Is it possible to insert an element into a middle of array in YAML using YQ?

Question

I have a YAML document like this

    
services:
  - name: newlogd
    image: NEWLOGD_TAG
    cgroupsPath: /eve/services/newlogd
    oomScoreAdj: -999
  - name: edgeview
    image: EDGEVIEW_TAG
    cgroupsPath: /eve/services/eve-edgeview
    oomScoreAdj: -800
  - name: debug
    image: DEBUG_TAG
    cgroupsPath: /eve/services/debug
    oomScoreAdj: -999
  - name: wwan
    image: WWAN_TAG
    cgroupsPath: /eve/services/wwan
    oomScoreAdj: -999

I need to insert a new object AFTER given element e.g. with name == "edgeview". so the output looks like this

services:
  - name: newlogd
    image: NEWLOGD_TAG
    cgroupsPath: /eve/services/newlogd
    oomScoreAdj: -999
  - name: edgeview
    image: EDGEVIEW_TAG
    cgroupsPath: /eve/services/eve-edgeview
    oomScoreAdj: -800
  - name: new_element_name
    image: new_element_image
  - name: debug
    image: DEBUG_TAG
    cgroupsPath: /eve/services/debug
    oomScoreAdj: -999
  - name: wwan
    image: WWAN_TAG
    cgroupsPath: /eve/services/wwan
    oomScoreAdj: -999

I couldn't find anything about it in YQ documentation. Is it even possible using YQ?

UPDATE: I'm using YQ https://github.com/mikefarah/yq version 4.28.1. I was not aware that there several tools with the same name.

Answer 1

Using the YAML processor yq:

yq --arg insertAfter edgeview -y '
   limit(1; .services | to_entries[] | select(.value.name == $insertAfter) | .key + 1) as $idx
   | .services |= .[0:$idx] +
                  [{name: "new_element_name", image: "new_element_image"}] +
                  .[$idx:]'

In the first line, the index of the element to be inserted after is determined and stored into $idx. If you have several elements with the same name, only the first match is used (limit). In the following filter step, $idx is used to split the array and insert the new element at the desired position.

Output

services:
  - name: newlogd
    image: NEWLOGD_TAG
    cgroupsPath: /eve/services/newlogd
    oomScoreAdj: -999
  - name: edgeview
    image: EDGEVIEW_TAG
    cgroupsPath: /eve/services/eve-edgeview
    oomScoreAdj: -800
  - name: new_element_name
    image: new_element_image
  - name: debug
    image: DEBUG_TAG
    cgroupsPath: /eve/services/debug
    oomScoreAdj: -999
  - name: wwan
    image: WWAN_TAG
    cgroupsPath: /eve/services/wwan
    oomScoreAdj: -999