BASH: dead simple syntax highlighting for docker compose config yaml output

compose-config-colored.sh

#!/usr/bin/env bash
#============================================================================
# dead simple syntax highlighting for docker compose config yaml output
#----------------------------------------------------------------------------

function ansi::sgr { echo -n $'\033'"[$(IFS=';'; echo "$*")m"; }
function ansi::str { while (( $# > 1 )); do ansi::sgr $1; echo -n "$2";shift 2; done; ansi::sgr; }

#----------------------------------------------------------------------------

docker compose config | sed -nr \
  "s/^(\s*)(-\s*)?(\S+)(:[| {}]*)(([^\"]*)|\"(([-0-9]+)|(.+))\")$/\1$(
    ansi::str 90 '\2' '38;5;172' '\3' 90 '\4' \
      32 '\6' 36 '\8' 94 '\9/;s/^(.*)$/' 37 '\1'
  )/p"

#----------------------------------------------------------------------------