git-pre-commit-hook-django-migrations for bash

git-pre-commit-hook-django-migrations.sh

#!/usr/bin/env bash

previous_module=''
previous_filepath=''
previous_prefix=''
status_code="0"

for filepath in $(git ls-files -- $(find . -type f -regex '.*\migrations.*\.py$')); do
    module=${filepath%%/*}
    if [ "$previous_module" != "$module" ]; then
        previous_module="$module"
    fi

    file=${filepath##*/}
    prefix=${file%%_*}
    if [ "$previous_module" == "$module" ]; then
        if [ "$previous_prefix" == "$prefix" ]; then
            echo ""
            echo "Possible duplication:"
            echo "  $previous_filepath"
            echo "  $filepath"
            status_code="1"
        fi
    fi
    previous_prefix="$prefix"
    previous_filepath="$filepath"
done

if [ "$status_code" -ne "0" ]; then
  exit 1
fi