#!/bin/bash

function test {
    MESSAGE=$1
    RECEIVED=$2
    EXPECTED=$3

    if [ $RECEIVED = $EXPECTED ]; then
        echo -e "\033[32m✔︎ Tested $MESSAGE"
    else
        echo -e "\033[31m✘ Tested $MESSAGE"
        echo -e "  Received: $RECEIVED"
        echo -e "  Expected: $EXPECTED"
    fi
    echo -en "\033[0m"
}

function testSuite {
    test 'absolute call' `bash /tmp/1234/test.sh` /tmp/1234
    test 'via symlinked dir' `bash /tmp/current/test.sh` /tmp/1234
    test 'via symlinked file' `bash /tmp/test.sh` /tmp/1234
    pushd /tmp >/dev/null
    test 'relative call' `bash 1234/test.sh` /tmp/1234
    popd >/dev/null
}

function setup {
    DIR=/tmp/1234
    FILE=test.sh
    if [ -e $DIR ]; then rm -rf $DIR; fi; mkdir $DIR
    if [ -f $DIR/$FILE ]; then rm -rf $DIR/$FILE; fi; touch $DIR/$FILE
    if [ -f /tmp/$FILE ]; then rm /tmp/$FILE; fi; ln -s $DIR/$FILE /tmp
    if [ -f /tmp/current ]; then rm /tmp/current; fi; ln -s $DIR /tmp/current
}

function test1 {
    echo 'Test 1: via dirname'
    cat <<- EOF >/tmp/1234/test.sh
	echo \`dirname \$0\`
	EOF
    testSuite
}

function test2 {
echo 'Test 2: via pwd'
    cat <<- EOF >/tmp/1234/test.sh
	CACHE_DIR=\$( cd "\$( dirname "\${BASH_SOURCE[0]}" )" && pwd )
	echo \$CACHE_DIR
	EOF
    testSuite
}

function test3 {
    echo 'Test 3: via readlink'
    cat <<- EOF >/tmp/1234/test.sh
	echo \`dirname \$(readlink -f \$0)\`
	EOF
    testSuite
}

setup
test1
test2
test3