documentation: trivial style cleanups

[thirdparty/git.git] / git-sh-setup.sh

diff --git a/git-sh-setup.sh b/git-sh-setup.sh
index 9cfbe7f1435e073eeb39ab2190eda2d2dda300a5..2f7835941ecaa48be17b6dd64e64fb0df3db37e2 100644 (file)
--- a/git-sh-setup.sh
+++ b/git-sh-setup.sh
@@ -249,6 +249,18 @@ clear_local_git_env() {
        unset $(git rev-parse --local-env-vars)
 }
 
+# Generate a virtual base file for a two-file merge. Uses git apply to
+# remove lines from $1 that are not in $2, leaving only common lines.
+create_virtual_base() {
+       sz0=$(wc -c <"$1")
+       @@DIFF@@ -u -La/"$1" -Lb/"$1" "$1" "$2" | git apply --no-add
+       sz1=$(wc -c <"$1")
+
+       # If we do not have enough common material, it is not
+       # worth trying two-file merge using common subsections.
+       expr $sz0 \< $sz1 \* 2 >/dev/null || : >"$1"
+}
+
 
 # Platform specific tweaks to work around some commands
 case $(uname -s) in