#!/bin/bash
# Verify status and help message when running without arguments.

if [[ $# != 1 ]]; then
   echo "$0 <split_png.exe>"
   exit 1
fi

SPLITTER=$1
MSG=$(mktemp -p .)

function die
{
   echo "$1"
   rm -f "$MSG"
   exit 1
}

# Test zero arguments.
if ( "./$SPLITTER" > "$MSG" ); then
   die "$LINENO: Unexpected success."
fi
if ! ( grep -qi "in.*png.*out.*png.*out.*png" "$MSG" ); then
   die "$LINENO: Missing help message."
fi

# Test one argument.
if ( "./$SPLITTER" unused1 > "$MSG" ); then
   die "$LINENO: Unexpected success."
fi
if ! ( grep -qi "in.*png.*out.*png.*out.*png" "$MSG" ); then
   die "$LINENO: Missing help message."
fi

# Test two arguments.
if ( "./$SPLITTER" unused1 unused2 > "$MSG" ); then
   die "$LINENO: Unexpected success."
fi
if ! ( grep -qi "in.*png.*out.*png.*out.*png" "$MSG" ); then
   die "$LINENO: Missing help message."
fi

rm -f "$MSG"
exit 0