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package main
import (
"strconv"
"io"
"bytes"
"fmt"
"os/exec"
"time"
"errors"
)
func GitPull() error {
return exec.Command("git", "pull").Run()
}
func GitPush() error {
return exec.Command("git", "push").Run()
}
type Edit struct {
UserName string
UserEmail string
Time time.Time
Message string
Files map[string][]byte
}
func gitTime(t time.Time) string {
return fmt.Sprintf("%d %s", t.Unix(), t.Format("-0700"))
}
func (edit Edit) WriteTo(w io.Writer) error {
var err error
commit := make([]string, len(edit.Files))
i := 0
for name, content := range edit.Files {
commit[i] = name
if content != nil {
if _, err = fmt.Fprintf(w, "blob\nmark :%d\ndata %d\n%s", i+1, len(content), content); err != nil {
return err
}
}
}
_, err = fmt.Fprintf(w, `commit HEAD
author %s <%s> %s
committer %s <%s> %s
data %d
%sfrom HEAD
`,
edit.UserName, edit.UserEmail, gitTime(edit.Time),
edit.UserName, edit.UserEmail, gitTime(edit.Time),
len(edit.Message), edit.Message)
if err != nil {
return err
}
for i, filename := range commit {
if edit.Files[filename] != nil {
if _, err = fmt.Fprintf(w, "M 100644 :%d %s\n", i+1, filename); err != nil {
return err
}
} else {
if _, err = fmt.Fprintf(w, "D %s\n", filename); err != nil {
return err
}
}
}
return nil
}
func GitCommit(edit Edit) error {
cmd := exec.Command("git", "fast-import")
pip, err := cmd.StdinPipe()
if err != nil {
return err
}
if err = cmd.Start(); err != nil {
return err
}
werr := edit.WriteTo(pip)
if err = cmd.Wait(); err == nil {
err = werr
}
return err
}
type GitFile struct {
Mode int32 // 18 bits unsigned
Type string
Hash string
Size int64
}
type GitTree map[string]GitFile
var ParseError = errors.New("git ls-tree parse error")
func GitLsTree() (GitTree, error) {
data, err := exec.Command("git", "ls-tree", "-trlz", "HEAD").Output()
if err != nil {
return nil, err
}
lines := bytes.Split(data, []byte{0})
ret := make(GitTree, len(lines)-1)
for _, line := range lines[:len(ret)] {
// trim the trailing "\0"
if line[len(line)-1] != 0 {
return nil, ParseError
}
line = line[:len(line)-1]
// line = mode SP type SP hash SP size TAB name
a := bytes.SplitN(line, []byte{' '}, 4)
if len(a) != 4 {
return nil, ParseError
}
b := bytes.SplitN(a[3], []byte{'\t'}, 2)
if len(b) != 2 {
return nil, ParseError
}
fmode := a[0]
ftype := a[1]
fhash := a[2]
fsize := b[0]
fname := b[1]
fmodeN, err := strconv.ParseInt(string(fmode), 10, 19)
if err != nil {
return nil, err
}
fsizeN := int64(-1)
fsizeS := string(fsize)
if fsizeS != "-" {
fsizeN, err = strconv.ParseInt(fsizeS, 10, 64)
if err != nil {
return nil, err
}
}
ret[string(fname)] = GitFile{
Mode: int32(fmodeN),
Type: string(ftype),
Hash: string(fhash),
Size: fsizeN,
}
}
return ret, nil
}
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