bootstrap/specs/mix/template/.githooks/pre-commit

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#!/usr/bin/env bash
set -e
STAGED=$(
git --no-pager diff --name-only --no-color --cached --diff-filter=d |
# Remove quotations used to surrounding filenames with special characters.
sed -e "s/^\"//" -e "s/\"$//g"
)
TARGETS=()
while IFS= read -r FILENAME
do
if [[ "$FILENAME" =~ .*\.exs? ]]; then
TARGETS+=("${FILENAME}")
fi
done <<< "$STAGED"
if (( ${#TARGETS[@]} )); then
mix format "${TARGETS[@]}"
git add "${TARGETS[@]}"
fi