git/diff.go
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package git
import (
"fmt"
"log"
"strings"
"github.com/bluekeyes/go-gitdiff/gitdiff"
"github.com/go-git/go-git/v5/plumbing/object"
)
type TextFragment struct {
Header string
Lines []gitdiff.Line
}
type Diff struct {
Name struct {
Old string
New string
}
TextFragments []TextFragment
}
// A nicer git diff representation.
type NiceDiff struct {
Commit struct {
Message string
Author object.Signature
This string
Parent string
}
Stat struct {
FilesChanged int
Insertions int
Deletions int
}
Diff []Diff
}
func (g *GitRepo) Diff() (*NiceDiff, error) {
c, err := g.r.CommitObject(g.h)
if err != nil {
return nil, fmt.Errorf("commit object: %w", err)
}
patch := &object.Patch{}
commitTree, err := c.Tree()
parent := &object.Commit{}
if err == nil {
parentTree := &object.Tree{}
if c.NumParents() != 0 {
parent, err = c.Parents().Next()
if err == nil {
parentTree, err = parent.Tree()
if err == nil {
patch, err = parentTree.Patch(commitTree)
if err != nil {
return nil, fmt.Errorf("patch: %w", err)
}
}
}
} else {
patch, err = parentTree.Patch(commitTree)
if err != nil {
return nil, fmt.Errorf("patch: %w", err)
}
}
}
diffs, _, err := gitdiff.Parse(strings.NewReader(patch.String()))
if err != nil {
log.Println(err)
}
nd := NiceDiff{}
nd.Commit.This = c.Hash.String()
if parent.Hash.IsZero() {
nd.Commit.Parent = ""
} else {
nd.Commit.Parent = parent.Hash.String()
}
nd.Commit.Author = c.Author
nd.Commit.Message = c.Message
for _, d := range diffs {
ndiff := Diff{}
ndiff.Name.New = d.NewName
ndiff.Name.Old = d.OldName
for _, tf := range d.TextFragments {
ndiff.TextFragments = append(ndiff.TextFragments, TextFragment{
Header: tf.Header(),
Lines: tf.Lines,
})
for _, l := range tf.Lines {
switch l.Op {
case gitdiff.OpAdd:
nd.Stat.Insertions += 1
case gitdiff.OpDelete:
nd.Stat.Deletions += 1
}
}
}
nd.Diff = append(nd.Diff, ndiff)
}
nd.Stat.FilesChanged = len(diffs)
return &nd, nil
}