[PATCH v2 2/4] userdiff: add diff.<driver>.process config

From: Michael Montalbo via GitGitGadget <gitgitgadget@gmail.com>
Date: May 25, 2026, 18:29 UTC
Message-ID: <de6d85f9d756c294b3f450f75c2d62b01a64ec86.1779733799.git.gitgitgadget@gmail.com>
In-Reply-To: <pull.2120.v2.git.1779733799.gitgitgadget@gmail.com>

From: Michael Montalbo <mmontalbo@gmail.com>

Add a new per-driver configuration key that specifies the command for a long-running diff process.

The name follows filter.<driver>.process: a long-running subprocess that stays alive across files within a single git invocation.

Signed-off-by: Michael Montalbo <mmontalbo@gmail.com>
---
 userdiff.c | 7 +++++++
 userdiff.h | 2 ++
 2 files changed, 9 insertions(+)

diff --git a/userdiff.c b/userdiff.c
index fe710a68bf..81c0bebcce 100644
--- a/userdiff.c
+++ b/userdiff.c
@@ -499,6 +499,13 @@ int userdiff_config(const char *k, const char *v)
 		drv->algorithm = drv->algorithm_owned;
 		return ret;
 	}
+	if (!strcmp(type, "process")) {
+		int ret;
+		FREE_AND_NULL(drv->process_owned);
+		ret = git_config_string(&drv->process_owned, k, v);
+		drv->process = drv->process_owned;
+		return ret;
+	}
 
 	return 0;
 }
diff --git a/userdiff.h b/userdiff.h
index 827361b0bc..51c26e0d41 100644
--- a/userdiff.h
+++ b/userdiff.h
@@ -31,6 +31,8 @@ struct userdiff_driver {
 	char *textconv_owned;
 	struct notes_cache *textconv_cache;
 	int textconv_want_cache;
+	const char *process;
+	char *process_owned;
 };
 enum userdiff_driver_type {
 	USERDIFF_DRIVER_TYPE_BUILTIN = 1<<0,

-- 
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