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package git
import (
"bufio"
"bytes"
"fmt"
"io"
"sort"
"gopkg.in/src-d/go-git.v4/core"
)
// Hash hash of an object
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
}
// Tree returns the Tree from the commit
func (c *Commit) Tree() *Tree {
tree, _ := c.r.Tree(c.tree) // FIXME: Return error as well?
return tree
}
// Parents return a CommitIter to the parent Commits
func (c *Commit) Parents() *CommitIter {
return NewCommitIter(c.r, core.NewObjectLookupIter(
c.r.s.ObjectStorage(),
c.parents,
))
}
// 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 exist, it returns
// a nil file and the ErrFileNotFound error.
func (c *Commit) File(path string) (file *File, err error) {
return c.Tree().File(path)
}
// ID returns the object ID of the commit. The returned value will always match
// the current value of Commit.Hash.
//
// ID is present to fulfill the Object interface.
func (c *Commit) ID() core.Hash {
return c.Hash
}
// Type returns the type of object. It always returns core.CommitObject.
//
// Type is present to fulfill the Object interface.
func (c *Commit) Type() core.ObjectType {
return core.CommitObject
}
// Decode transforms a core.Object into a Commit struct.
func (c *Commit) Decode(o core.Object) (err error) {
if o.Type() != core.CommitObject {
return ErrUnsupportedObject
}
c.Hash = o.Hash()
reader, err := o.Reader()
if err != nil {
return err
}
defer checkClose(reader, &err)
r := bufio.NewReader(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,
)
}
// CommitIter provides an iterator for a set of commits.
type CommitIter struct {
core.ObjectIter
r *Repository
}
// NewCommitIter returns a CommitIter for the given repository and underlying
// object iterator.
//
// The returned CommitIter will automatically skip over non-commit objects.
func NewCommitIter(r *Repository, iter core.ObjectIter) *CommitIter {
return &CommitIter{iter, r}
}
// Next moves the iterator to the next commit and returns a pointer to it. If it
// has reached the end of the set it will return io.EOF.
func (iter *CommitIter) Next() (*Commit, error) {
obj, err := iter.ObjectIter.Next()
if err != nil {
return nil, err
}
commit := &Commit{r: iter.r}
return commit, commit.Decode(obj)
}
// ForEach call the cb function for each commit contained on this iter until
// an error happends or the end of the iter is reached. If ErrStop is sent
// the iteration is stop but no error is returned
func (iter *CommitIter) ForEach(cb func(*Commit) error) error {
return iter.ObjectIter.ForEach(func(obj core.Object) error {
commit := &Commit{r: iter.r}
if err := commit.Decode(obj); err != nil {
return err
}
return cb(commit)
})
}
type commitSorterer struct {
l []*Commit
}
func (s commitSorterer) Len() int {
return len(s.l)
}
func (s commitSorterer) Less(i, j int) bool {
return s.l[i].Committer.When.Before(s.l[j].Committer.When)
}
func (s commitSorterer) Swap(i, j int) {
s.l[i], s.l[j] = s.l[j], s.l[i]
}
// SortCommits sort a commit list by commit date, from older to newer.
func SortCommits(l []*Commit) {
s := &commitSorterer{l}
sort.Sort(s)
}
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