Run a git command when entering a directory

Over on Mastodon, Eric Meyer asked:

A bash script I want: whenever I cd into a repository directory from a directory outside that repository, git branch is fed to stdout, so I can see all the local branches. Does anything like this exist?

This is easily done by replacing the built-in cd command with a custom shell function. Simply add the following code to your .bashrc or .zshrc:

cd () {
  local _arg="$1"

  builtin cd "$_arg" || exit 1
  if [ -d .git ]; then
    echo "Branches in $(pwd):"
    git branch

Hope that helps, Eric!

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