copyloopvar.sh

#!/usr/bin/env bash

# A hacky fixer for copyloopvar errors

go install github.com/karamaru-alpha/copyloopvar/cmd/copyloopvar@latest
cmd="sed"
if uname -s | grep Darwin; then
  cmd="gsed"
fi

declare -A visited

while IFS= read -r copy; do
  # file:line:indent: The copy of the 'for' variable "test" can be deleted (Go 1.22+)
  file=$(cut -d ":" -f 1 <<< "$copy")
  line=$(cut -d ":" -f 2 <<< "$copy")
  if ! [[ $line =~ ^[0-9]+$ ]]; then
    # Ignore non-useful output
    continue
  fi

  # Since our files likely have more than a single instance that needs to be updated we need
  # to track how often we visit the file so we can decrement the line index each time.
  # This relies on the fact that copyloopvar is output ordered.
  visited_times="${visited["$file"]}"
  (( decr="0" ))
  if [ "$visited_times" != "" ]; then
    (( decr="$visited_times" ))
  fi
  (( remove = line - decr ))

  echo $cmd -i "${remove}d" "$file"
  $cmd -i "${remove}d" "$file"
  (( visited["$file"]++ ))
done < <(go vet -vettool="$(which copyloopvar)" ./... 2>&1)