package main
import (
"errors"
"net/http"
"strings"
"github.com/go-git/go-git/v5/plumbing"
"github.com/go-git/go-git/v5/plumbing/object"
"github.com/go-git/go-git/v5/plumbing/filemode"
"github.com/go-git/go-git/v5/plumbing/format/diff"
"go.lindenii.runxiyu.org/lindenii-common/misc"
)
type usable_file_patch struct {
From diff.File
To diff.File
Chunks []diff.Chunk
}
func handle_repo_commit(w http.ResponseWriter, r *http.Request) {
data := make(map[string]any)
group_name, repo_name, commit_id_specified_string := r.PathValue("group_name"), r.PathValue("repo_name"), r.PathValue("commit_id")
data["group_name"], data["repo_name"] = group_name, repo_name
repo, err := open_git_repo(group_name, repo_name)
if err != nil {
_, _ = w.Write([]byte("Error opening repo: " + err.Error()))
return
}
commit_id_specified_string_without_suffix := strings.TrimSuffix(commit_id_specified_string, ".patch")
commit_id := plumbing.NewHash(commit_id_specified_string_without_suffix)
commit_object, err := repo.CommitObject(commit_id)
if err != nil {
_, _ = w.Write([]byte("Error getting commit object: " + err.Error()))
return
}
if commit_id_specified_string_without_suffix != commit_id_specified_string {
patch, err := format_patch_from_commit(commit_object)
if err != nil {
_, _ = w.Write([]byte("Error formatting patch: " + err.Error()))
return
}
_, _ = w.Write([]byte(patch))
return
}
commit_id_string := commit_object.Hash.String()
if commit_id_string != commit_id_specified_string {
http.Redirect(w, r, commit_id_string, http.StatusSeeOther)
return
}
data["commit_object"] = commit_object
data["commit_id"] = commit_id_string
var patch *object.Patch
parent_commit_object, err := commit_object.Parent(0)
if err != nil {
if errors.Is(err, object.ErrParentNotFound) {
commit_tree, err := commit_object.Tree()
if err != nil {
_, _ = w.Write([]byte("Error getting commit tree (for comparing against an empty tree): " + err.Error()))
return
}
patch, err = (&object.Tree{}).Patch(commit_tree)
if err != nil {
_, _ = w.Write([]byte("Error getting patch of commit: " + err.Error()))
return
}
} else if err != nil {
_, _ = w.Write([]byte("Error getting parent commit object: " + err.Error()))
return
}
data["parent_commit_object"] = parent_commit_object
patch, err := parent_commit_object.Patch(commit_object)
if err != nil {
_, _ = w.Write([]byte("Error getting patch of commit: " + err.Error()))
return
} else {
data["parent_commit_hash"] = parent_commit_object.Hash.String()
patch, err = parent_commit_object.Patch(commit_object)
if err != nil {
_, _ = w.Write([]byte("Error getting patch of commit: " + err.Error()))
return
}
}
data["patch"] = patch
// TODO: Remove unnecessary context
usable_file_patches := make([]usable_file_patch, 0)
for _, file_patch := range patch.FilePatches() {
from, to := file_patch.Files()
if from == nil {
from = fake_diff_file_null
}
if to == nil {
to = fake_diff_file_null
}
usable_file_patch := usable_file_patch{
Chunks: file_patch.Chunks(),
From: from,
To: to,
}
usable_file_patches = append(usable_file_patches, usable_file_patch)
}
data["file_patches"] = usable_file_patches
err = templates.ExecuteTemplate(w, "repo_commit", data)
if err != nil {
_, _ = w.Write([]byte("Error rendering template: " + err.Error()))
return
}
}
type fake_diff_file struct {
hash plumbing.Hash
mode filemode.FileMode
path string
}
func (f fake_diff_file) Hash() plumbing.Hash {
return f.hash
}
func (f fake_diff_file) Mode() filemode.FileMode {
return f.mode
}
func (f fake_diff_file) Path() string {
return f.path
}
var fake_diff_file_null = fake_diff_file{
hash: plumbing.NewHash("e69de29bb2d1d6434b8b29ae775ad8c2e48c5391"),
mode: misc.First_or_panic(filemode.New("100644")),
path: "NULL",
}