repo_commit: Add patch view

4 files changed, 80 insertions, 3 deletions

diff --git a/git_format_patch.go b/git_format_patch.go
new file mode 100644
index 0000000..c899ed5
--- /dev/null
+++ b/git_format_patch.go
@@ -0,0 +1,59 @@
+package main
+
+import (
+	"bytes"
+	"errors"
+	"fmt"
+	"strings"
+	"time"
+
+	"github.com/go-git/go-git/v5/plumbing/object"
+	"go.lindenii.runxiyu.org/lindenii-common/misc"
+)
+
+var err_get_patch = errors.New("Failed to get patch from commit")
+
+func format_patch_from_commit(commit *object.Commit) (string, error) {
+	parent, err := commit.Parent(0)
+	if err != nil {
+		return "", err
+	}
+
+	var patch *object.Patch
+	patch, err = parent.Patch(commit)
+	if err != nil {
+		return "", misc.Wrap_one_error(err_get_patch, err)
+	}
+
+	var buf bytes.Buffer
+
+	author := commit.Author
+	date := author.When.Format(time.RFC1123Z)
+
+	commit_msg_title, commit_msg_details, _ := strings.Cut(commit.Message, "\n")
+
+	fmt.Fprintf(&buf, "From %s Mon Sep 17 00:00:00 2001\n", commit.Hash)
+	fmt.Fprintf(&buf, "From: %s <%s>\n", author.Name, author.Email)
+	fmt.Fprintf(&buf, "Date: %s\n", date)
+	fmt.Fprintf(&buf, "Subject: [PATCH] %s\n\n", commit_msg_title)
+
+	if commit_msg_details != "" {
+		fmt.Println("fdsafsad")
+		commit_msg_details_first_line, commit_msg_details_rest, _ := strings.Cut(commit_msg_details, "\n")
+		if strings.TrimSpace(commit_msg_details_first_line) == "" {
+			commit_msg_details = commit_msg_details_rest
+		}
+		buf.WriteString(commit_msg_details)
+		buf.WriteString("\n")
+	}
+	buf.WriteString("---\n")
+	fmt.Fprint(&buf, patch.Stats().String())
+	fmt.Fprintln(&buf)
+
+	buf.WriteString(patch.String())
+
+	fmt.Fprintf(&buf, "\n-- \n2.48.1\n")
+
+	return buf.String(), nil
+}
+
diff --git a/handle_repo_commit.go b/handle_repo_commit.go
index 4660ff3..9e10a9f 100644
--- a/handle_repo_commit.go
+++ b/handle_repo_commit.go
@@ -2,6 +2,7 @@ package main
 
 import (
 	"net/http"
+	"strings"
 
 	"github.com/go-git/go-git/v5/plumbing"
 	"github.com/go-git/go-git/v5/plumbing/format/diff"
@@ -17,19 +18,32 @@ func handle_repo_commit(w http.ResponseWriter, r *http.Request) {
 	data := make(map[string]any)
 	// TODO: Sanitize path values
 	group_name, repo_name, commit_id_string := r.PathValue("group_name"), r.PathValue("repo_name"), r.PathValue("commit_id")
-	data["group_name"], data["repo_name"], data["commit_id"] = group_name, repo_name, commit_id_string
+	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 := plumbing.NewHash(commit_id_string)
+	commit_id_string_real := strings.TrimSuffix(commit_id_string, ".patch")
+	commit_id := plumbing.NewHash(commit_id_string_real)
 	commit_object, err := repo.CommitObject(commit_id)
 	if err != nil {
 		_, _ = w.Write([]byte("Error getting commit object: " + err.Error()))
 		return
 	}
+
+	if commit_id_string_real != commit_id_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
+	}
+
 	data["commit_object"] = commit_object
+	data["commit_id"] = commit_object.Hash.String()
 
 	parent_commit_object, err := commit_object.Parent(0)
 	if err != nil {
diff --git a/main.go b/main.go
index 02e48a3..b7a9b76 100644
--- a/main.go
+++ b/main.go
@@ -39,7 +39,7 @@ func main() {
 	http.HandleFunc("/g/{group_name}/repos/{repo_name}/tree/{ref}/{rest...}", handle_repo_tree)
 	http.HandleFunc("/g/{group_name}/repos/{repo_name}/raw/{ref}/{rest...}", handle_repo_raw)
 	http.HandleFunc("/g/{group_name}/repos/{repo_name}/log/{ref}/", handle_repo_log)
-	http.HandleFunc("/g/{group_name}/repos/{repo_name}/commit/{commit_id}/", handle_repo_commit)
+	http.HandleFunc("/g/{group_name}/repos/{repo_name}/commit/{commit_id}", handle_repo_commit)
 
 	listener, err := net.Listen(config.HTTP.Net, config.HTTP.Addr)
 	if err != nil {
diff --git a/templates/repo_commit.html.tmpl b/templates/repo_commit.html.tmpl
index 5b6cb84..a288949 100644
--- a/templates/repo_commit.html.tmpl
+++ b/templates/repo_commit.html.tmpl
@@ -38,6 +38,10 @@
 						<th scope="row">Message</th>
 						<td><pre>{{ .commit_object.Message }}</pre></td>
 					</tr>
+					<tr>
+						<th scope="row">Actions</th>
+						<td><pre><a href="{{ .commit_object.Hash }}.patch">Get as Patch</a></pre></td>
+					</tr>
 				</tbody>
 			</table>
 		</div>