Re: [PATCH] Simple update to bash completions to prevent unbound variable errors.

From: Ted Pavlic <ted@tedpavlic.com>
Date: Jan 13, 2009, 04:30 UTC
Message-ID: <496C18D8.9070707@tedpavlic.com>
In-Reply-To: <7vy6xfew2n.fsf@gitster.siamese.dyndns.org>

>> A vim modeline has also been added for consistency.
>
> Yuck.

Better that than have a mixture of spaces and tabs.

>> +# __git_ps1 accepts 0 or 1 arguments (i.e., format string)
>> +# returns text to add to bash PS1 prompt (includes branch name)
>
> Good.  Would be better if you described what $1 and $2 mean.

In that case, there's only $1 (the format string).

Note that in most cases, I didn't know what $1 and $2 were. I was just trying to fix it so that it would work on my system.

Show 6 quoted lines

>> -		if [ -n "$1" ]; then
>> +		if [ $# -gt 0 ]&&  [ -n "$1" ]; then
>
> I found the previous round's [ -n "${1-}" ] much easier to read, if we were to
> do this.  If -n "${1-}", then "$1" is definitely set so nothing need to
> change in the then ... else part.

Hey -- I agree, but no one else liked ${1-}. And hg's bash completion seems far superior because they avoid ever having to worry about it. They actually thought about the arguments ahead of time.

>> +# __gitcomp_1 requires 2 arguments
>
> ... and $1 and $2 mean?

No clue. Patches are welcome.

> Yuck.  If you are taking advantage of the fact that "local one"
> will bind one to emptiness anyway, can't you do something like:
>
> 	local one=${1-} two=${2-} cur=${3-} four=${4-}

Why even use one, two three, and four then?

I had ${#-} throughout, but I was told that that was ugly. So the best I could do was come up with the above mess.

--Ted

-- 
Ted Pavlic <ted@tedpavlic.com>

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