Git hooks: pre-commit

pre-commit

#! /bin/bash
# If you encounter any error like `declare: -A: invalid option`
# then you'll have to upgrade bash version to v4.
# For Mac OS, see http://clubmate.fi/upgrade-to-bash-4-in-mac-os-x/

# Hash using its key as a search Regex, and its value as associated error message
declare -A PATTERNS;
PATTERNS['^[<>|=]{4,}']="You've got leftover conflict markers";
PATTERNS['focus:\s*true']="You've got a focused spec";

# Declare empty errors array
declare -a errors;

# Loop over staged files and check for any specific pattern listed in PATTERNS keys
# Filter only added (A), copied (C), modified (M) files
for file in $(git diff --staged --name-only --diff-filter=ACM --no-color --unified=0); do
  for elem in ${!PATTERNS[*]} ; do
    { git show :0:"$file" | grep -Eq ${elem}; } || continue;
    errors+=("${PATTERNS[${elem}]} in ${file}…");
  done
done

# Print errors
# author=$(git config --get user.name)
for error in "${errors[@]}"; do
  echo -e "\033[1;31m${error}\033[0m"
  # Mac OS only: use auditable speech
  # which -s say && say -v Samantha -r 250 "$author $error"
done

# If there is any error, then stop commit creation
if ! [ ${#errors[@]} -eq 0 ]; then
  exit 1
fi