chore: migrate mail themes to shared framework and locked upstream inputs

tools/cli/build.go

@@ -0,0 +1,32 @@
+package cli
+
+import (
+	"fmt"
+	"gitea-mail-templates/tools/builder"
+	"gitea-mail-templates/tools/upstream"
+	"github.com/urfave/cli/v2"
+	"path/filepath"
+)
+
+func BuildCommand() *cli.Command {
+	return &cli.Command{Name: "build", Usage: "Generate installable themes from locked official inputs and shared controls", Flags: []cli.Flag{&cli.StringFlag{Name: "folder", Value: "../themes"}}, Action: func(c *cli.Context) error {
+		s, err := upstream.Prepare(c.Context, filepath.Dir(c.String("folder")))
+		if err != nil {
+			return err
+		}
+		filter, err := builder.Filter(c.Args().Slice())
+		if err != nil {
+			return err
+		}
+		packages, err := builder.BuildAll(c.String("folder"), s, filter)
+		if err != nil {
+			return err
+		}
+		output := filepath.Join(filepath.Dir(c.String("folder")), "build", "themes")
+		if err := builder.Write(output, s, packages); err != nil {
+			return err
+		}
+		fmt.Printf("[PASS] Built %d themes for %s at %s\n", len(packages), s.Lock.Tag, output)
+		return nil
+	}}
+}