#!/usr/bin/env bash
#
# try.sh - demonstrate IOCCC submission 2025/marcille

# Make sure CC is set so that when we do make CC="$CC" it isn't empty.
# Doing it this way allows us to have the user specify a different compiler
# in an easy way.
[[ -z "$CC" ]] && CC="cc"

# Build the program.
make CC="$CC" all >/dev/null || exit 1

# Try to detect terminal size and Sixel support using control sequences.
stty -echo

# Send "report size of text area" command.  Reply might look like
# "\e[8;25;80t", which says height is 25 and width is 80.
#
# The default is 80x25 if we can't detect the terminal size automatically.
# Most terminals supports this control sequence for getting terminal size
# so autodetect usually works, one notable exception is GNU screen.
IFS=";?c" read -a REPLY -s -t 1 -d "t" -p $'\e[18t' >&2
width=80
height=25
if [[ "${REPLY[1]}" -gt "10" ]] && [[ "${REPLY[2]}" -gt "10" ]]; then
   width=${REPLY[2]}
   height=${REPLY[1]}
fi

# Reduce height by one line so that user can see the second prompt.
height=$(($height-1))

# Send "send device attributes" command.  Reply might look like "\e[4;6c",
# which indicates that it's a "VT132 with Advanced Video and Graphics",
# which means Sixel is available.
IFS=";?c" read -a REPLY -s -t 1 -d "c" -p $'\e[c' >&2
has_sixel=0
for code in "${REPLY[@]}"; do
   if [[ "$code" == "4" ]]; then
      has_sixel=1
      break
   fi
done
stty echo

# Clear screen after compilation so that only the submission is shown.
clear

# First demo will be the dungeon output.
read -r -n 1 -p "Press any key to run: ./prog $width $height | sed -e 's/\\S/#/g' "
./prog "$width" "$height" | sed -e 's/\S/#/g'

# Second demo is Sixel output if terminal supports Sixels, or a command to
# convert output to PNG otherwise.
if [[ "$has_sixel" == "1" ]]; then
   read -r -n 1 -p "Press any key to run: ./prog $width $height "
   ./prog "$width" "$height"

else
   read -r -n 1 -p "Press any key to run: ./prog $width $height | convert sixel:- walking_mushroom.png "
   ./prog "$width" "$height" | convert sixel:- walking_mushroom.png
fi