From bab0697f0e8a98cfa28c7527ee616e954c7afe91 Mon Sep 17 00:00:00 2001
From: Laria Carolin Chabowski <laria@laria.me>
Date: Tue, 8 Aug 2017 08:05:52 +0200
Subject: Add OpenWritable to fs interfaces

---
 fs/fs.go     |  3 ++-
 fs/memory.go |  6 +++++-
 fs/os.go     | 10 +++++++++-
 3 files changed, 16 insertions(+), 3 deletions(-)

(limited to 'fs')

diff --git a/fs/fs.go b/fs/fs.go
index b06ded8..d6d0618 100644
--- a/fs/fs.go
+++ b/fs/fs.go
@@ -23,7 +23,8 @@ type File interface {
 
 type RegularFile interface {
 	File
-	Open() (io.ReadWriteCloser, error)
+	Open() (io.ReadCloser, error)
+	OpenWritable() (io.WriteCloser, error)
 }
 
 type Dir interface {
diff --git a/fs/memory.go b/fs/memory.go
index 221ff36..2bc11dc 100644
--- a/fs/memory.go
+++ b/fs/memory.go
@@ -40,7 +40,11 @@ type memfsFile struct {
 
 func (memfsFile) Type() FileType { return FFile }
 
-func (f memfsFile) Open() (io.ReadWriteCloser, error) {
+func (f memfsFile) Open() (io.ReadCloser, error) {
+	return f, nil
+}
+
+func (f memfsFile) OpenWritable() (io.WriteCloser, error) {
 	return f, nil
 }
 
diff --git a/fs/os.go b/fs/os.go
index f41d111..166cf92 100644
--- a/fs/os.go
+++ b/fs/os.go
@@ -58,7 +58,7 @@ func (f osFile) Delete() error {
 	return os.RemoveAll(f.fullpath)
 }
 
-func (f osFile) Open() (io.ReadWriteCloser, error) {
+func (f osFile) Open() (io.ReadCloser, error) {
 	fh, err := os.Open(f.fullpath)
 	if err != nil {
 		return nil, err
@@ -66,6 +66,14 @@ func (f osFile) Open() (io.ReadWriteCloser, error) {
 	return fh, nil
 }
 
+func (f osFile) OpenWritable() (io.WriteCloser, error) {
+	fh, err := os.Create(f.fullpath)
+	if err != nil {
+		return nil, err
+	}
+	return fh, nil
+}
+
 func (f osFile) Readdir() (list []File, err error) {
 	fh, err := os.Open(f.fullpath)
 	if err != nil {
-- 
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