Allow a custom location for the filters file

You can now add a key 'filters' in the preferences file that points to the
path of the filters file.  If this key is not found in the preferences,
the default location '.duplicacy/filters' is used.

There is a new option '-filters' for the set command that set this key in
the preferences, but you can also edit the file directly.

src/duplicacy_backupmanager.go

@@ -35,6 +35,7 @@ type BackupManager struct {
 	config *Config // contains a number of options
 
 	nobackupFile string // don't backup directory when this file name is found
+	filtersFile string  // the path to the filters file
 }
 
 func (manager *BackupManager) SetDryRun(dryRun bool) {
@@ -44,7 +45,7 @@ func (manager *BackupManager) SetDryRun(dryRun bool) {
 // CreateBackupManager creates a backup manager using the specified 'storage'.  'snapshotID' is a unique id to
 // identify snapshots created for this repository.  'top' is the top directory of the repository.  'password' is the
 // master key which can be nil if encryption is not enabled.
-func CreateBackupManager(snapshotID string, storage Storage, top string, password string, nobackupFile string) *BackupManager {
+func CreateBackupManager(snapshotID string, storage Storage, top string, password string, nobackupFile string, filtersFile string) *BackupManager {
 
 	config, _, err := DownloadConfig(storage, password)
 	if err != nil {
@@ -67,6 +68,7 @@ func CreateBackupManager(snapshotID string, storage Storage, top string, passwor
 		config: config,
 
 		nobackupFile: nobackupFile,
+		filtersFile: filtersFile,
 	}
 
 	if IsDebugging() {
@@ -198,7 +200,8 @@ func (manager *BackupManager) Backup(top string, quickMode bool, threads int, ta
 	defer DeleteShadowCopy()
 
 	LOG_INFO("BACKUP_INDEXING", "Indexing %s", top)
-	localSnapshot, skippedDirectories, skippedFiles, err := CreateSnapshotFromDirectory(manager.snapshotID, shadowTop, manager.nobackupFile)
+	localSnapshot, skippedDirectories, skippedFiles, err := CreateSnapshotFromDirectory(manager.snapshotID, shadowTop,
+		                                                                                manager.nobackupFile, manager.filtersFile)
 	if err != nil {
 		LOG_ERROR("SNAPSHOT_LIST", "Failed to list the directory %s: %v", top, err)
 		return false
@@ -770,7 +773,8 @@ func (manager *BackupManager) Restore(top string, revision int, inPlace bool, qu
 	remoteSnapshot := manager.SnapshotManager.DownloadSnapshot(manager.snapshotID, revision)
 	manager.SnapshotManager.DownloadSnapshotContents(remoteSnapshot, patterns, true)
 
-	localSnapshot, _, _, err := CreateSnapshotFromDirectory(manager.snapshotID, top, manager.nobackupFile)
+	localSnapshot, _, _, err := CreateSnapshotFromDirectory(manager.snapshotID, top, manager.nobackupFile,
+		                                                    manager.filtersFile)
 	if err != nil {
 		LOG_ERROR("SNAPSHOT_LIST", "Failed to list the repository: %v", err)
 		return false

src/duplicacy_backupmanager_test.go

@@ -239,7 +239,7 @@ func TestBackupManager(t *testing.T) {
 	time.Sleep(time.Duration(delay) * time.Second)
 
 	SetDuplicacyPreferencePath(testDir + "/repository1/.duplicacy")
-	backupManager := CreateBackupManager("host1", storage, testDir, password, "")
+	backupManager := CreateBackupManager("host1", storage, testDir, password, "", "")
 	backupManager.SetupSnapshotCache("default")
 
 	SetDuplicacyPreferencePath(testDir + "/repository1/.duplicacy")

src/duplicacy_preference.go

@@ -25,6 +25,7 @@ type Preference struct {
 	DoNotSavePassword bool              `json:"no_save_password"`
 	NobackupFile      string            `json:"nobackup_file"`
 	Keys              map[string]string `json:"keys"`
+	FiltersFile           string        `json:"filters"`
 }
 
 var preferencePath string

src/duplicacy_snapshot.go

@@ -58,7 +58,7 @@ func CreateEmptySnapshot(id string) (snapshto *Snapshot) {
 
 // CreateSnapshotFromDirectory creates a snapshot from the local directory 'top'.  Only 'Files'
 // will be constructed, while 'ChunkHashes' and 'ChunkLengths' can only be populated after uploading.
-func CreateSnapshotFromDirectory(id string, top string, nobackupFile string) (snapshot *Snapshot, skippedDirectories []string,
+func CreateSnapshotFromDirectory(id string, top string, nobackupFile string, filtersFile string) (snapshot *Snapshot, skippedDirectories []string,
 	skippedFiles []string, err error) {
 
 	snapshot = &Snapshot{
@@ -69,7 +69,10 @@ func CreateSnapshotFromDirectory(id string, top string, nobackupFile string) (sn
 
 	var patterns []string
 
-	patterns = ProcessFilters()
+	if filtersFile == "" {
+		filtersFile = joinPath(GetDuplicacyPreferencePath(), "filters")
+	}
+	patterns = ProcessFilters(filtersFile)
 
 	directories := make([]*Entry, 0, 256)
 	directories = append(directories, CreateEntry("", 0, 0, 0))
@@ -121,8 +124,8 @@ func AppendPattern(patterns []string, new_pattern string) (new_patterns []string
 	new_patterns = append(patterns, new_pattern)
 	return new_patterns
 }
-func ProcessFilters() (patterns []string) {
-	patterns = ProcessFilterFile(joinPath(GetDuplicacyPreferencePath(), "filters"), make([]string, 0))
+func ProcessFilters(filtersFile string) (patterns []string) {
+	patterns = ProcessFilterFile(filtersFile, make([]string, 0))
 
 	LOG_DEBUG("REGEX_DEBUG", "There are %d compiled regular expressions stored", len(RegexMap))
 

src/duplicacy_snapshotmanager.go

@@ -1299,7 +1299,7 @@ func (manager *SnapshotManager) PrintFile(snapshotID string, revision int, path
 
 // Diff compares two snapshots, or two revision of a file if the file argument is given.
 func (manager *SnapshotManager) Diff(top string, snapshotID string, revisions []int,
-	filePath string, compareByHash bool, nobackupFile string) bool {
+	filePath string, compareByHash bool, nobackupFile string, filtersFile string) bool {
 
 	LOG_DEBUG("DIFF_PARAMETERS", "top: %s, id: %s, revision: %v, path: %s, compareByHash: %t",
 		top, snapshotID, revisions, filePath, compareByHash)
@@ -1312,7 +1312,7 @@ func (manager *SnapshotManager) Diff(top string, snapshotID string, revisions []
 	if len(revisions) <= 1 {
 		// Only scan the repository if filePath is not provided
 		if len(filePath) == 0 {
-			rightSnapshot, _, _, err = CreateSnapshotFromDirectory(snapshotID, top, nobackupFile)
+			rightSnapshot, _, _, err = CreateSnapshotFromDirectory(snapshotID, top, nobackupFile, filtersFile)
 			if err != nil {
 				LOG_ERROR("SNAPSHOT_LIST", "Failed to list the directory %s: %v", top, err)
 				return false