How to populate value with input-CodePudding

From a composer.lock I am creating json output of some fields, like this:

 <composer.lock jq  '.packages[] | {site: "foo", name: .name, version: .version, type: .type}' | jq -s

It works fine:

  {
    "site": "foo",
    "name": "webmozart/path-util",
    "version": "2.3.0",
    "type": "library"
  },
  {
    "site": "foo",
    "name": "webonyx/graphql-php",
    "version": "v14.9.0",
    "type": "library"
  }

but now I want to add a generated value, using uuidgen, but I can't figure out how to do that.

End result would be something like:

  {
    "site": "foo",
    "name": "webmozart/path-util",
    "version": "2.3.0",
    "type": "library",
    "uuid": "c4e97c3c-147d-4360-a601-6b4f6f5e71bb"
  },
  {
    "site": "foo",
    "name": "webonyx/graphql-php",
    "version": "v14.9.0",
    "type": "library",
    "uuid": "6fbe472b-49fe-4064-93f0-09a18a7e1c24"
  }

I think I should use input, but all I tried so far have failed.

CodePudding user response：

If your shell supports process substitution, you can avoid a two-pass solution as follows:

jq -nR  --argfile input composer.lock '
  $input 
  | .packages[]  
  | {site: "foo", name: .name, version: .version, type: .type, id: input}
 ' < <(while true; do uuidgen; done)

CodePudding user response：

Here's one possibility that does not require your shell to support "process substitution" but which entails two passes, the first for determining the number of UUIDs that are required:

# Syntax: generate N
function generate {
    for ((i=0; i<$1; i  )) ; do
    uuidgen
    done
}    

generate $( <composer.lock jq '.packages|length') | 
  jq -nR --argfile input composer.lock  '
    ($input 
    | .packages[]
    | {site: "foo", name: .name, version: .version, type: .type,
       id: input})'