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package git
import (
"bufio"
"bytes"
"errors"
"fmt"
"io"
"gopkg.in/src-d/go-git.v2/core"
)
// New errors defined by this package.
var ErrFileNotFound = errors.New("file not found")
type Hash core.Hash
// 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 core.Hash
Author Signature
Committer Signature
Message string
tree core.Hash
parents []core.Hash
r *Repository
}
func (c *Commit) Tree() *Tree {
tree, _ := c.r.Tree(c.tree)
return tree
}
func (c *Commit) Parents() *CommitIter {
i := NewCommitIter(c.r)
go func() {
defer i.Close()
for _, hash := range c.parents {
obj, _ := c.r.Storage.Get(hash)
i.Add(obj)
}
}()
return i
}
// NumParents returns the number of parents in a commit.
func (c *Commit) NumParents() int {
return len(c.parents)
}
// File returns the file with the specified "path" in the commit and a
// nil error if the file exists. If the file does not exists, it returns
// a nil file and the ErrFileNotFound error.
func (c *Commit) File(path string) (file *File, err error) {
for file := range c.Tree().Files() {
if file.Name == path {
return file, nil
}
}
return nil, ErrFileNotFound
}
// Decode transform an core.Object into a Blob struct
func (c *Commit) Decode(o core.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 = core.NewHash(string(split[1]))
case "parent":
c.parents = append(c.parents, core.NewHash(string(split[1])))
case "author":
c.Author.Decode(split[1])
case "committer":
c.Committer.Decode(split[1])
}
} else {
c.Message += string(line) + "\n"
}
if err == io.EOF {
return nil
}
}
}
func (c *Commit) String() string {
return fmt.Sprintf(
"%s %s\nAuthor: %s\nDate: %s\n",
core.CommitObject, c.Hash, c.Author.String(), c.Author.When,
)
}
type CommitIter struct {
iter
}
func NewCommitIter(r *Repository) *CommitIter {
return &CommitIter{newIter(r)}
}
func (i *CommitIter) Next() (*Commit, error) {
obj := <-i.ch
if obj == nil {
return nil, io.EOF
}
commit := &Commit{r: i.r}
return commit, commit.Decode(obj)
}
type iter struct {
ch chan core.Object
r *Repository
IsClosed bool
}
func newIter(r *Repository) iter {
ch := make(chan core.Object, 1)
return iter{ch: ch, r: r}
}
func (i *iter) Add(o core.Object) {
if i.IsClosed {
return
}
i.ch <- o
}
func (i *iter) Close() {
if i.IsClosed {
return
}
defer func() { i.IsClosed = true }()
close(i.ch)
}
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