Mark some symbols to be deprecated #minor (#698)

This change introduces the file deprecated.go, which contains any
constants, functions, and types that are slated to be deprecated in the
next major release.

These symbols are deprecated because they refer to old spellings in
pre-1.0 libgit2. This also makes the build be done with the
`-DDEPRECATE_HARD` flag to avoid regressions.

This, together with
[gorelease](https://godoc.org/golang.org/x/exp/cmd/gorelease)[1] should
make releases safer going forward.

1: More information about how that works at
   https://go.googlesource.com/exp/+/refs/heads/master/apidiff/README.md

1 files changed, 3 insertions, 30 deletions

diff --git a/blob.go b/blob.go
index e8296bb..091ced1 100644
--- a/blob.go
+++ b/blob.go
@@ -9,7 +9,6 @@ void _go_git_writestream_free(git_writestream *stream);
 */
 import "C"
 import (
-	"io"
 	"reflect"
 	"runtime"
 	"unsafe"
@@ -68,7 +67,7 @@ func (repo *Repository) CreateBlobFromBuffer(data []byte) (*Oid, error) {
 		size = C.size_t(0)
 	}
 
-	ecode := C.git_blob_create_frombuffer(&id, repo.ptr, unsafe.Pointer(&data[0]), size)
+	ecode := C.git_blob_create_from_buffer(&id, repo.ptr, unsafe.Pointer(&data[0]), size)
 	runtime.KeepAlive(repo)
 	if ecode < 0 {
 		return nil, MakeGitError(ecode)
@@ -76,32 +75,6 @@ func (repo *Repository) CreateBlobFromBuffer(data []byte) (*Oid, error) {
 	return newOidFromC(&id), nil
 }
 
-type BlobChunkCallback func(maxLen int) ([]byte, error)
-
-type BlobCallbackData struct {
-	Callback BlobChunkCallback
-	Error    error
-}
-
-//export blobChunkCb
-func blobChunkCb(buffer *C.char, maxLen C.size_t, handle unsafe.Pointer) int {
-	payload := pointerHandles.Get(handle)
-	data, ok := payload.(*BlobCallbackData)
-	if !ok {
-		panic("could not retrieve blob callback data")
-	}
-
-	goBuf, err := data.Callback(int(maxLen))
-	if err == io.EOF {
-		return 0
-	} else if err != nil {
-		data.Error = err
-		return -1
-	}
-	C.memcpy(unsafe.Pointer(buffer), unsafe.Pointer(&goBuf[0]), C.size_t(len(goBuf)))
-	return len(goBuf)
-}
-
 func (repo *Repository) CreateFromStream(hintPath string) (*BlobWriteStream, error) {
 	var chintPath *C.char = nil
 	var stream *C.git_writestream
@@ -114,7 +87,7 @@ func (repo *Repository) CreateFromStream(hintPath string) (*BlobWriteStream, err
 	runtime.LockOSThread()
 	defer runtime.UnlockOSThread()
 
-	ecode := C.git_blob_create_fromstream(&stream, repo.ptr, chintPath)
+	ecode := C.git_blob_create_from_stream(&stream, repo.ptr, chintPath)
 	if ecode < 0 {
 		return nil, MakeGitError(ecode)
 	}
@@ -166,7 +139,7 @@ func (stream *BlobWriteStream) Commit() (*Oid, error) {
 	runtime.LockOSThread()
 	defer runtime.UnlockOSThread()
 
-	ecode := C.git_blob_create_fromstream_commit(&oid, stream.ptr)
+	ecode := C.git_blob_create_from_stream_commit(&oid, stream.ptr)
 	runtime.KeepAlive(stream)
 	if ecode < 0 {
 		return nil, MakeGitError(ecode)