Hi Martin;
What about two commands "*watch*" and "*watchif*"?
The first works as the "*var*" command and the second as the "*if*" command.
"*watch*" does:
1. In a function with *error* as an output (anywhere): returns in case
the *err* declared with *watch err* (or *watch myerror*) becomes
non-nil. *watch err* would declare *err*" as *var* does. Most use cases
would put *watch err* at the beginning of a function (although this is
optional as it is with *defer*)
2. In a test function; aka TestSomething(something *testing.T), *watch
err error* would declare *err* (or *watch myerror error*) and if an
error occurs, it would call something.FailNow() after (printing the error
message?---still need to think this part better)
3. In the main function: *watch err error* would print the error message
(or maybe pipe to stderr) and os.Exist(1)
4. *watchif err != nil {HERE}* would be more powerful because it would
allow us to do other things. But the mechanism is similar (as you proposed
initially): if *err* becomes non-nil anywhere, the execution in *HERE*
would take place.
Cheers!
On Tuesday, September 5, 2017 at 4:55:59 PM UTC+10,
marti...@programmfabrik.de wrote:
>
> Hi Dorival,
>
> thanks for supporting me with my idea.
>
> And yes, after writing my post yesterday I was thinking, "watchif" or even
> simply "watch".
>
> And yes, today I am more in favor of simply *"watch"*.
>
> And yes, we can constrain this to the context of one function (like
> defer), I am ok with that.
>
> What you are describing how you work with errors and how you spent hours
> adding
>
> *if err != nil*
>
> that is *exactly* my point.
>
> On could nicely write this
>
> ...
> watch err!=nil {
> handle_sql_error(err)
> }
> ...
>
> Of course, watch could also be used to not watch out for errors but any
> other places where new values to get assigned to variables.
>
> Martin
>
>>
>>>
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