From a655d1d81f76cf652d3fb739834b85414f766ba6 Mon Sep 17 00:00:00 2001
From: Ray Shirohara <RShirohara@proton.me>
Date: Sun, 9 Mar 2025 23:56:09 +0900
Subject: [PATCH] feat: add `partial` option support to `GitBackend`

---
 commands_test.go |  2 ++
 vcs.go           |  7 ++++++-
 vcs_test.go      | 20 ++++++++++++++++++++
 3 files changed, 28 insertions(+), 1 deletion(-)

diff --git a/commands_test.go b/commands_test.go
index 7c4315f..062a7ab 100644
--- a/commands_test.go
+++ b/commands_test.go
@@ -15,6 +15,7 @@ type _cloneArgs struct {
 	recursive bool
 	bare      bool
 	silent    bool
+	partial   string
 }
 
 type _updateArgs struct {
@@ -41,6 +42,7 @@ func withFakeGitBackend(t *testing.T, block func(*testing.T, string, *_cloneArgs
 				recursive: vg.recursive,
 				bare:      vg.bare,
 				silent:    vg.silent,
+				partial:   vg.partial,
 			}
 			return nil
 		},
diff --git a/vcs.go b/vcs.go
index c075c92..dd2a1a2 100644
--- a/vcs.go
+++ b/vcs.go
@@ -44,7 +44,7 @@ type vcsGetOption struct {
 	url                              *url.URL
 	dir                              string
 	recursive, shallow, silent, bare bool
-	branch                           string
+	branch, partial                  string
 }
 
 // GitBackend is the VCSBackend of git
@@ -70,6 +70,11 @@ var GitBackend = &VCSBackend{
 		if vg.bare {
 			args = append(args, "--bare")
 		}
+		if vg.partial == "blobless" {
+			args = append(args, "--filter=blob:none")
+		} else if vg.partial == "treeless" {
+			args = append(args, "--filter=tree:0")
+		}
 		args = append(args, vg.url.String(), vg.dir)
 
 		return run(vg.silent)("git", args...)
diff --git a/vcs_test.go b/vcs_test.go
index 72e1c1d..00080dc 100644
--- a/vcs_test.go
+++ b/vcs_test.go
@@ -136,6 +136,26 @@ func TestVCSBackend(t *testing.T) {
 			})
 		},
 		expect: []string{"git", "clone", "--bare", remoteDummyURL.String(), localDir},
+	}, {
+		name: "[git] (partial) blobless clone",
+		f: func() error {
+			return GitBackend.Clone(&vcsGetOption{
+				url:     remoteDummyURL,
+				dir:     localDir,
+				partial: "blobless",
+			})
+		},
+		expect: []string{"git", "clone", "--filter=blob:none", remoteDummyURL.String(), localDir},
+	}, {
+		name: "[git] (partial) treeless clone",
+		f: func() error {
+			return GitBackend.Clone(&vcsGetOption{
+				url:     remoteDummyURL,
+				dir:     localDir,
+				partial: "treeless",
+			})
+		},
+		expect: []string{"git", "clone", "--filter=tree:0", remoteDummyURL.String(), localDir},
 	}, {
 		name: "[git] switch git-svn on update",
 		f: func() error {