macOS client store and API

mac/palette/main.go

@@ -0,0 +1,95 @@
+package main
+
+import (
+	"fmt"
+	"log"
+	"os"
+	"regexp"
+	"strings"
+)
+
+var (
+	property = regexp.MustCompile(`^\s*--([a-z0-9-]+):\s*#([0-9a-f]{6});\s*$`)
+	darkOpen = regexp.MustCompile(`^@media \(prefers-color-scheme: dark\) \{$`)
+)
+
+func block(lines []string, start int) (map[string]string, []string) {
+	colors := map[string]string{}
+	order := []string{}
+	for _, line := range lines[start+1:] {
+		if strings.TrimSpace(line) == "}" {
+			return colors, order
+		}
+		m := property.FindStringSubmatch(line)
+		if m == nil {
+			continue
+		}
+		colors[m[1]] = m[2]
+		order = append(order, m[1])
+	}
+	log.Fatalf("unterminated block at line %d", start+1)
+	return nil, nil
+}
+
+func swiftName(prop string) string {
+	parts := strings.Split(prop, "-")
+	for i := 1; i < len(parts); i++ {
+		parts[i] = strings.ToUpper(parts[i][:1]) + parts[i][1:]
+	}
+	return strings.Join(parts, "")
+}
+
+func main() {
+	css, err := os.ReadFile("../web/style.css")
+	if err != nil {
+		log.Fatal(err)
+	}
+	lines := strings.Split(string(css), "\n")
+	lightAt, darkAt := -1, -1
+	for i, line := range lines {
+		if line == ":root {" && lightAt < 0 {
+			lightAt = i
+		}
+		if darkOpen.MatchString(line) && i+1 < len(lines) && strings.TrimSpace(lines[i+1]) == ":root {" {
+			darkAt = i + 1
+		}
+	}
+	if lightAt < 0 || darkAt < 0 {
+		log.Fatal("web/style.css has no :root block or no prefers-color-scheme: dark :root block")
+	}
+	light, order := block(lines, lightAt)
+	dark, _ := block(lines, darkAt)
+
+	var b strings.Builder
+	b.WriteString("// Code generated by go generate ./mac from web/style.css. DO NOT EDIT.\n\n")
+	b.WriteString("import AppKit\nimport SwiftUI\n\n")
+	b.WriteString("enum Palette {\n")
+	for _, prop := range order {
+		d, ok := dark[prop]
+		if !ok {
+			log.Fatalf("--%s has no dark value", prop)
+		}
+		fmt.Fprintf(&b, "    static let %s = dynamic(0x%s, 0x%s)\n", swiftName(prop), light[prop], d)
+	}
+	for prop := range dark {
+		if _, ok := light[prop]; !ok {
+			log.Fatalf("--%s has no light value", prop)
+		}
+	}
+	b.WriteString(`
+    private static func rgb(_ hex: UInt32) -> NSColor {
+        NSColor(srgbRed: CGFloat(hex >> 16 & 0xff) / 255, green: CGFloat(hex >> 8 & 0xff) / 255, blue: CGFloat(hex & 0xff) / 255, alpha: 1)
+    }
+
+    private static func dynamic(_ light: UInt32, _ dark: UInt32) -> Color {
+        Color(nsColor: NSColor(name: nil) { appearance in
+            appearance.bestMatch(from: [.aqua, .darkAqua]) == .darkAqua ? rgb(dark) : rgb(light)
+        })
+    }
+}
+`)
+	err = os.WriteFile("Sources/Byre/Palette.swift", []byte(b.String()), 0o644)
+	if err != nil {
+		log.Fatal(err)
+	}
+}