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#!/usr/bin/env bash

version=1.0
SYSTEMPONIES="/usr/share/ponysay/ponies"
HOMEPONIES="${HOME}/.local/share/ponysay/ponies"
SCRIPTDIR="$( cd -P "$( dirname "${BASH_SOURCE[0]}" )" && pwd )" # Get bash script directory
pony="*"
wrap=""

if [ "$TERM" = "linux" ]; then
	SYSTEMPONIES="/usr/share/ponysay/ttyponies"
	HOMEPONIES="${HOME}/.local/share/ponysay/ttyponies"
fi

if [[ "$PONYSAY_COWSAY" = "" ]]; then
	cmd=cowsay
	customcmd=0
else
	cmd="$PONYSAY_COWSAY"
	customcmd=1
fi

[[ ${0} == *ponythink ]] &&
if [[ "$PONYSAY_COWTHINK" = "" ]]; then
	cmd=cowthink
	customcmd=0
else
	cmd="$PONYSAY_COWTHINK"
	customcmd=1
fi

version() {
	echo "ponysay v$version"
}

scrw=`(stty size <&2 || echo 0 0) | cut -d ' ' -f 2`
listcmd="${SCRIPTDIR}/../lib/ponysay/list.pl"
truncatercmd="${SCRIPTDIR}/../lib/ponysay/truncater"

haspq=1
if [[ -f './pq4ps-list' ]]; then
	function qlist {
		./pq4ps-list
	}
elif [[ -f '/usr/bin/pq4ps-list' ]]; then
	function qlist {
		/usr/bin/pq4ps-list
	}
else
	haspq=0
	function qlist {
		cat
	}
fi

list() {
	echo -e "\\e[01mponyfiles located in $SYSTEMPONIES:\\e[21m"
	perl $listcmd $scrw $(ls --color=no $SYSTEMPONIES | sed -e 's/\.pony$//' | sort) | qlist
	
	if [[ -d $HOMEPONIES ]]; then
		echo -e "\\e[01mponyfiles located in $HOMEPONIES:\\e[21m"
		perl $listcmd $scrw $(ls --color=no $HOMEPONIES | sed -e 's/\.pony$//' | sort) | qlist
	fi
}

_linklist() {
	echo -e "\\e[01mponyfiles located in $1:\\e[21m"
	files=$(ls --color=no $1 | sed -e 's/\.pony$//' | sort)
	
	args=""
	
	for file in $files; do
		target=$(readlink $1"/"$file".pony")
		
		if [[ $target = "" ]]; then
			target=$file
		else
			target=$(echo $target | sed -e 's/^\.\///g' -e 's/\.pony$//g')
		fi
		
		args=$(echo $args $file $target)
	done
	
	scrw=`(stty size <&2 || echo 0 0) | cut -d ' ' -f 2`
	
	perl '/dev/stdin' $(echo $args) <<EOF | sed -e 's/ /_/g' > '/dev/shm/.ponysay~'
#!/usr/bin/perl

#Author: Mattias Andrée (maandree@kth.se)

%hash = ();
\$argc = @ARGV;

\$i = 0;
while (\$i < \$argc)
{
    \$source = \$ARGV[\$i];
    \$i += 1;
    \$target = \$ARGV[\$i];
    \$i += 1;
    if (\$source eq \$target)
    {
        \$hash{\$source} = [ () ];
    }
}

\$i = 0;
while (\$i < \$argc)
{
    \$source = \$ARGV[\$i];
    \$i += 1;
    \$target = \$ARGV[\$i];
    \$i += 1;
    unless (\$source eq \$target)
    {
        push @{ \$hash{\$target} }, \$source;
    }
}

\$i = 0;
while (\$i < \$argc)
{
    \$source = \$ARGV[\$i];
    \$i += 1;
    \$target = \$ARGV[\$i];
    \$i += 1;
    if (\$source eq \$target)
    {
        @list = @{ \$hash{\$source} };
        \$first = 1;
        print \$source;
        foreach \$link (@list)
        {
            if (\$first eq 1)
            {
                print " (".\$link;
                \$first = 0;
            }
            else
            {
                print " ".\$link;
            }
        }
        if (\$first eq 0)
        {
            print ")";
        }
        print "\n";
    }
}
EOF
	
	perl $listcmd $scrw $(cat "/dev/shm/.ponysay~") | sed -e 's/_/ /g' | qlist
	rm '/dev/shm/.ponysay~'
}

linklist() {
	_linklist $SYSTEMPONIES
	
	if [[ -d $HOMEPONIES ]]; then
		_linklist $HOMEPONIES
	fi
}

usage() {
	version
	cat <<EOF

Usage:
${0##*/} [options] [message]

If [message] is not provided, reads the message from STDIN.

Options:
  -v          Show version and exit.
  -h          Show this help and exit.
  -l          List pony files.
  -L          List pony files with synonyms inside brackets.
EOF
	
	if [[ $haspq = 1 ]]; then
		cat <<EOF
  -q          Use the pony quote feature.
EOF
	fi
	
	cat <<EOF
  -f[name]    Select a pony (either a file name or a pony name.)
  -W[column]  The screen column where the message should be wrapped.

See man ponysay(6) for more information.
EOF
}

# if no stdin and no arguments then print usage and exit
if [[ -t 0 && $# == 0 ]]; then
	usage
	exit
fi

say() {
	# Ponies use UTF-8 drawing characters. Prevent a Perl warning.
	export PERL_UNICODE=S
	
	if [ "$TERM" = "linux" ]; then
		echo -ne '\e[H\e[2J'
	fi
	
	function wtrunc {
		if [ "$PONYSAY_FULL_WIDTH" = 'yes' ] || [ "$PONYSAY_FULL_WIDTH" = 'y' ] || [ "$PONYSAY_FULL_WIDTH" = '1' ]; then
			cat
		else
			WIDTH=`(stty size <&2 || echo 0 0) | cut -d ' ' -f 2`
			$truncatercmd $WIDTH 2>/dev/null || cat
		fi
	}
	
	if [ "$PONYSAY_SHELL_LINES" = "" ]; then
		PONYSAY_SHELL_LINES=2
	fi
	
	function htrunchead {
		head --lines=$(( `stty size <&2 | cut -d ' ' -f 1` - $PONYSAY_SHELL_LINES ))
	}
	
	function htrunctail {
		tail --lines=$(( `stty size <&2 | cut -d ' ' -f 1` - $PONYSAY_SHELL_LINES ))
	}
	
	if [[ $customcmd = 0 ]]; then
		function cowcmd {
			pcmd='#!/usr/bin/perl\nuse utf8;'
			ccmd=$(for c in $(echo $PATH":" | sed -e 's/:/\/'"$cmd"' /g'); do if [[ -f $c ]]; then echo $c; break; fi done)
			
			if [[ ${0} == *ponythink ]]; then
				cat <(echo -e $pcmd) $ccmd > "/dev/shm/.ponythink"
				perl '/dev/shm/.ponythink' "$@"
				rm '/dev/shm/.ponythink'
			else
				perl <(cat <(echo -e $pcmd) $ccmd) "$@"
			fi
		}
	else
		function cowcmd	{
			echo "custom $cmd"
			$cmd "$@"
		}
	fi
	
	if [ "$TERM" = "linux" ] || [ "$PONYSAY_TRUNCATE_HEIGHT" = 'yes' ] || [ "$PONYSAY_TRUNCATE_HEIGHT" = 'y' ] || [ "$PONYSAY_TRUNCATE_HEIGHT" = '1' ]; then
		if [ "$PONYSAY_BOTTOM" = 'yes' ] || [ "$PONYSAY_BOTTOM" = 'y' ] || [ "$PONYSAY_BOTTOM" = '1' ]; then
			cowcmd -f "$pony" "${wrap:+-W$wrap}" | wtrunc | htrunctail
		else
			cowcmd -f "$pony" "${wrap:+-W$wrap}" | wtrunc | htrunchead
		fi
	else
		cowcmd -f "$pony" "${wrap:+-W$wrap}" | wtrunc
	fi
}

ponies=()

opts="f:W:Llhv"
if [[ $haspq ]]; then
	opts=$opts"q"
fi

usepq=0
while getopts $opts OPT; do
	case ${OPT} in
		v)  version; exit ;;
		h)  usage; exit ;;
		f)  ponies+=( "$OPTARG" ) ;;
		l)  list; exit ;;
		L)  linklist; exit ;;
		W)  wrap="$OPTARG" ;;
		q)  usepq=1 ;;
		\?) usage >&2; exit 1 ;;
	esac
done
shift $((OPTIND - 1))

if [[ $usepq = 1 ]]; then
	if [[ -f './pq4ps' ]]; then
		function q {
			./pq4ps $@
		}
	elif [[ -f '/usr/bin/pq4ps' ]]; then
		function q {
			/usr/bin/pq4ps $@
		}
	fi
	$0 ${wrap:+-W$wrap} $(q "$*")
	exit
fi

hash $cmd &>/dev/null; if [ $? -ne 0 ]; then
	cat >&2 <<EOF
You don't seem to have the $cmd program.
Please install it in order to use this wrapper.

Alternatively, symlink it to '$cmd' in anywhere in \$PATH
if it actually exists under a different filename.
EOF
	exit 1
fi

if [[ ! ${#ponies[@]} == 0 ]]; then
	pony="${ponies[$RANDOM%${#ponies[@]}]}"
fi

if [[ ! -f $pony ]]; then
	# Pony not a file? Search for it
	
	ponies=()
	[[ -d $SYSTEMPONIES ]] && ponies+=( "$SYSTEMPONIES"/$pony.pony )
	[[ -d $HOMEPONIES ]]   && ponies+=( "$HOMEPONIES"/$pony.pony )
	
	if (( ${#ponies} < 1 )); then
		echo >&2 "All the ponies are missing! Call the Princess!"
		exit 1
	fi
	
	# Choose a random pony
	pony="${ponies[$RANDOM%${#ponies[@]}]}"
fi

if [[ -n "$*" ]]; then
	# Handle a message given via arguments
	say <<<"$*"
else
	say
fi