Junio C Hamano <gitster@xxxxxxxxx> writes:
> As I already said, I think "better known" is much less of an issue
> than that "-a/-o" is "more error prone", and that is the reason why
> we may want to do this rewrite.
>
> I do not know offhand how busy the tree would be when we can apply
> these patches post-release without them getting rebased, but the
> zero-th step before this series may want to be a patch like this.
... and this time with a proposed log message.
-- >8 --
Subject: [PATCH] CodingGuidelines: avoid "test <cond> -a/-o <cond>"
The construct is error-prone; "test" being built-in in most modern
shells, the reason to avoid "test <cond> && test <cond>" spawning
one extra process by using a single "test <cond> -a <cond>" no
longer exists.
Signed-off-by: Junio C Hamano <gitster@xxxxxxxxx>
---
Documentation/CodingGuidelines | 13 +++++++++++++
1 file changed, 13 insertions(+)
diff --git a/Documentation/CodingGuidelines b/Documentation/CodingGuidelines
index 3d08671..4d90c77 100644
--- a/Documentation/CodingGuidelines
+++ b/Documentation/CodingGuidelines
@@ -151,6 +151,19 @@ For shell scripts specifically (not exhaustive):
interface translatable. See "Marking strings for translation" in
po/README.
+ - We do not write our "test" command with "-a" and "-o" and use "&&"
+ or "||" to concatenate multiple "test" commands instead, because
+ the use of "-a/-o" is often error-prone. E.g.
+
+ test -n "$x" -a "$a" = "$b"
+
+ is buggy and breaks when $x is "=", but
+
+ test -n "$x" && test "$a" = "$b"
+
+ does not have such a problem.
+
+
For C programs:
- We use tabs to indent, and interpret tabs as taking up to
--
2.0.0-rc3-438-g36dae77
--
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