From ecd8e120b47d6735e1dbfa6728b8c082c1104096 Mon Sep 17 00:00:00 2001
From: Nicholas Rodine <nicholas@arnica.io>
Date: Tue, 30 Jan 2024 13:44:24 -0500
Subject: [PATCH 1/3] Added `.idea` dir to .gitignore (for GoLand IDE)

---
 .gitignore | 1 +
 1 file changed, 1 insertion(+)
 create mode 100644 .gitignore

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..9f11b75
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1 @@
+.idea/

From 664b1fd682afbd9f90f7b617a0bb234b5b5a8e29 Mon Sep 17 00:00:00 2001
From: Nicholas Rodine <nicholas@arnica.io>
Date: Tue, 30 Jan 2024 13:44:47 -0500
Subject: [PATCH 2/3] Added unit test to reproduce the issue

---
 gitdiff/parser_test.go | 36 ++++++++++++++++++++++++++++++++++++
 1 file changed, 36 insertions(+)

diff --git a/gitdiff/parser_test.go b/gitdiff/parser_test.go
index 5040b0a..2e7a91a 100644
--- a/gitdiff/parser_test.go
+++ b/gitdiff/parser_test.go
@@ -301,6 +301,42 @@ a wild fragment appears?
 `,
 			Err: true,
 		},
+		"mergeHeaderFollowedByNormalHeader": {
+			Input: `commit f6ded7a51cf917bdb44097066fab608c0facde5b
+Merge: b2cf1cd0de 0254477421
+Author: BoloniniD <denis@bolonin.ru>
+Date:   Thu Apr 7 01:07:38 2022 +0300
+
+    Merge branch 'BLAKE3' of github.com:BoloniniD/ClickHouse into BLAKE3
+
+commit 645e156af6b362145fad82d714f8e70a5b5a55a8
+Author: Meena Renganathan <Meena.Renganathan@ibm.com>
+Date:   Wed Apr 6 14:50:10 2022 -0700
+
+    Updated the boringssl-cmake to match the latest broingssl module update
+
+diff --git a/.gitmodules b/.gitmodules
+index 6c9e66f9cb..9cee5f697e 100644
+--- a/.gitmodules
++++ b/.gitmodules
+@@ -207 +206,0 @@
+-       branch = MergeWithUpstream
+`,
+			Output: &File{
+				OldName:      ".gitmodules",
+				NewName:      ".gitmodules",
+				OldMode:      os.FileMode(0100644),
+				OldOIDPrefix: "6c9e66f9cb",
+				NewOIDPrefix: "9cee5f697e",
+			},
+			Preamble: `commit 645e156af6b362145fad82d714f8e70a5b5a55a8
+Author: Meena Renganathan <Meena.Renganathan@ibm.com>
+Date:   Wed Apr 6 14:50:10 2022 -0700
+
+    Updated the boringssl-cmake to match the latest broingssl module update
+
+`,
+		},
 	}
 
 	for name, test := range tests {

From 8d42dd9d0d5580634ddfddf9f5ee6d7c8d768bb0 Mon Sep 17 00:00:00 2001
From: Nicholas Rodine <nicholas@arnica.io>
Date: Tue, 30 Jan 2024 13:45:48 -0500
Subject: [PATCH 3/3] Fixed issue by resetting the preamble if a new commit is
 encountered.

---
 gitdiff/file_header.go | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/gitdiff/file_header.go b/gitdiff/file_header.go
index 58904b4..1962e64 100644
--- a/gitdiff/file_header.go
+++ b/gitdiff/file_header.go
@@ -30,6 +30,12 @@ func (p *parser) ParseNextFileHeader() (*File, string, error) {
 			return nil, "", p.Errorf(-1, "patch fragment without file header: %s", frag.Header())
 		}
 
+		// check for end of merge header, and start of a new header
+		if strings.HasPrefix(p.Line(0), commitPrefix) {
+			preamble.Reset()
+			goto NextLine
+		}
+
 		// check for a git-generated patch
 		file, err = p.ParseGitFileHeader()
 		if err != nil {