threads / patch / 36925

patchCoding guideline for Error messages

Subject: [PATCH] Coding guideline for Error messages

## tl;dr

8 messages between Jun 16, 2014 and Jul 15, 2014. Diffs are folded; open one to read it.

replies: 7people: 3as markdown or json

Philip Oakley· Jun 16, 2014, 12:55 UTC · lore

A recent review comment highlighted the current view on error message punctuation. I thought it worth recording.

In the past I've also seen guidance on the error message style. This patch also gives a place for recording such guidance, for example, ensuring that the message is useful to the user, rather than referring to some internal technical issue. I haven't looked deeply for those yet.

Philip Oakley (1):
  doc: State coding guideline for error message punctuation
 Documentation/CodingGuidelines | 7 +++++++
 1 file changed, 7 insertions(+)
-- 
1.9.4.msysgit.0
Philip Oakley· Jun 16, 2014, 12:55 UTC · re: Philip Oakley · lore

[PATCH] doc: State coding guideline for error message punctuation

Clarify error message puntuation to reduce review workload [1].

[1] http://article.gmane.org/gmane.comp.version-control.git/251547 (see trailing 'nit' item).

Signed-off-by: Philip Oakley <philipoakley@iee.org>
---
 Documentation/CodingGuidelines | 7 +++++++
 1 file changed, 7 insertions(+)
Show changes to Documentation/CodingGuidelines +7 −0
diff --git a/Documentation/CodingGuidelines b/Documentation/CodingGuidelines
index 4d90c77..b2f3442 100644
--- a/Documentation/CodingGuidelines
+++ b/Documentation/CodingGuidelines
@@ -404,6 +404,13 @@ For Python scripts:
    documentation for version 2.6 does not mention this prefix, it has
    been supported since version 2.6.0.
 
+Error Messages
+
+ - We typically do not end error messages with a full stop. While
+   we've been rather inconsistent in the past, these days we mostly
+   settle on no punctuation.
+
+
 Writing Documentation:
 
  Most (if not all) of the documentation pages are written in the
-- 
1.9.4.msysgit.0
Junio C Hamano· Jun 16, 2014, 18:52 UTC · re: Philip Oakley · lore

Re: [PATCH] doc: State coding guideline for error message punctuation

Philip Oakley <philipoakley@iee.org> writes:
Show 7 quoted lines
> Clarify error message puntuation to reduce review workload [1].
>
> [1] http://article.gmane.org/gmane.comp.version-control.git/251547
> (see trailing 'nit' item).
>
> Signed-off-by: Philip Oakley <philipoakley@iee.org>
> ---
Hmmm.  Do we really need to spell everything out?

I would rather hope that we can rely on our contributors to know Git well enough to ask "git grep" after reading the "follow the style of existing and surrounding code" rule that governs the overall guideline.

Show 21 quoted lines
>  Documentation/CodingGuidelines | 7 +++++++
>  1 file changed, 7 insertions(+)
>
> diff --git a/Documentation/CodingGuidelines b/Documentation/CodingGuidelines
> index 4d90c77..b2f3442 100644
> --- a/Documentation/CodingGuidelines
> +++ b/Documentation/CodingGuidelines
> @@ -404,6 +404,13 @@ For Python scripts:
>     documentation for version 2.6 does not mention this prefix, it has
>     been supported since version 2.6.0.
>  
> +Error Messages
> +
> + - We typically do not end error messages with a full stop. While
> +   we've been rather inconsistent in the past, these days we mostly
> +   settle on no punctuation.
> +
> +
>  Writing Documentation:
>  
>   Most (if not all) of the documentation pages are written in the
Philip Oakley· Jun 16, 2014, 19:57 UTC · re: Junio C Hamano · lore

Re: [PATCH] doc: State coding guideline for error message punctuation

From: "Junio C Hamano" <gitster@pobox.com>
Show 11 quoted lines
> Philip Oakley <philipoakley@iee.org> writes:
>
>> Clarify error message puntuation to reduce review workload [1].
>>
>> [1] http://article.gmane.org/gmane.comp.version-control.git/251547
>> (see trailing 'nit' item).
>>
>> Signed-off-by: Philip Oakley <philipoakley@iee.org>
>> ---
>
> Hmmm.  Do we really need to spell everything out?

It was more of a case of 'do we often have to provide this guidance in reviews'? The trailing full stop does appear to come up moderately often, along with other punctuation issues. I am on the 'guidance of the wise and education of others' side of the camp, rather than they being rules and regulations (as was recently misunderstood), so lets educate.

I haven't yet had the time to search deeply, but I'm sure I've also seen various bits of guidance on suitability and style of error messages in the last year of so that the section can be rounded out on that front as well (no doubt similar to some of the commit message guidance).

Show 5 quoted lines
>
> I would rather hope that we can rely on our contributors to know Git
> well enough to ask "git grep" after reading the "follow the style of
> existing and surrounding code" rule that governs the overall
> guideline.

I don't see error messages as "code" per se, rather as an attempt at a consistent user interface[*], and the user errors can come from anywhere, so if we have settled on a style, let's say so.

Philip

[*] My distinction here: "code" is a developer interface, "commands and error messages" is the UI.

Show 29 quoted lines
>
>>  Documentation/CodingGuidelines | 7 +++++++
>>  1 file changed, 7 insertions(+)
>>
>> diff --git a/Documentation/CodingGuidelines 
>> b/Documentation/CodingGuidelines
>> index 4d90c77..b2f3442 100644
>> --- a/Documentation/CodingGuidelines
>> +++ b/Documentation/CodingGuidelines
>> @@ -404,6 +404,13 @@ For Python scripts:
>>     documentation for version 2.6 does not mention this prefix, it 
>> has
>>     been supported since version 2.6.0.
>>
>> +Error Messages
>> +
>> + - We typically do not end error messages with a full stop. While
>> +   we've been rather inconsistent in the past, these days we mostly
>> +   settle on no punctuation.
>> +
>> +
>>  Writing Documentation:
>>
>>   Most (if not all) of the documentation pages are written in the
> --
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Jeff King· Jun 17, 2014, 09:37 UTC · re: Philip Oakley · lore

Re: [PATCH] doc: State coding guideline for error message punctuation

On Mon, Jun 16, 2014 at 01:55:57PM +0100, Philip Oakley wrote:
Show 5 quoted lines
> +Error Messages
> +
> + - We typically do not end error messages with a full stop. While
> +   we've been rather inconsistent in the past, these days we mostly
> +   settle on no punctuation.

Unlike Junio, I do not mind spelling out guidance for error messages. However, I do not think the second sentence is adding anything here (everything in CodingGuidelines is subject to "we did not always do it this way, but this is the preferred way now"). So I'd drop it.

And then add in more guidance. Besides "no full stop", probably:
  1. do not capitalize ("unable to open %s", not "Unable to open %s"
  2. maybe something on sentence structure / ordering? We tend to prefer
     "cannot open 'foo': No such file or directory" to "foo: cannot
     open: No such file or directory".

Perhaps there are others (we do not have to be exhaustive, but it makes sense to think for a moment while we are here).

-Peff
Junio C Hamano· Jul 10, 2014, 20:36 UTC · re: Jeff King · lore

Re: [PATCH] doc: State coding guideline for error message punctuation

Jeff King <peff@peff.net> writes:
Show 23 quoted lines
> On Mon, Jun 16, 2014 at 01:55:57PM +0100, Philip Oakley wrote:
>
>> +Error Messages
>> +
>> + - We typically do not end error messages with a full stop. While
>> +   we've been rather inconsistent in the past, these days we mostly
>> +   settle on no punctuation.
>
> Unlike Junio, I do not mind spelling out guidance for error messages.
> However, I do not think the second sentence is adding anything here
> (everything in CodingGuidelines is subject to "we did not always do it
> this way, but this is the preferred way now"). So I'd drop it.
>
> And then add in more guidance. Besides "no full stop", probably:
>
>   1. do not capitalize ("unable to open %s", not "Unable to open %s"
>
>   2. maybe something on sentence structure / ordering? We tend to prefer
>      "cannot open 'foo': No such file or directory" to "foo: cannot
>      open: No such file or directory".
>
> Perhaps there are others (we do not have to be exhaustive, but it makes
> sense to think for a moment while we are here).

I do not want to forever be waiting for a reroll, so let's queue this and advance it to 'next' soonish, and refine the guidelines by further building on top of it as needed.

Thanks.
-- >8 --
From: Philip Oakley <philipoakley@iee.org>
Date: Mon, 16 Jun 2014 13:55:57 +0100
Subject: [PATCH] doc: give some guidelines for error messages
Clarify error message puntuation to reduce review workload.
Signed-off-by: Philip Oakley <philipoakley@iee.org>
Helped-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
---
 Documentation/CodingGuidelines | 9 +++++++++
 1 file changed, 9 insertions(+)
Show changes to Documentation/CodingGuidelines +9 −0
diff --git a/Documentation/CodingGuidelines b/Documentation/CodingGuidelines
index f424dbd..f4137c6 100644
--- a/Documentation/CodingGuidelines
+++ b/Documentation/CodingGuidelines
@@ -264,6 +264,15 @@ For Python scripts:
    documentation for version 2.6 does not mention this prefix, it has
    been supported since version 2.6.0.
 
+Error Messages
+
+ - Do not end error messages with a full stop.
+
+ - Do not capitalize ("unable to open %s", not "Unable to open %s")
+
+ - Say what the error is first ("cannot open %s", not "%s: cannot open")
+
+
 Writing Documentation:
 
  Most (if not all) of the documentation pages are written in the
-- 
2.0.1-751-ge540734
Jeff King· Jul 10, 2014, 20:42 UTC · re: Junio C Hamano · lore

Re: [PATCH] doc: State coding guideline for error message punctuation

On Thu, Jul 10, 2014 at 01:36:05PM -0700, Junio C Hamano wrote:
Show 6 quoted lines
> > Perhaps there are others (we do not have to be exhaustive, but it makes
> > sense to think for a moment while we are here).
> 
> I do not want to forever be waiting for a reroll, so let's queue
> this and advance it to 'next' soonish, and refine the guidelines by
> further building on top of it as needed.
Yes, that looks good to me. Thanks for moving this forward.
-Peff
Philip Oakley· Jul 15, 2014, 19:28 UTC · re: Junio C Hamano · lore

Re: [PATCH] doc: State coding guideline for error message punctuation

From: "Junio C Hamano" <gitster@pobox.com>
Sent: Thursday, July 10, 2014 9:36 PM
Show 33 quoted lines
> Jeff King <peff@peff.net> writes:
>
>> On Mon, Jun 16, 2014 at 01:55:57PM +0100, Philip Oakley wrote:
>>
>>> +Error Messages
>>> +
>>> + - We typically do not end error messages with a full stop. While
>>> +   we've been rather inconsistent in the past, these days we mostly
>>> +   settle on no punctuation.
>>
>> Unlike Junio, I do not mind spelling out guidance for error messages.
>> However, I do not think the second sentence is adding anything here
>> (everything in CodingGuidelines is subject to "we did not always do 
>> it
>> this way, but this is the preferred way now"). So I'd drop it.
>>
>> And then add in more guidance. Besides "no full stop", probably:
>>
>>   1. do not capitalize ("unable to open %s", not "Unable to open %s"
>>
>>   2. maybe something on sentence structure / ordering? We tend to 
>> prefer
>>      "cannot open 'foo': No such file or directory" to "foo: cannot
>>      open: No such file or directory".
>>
>> Perhaps there are others (we do not have to be exhaustive, but it 
>> makes
>> sense to think for a moment while we are here).
>
> I do not want to forever be waiting for a reroll, so let's queue
> this and advance it to 'next' soonish, and refine the guidelines by
> further building on top of it as needed.
>

Sorry, I've been away on vacation for the last few weeks. I hadn't been sure what to include in a re-roll without it gaining too much mission creep.

Thanks for keeping an eye on it.
Show 41 quoted lines
> Thanks.
>
> -- >8 --
> From: Philip Oakley <philipoakley@iee.org>
> Date: Mon, 16 Jun 2014 13:55:57 +0100
> Subject: [PATCH] doc: give some guidelines for error messages
>
> Clarify error message puntuation to reduce review workload.
>
> Signed-off-by: Philip Oakley <philipoakley@iee.org>
> Helped-by: Jeff King <peff@peff.net>
> Signed-off-by: Junio C Hamano <gitster@pobox.com>
> ---
> Documentation/CodingGuidelines | 9 +++++++++
> 1 file changed, 9 insertions(+)
>
> diff --git a/Documentation/CodingGuidelines 
> b/Documentation/CodingGuidelines
> index f424dbd..f4137c6 100644
> --- a/Documentation/CodingGuidelines
> +++ b/Documentation/CodingGuidelines
> @@ -264,6 +264,15 @@ For Python scripts:
>    documentation for version 2.6 does not mention this prefix, it has
>    been supported since version 2.6.0.
>
> +Error Messages
> +
> + - Do not end error messages with a full stop.
> +
> + - Do not capitalize ("unable to open %s", not "Unable to open %s")
> +
> + - Say what the error is first ("cannot open %s", not "%s: cannot 
> open")
> +
> +
> Writing Documentation:
>
>  Most (if not all) of the documentation pages are written in the
> -- 
> 2.0.1-751-ge540734
> 

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