From 5b215409c65aa774d386c448db3407db17b4c208 Mon Sep 17 00:00:00 2001
From: Mitchell Hashimoto <mitchell.hashimoto@gmail.com>
Date: Fri, 16 Sep 2022 09:55:45 -0700
Subject: [PATCH] pkg/fontconfig: pattern.add

---
 pkg/fontconfig/object_set.zig |  2 +-
 pkg/fontconfig/pattern.zig    | 18 ++++++++++++++++--
 pkg/fontconfig/value.zig      | 21 ++++++++++++++++++++-
 3 files changed, 37 insertions(+), 4 deletions(-)

diff --git a/pkg/fontconfig/object_set.zig b/pkg/fontconfig/object_set.zig
index 7d13121a8..57db92bc9 100644
--- a/pkg/fontconfig/object_set.zig
+++ b/pkg/fontconfig/object_set.zig
@@ -74,7 +74,7 @@ pub const Property = enum {
     font_has_hint,
     order,
 
-    fn cval(self: Property) [:0]const u8 {
+    pub fn cval(self: Property) [:0]const u8 {
         @setEvalBranchQuota(10_000);
         inline for (@typeInfo(Property).Enum.fields) |field| {
             if (self == @field(Property, field.name)) {
diff --git a/pkg/fontconfig/pattern.zig b/pkg/fontconfig/pattern.zig
index cee9c708f..678e9be7c 100644
--- a/pkg/fontconfig/pattern.zig
+++ b/pkg/fontconfig/pattern.zig
@@ -2,6 +2,7 @@ const std = @import("std");
 const assert = std.debug.assert;
 const c = @import("c.zig");
 const ObjectSet = @import("main.zig").ObjectSet;
+const Property = @import("main.zig").Property;
 const Result = @import("main.zig").Result;
 const Value = @import("main.zig").Value;
 const ValueBinding = @import("main.zig").ValueBinding;
@@ -23,8 +24,17 @@ pub const Pattern = opaque {
         c.FcDefaultSubstitute(self.cval());
     }
 
-    pub fn delete(self: *Pattern, obj: [:0]const u8) bool {
-        return c.FcPatternDel(self.cval(), obj.ptr) == c.FcTrue;
+    pub fn add(self: *Pattern, prop: Property, value: Value, append: bool) bool {
+        return c.FcPatternAdd(
+            self.cval(),
+            prop.cval(),
+            value.cval(),
+            if (append) c.FcTrue else c.FcFalse,
+        ) == c.FcTrue;
+    }
+
+    pub fn delete(self: *Pattern, prop: Property) bool {
+        return c.FcPatternDel(self.cval(), prop.cval()) == c.FcTrue;
     }
 
     pub fn filter(self: *Pattern, os: *const ObjectSet) *Pattern {
@@ -124,8 +134,12 @@ pub const Pattern = opaque {
 };
 
 test "create" {
+    const testing = std.testing;
+
     var pat = Pattern.create();
     defer pat.destroy();
+
+    try testing.expect(pat.add(.family, .{ .string = "monospace" }, false));
 }
 
 test "name parse" {
diff --git a/pkg/fontconfig/value.zig b/pkg/fontconfig/value.zig
index 4103c7528..fd5ae7444 100644
--- a/pkg/fontconfig/value.zig
+++ b/pkg/fontconfig/value.zig
@@ -25,7 +25,7 @@ pub const Value = union(Type) {
     @"void": void,
     integer: u32,
     double: f64,
-    string: []const u8,
+    string: [:0]const u8,
     @"bool": bool,
     matrix: *const Matrix,
     char_set: *const CharSet,
@@ -48,6 +48,25 @@ pub const Value = union(Type) {
             .range => .{ .range = @ptrCast(*const Range, cvalue.u.r) },
         };
     }
+
+    pub fn cval(self: Value) c.struct__FcValue {
+        return .{
+            .@"type" = @enumToInt(std.meta.activeTag(self)),
+            .u = switch (self) {
+                .unknown => undefined,
+                .@"void" => undefined,
+                .integer => |v| .{ .i = @intCast(c_int, v) },
+                .double => |v| .{ .d = v },
+                .string => |v| .{ .s = v },
+                .@"bool" => |v| .{ .b = if (v) c.FcTrue else c.FcFalse },
+                .matrix => |v| .{ .m = @ptrCast(*const c.struct__FcMatrix, v) },
+                .char_set => |v| .{ .c = @ptrCast(*const c.struct__FcCharSet, v) },
+                .ft_face => |v| .{ .f = v },
+                .lang_set => |v| .{ .l = @ptrCast(*const c.struct__FcLangSet, v) },
+                .range => |v| .{ .r = @ptrCast(*const c.struct__FcRange, v) },
+            },
+        };
+    }
 };
 
 pub const ValueBinding = enum(c_int) {