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| #!/bin/sh -- | |
| # \ | |
| exec jq --unbuffered --stream -rn --args -f "$0" -- "$@" | |
| $ARGS.positional | | |
| if length != 1 then | |
| @json "Invalid arguments: \(.).\n" | halt_error(2) | |
| else . end | | |
| ( | |
| .[0] | | |
| try ( | |
| tonumber | |
| ) catch ( | |
| @json "Not a number: \($ARGS.positional[0]).\n" | halt_error(2) | |
| ) | | |
| if . <= 0 then | |
| "The argument must be positive; it was: \(.).\n" | halt_error(2) | |
| else . end | |
| ) as $n | | |
| def or_if_empty(f; if_empty): | |
| . as $dot | | |
| [ f ] | | |
| if length == 0 | |
| then $dot | if_empty | |
| else .[] | |
| end; | |
| try repeat( | |
| reduce range($n) as $i ([]; | |
| . + [ | |
| . as $dot | | |
| or_if_empty(first(inputs); | |
| error(.)) | | |
| until(. != [ [], [] ] and any(., .[0]; length != 1); | |
| or_if_empty(first(inputs); | |
| error($dot))) | | |
| if .[0][0] | type != "number" | |
| then @json "Unexpected input: \(.).\n" | halt_error(4) | |
| else . end | | |
| if length == 2 and (.[0] | length == 1) then | |
| .[1] | |
| else | |
| fromstream( | |
| . as $dot | | |
| 1 | truncate_stream( | |
| $dot | | |
| label $recurse | | |
| recurse(input) | | |
| ., | |
| (select(length == 1 and (.[0] | length == 2)) | | |
| break $recurse) | |
| ) | |
| ) | |
| end | |
| ] | |
| ) | |
| ) catch ( | |
| select(. != []) | |
| ) | | |
| tojson |
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