Get rubocop metrics details

metrics.sh

#!/usr/bin/env bash

# Example output:
#
# Metrics/PerceivedComplexity
# Min: 8  Max: 96 Average: 14.628342

cops=(
  Metrics/AbcSize
  Metrics/ClassLength
  Metrics/CyclomaticComplexity
  Metrics/LineLength
  Metrics/MethodLength
  Metrics/PerceivedComplexity
)

for cop in ${cops[@]}; do
  print "$cop"
  rubocop -f s --only "$cop" S '/^== /d' -e 's/.*\[([^\/]+).*/\1/' -e \$d -e '/^$/d' | awk 'NR == 1 { max=$1; min=$1; sum=0 } { if ($1>max) max=$1; if ($1<min) min=$1; sum+=$1;} END {printf "Min: %d\tMax: %d\tAverage: %f\n", min, max, sum/NR}' || echo 'fail'
done