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package git
/*
#cgo pkg-config: libgit2
#include <git2.h>
#include <git2/errors.h>
#include <git2/pack.h>
#include <stdlib.h>
extern int _go_git_packbuilder_foreach(git_packbuilder *pb, void *payload);
*/
import "C"
import (
"io"
"os"
"runtime"
"unsafe"
)
type Packbuilder struct {
ptr *C.git_packbuilder
}
func (repo *Repository) NewPackbuilder() (*Packbuilder, error) {
builder := &Packbuilder{}
ret := C.git_packbuilder_new(&builder.ptr, repo.ptr)
if ret != 0 {
return nil, LastError()
}
runtime.SetFinalizer(builder, (*Packbuilder).Free)
return builder, nil
}
func (pb *Packbuilder) Free() {
runtime.SetFinalizer(pb, nil)
C.git_packbuilder_free(pb.ptr)
}
func (pb *Packbuilder) Insert(id *Oid, name string) error {
cname := C.CString(name)
defer C.free(unsafe.Pointer(cname))
ret := C.git_packbuilder_insert(pb.ptr, id.toC(), cname)
if ret != 0 {
return LastError()
}
return nil
}
func (pb *Packbuilder) InsertCommit(id *Oid) error {
ret := C.git_packbuilder_insert_commit(pb.ptr, id.toC())
if ret != 0 {
return LastError()
}
return nil
}
func (pb *Packbuilder) InsertTree(id *Oid) error {
ret := C.git_packbuilder_insert_tree(pb.ptr, id.toC())
if ret != 0 {
return LastError()
}
return nil
}
func (pb *Packbuilder) ObjectCount() uint32 {
return uint32(C.git_packbuilder_object_count(pb.ptr))
}
func (pb *Packbuilder) WriteToFile(name string, mode os.FileMode) error {
cname := C.CString(name)
defer C.free(unsafe.Pointer(cname))
ret := C.git_packbuilder_write(pb.ptr, cname, C.uint(mode.Perm()), nil, nil)
if ret != 0 {
return LastError()
}
return nil
}
func (pb *Packbuilder) Write(w io.Writer) error {
ch, stop := pb.ForEach()
for slice := range ch {
_, err := w.Write(slice)
if err != nil {
close(stop)
return err
}
}
return nil
}
func (pb *Packbuilder) Written() uint32 {
return uint32(C.git_packbuilder_written(pb.ptr))
}
type packbuilderCbData struct {
ch chan<- []byte
stop <-chan bool
}
//export packbuilderForEachCb
func packbuilderForEachCb(buf unsafe.Pointer, size C.size_t, payload unsafe.Pointer) int {
data := (*packbuilderCbData)(payload)
ch := data.ch
stop := data.stop
slice := C.GoBytes(buf, C.int(size))
select {
case <- stop:
return -1
case ch <- slice:
}
return 0
}
func (pb *Packbuilder) forEachWrap(data *packbuilderCbData) {
C._go_git_packbuilder_foreach(pb.ptr, unsafe.Pointer(data))
close(data.ch)
}
// Foreach sends the packfile as slices through the "data" channel. If
// you want to stop the pack-building process (e.g. there's an error
// writing to the output), close or write a value into the "stop"
// channel.
func (pb *Packbuilder) ForEach() (<-chan []byte, chan<- bool) {
ch := make(chan []byte)
stop := make(chan bool)
data := packbuilderCbData{ch, stop}
go pb.forEachWrap(&data)
return ch, stop
}
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