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From: Junio C Hamano <gitster@pobox.com>
To: Rohit Ashiwal <rohit.ashiwal265@gmail.com>
Cc: Johannes.Schindelin@gmx.de, christian.couder@gmail.com,
	git@vger.kernel.org, t.gummerer@gmail.com
Subject: Re: [GSoC][PATCH v2 1/3] test functions: add function `test_file_not_empty`
Date: Mon, 04 Mar 2019 12:45:25 +0900	[thread overview]
Message-ID: <xmqqo96rxpyi.fsf@gitster-ct.c.googlers.com> (raw)
In-Reply-To: 20190303233750.6500-2-rohit.ashiwal265@gmail.com

Rohit Ashiwal <rohit.ashiwal265@gmail.com> writes:

> test-lib-functions: add a helper function that checks for a file and that
> the file is not empty. The helper function will provide better error message
> in case of failure and improve readability

Avoid making the log message into an enumerated list, when there
aren't that many things to enumerate to begin with (specifically,
the "test-lib-functions:" label is unsightly here).   Finish the
sentence with a full stop.

	Add a helper function to ensure that a given path is a
	non-empty file, and give an error message when it is not.

	Give separate messages for the case when the path is missing
	or a non-file, and for the case when the path is a file but
	is empty.

should be sufficient.

I still do not see why the posted code is better than this

	if ! test -s "$1"
	then
		echo "'$1' is not a non-empty file.'
	fi
 
which is more to the point.  After all, if we are truly aiming for
finer-grained diagnosis, there is no good reason to accept a single
error message "does not exist or not a file" for these two cases,
but you'd be writing more like

	if ! test -e "$1"
	then
		echo "'$1' does not exist"
	elif ! test -f "$1"
	then
		echo "'$1' is not a file"
	elif ! test -s "$1"
	then
		echo "'$1' is not empty"
	else
		: happy
		return
	fi
	false

But I do not see much point in doing so, and I do not see much point
in the version that makes an extra check only for "test -f", either.

> diff --git a/t/test-lib-functions.sh b/t/test-lib-functions.sh
> index 80402a428f..f9fcd2e013 100644
> --- a/t/test-lib-functions.sh
> +++ b/t/test-lib-functions.sh
> @@ -593,6 +593,21 @@ test_dir_is_empty () {
>  	fi
>  }
>  
> +# Check if the file exists and has a size greater than zero
> +test_file_not_empty () {
> +	if ! test -f "$1"
> +	then
> +		echo "'$1' does not exist or not a file."
> +		false
> +	else
> +		if ! test -s "$1"
> +		then
> +			echo "'$1' is an empty file."
> +			false
> +		fi
> +	fi
> +}


If I were writing this, I'd dedent it by turning this into

	if ! test -f ...
	then
		echo ...
	elif ! test -s ...
	then
		echo ...
	else
		: happy
		return
	fi
	false

But as I said, I do not see much point in the extra "test -f", so
more likely this is what I would write, if I were doing this step
myself:

	if test -s "$1"
	then
		: happy
	else
		echo "'$1' is not a non-empty file"
		false
	fi

> +
>  test_path_is_missing () {
>  	if test -e "$1"
>  	then

  reply	other threads:[~2019-03-04  3:45 UTC|newest]

Thread overview: 37+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-03-03 12:28 [GSoC][PATCH 0/3] Use helper functions in test script Rohit Ashiwal
2019-03-03 12:28 ` [PATCH 1/3] test functions: Add new function `test_file_not_empty` Rohit Ashiwal
2019-03-03 13:20   ` Junio C Hamano
2019-03-03 13:29     ` Rohit Ashiwal
2019-03-03 13:33       ` none Junio C Hamano
2019-03-03 14:07         ` Clearing logic Rohit Ashiwal
2019-03-03 16:19           ` Thomas Gummerer
2019-03-03 12:28 ` [PATCH 2/3] t3600: refactor code according to contemporary guidelines Rohit Ashiwal
2019-03-03 13:30   ` Junio C Hamano
2019-03-03 14:13     ` t3600: refactor code according to comtemporary guidelines Rohit Ashiwal
2019-03-03 12:28 ` [PATCH 3/3] t3600: use helper functions from test-lib-functions Rohit Ashiwal
2019-03-03 13:32   ` Junio C Hamano
2019-03-03 23:37 ` [GSoC][PATCH v2 0/3] Use helper functions in test script Rohit Ashiwal
2019-03-03 23:37   ` [GSoC][PATCH v2 1/3] test functions: add function `test_file_not_empty` Rohit Ashiwal
2019-03-04  3:45     ` Junio C Hamano [this message]
2019-03-03 23:37   ` [GSoC][PATCH v2 2/3] t3600: restructure code according to contemporary guidelines Rohit Ashiwal
2019-03-04  4:17     ` Junio C Hamano
2019-03-03 23:37   ` [GSoC][PATCH v2 3/3] t3600: use helpers to replace test -d/f/e/s <path> Rohit Ashiwal
2019-03-04 12:07 ` [GSoC][PATCH v3 0/3] Use helper functions in test script Rohit Ashiwal
2019-03-04 12:07   ` [GSoC][PATCH v3 1/3] test functions: add function `test_file_not_empty` Rohit Ashiwal
2019-03-05  0:17     ` Eric Sunshine
2019-03-05 12:43       ` Junio C Hamano
2019-03-05 13:27       ` [GSoc][PATCH " Rohit Ashiwal
2019-03-04 12:08   ` [GSoC][PATCH v3 2/3] t3600: modernize style Rohit Ashiwal
2019-03-05  0:36     ` Eric Sunshine
2019-03-05 12:44       ` Junio C Hamano
2019-03-04 12:08   ` [GSoC][PATCH v3 3/3] t3600: use helpers to replace test -d/f/e/s <path> Rohit Ashiwal
2019-03-05  0:42     ` Eric Sunshine
2019-03-05 13:42       ` Rohit Ashiwal
2019-03-05 14:03         ` Eric Sunshine
2019-03-05 14:21           ` [GSoC][PATCH v2 " Rohit Ashiwal
2019-03-05 14:57             ` Eric Sunshine
2019-03-05 23:38               ` Rohit Ashiwal
2019-03-08  5:38               ` [GSoC][PATCH v2 3/3] t3600: use helpers to replace test -d/f/e/s <path> Junio C Hamano
2019-03-08  9:51                 ` Eric Sunshine
2019-03-11  1:54                   ` Junio C Hamano
2019-03-05  0:09   ` [GSoC][PATCH v3 0/3] Use helper functions in test script Eric Sunshine

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