#!/usr/bin/env bash
# List git files as an indented tree (because the other tools suck).

set -e

usage() {
    cat <<EOF
gtree [-d] [REGEX] - list some or all git-tracked files as an indented tree.
Directories are shown with a trailing slash.
REGEX is a case-insensitive grep regexp matching the relative file paths.
-d: show only directories

Examples:
gtree
gtree -d
gtree yaml
gtree '(^|/)((bsd)?m|sh)ake'
EOF
    exit
}

ARGS=()
while [[ $# -gt 0 ]]; do
    key="$1"
    case $key in
        -h|--help)
            HELP=1
            shift
            ;;
        -d)
            D=1
            shift
            ;;
        *)
            if [[ "$1" != -* ]]
            then
                ARGS+=("$1")
                shift
            else
                >&2 echo "Error: unknown option $1"
                exit 1
            fi
            ;;
    esac
done
#if [[ $HELP = 1 || ${#ARGS} -eq 0 ]]; then usage; exit; fi
if [[ $HELP = 1 ]]; then usage; exit; fi

REGEX="${ARGS[0]:-.}"
ROOT=$(pwd)

# list git-tracked files
# keep only the paths matching REGEX, if provided
# convert paths list to an indented tree
# keep only the directories, if -d provided
git ls-files \
    | grep -iE "$REGEX" \
    | sed -e 's%/%/:%g' -e "s%^%account $ROOT/:%" | hledger -f- accounts -t \
    | grep -E "$(if [[ $D = 1 ]]; then echo '/$'; else echo '.'; fi)"