"Column view": Support confining interpolated fields to a desired length #25
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- Very helpful if you're watching multiple fields that have a dynamic length and/or if you're interested in being able to view your logs in a truncated-columnar layout - Specifying a length after a field name reference is optional - It will truncate or pad to fit the string into the specified length e.g. $ elktail -f "%@timestamp[16] %msg[25] <- always the same length!" might print something like: 2017-05-06T17:47 ###.##.###.##:##### [06/May/2017:1 <- always the same length! 2017-05-06T17:47 ##.###.##.###:##### [06/May/2017:1 <- always the same length! 2017-05-06T17:47 ###.##.###.###:##### [06/May/2017: <- always the same length! 2017-05-06T17:47 ##.###.##.###:##### [06/May/2017:1 <- always the same length! 2017-05-06T17:47 ##.###.##.###:##### [06/May/2017:1 <- always the same length! 2017-05-06T17:47 ##.###.##.##:##### [06/May/2017:13 <- always the same length! 2017-05-06T17:47 ##.###.###.###:##### [06/May/2017: <- always the same length! 2017-05-06T17:47 ##.###.###.##:##### [06/May/2017:1 <- always the same length! 2017-05-06T17:47 ##.###.###.##:##### [06/May/2017:1 <- always the same length! 2017-05-06T17:47 ##.###.###.###:##### [06/May/2017: <- always the same length!
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This introduces a simple modifier to field references specified in the format string:
Adding a suffix of the form
[<integer>]will force the field value to be a stringof that length. The field value, whether it's blank, shorter, or longer than the
specified length will be of length
<integer>. The consequence is a columnar output.See commit message for a slightly longer explanation with a simple example.
I'm not entirely sure this fits a general desire and should be merged upstream,
but it fits a need that my organization has, and we'll be using it : )