[PATCH 2/2] subtree: fix assumption about the directory separator

["Johannes Schindelin via GitGitGadget" <gitgitgadget@gmail.com>]

From: Johannes Schindelin <johannes.schindelin@gmx.de>

On Windows, both forward and backslash are valid separators. In
22d550749361 (subtree: don't fuss with PATH, 2021-04-27), however, we
added code that assumes that it can only be the forward slash.

Let's fix that.

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
---
 contrib/subtree/git-subtree.sh | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/contrib/subtree/git-subtree.sh b/contrib/subtree/git-subtree.sh
index 6bd689a6bb92..d11ac56f9eb8 100755
--- a/contrib/subtree/git-subtree.sh
+++ b/contrib/subtree/git-subtree.sh
@@ -13,6 +13,8 @@ if test -z "$GIT_EXEC_PATH" || {
 	}
 } || ! test -f "$GIT_EXEC_PATH/git-sh-setup"
 then
+	base=${0##*/}
+	base=${base##*\\}
 	echo >&2 'It looks like either your git installation or your'
 	echo >&2 'git-subtree installation is broken.'
 	echo >&2
@@ -20,10 +22,10 @@ then
 	echo >&2 " - If \`git --exec-path\` does not print the correct path to"
 	echo >&2 "   your git install directory, then set the GIT_EXEC_PATH"
 	echo >&2 "   environment variable to the correct directory."
-	echo >&2 " - Make sure that your \`${0##*/}\` file is either in your"
+	echo >&2 " - Make sure that your \`$base\` file is either in your"
 	echo >&2 "   PATH or in your git exec path (\`$(git --exec-path)\`)."
-	echo >&2 " - You should run git-subtree as \`git ${0##*/git-}\`,"
-	echo >&2 "   not as \`${0##*/}\`." >&2
+	echo >&2 " - You should run git-subtree as \`git ${base#git-}\`,"
+	echo >&2 "   not as \`$base\`." >&2
 	exit 126
 fi
 
-- 
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