bisync: implementation #5164

Fixes #118

Co-authored-by: Chris Nelson <stuff@cjnaz.com>

cmd/bisync/bilib/canonical.go

@@ -0,0 +1,42 @@
+// Package bilib provides common stuff for bisync and bisync_test
+package bilib
+
+import (
+	"os"
+	"regexp"
+	"runtime"
+	"strings"
+
+	"github.com/rclone/rclone/fs"
+)
+
+// FsPath converts Fs to a suitable rclone argument
+func FsPath(f fs.Fs) string {
+	name, path, slash := f.Name(), f.Root(), "/"
+	if name == "local" {
+		slash = string(os.PathSeparator)
+		if runtime.GOOS == "windows" {
+			path = strings.ReplaceAll(path, "/", slash)
+			path = strings.TrimPrefix(path, `\\?\`)
+		}
+	} else {
+		path = name + ":" + path
+	}
+	if !strings.HasSuffix(path, slash) {
+		path += slash
+	}
+	return path
+}
+
+// CanonicalPath converts a remote to a suitable base file name
+func CanonicalPath(remote string) string {
+	trimmed := strings.Trim(remote, `\/`)
+	return nonCanonicalChars.ReplaceAllString(trimmed, "_")
+}
+
+var nonCanonicalChars = regexp.MustCompile(`[\s\\/:?*]`)
+
+// SessionName makes a unique base name for the sync operation
+func SessionName(fs1, fs2 fs.Fs) string {
+	return CanonicalPath(FsPath(fs1)) + ".." + CanonicalPath(FsPath(fs2))
+}