gtree (tree w/ quick-and-dirty .gitignore support)

gtree.sh

#!/bin/bash
set -e
args=() gitdir=. excl='.git|*~'

oldpwd="$PWD"
while [ "$PWD" != / -a "$PWD" != // ]; do
  if [ -e .git ]; then
    gitdir="$PWD"; break
  fi
  cd ..
done
cd "$oldpwd"

while read -r; do
  excl="$( grep -Ev '^#|^$' "$REPLY" \
             | sed 's!^/!!; s!$!|!' | tr -d '\n' )$excl"
done < <( find "$gitdir" -name .gitignore )

while [ $# -gt 0 ]; do
  if [ "$1" = -I ]; then
    shift; excl+="|$1"
  else
    args+=( "$1" )
  fi
  shift
done

exec tree -I "$excl" "${args[@]}"