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package git
import (
"bufio"
"bytes"
"fmt"
"io"
"os"
"strconv"
"time"
"gopkg.in/src-d/go-git.v2/internal"
)
// Commit points to a single tree, marking it as what the project looked like
// at a certain point in time. It contains meta-information about that point
// in time, such as a timestamp, the author of the changes since the last
// commit, a pointer to the previous commit(s), etc.
// http://schacon.github.io/gitbook/1_the_git_object_model.html
type Commit struct {
Hash internal.Hash
Tree internal.Hash
Parents []internal.Hash
Author Signature
Committer Signature
Message string
}
// Decode transform an internal.Object into a Blob struct
func (c *Commit) Decode(o internal.Object) error {
c.Hash = o.Hash()
r := bufio.NewReader(o.Reader())
var message bool
for {
line, err := r.ReadSlice('\n')
if err != nil && err != io.EOF {
return err
}
line = bytes.TrimSpace(line)
if !message {
if len(line) == 0 {
message = true
continue
}
split := bytes.SplitN(line, []byte{' '}, 2)
switch string(split[0]) {
case "tree":
c.Tree = internal.NewHash(string(split[1]))
case "parent":
c.Parents = append(c.Parents, internal.NewHash(string(split[1])))
case "author":
c.Author = ParseSignature(split[1])
case "committer":
c.Committer = ParseSignature(split[1])
}
} else {
c.Message += string(line) + "\n"
}
if err == io.EOF {
return nil
}
}
}
// Tree is basically like a directory - it references a bunch of other trees
// and/or blobs (i.e. files and sub-directories)
type Tree struct {
Entries []TreeEntry
Hash internal.Hash
}
// TreeEntry represents a file
type TreeEntry struct {
Name string
Mode os.FileMode
Hash internal.Hash
}
// Decode transform an internal.Object into a Tree struct
func (t *Tree) Decode(o internal.Object) error {
t.Hash = o.Hash()
if o.Size() == 0 {
return nil
}
r := bufio.NewReader(o.Reader())
for {
mode, err := r.ReadString(' ')
if err != nil {
if err == io.EOF {
break
}
return err
}
fm, err := strconv.ParseInt(mode[:len(mode)-1], 8, 32)
if err != nil && err != io.EOF {
return err
}
name, err := r.ReadString(0)
if err != nil && err != io.EOF {
return err
}
var hash internal.Hash
_, err = r.Read(hash[:])
if err != nil && err != io.EOF {
return err
}
t.Entries = append(t.Entries, TreeEntry{
Hash: hash,
Mode: os.FileMode(fm),
Name: name[:len(name)-1],
})
}
return nil
}
// Blob is used to store file data - it is generally a file.
type Blob struct {
Hash internal.Hash
Size int64
obj internal.Object
}
// Decode transform an internal.Object into a Blob struct
func (b *Blob) Decode(o internal.Object) error {
b.Hash = o.Hash()
b.Size = o.Size()
b.obj = o
return nil
}
// Reader returns a reader allow the access to the content of the blob
func (b *Blob) Reader() io.Reader {
return b.obj.Reader()
}
// Signature represents an action signed by a person
type Signature struct {
Name string
Email string
When time.Time
}
// ParseSignature parse a byte slice returning a new action signature.
func ParseSignature(signature []byte) Signature {
ret := Signature{}
if len(signature) == 0 {
return ret
}
from := 0
state := 'n' // n: name, e: email, t: timestamp, z: timezone
for i := 0; ; i++ {
var c byte
var end bool
if i < len(signature) {
c = signature[i]
} else {
end = true
}
switch state {
case 'n':
if c == '<' || end {
if i == 0 {
break
}
ret.Name = string(signature[from : i-1])
state = 'e'
from = i + 1
}
case 'e':
if c == '>' || end {
ret.Email = string(signature[from:i])
i++
state = 't'
from = i + 1
}
case 't':
if c == ' ' || end {
t, err := strconv.ParseInt(string(signature[from:i]), 10, 64)
if err == nil {
ret.When = time.Unix(t, 0)
}
end = true
}
}
if end {
break
}
}
return ret
}
func (s *Signature) String() string {
return fmt.Sprintf("%q <%s> @ %s", s.Name, s.Email, s.When)
}
|
