test-lib.sh: Add a test_set_editor function to safely set $VISUAL

In particular, this function correctly handles cases where the pwd contains
spaces, quotes, and other troublesome metacharacters.

Signed-off-by: Bryan Donlan <bdonlan@fushizen.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/t/test-lib.sh b/t/test-lib.sh
index 7c2a8ba77d312c3196767969a39687bfb12f74c9..d7ad13b95525886b45ddd3c22fcbf7a25f61ebf2 100644 (file)
--- a/t/test-lib.sh
+++ b/t/test-lib.sh
@@ -160,6 +160,22 @@ die () {
 
 trap 'die' exit
 
+# The semantics of the editor variables are that of invoking
+# sh -c "$EDITOR \"$@\"" files ...
+#
+# If our trash directory contains shell metacharacters, they will be
+# interpreted if we just set $EDITOR directly, so do a little dance with
+# environment variables to work around this.
+#
+# In particular, quoting isn't enough, as the path may contain the same quote
+# that we're using. 
+test_set_editor () {
+       FAKE_EDITOR="$1"
+       export FAKE_EDITOR
+       VISUAL='"$FAKE_EDITOR"'
+       export VISUAL
+}
+
 test_tick () {
        if test -z "${test_tick+set}"
        then