Parsing and extracting values from array in jinja templates

color-templates.txt

----- We have an input_number sensor with the currently selected index -----
states.input_number.color_index_garden.state = 1.0

input_number:
  color_index_garden:
    name: Valgt farveindex i haven
    initial: 0
    max: 255
    min: 0

----- We have a file sensor with a list of colors in the state -----
states.sensor.colors_common.state = "[[255,240,200],[255,230,170],[255,220,140],[255,0,0],[255,127,0],[255,255,0],[127,255,0],[0,255,127],[0,127,255],[0,0,255],[127,0,255],[255,0,255],[255,0,127]]"

sensor:
  - platform: file
    name: Colors Common
    file_path: /config/www/files/colors_common.txt



----- Template playground -----
More clever way with regex:
Colors: {{ states.sensor.colors_common.state }}
Colors count: {{ states.sensor.colors_common.state.split("],") | count }}

{% set index_entity_id = "input_number.color_index_garden" %}
Current index: {{ states(index_entity_id) | int }}
Current color: {{ states.sensor.colors_common.state | regex_findall_index("(\[\d{1,3},\s?\d{1,3},\s?\d{1,3}\])", index=states(index_entity_id) | int) }}
Next index: {{ 0 if states(index_entity_id) | int + 1 > states.sensor.colors_common.state.split("],") | count - 1 else states(index_entity_id) | int + 1 }}
Previous index: {{ states.sensor.colors_common.state.split("],") | count - 1 if states(index_entity_id) | int - 1 < 0 else states(index_entity_id) | int - 1 }}




----- Scripts for next/previous -----
Script that handle button press for next/previous color

next_color:
  alias: Næste farve
  sequence:
    - service: input_number.set_value
      data_template:
        entity_id: input_number.color_index_garden
        value: '{{ 0 if(states.input_number.color_index_garden.state | int) + 1 > ((states.sensor.colors_common.state.split("],") | count) - 1) else (states.input_number.color_index_garden.state | int) + 1 }}'
    - service: light.turn_on
      data_template:
        entity_id: "{{ target_entity_id }}"
        rgb_color: '{{ states.sensor.colors_common.state | regex_findall_index("(\[\d{1,3},\s?\d{1,3},\s?\d{1,3}\])", index=(0 if(states.input_number.color_index_garden.state | int) + 1 > ((states.sensor.colors_common.state.split("],") | count) - 1) else (states.input_number.selected_index_garden.state | int) + 1)) }}'

previous_color:
  alias: forrige farve
  sequence:
    - service: input_number.set_value
      data_template:
        entity_id: input_number.color_index_garden
        value: '{{ ((states.sensor.colors_common.state.split("],") | count) - 1) if ((states.input_number.color_index_garden.state | int) - 1) < 0 else ((states.input_number.color_index_garden.state | int) - 1) }}'
    - service: light.turn_on
      data_template:
        entity_id: "{{ target_entity_id }}"
        rgb_color: '{{ states.sensor.colors_common.state | regex_findall_index("(\[\d{1,3},\s?\d{1,3},\s?\d{1,3}\])", index=((states.sensor.colors_common.state.split("],") | count) - 1) if ((states.input_number.color_index_garden.state | int) - 1) < 0 else ((states.input_number.selected_index_garden.state | int) - 1)) }}'



----- Example on buttons to page through colors -----

  - type: vertical-stack
    cards:
      - entity: light.garden
        type: entity-button
        name: "Have"
        icon_height: 40px
        hold_action:
          action: more-info
        tap_action:
          action: toggle
      - type: horizontal-stack
        cards:
          - entity: light.garden
            type: entity-button
            show_name: false
            icon: mdi:skip-backward
            icon_height: 30px
            tap_action:
              action: call-service
              service: script.previous_color
              service_data:
                target_entity_id: light.garden
          - entity: light.garden
            type: entity-button
            show_name: false
            icon: mdi:skip-forward
            icon_height: 30px
            tap_action:
              action: call-service
              service: script.next_color
              service_data:
                target_entity_id: light.garden