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	add a separate script to generate a gif or tty animation from FEN + moves - che…
	git clone git://git.codemadness.org/chess-puzzles
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	---
	commit 3ee1d913ba6bcafbf4647c86d45aaf958954793e
	parent 5bf484cc8a074778fe73a54541288119dd207822
	Author: Hiltjo Posthuma <[email protected]>
	Date: Mon, 22 Jan 2024 19:28:32 +0100

	add a separate script to generate a gif or tty animation from FEN + moves

	Diffstat:
	R gifs.sh -> gifs_for_puzzles.sh \| 0
	A moves.sh \| 75 +++++++++++++++++++++++++++++…

	2 files changed, 75 insertions(+), 0 deletions(-)
	---
	diff --git a/gifs.sh b/gifs_for_puzzles.sh
	diff --git a/moves.sh b/moves.sh
	@@ -0,0 +1,75 @@
	+#!/bin/sh
	+# make a list of moves from start to end for each move.
	+
	+output_tty() {
	+ while read -r moves; do
	+ clear
	+ ./fen -o tty "$fen" "$moves"
	+ echo ""
	+ ./fen -o pgn "$fen" "$moves"
	+ echo ""
	+ ./fen -o speak -l "$fen" "$moves"
	+ sleep 2
	+ done
	+}
	+
	+# create animated gifs for puzzle solutions.
	+# Dependencies: ffmpeg, ImageMagick, etc.
	+output_gif() {
	+ tmppal="$(mktemp '/tmp/palette_XXXXXXXX.png')"
	+ tmpdir="$(mktemp -d '/tmp/fen_gif_XXXXXXXX')"
	+
	+ n=1
	+ while read -r moves; do
	+ f="$tmpdir/$n.svg"
	+ ./fen -o svg "$fen" "$moves" > "$f"
	+ test -s "$f" \|\| break
	+
	+ # initial puzzle state also
	+ dest="$tmpdir/$n.png"
	+ convert "$f" "$dest"
	+
	+ n=$((n + 1))
	+ done
	+
	+ # create video / animation.
	+
	+ # generate palette for gif.
	+ rm -f "$tmppal"
	+ ffmpeg -loglevel error -stats -i "$tmpdir/%d.png"\
	+ -vf palettegen "$tmppal"
	+
	+ # wait longer for last frame.
	+ ffmpeg -loglevel error -stats -framerate 1\
	+ -i "$tmpdir/%d.png" \
	+ -i "$tmppal" \
	+ -lavfi 'tpad=stop_mode=clone:stop_duration=4[v];[v]paletteuse[…
	+ -map '[out]' \
	+ -f gif \
	+ -
	+
	+ rm -rf "$tmpdir"
	+ rm -f "$tmppal"
	+}
	+
	+if [ "$1" = "" ] \|\| [ "$2" = "" ]; then
	+ echo "$0 <fen> <moves>" >&2
	+ exit 1
	+fi
	+
	+fen="$1"
	+m="$2"
	+while [ "$m" != "" ]; do
	+ prevmoves="$m"
	+ echo "$m"
	+
	+ m="${m% }"
	+ m="${m%[a-h][0-9][a-h][0-9]}"
	+ m="${m%[qrbnQRBN]}" # possible promotion
	+ m="${m% }"
	+
	+ test "$prevmoves" = "$m" && break # same, break also
	+done \| \
	+sort \| \
	+output_gif
	+#output_tty