Add iexclude option to backup command

cmd/restic/cmd_backup.go

@@ -68,20 +68,21 @@ given as the arguments.
 
 // BackupOptions bundles all options for the backup command.
 type BackupOptions struct {
-	Parent           string
-	Force            bool
-	Excludes         []string
-	ExcludeFiles     []string
-	ExcludeOtherFS   bool
-	ExcludeIfPresent []string
-	ExcludeCaches    bool
-	Stdin            bool
-	StdinFilename    string
-	Tags             []string
-	Host             string
-	FilesFrom        []string
-	TimeStamp        string
-	WithAtime        bool
+	Parent              string
+	Force               bool
+	Excludes            []string
+	InsensitiveExcludes []string
+	ExcludeFiles        []string
+	ExcludeOtherFS      bool
+	ExcludeIfPresent    []string
+	ExcludeCaches       bool
+	Stdin               bool
+	StdinFilename       string
+	Tags                []string
+	Host                string
+	FilesFrom           []string
+	TimeStamp           string
+	WithAtime           bool
 }
 
 var backupOptions BackupOptions
@@ -93,6 +94,7 @@ func init() {
 	f.StringVar(&backupOptions.Parent, "parent", "", "use this parent snapshot (default: last snapshot in the repo that has the same target files/directories)")
 	f.BoolVarP(&backupOptions.Force, "force", "f", false, `force re-reading the target files/directories (overrides the "parent" flag)`)
 	f.StringArrayVarP(&backupOptions.Excludes, "exclude", "e", nil, "exclude a `pattern` (can be specified multiple times)")
+	f.StringArrayVar(&backupOptions.InsensitiveExcludes, "iexclude", nil, "same as `--exclude` but ignores the casing of filenames")
 	f.StringArrayVar(&backupOptions.ExcludeFiles, "exclude-file", nil, "read exclude patterns from a `file` (can be specified multiple times)")
 	f.BoolVarP(&backupOptions.ExcludeOtherFS, "one-file-system", "x", false, "exclude other file systems")
 	f.StringArrayVar(&backupOptions.ExcludeIfPresent, "exclude-if-present", nil, "takes filename[:header], exclude contents of directories containing filename (except filename itself) if header of that file is as provided (can be specified multiple times)")
@@ -222,6 +224,10 @@ func collectRejectByNameFuncs(opts BackupOptions, repo *repository.Repository, t
 		opts.Excludes = append(opts.Excludes, excludes...)
 	}
 
+	if len(opts.InsensitiveExcludes) > 0 {
+		fs = append(fs, rejectByInsensitivePattern(opts.InsensitiveExcludes))
+	}
+
 	if len(opts.Excludes) > 0 {
 		fs = append(fs, rejectByPattern(opts.Excludes))
 	}

cmd/restic/exclude.go

@@ -88,6 +88,16 @@ func rejectByPattern(patterns []string) RejectByNameFunc {
 	}
 }
 
+// Same as `rejectByPattern` but case insensitive.
+func rejectByInsensitivePattern(patterns []string) RejectByNameFunc {
+	for index, path := range patterns {
+		patterns[index] = strings.ToLower(path)
+	}
+	return func(item string) bool {
+		return rejectByPattern(patterns)(strings.ToLower(item))
+	}
+}
+
 // rejectIfPresent returns a RejectByNameFunc which itself returns whether a path
 // should be excluded. The RejectByNameFunc considers a file to be excluded when
 // it resides in a directory with an exclusion file, that is specified by