post-checkout Git hook

post-checkout.sh

#!/usr/bin/env sh
. "$(dirname -- "$0")/_/husky.sh"

# ---------------------------
# POST-CHECKOUT PARAMS 
# ---------------------------
# Takes 3 params:
#  1: prev HEAD
#  2: new HEAD
#  3: branch change indicator (checkout file = 0; changing branches = 1)
# For more info check here: https://git-scm.com/docs/githooks/2.2.3
# ---------------------------
old_head=$1
new_head=$2
branch_changed=$3

# --- opt out if not a branch change
if [ $branch_changed != "1" ]; then
  exit 0;
fi

# --- get branch name and set ignore filename
new_branch=`git branch --show-current`
gitignore=.husky/gitignores/.gitignore
ignore_file=.husky/gitignores/.gitignore_$new_branch

# --- copy global .gitignore to project root
cp -f $gitignore ./

# --- only update .gitignore if there is a .gitignore.<branch_name> available
if [ -f "$ignore_file" ]; then
  echo $'\n\n'"# Branch ::: $new_branch" >> .gitignore
  echo "# -------------------------------" >> .gitignore
  cat $ignore_file >> .gitignore
fi