#!/bin/bash
#
# A hook script to verify that no filenames with capital letters are committed.
# Called by "git commit" with no arguments.  The hook should
# exit with non-zero status after issuing an appropriate message if
# it wants to stop the commit.
#
# Go through all the changed files (except for deleted and unmerged)

# Save exit code of last executed action
exit_code=0

# Check if file is one of SAS|DDL|CSV|SH and check for uppercase letters
mime_pattern="\.(sas|ddl|csv|sh)"
# Check for capital letters only in file names
extra_pattern="(^|/)[^/]*([A-Z]+)[^/]*\.[A-Za-z]{3}$"
# Grep git diff of files to commit
files=$(  git diff --cached --find-copies --find-renames --name-only --diff-filter=ACMRTXBU |
      grep -Ei "$mime_pattern" |
      grep -E  "$extra_pattern" )
echo "$files"
if [[ -n "$files"  ]];
then
  echo
  echo "Found files that contain capital letters."
  echo "Please rename the following files in lowercase, and commit again:"

  for file in $files; do
    echo -e '- \E[0;32m'"$file"'\033[0m'
  done
  # Abort commit
  exit_code=1
fi

if [ "$exit_code" == "0" ]; then
  echo
  echo -e '\033[1m'"Pre-commit validation Passed"'\033[0m'
  echo
else
  echo
  echo -e '\033[1m'"Commit Aborted!"'\033[0m'
  echo
fi
exit $exit_code