Is there a way to transform / slurp a list of JSON values into an array ?
The idea is to replicate the functionality of -s / --slurp but for "internal" use.
When we iterate over the values of an array, we get a list of value. I would like to have a way to transform the list back into an array but without enclosing the expression with [ ], without using the array constructor.
I would like it to have the form of a filter. I already tried various things with reduce, foreach and bindings but it doesn't work
CodePudding user response：
No.
You're asking how to collect the outputs of a stream (list) using something of the form STREAM | .... Unfortunately, that's impossible.
When piping filter A into filter B as in A | B, and A happens to output a stream, then B is fed with each item of the stream separately, i.e. B runs as many times as there are items coming from A. Therefore no single execution of B will be able to see or collect all the (other) items of the stream.[1]
The code building the array must necessarily enclose STREAM.
[ STREAM ]reduce STREAM as $_ ( []; . [$_] )def array( s ): [ s ]; array( STREAM )ARRAY | map( STREAM )(An alternative to[ ARRAY | STREAM ].)- etc
For example,
jq --slurp .
can also be written as
jq --null-input '[ inputs ]'
But there's nothing equivalent that has the following form:
jq '...'
In short, you have an XY Problem.
- Courtesy of @pmf