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wwader

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Jaq 2.0 released with lots of improvements and support for jqjq

github.com
2 points·by wwader·2 года назад·0 comments

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wwader
·3 месяца назад·discuss
Assume input is an array you can do it several ways depending on what you want:

    # output each value in the array separately 
    .[]

    # output each value but transform it in some way
    .[] | . * 2


    # map each value into a new array
    map(. * 2) 

    # same as above but manual iterate/collect
    [.[] | . * 2]
wwader
·11 месяцев назад·discuss
Same! and jq's regexp functions are quite powerful for transforming text into something more structured:

  $ echo -e "10:20: hello\n20:39: world" | jq -cR 'capture("^(?<timestamp>.*): (?<message>.*)$")'
  {"timestamp":"10:20","message":"hello"}
  {"timestamp":"20:39","message":"world"}


  $ echo -e "10:20: hello\n20:39: world" | jq -Rn '[inputs | capture("(?<t>.*): (?<m>.*)$").m] | join(" ")'
  "hello world"
Also using inputs/0 etc in combination with reduce and foreach it's possible to process streams of text that might not end.
wwader
·в прошлом году·discuss
Very nice! thanks for building this
wwader
·в прошлом году·discuss
The jaq author is working on a formal specification of jq https://github.com/01mf02/jq-lang-spec. I think it has also help that there are several implementations of jq now like, gojq, jaq and jqjq, that has helped finding edge cases and weird behaviours.
wwader
·в прошлом году·discuss
The sqlite source includes a CLI tool called showdb that is quite nice for poking around in database files
wwader
·2 года назад·discuss
Note on (b): As i understand it JSONPath by design is limited to only be able to select things from the input, so can't build a new object, array etc.
wwader
·2 года назад·discuss
open -a is nice, i use it with alias, ex:

  alias qt='open -a "quicktime player"'
  alias vlc='open -a "vlc"'
wwader
·2 года назад·discuss
Yeap the syntax and semantics is quite different to other languages and it really took me a long time and deep understanding to really appreciate how expressive and damn well designed it is.
wwader
·2 года назад·discuss
As a heavy jq user and now a days also maintainer i say welcome! happy to help if you run into some problem
wwader
·2 года назад·discuss
Yeap love things like that, ex https://www.imdb.com/title/tt1787791/ and the mystery show podcast. Let me know if you know any!
wwader
·2 года назад·discuss
Reminds me of the documentary Kim's video https://www.imdb.com/title/tt24132144/ recommended!