#!/usr/bin/env bash

VERSION=1.3



# Get bash script directory's parent
INSTALLDIR="$(dirname $( cd -P "$( dirname "${BASH_SOURCE[0]}" )" && pwd ))"

# Directory for installed media files
SYSTEMSHARE="$INSTALLDIR/share/ponysay"
HOMESHARE="${HOME}/.local/share/ponysay"

# Subscripts
listcmd="$INSTALLDIR/lib/ponysay/list.pl"
linklistcmd="$INSTALLDIR/lib/ponysay/linklist.pl"
truncatercmd="$INSTALLDIR/lib/ponysay/truncater"
qlistcmd="$INSTALLDIR/lib/ponysay/pq4ps-list"
quotecmd="$INSTALLDIR/lib/ponysay/pq4ps"

pony="*"  # Selected pony
wrap=""   # Message wrap column
ponies=() # Selected ponies

scrw=`(stty size <&2 || echo 0 0) | cut -d ' ' -f 2` # Screen width
scrh=`(stty size <&2 || echo 0 0) | cut -d ' ' -f 1` # Screen height

# KMS ponies extension
kmscmd=""
[[ "$TERM" = "linux" ]] && kmscmd=$(for c in $(echo $PATH":" | sed -e 's/:/\/ponysay2kmsponysay /g'); do if [[ -f $c ]]; then echo $c; break; fi done)
[[ ! "$kmscmd" = "" ]] && TERM="-linux-"

# Directories for installed ponies files
if [ "$TERM" = "linux" ]; then
	SYSTEMPONIES="$SYSTEMSHARE/ttyponies"
	HOMEPONIES="$HOMESHARE/ttyponies"
else
	SYSTEMPONIES="$SYSTEMSHARE/ponies"
	HOMEPONIES="$HOMESHARE/ponies"
fi

# Cowsay script
if [[ ${0} == *ponythink ]]; then
	if [[ "$PONYSAY_COWTHINK" = "" ]]; then
		cmd=cowthink
		customcmd=0
	else
		cmd="$PONYSAY_COWTHINK"
		customcmd=1
	fi
else
	if [[ "$PONYSAY_COWSAY" = "" ]]; then
		cmd=cowsay
		customcmd=0
	else
		cmd="$PONYSAY_COWSAY"
		customcmd=1
	fi
fi



# Ponysay version print function
version() {
	echo "ponysay v$VERSION"
}

# Pony list function
list() {
	if [[ -d $SYSTEMPONIES ]]; then
		echo -e "\\e[01mponyfiles located in $SYSTEMPONIES:\\e[21m"
		perl $listcmd $scrw $(ls --color=no $SYSTEMPONIES | sed -e 's/\.pony$//' | sort) | $qlistcmd
        fi
	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) | $qlistcmd
	fi
	if [[ ! -d $SYSTEMPONIES ]] && [[ ! -d $HOMEPONIES ]]; then
		echo >&2 "All the ponies are missing! Call the Princess!"
	fi
}

# Pony list function with symlink map, for one directory
_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
	
	perl $listcmd $scrw $(perl $linklistcmd $(echo $args) | sed -e 's/ /_/g') | sed -e 's/_/ /g' | $qlistcmd
}

# Pony list function with symlink map, for both directories
linklist() {
	_linklist $SYSTEMPONIES
	
	if [[ -d $HOMEPONIES ]]; then
		_linklist $HOMEPONIES
	fi
}

# Pony quotes
ponyquotes() {
	[[ "$TERM" = "-linux-" ]] && TERM="linux"
	"$0" ${wrap:+-W$wrap} $("$quotecmd" "$*")
}

# Usage help print function
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.
  -q          Use the pony quote feature.
  -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
}

# Function for printing the ponies and the message
say() {
	# Ponies use UTF-8 drawing characters. Prevent a Perl warning.
	export PERL_UNICODE=S

	# Clear screen in TTY
	( [[ "$TERM" = "linux" ]] || [[ "$TERM" = "-linux-" ]]) && echo -ne '\e[H\e[2J'

	# Set PONYSAY_SHELL_LINES to default if not specified
	[[ "$PONYSAY_SHELL_LINES" = "" ]] && PONYSAY_SHELL_LINES=2

	# Width trunction
	function wtrunc {
		if [ "$PONYSAY_FULL_WIDTH" = 'yes' ] || [ "$PONYSAY_FULL_WIDTH" = 'y' ] || [ "$PONYSAY_FULL_WIDTH" = '1' ]; then
			cat
		else
			if [[ -f $truncatercmd ]]; then
				$truncatercmd $scrw
			else
				cat
			fi
		fi
	}

	# Height trunction, show top
	function htrunchead {
		head --lines=$(( $scrh - $PONYSAY_SHELL_LINES ))
	}

	# Height trunction, show bottom
	function htrunctail {
		tail --lines=$(( $scrh - $PONYSAY_SHELL_LINES ))
	}

	# Simplification of customisation of cowsay
	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) $ccmd > "/tmp/ponythink"
				perl '/tmp/ponythink' "$@"
				rm '/tmp/ponythink'
			else
				perl <(cat <(echo -e $pcmd) $ccmd) "$@"
			fi
		}
	else
		function cowcmd	{
			$cmd "$@"
		}
	fi

	# KMS ponies support
	if [[ "$kmscmd" = "" ]]; then
		function runcmd {
			cowcmd -f "$pony" "$@"
		}
	else
		function runcmd {
			cowcmd -f <($kmscmd "$pony") "$@"
		}
	fi

	# Print the pony and the message
	if [ "$TERM" = "linux" ] || [ "$PONYSAY_TRUNCATE_HEIGHT" = 'yes' ] || [ "$PONYSAY_TRUNCATE_HEIGHT" = 'y' ] || [ "$PONYSAY_TRUNCATE_HEIGHT" = '1' ]; then
		if [ "$PONYSAY_BOTTOM" = 'yes' ] || [ "$PONYSAY_BOTTOM" = 'y' ] || [ "$PONYSAY_BOTTOM" = '1' ]; then
		        runcmd "${wrap:+-W$wrap}" | wtrunc | htrunctail
		else
		        runcmd "${wrap:+-W$wrap}" | wtrunc | htrunchead
		fi
	else
		runcmd "${wrap:+-W$wrap}" | wtrunc
	fi
}



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



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


# Check for cowsay
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


# Select random pony for the set of -f arguments
if [[ ! ${#ponies[@]} == 0 ]]; then
	pony="${ponies[$RANDOM%${#ponies[@]}]}"
fi


# Pony not a file? Search for it
if [[ ! -f $pony ]]; then
	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


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