#!/bin/sh
# Wrapper around 'ack' to crawl all directories from `pwd` to / (or $HOME)
# looking for a "local" .ackrc file. Useful for setting project-level
# --ignore-dir settings.

# Search for "local" .ackrc file in CWD or any parents
HOME=~
ackrc=""
match=""
dir=$(pwd)
while [ "${dir}" != "/" -a "${match}" = "" ]; do
    if [ -e "${dir}/.ackrc" ]; then
        if [ "${dir}" != "${HOME}" ]; then
            match=1
            echo "(Include: ${dir}/.ackrc)"
            ackrc=$(egrep "^[^#]" "${dir}/.ackrc" | tr '\n' ' ')
        else
            match=0
        fi
    else
        dir=$(dirname "${dir}")
    fi
done

# Add quote-wrapping for any additional args to ensure proper passing to
# real 'ack'.
for arg in "$@"; do
    if [ -z "${ackrc}" ]; then
        ackrc="'${arg}'"
    else
        ackrc="${ackrc} '${arg}'"
    fi
done

# Build command to eval
cmd="command ack ${ackrc}"
if [ ! -t 0 ]; then
    # If stdin is a pipe, use cat to redirect stdin to stdout and pipe
    # that data into ack.
    cmd="cat | ${cmd}"
fi

# Eval the final command
eval "${cmd}"