#!/bin/sh

# This is a pre-commit hook that ensures attempts to commit files that are
# are larger than $limit to your _local_ repo fail, with a helpful error message.

# Maximum file size limit in bytes
limit=5000000 # 5MB
limitInMB=$(( $limit / 10**6 ))

# Move to the repo root so git files paths make sense
repo_root=$( git rev-parse --show-toplevel )
cd $repo_root

empty_tree=$( git hash-object -t tree /dev/null )

if git rev-parse --verify HEAD > /dev/null 2>&1
then
	against=HEAD
else
	against="$empty_tree"
fi

# Set split so that for loop below can handle spaces in file names by splitting on line breaks
IFS='
'

echo "Checking staged file sizes"
shouldFail=false
for file in $( git diff-index --cached --name-only $against ); do
	file_size=$( ls -la $file | awk '{ print $5 }')
	if [ "$file_size" -gt  "$limit" ]; then
	    echo File $file is $(( $file_size / 10**6 )) MB, which is larger than our configured limit of $limitInMB MB
        shouldFail=true
	fi
done

if $shouldFail
then
    echo If you really need to commit this file, you can push with the --no-verify switch, but the file should definitely, definitely be under 10MB!!!
	  echo Commit aborted
    exit 1;
fi