新增：获取commit下diff内容

routers/hat/hat.go

@@ -70,6 +70,9 @@ func Routers(ctx gocontext.Context) *web.Route {
 				m.Group("/branches", func() {
 					m.Get("/branches_slice", context.ReferencesGitRepo(), repo.ListBranchesSlice)
 				}, reqRepoReader(unit_model.TypeCode))
+				m.Group("/commits", func() {
+					m.Get("/{sha}/diff", repo.GetCommitDiff)
+				}, context.ReferencesGitRepo(), reqRepoReader(unit.TypeCode))
 				m.Group("/tags", func() {
 					m.Get("", repo.ListTags)
 				}, reqRepoReader(unit_model.TypeCode), context.ReferencesGitRepo(true))

routers/hat/repo/commits.go

@@ -15,6 +15,7 @@ import (
 	"code.gitea.io/gitea/modules/setting"
 	api "code.gitea.io/gitea/modules/structs"
 	"code.gitea.io/gitea/routers/api/v1/utils"
+	"code.gitea.io/gitea/services/gitdiff"
 	hat_convert "code.gitlink.org.cn/Gitlink/gitea_hat.git/modules/convert"
 	hat_git "code.gitlink.org.cn/Gitlink/gitea_hat.git/modules/git"
 )
@@ -237,3 +238,34 @@ func getCommit(ctx *context.APIContext, indentifier string) {
 	}
 	ctx.JSON(http.StatusOK, json)
 }
+
+func GetCommitDiff(ctx *context.APIContext) {
+	commitID := ctx.Params(":sha")
+	gitRepo := ctx.Repo.GitRepo
+
+	commit, err := gitRepo.GetCommit(commitID)
+	if err != nil {
+		if git.IsErrNotExist(err) {
+			ctx.NotFound(commitID)
+			return
+		}
+		ctx.Error(http.StatusInternalServerError, "gitRepo.GetCommit", err)
+		return
+	}
+
+	if len(commitID) != 40 {
+		commitID = commit.ID.String()
+	}
+
+	diff, err := gitdiff.GetDiff(gitRepo, &gitdiff.DiffOptions{
+		AfterCommitID:     commitID,
+		MaxLines:          setting.Git.MaxGitDiffLines,
+		MaxLineCharacters: setting.Git.MaxGitDiffLineCharacters,
+		MaxFiles:          setting.Git.MaxGitDiffFiles,
+	})
+	if err != nil {
+		ctx.NotFound("GetDIff", err)
+		return
+	}
+	ctx.JSON(http.StatusOK, &diff)
+}