[ic] Usertag return value
emailgrant at gmail.com
Wed Feb 11 20:37:08 UTC 2009
>>>> > but that kills the whole page. What is the correct way to do this
>>>> > so I can evaluate whether or not the tag executed properly?
>>>> You could use exceptions with an Interchange [try] block (see
>>>> etc/log_transaction for an example), but I think a simple return
>>>> value would suffice in this case. If you want a "0" return value when
>>>> one or more of the sizes fails, then use a return value variable and
>>>> only set it to true if all three succeed.
>>> Right, there's a bunch of ways to do this, depending on
>>> whether you want to know which one failed (and exit immediately),
>>> or you want to run all three anyway and just indicate the exit
>>> status more as an information than an error.
>>> If you want to exit immediately when one fails, use i.e.:
>>> do_resize(....) or return 0;
>> I'm getting strange results from this now. My usertag is set up like this:
>> write-file1 or return 0;
>> write-file2 or return 0;
>> write-file3 or return 0;
>> The usertags exits and returns 0, the first 2 write-file commands
>> execute, and none of the chmod-file commands execute. If I remove the
>> "or return 0;" portions, everything executes perfectly. Does that
>> make sense to anyone?
> Do you have a 'return 1;' after the chmod-file3?
I just added it to the end of the usertag but I get the same result.
>> - Grant
>>> (The above assumes do_resize() indicates success with non-zero value.
>>> If it instead indicates failure with non-zero value, replace "or" with
>>> Another approach, if you want to run all three always, and just use
>>> exit status as an information to see which one(s) failed:
>>> $ret= 0;
>>> do_resize1(...) or $ret+= 1;
>>> do_resize2(...) or $ret+= 2;
>>> do_resize3(...) or $ret+= 4;
>>> return $ret;
>>> So if the tag exits with 0, it worked. Otherwise, the exit
>>> status will be a sum of all resizes that failed. I.e. if
>>> exit value is 5, it means resizes 1 and 3 failed.
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