From 513285460356084daf27c97efddcc585b2531c16 Mon Sep 17 00:00:00 2001
From: mirko <mirko@owlcode.it>
Date: Sun, 15 Dec 2024 19:46:21 +0100
Subject: [PATCH] Add support for diff and patch compare

---
 routers/web/repo/compare.go | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

diff --git a/routers/web/repo/compare.go b/routers/web/repo/compare.go
index 03d49fa692..27b1da13c2 100644
--- a/routers/web/repo/compare.go
+++ b/routers/web/repo/compare.go
@@ -231,6 +231,10 @@ func ParseCompareInfo(ctx *context.Context) *common.CompareInfo {
 	if infoPath == "" {
 		infos = []string{baseRepo.DefaultBranch, baseRepo.DefaultBranch}
 	} else {
+		infoPath, isDiff := strings.CutSuffix(infoPath, ".diff")
+		ctx.Data["DownloadDiff"] = isDiff
+		infoPath, isPatch := strings.CutSuffix(infoPath, ".patch")
+		ctx.Data["DownloadPatch"] = isPatch
 		infos = strings.SplitN(infoPath, "...", 2)
 		if len(infos) != 2 {
 			if infos = strings.SplitN(infoPath, "..", 2); len(infos) == 2 {
@@ -717,6 +721,22 @@ func CompareDiff(ctx *context.Context) {
 		return
 	}
 
+	if ctx.Data["DownloadDiff"].(bool) {
+		err := git.GetRepoRawDiffForFile(ci.HeadGitRepo, ci.BaseBranch, ci.HeadBranch,git.RawDiffNormal,"", ctx.Resp)
+		if err != nil {
+			ctx.ServerError("GetDiff", err)
+			return
+		}
+	}
+
+	if ctx.Data["DownloadPatch"].(bool) {
+		err := git.GetRepoRawDiffForFile(ci.HeadGitRepo, ci.BaseBranch, ci.HeadBranch,git.RawDiffPatch,"", ctx.Resp)
+		if err != nil {
+			ctx.ServerError("GetPatch", err)
+			return
+		}
+	}
+
 	ctx.Data["PullRequestWorkInProgressPrefixes"] = setting.Repository.PullRequest.WorkInProgressPrefixes
 	ctx.Data["DirectComparison"] = ci.DirectComparison
 	ctx.Data["OtherCompareSeparator"] = ".."