt: Options,
+) !*std.build.LibExeObjStep {
+    const lib = try buildHarfbuzz(b, step, opt);
+    step.linkLibrary(lib);
+    step.addIncludePath(include_path);
+    return lib;
+}
+
+pub fn buildHarfbuzz(
+    b: *std.build.Builder,
+    step: *std.build.LibExeObjStep,
+    opt: Options,
+) !*std.build.LibExeObjStep {
+    const lib = b.addStaticLibrary("harfbuzz", null);
+    lib.setTarget(step.target);
+    lib.setBuildMode(step.build_mode);
+
+    // Include
+    lib.addIncludePath(include_path);
+
+    // Link
+    lib.linkLibC();
+    lib.linkLibCpp();
+    if (opt.freetype.enabled) {
+        if (opt.freetype.step) |freetype|
+            lib.linkLibrary(freetype)
+        else
+            lib.linkSystemLibrary("freetype2");
+
+        if (opt.freetype.include) |dirs|
+            for (dirs) |dir| lib.addIncludePath(dir);
+    }
+
+    // Compile
+    var flags = std.ArrayList([]const u8).init(b.allocator);
+    defer flags.deinit();
+
+    try flags.appendSlice(&.{
+        "-DHAVE_UNISTD_H",
+        "-DHAVE_SYS_MMAN_H",
+        "-DHAVE_STDBOOL_H",
+
+        // We always have pthread
+        "-DHAVE_PTHREAD=1",
+    });
+    if (opt.freetype.enabled) try flags.appendSlice(&.{
+        "-DHAVE_FREETYPE=1",
+
+        // Let's just assume a new freetype
+        "-DHAVE_FT_GET_VAR_BLEND_COORDINATES=1",
+        "-DHAVE_FT_SET_VAR_BLEND_COORDINATES=1",
+        "-DHAVE_FT_DONE_MM_VAR=1",
+        "-DHAVE_FT_GET_TRANSFORM=1",
+    });
+
+    // C files
+    lib.addCSourceFiles(srcs, flags.items);
+
+    return lib;
+}
+
+const srcs = &.{
+    root ++ "src/harfbuzz.cc",
+};

pkg/harfbuzz/main.zig

@@ -0,0 +1 @@
+// Todo!

vendor/harfbuzz

@@ -0,0 +1 @@
+Subproject commit 9e4ae09fe76e0ab908095940c880b4ded94c1e18