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-rwxr-xr-xgit-diff.sh17
1 files changed, 15 insertions, 2 deletions
diff --git a/git-diff.sh b/git-diff.sh
index b3ec84be69..7baf7044e4 100755
--- a/git-diff.sh
+++ b/git-diff.sh
@@ -7,8 +7,6 @@ rev=$(git-rev-parse --revs-only --no-flags --sq "$@") || exit
flags=$(git-rev-parse --no-revs --flags --sq "$@")
files=$(git-rev-parse --no-revs --no-flags --sq "$@")
-: ${flags:="'-M' '-p'"}
-
# I often say 'git diff --cached -p' and get scolded by git-diff-files, but
# obviously I mean 'git diff --cached -p HEAD' in that case.
case "$rev" in
@@ -20,6 +18,21 @@ case "$rev" in
esac
esac
+# If we do not have --name-status, --name-only nor -r, default to -p.
+# If we do not have -B nor -C, default to -M.
+case " $flags " in
+*" '--name-status' "* | *" '--name-only' "* | *" '-r' "* )
+ ;;
+*)
+ flags="$flags'-p' " ;;
+esac
+case " $flags " in
+*" '-"[BCM]* | *" '--find-copies-harder' "*)
+ ;; # something like -M50.
+*)
+ flags="$flags'-M' " ;;
+esac
+
case "$rev" in
?*' '?*' '?*)
echo >&2 "I don't understand"