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package git
/*
#cgo pkg-config: libgit2
#include <git2.h>
#include <git2/errors.h>
*/
import "C"
import (
"bytes"
"encoding/hex"
"errors"
"runtime"
"strings"
"unsafe"
)
const (
ITEROVER = C.GIT_ITEROVER
EEXISTS = C.GIT_EEXISTS
ENOTFOUND = C.GIT_ENOTFOUND
)
var (
ErrIterOver = errors.New("Iteration is over")
)
func init() {
C.git_threads_init()
}
// Oid represents the id for a Git object.
type Oid [20]byte
func newOidFromC(coid *C.git_oid) *Oid {
if coid == nil {
return nil
}
oid := new(Oid)
copy(oid[0:20], C.GoBytes(unsafe.Pointer(coid), 20))
return oid
}
func NewOidFromBytes(b []byte) *Oid {
oid := new(Oid)
copy(oid[0:20], b[0:20])
return oid
}
func (oid *Oid) toC() *C.git_oid {
return (*C.git_oid)(unsafe.Pointer(oid))
}
func NewOid(s string) (*Oid, error) {
if len(s) > C.GIT_OID_HEXSZ {
return nil, errors.New("string is too long for oid")
}
o := new(Oid)
slice, error := hex.DecodeString(s)
if error != nil {
return nil, error
}
copy(o[:], slice[:20])
return o, nil
}
func (oid *Oid) String() string {
return hex.EncodeToString(oid[:])
}
func (oid *Oid) Cmp(oid2 *Oid) int {
return bytes.Compare(oid[:], oid2[:])
}
func (oid *Oid) Copy() *Oid {
ret := new(Oid)
copy(ret[:], oid[:])
return ret
}
func (oid *Oid) Equal(oid2 *Oid) bool {
return bytes.Equal(oid[:], oid2[:])
}
func (oid *Oid) IsZero() bool {
for _, a := range oid {
if a != '0' {
return false
}
}
return true
}
func (oid *Oid) NCmp(oid2 *Oid, n uint) int {
return bytes.Compare(oid[:n], oid2[:n])
}
func ShortenOids(ids []*Oid, minlen int) (int, error) {
shorten := C.git_oid_shorten_new(C.size_t(minlen))
if shorten == nil {
panic("Out of memory")
}
defer C.git_oid_shorten_free(shorten)
var ret C.int
runtime.LockOSThread()
defer runtime.UnlockOSThread()
for _, id := range ids {
buf := make([]byte, 41)
C.git_oid_fmt((*C.char)(unsafe.Pointer(&buf[0])), id.toC())
buf[40] = 0
ret = C.git_oid_shorten_add(shorten, (*C.char)(unsafe.Pointer(&buf[0])))
if ret < 0 {
return int(ret), MakeGitError(ret)
}
}
return int(ret), nil
}
type GitError struct {
Message string
Class int
ErrorCode int
}
func (e GitError) Error() string {
return e.Message
}
func IsNotExist(err error) bool {
return err.(*GitError).ErrorCode == C.GIT_ENOTFOUND
}
func IsExist(err error) bool {
return err.(*GitError).ErrorCode == C.GIT_EEXISTS
}
func MakeGitError(errorCode C.int) error {
err := C.giterr_last()
if err == nil {
return &GitError{"No message", C.GITERR_INVALID, C.GIT_ERROR}
}
return &GitError{C.GoString(err.message), int(err.klass), int(errorCode)}
}
func cbool(b bool) C.int {
if b {
return C.int(1)
}
return C.int(0)
}
func ucbool(b bool) C.uint {
if b {
return C.uint(1)
}
return C.uint(0)
}
func Discover(start string, across_fs bool, ceiling_dirs []string) (string, error) {
ceildirs := C.CString(strings.Join(ceiling_dirs, string(C.GIT_PATH_LIST_SEPARATOR)))
defer C.free(unsafe.Pointer(ceildirs))
cstart := C.CString(start)
defer C.free(unsafe.Pointer(cstart))
var buf C.git_buf
defer C.git_buf_free(&buf)
runtime.LockOSThread()
defer runtime.UnlockOSThread()
ret := C.git_repository_discover(&buf, cstart, cbool(across_fs), ceildirs)
if ret < 0 {
return "", MakeGitError(ret)
}
return C.GoString(buf.ptr), nil
}
|
