'wdcli backup': Move to separate package

internal/backup/context.go

@@ -0,0 +1,98 @@
+package backup
+
+import (
+	"errors"
+	"io"
+	"io/fs"
+	"os"
+	"path/filepath"
+
+	"github.com/FAU-CDI/wisski-distillery/pkg/fsx"
+	"github.com/tkw1536/goprogram/stream"
+)
+
+// context implements [components.BackupContext]
+type context struct {
+	io    stream.IOStream
+	dst   string      // destination directory
+	files chan string // files channel
+}
+
+func (bc *context) sendPath(path string) {
+
+	// resolve the path, or bail out!
+	// TODO: Use the relative path here!
+	dst, err := bc.resolve(path)
+	if err != nil {
+		return
+	}
+
+	bc.files <- dst
+}
+
+func (bc *context) IO() stream.IOStream {
+	return bc.io
+}
+
+var errResolveAbsolute = errors.New("resolve: path must be relative")
+
+func (bc *context) resolve(path string) (dest string, err error) {
+	if path == "" {
+		return bc.dst, nil
+	}
+	if filepath.IsAbs(path) {
+		return "", errResolveAbsolute
+	}
+	return filepath.Join(bc.dst, path), nil
+}
+
+func (bc *context) AddDirectory(path string, op func() error) error {
+	// resolve the path!
+	dst, err := bc.resolve(path)
+	if err != nil {
+		return err
+	}
+
+	// run the make directory
+	if err := os.Mkdir(dst, fs.ModeDir); err != nil {
+		return err
+	}
+
+	// tell the files that we are creating it!
+	bc.sendPath(path)
+
+	// and run the files!
+	// TODO: Add to manifest of some sort
+	return op()
+}
+
+func (bc *context) CopyFile(dst, src string) error {
+	dstPath, err := bc.resolve(dst)
+	if err != nil {
+		return err
+	}
+	bc.sendPath(dst)
+	return fsx.CopyFile(dstPath, src)
+}
+
+func (bc *context) AddFile(path string, op func(file io.Writer) error) error {
+	// resolve the path!
+	dst, err := bc.resolve(path)
+	if err != nil {
+		return err
+	}
+
+	// create the file
+	file, err := os.Create(dst)
+	if err != nil {
+		return err
+	}
+	defer file.Close()
+
+	// tell them that we are creating it!
+	bc.sendPath(path)
+
+	// and do whatever they wanted to do
+	// TODO: Add to the manifest of some sort
+	return op(file)
+}