From e4b52d55a8adf1dba841689c0716d9a943e0dc2b Mon Sep 17 00:00:00 2001
From: FUTATSUKI Yasuhito <futatuki@yf.bsdclub.org>
Date: Sun, 27 Aug 2023 00:02:36 +0900
Subject: [PATCH] Implement -u option with no effect

If "svn diff --diff-cmd" is called without -x option, svn executes
external diff command with -u option. So this allows to use
difft as external diff for Apache Subversion, without extra options.
---
 src/options.rs | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/src/options.rs b/src/options.rs
index 6a989cef3b..5a9fb09b33 100644
--- a/src/options.rs
+++ b/src/options.rs
@@ -135,6 +135,13 @@ fn app() -> clap::Command<'static> {
                 .validator(|s| s.parse::<u32>())
                 .required(false),
         )
+        .arg(
+            // Dummy 'unified' flag of POSIX/GNU diff utility for svn support:
+            // This takes no effect.
+            Arg::new("nop_unified")
+                .short('u')
+                .hide(true)
+        )
         .arg(
             Arg::new("label").short('L')
                 .long("label")