A git-hook that runs credo and optionally the formatter on commited changes

post-commit

#!/bin/sh
#
# Runs credo and the formatter on the staged files, after the commit is made
# This is purely for notification and will not halt/change your commit.

# You must add the "path to Elixir 1.6 repository" to `ELIXIR_16` environment variable,
# Add this to your shell's `.rc`:
# export ELIXIR_16=path/to/elixir1.6

# List all .ex files staged in the previous commit
# Also pick any .exs from tests, except mock files.

RED='\033[1;31m'
LGRAY='\033[1;30m'
NC='\033[0m' # No Color

# define your filter patterns for credo
LIB="lib/.*.ex$"
TEST="test/.*.exs$"
TEST_SUPPORT="test/support/.*.ex$"
MIGRATIONS="priv/repo/migrations/.*.exs$"

# Compose them into 1 filter
FILTER=$LIB"|"$TEST"|"$MIGRATIONS

# Compute the set of staged files that match your filter pattern.
staged=$(git diff-tree --no-commit-id -r --name-only HEAD |
             egrep $FILTER)

printf "${RED}Running 'mix credo --format=oneline' on staged files...${NC}\n"
echo
for blob in $staged; do
    echo $blob
    mix credo $blob --format=oneline
done
echo

Place this file here .git/hooks/post-commit