prettier_diff.sh

#!/usr/bin/env bash

# Diffs changelist to correct prettier format
#
# You can apply the prettier patch from this output
# xclip -out | git apply -
# pbpaste | git apply -
# cat /dev/clipboard | git apply -

git_root=$(git rev-parse --show-toplevel)
files_in_commit=$(git diff-index --name-only --diff-filter=ACMR HEAD -- )
prettier="$git_root/node_modules/.bin/prettier"
prettier_success=0

result=$(( result + $? ))
cd "$git_root" || exit
for file in $files_in_commit; do
  # psuedo:  prettier_format | git_diff | fix_filenames_for_patch_output
  # shellcheck disable=SC2002
  cat "$file" | "$prettier" --stdin-filepath "$file"\
    | git --no-pager diff --color --no-index -- "$file" - \
    | sed "s/b\/-/b\/${file//\//\\/}/g"

  if [ "${PIPESTATUS[2]}" -ne "0" ]; then
    prettier_success=1
  fi

  # gnu diff also works
  # diff --color -u "$file" <(cat "$file" | "$prettier" --stdin-filepath "$file")
done

exit $prettier_success