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	moves.sh - chess-puzzles - chess puzzle book generator
	git clone git://git.codemadness.org/chess-puzzles
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	---
	moves.sh (1409B)
	---
	1 #!/bin/sh
	2 # make a list of moves from start to end for each move.
	3
	4 # output moves to tty with some delay.
	5 # Show PGN and human speech-like text for the moves.
	6 output_tty() {
	7 while read -r moves; do
	8 clear
	9 ./fen -o tty "$fen" "$moves"
	10 echo ""
	11 ./fen -o pgn "$fen" "$moves"
	12 echo ""
	13 ./fen -o speak -l "$fen" "$moves"
	14 sleep 2
	15 done
	16 }
	17
	18 # create an animated gif.
	19 # Dependencies: ffmpeg, ImageMagick, etc.
	20 output_gif() {
	21 tmppal="$(mktemp '/tmp/palette_XXXXXXXX.png')"
	22 tmpdir="$(mktemp -d '/tmp/fen_gif_XXXXXXXX')"
	23
	24 n=1
	25 while read -r moves; do
	26 f="$tmpdir/$n.svg"
	27 ./fen -o svg "$fen" "$moves" > "$f"
	28 test -s "$f" \|\| break
	29
	30 dest="$tmpdir/$n.png"
	31 convert "$f" "$dest"
	32
	33 n=$((n + 1))
	34 done
	35
	36 # generate palette for gif.
	37 rm -f "$tmppal"
	38 ffmpeg -loglevel error -stats -i "$tmpdir/%d.png"\
	39 -vf palettegen "$tmppal"
	40
	41 # create video / animation.
	42 # wait longer for last frame.
	43 ffmpeg -loglevel error -stats -framerate 1\
	44 -i "$tmpdir/%d.png" \
	45 -i "$tmppal" \
	46 -lavfi 'tpad=stop_mode=clone:stop_duration=4[v];[v]palet…
	47 -map '[out]' \
	48 -f gif \
	49 -
	50
	51 rm -rf "$tmpdir"
	52 rm -f "$tmppal"
	53 }
	54
	55 if [ "$1" = "" ] \|\| [ "$2" = "" ]; then
	56 echo "$0 <fen> <moves>" >&2
	57 exit 1
	58 fi
	59
	60 fen="$1"
	61 m="$2"
	62 while [ "$m" != "" ]; do
	63 prevmoves="$m"
	64 echo "$m"
	65
	66 m="${m% }"
	67 m="${m%[^ ]*}"
	68 m="${m% }"
	69
	70 test "$prevmoves" = "$m" && break # same, break also
	71 done \| \
	72 sort \| \
	73 output_gif
	74
	75 #output_tty