#!/bin/sh
# This git hook fails if a user is trying to add a new file which is
# not null safe.

# Check the contents of each file that is being added(A) or modified(N) or
# copied (C)
for file in `git diff --name-only --diff-filter=ACM --cached`; do
  # Ignore the hooks from any pre-commit check
  if echo "$file" | grep -q 'hooks/'; then
    continue
  fi
  # Get the contents of the newly added lines in the file
  newContent=`git diff --cached --unified=0 $file | grep '^+'`
  oldContent=`git diff --cached --unified=0 $file | grep '^-'`
  initialContent=`head -5 $file`

  # Check if user has added "// @dart=2.9" in the file
  if echo "$newContent" | grep -q '// @dart=2.9'; then
    echo "😡 File $file looks like a newly created file but it's not null-safe"
    exit 1
  elif echo "$oldContent" | grep -q '// @dart=2.9'; then
    echo "💚💚 Thank you for making $file null-safe"
    continue
  elif echo "$initialContent" | grep -q '// @dart=2.9'; then
    echo "🔥🔥🔥🔥 Please make $file null-safe"
    continue
  else
    continue
  fi
done

nullUnsafeFiles=$(grep  '// @dart=2.9' -r lib/ | wc -l)
# The xargs at the end is to trim whitepsaces https://stackoverflow.com/a/12973694/546896
echo "🥺🥺 $nullUnsafeFiles files are still waiting for their nullSafety migrator" | xargs

# If the script gets to this point, all files passed the check
exit 0