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	small code-cleanup and add some comments - chess-puzzles - chess puzzle book ge…
	git clone git://git.codemadness.org/chess-puzzles
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	---
	commit df3a95f12df8a701ed0ad5997be6ad5c3f840bda
	parent da65c61271ad6e8eb3fde5a8e828ed4d2c882fb2
	Author: Hiltjo Posthuma <[email protected]>
	Date: Mon, 8 Jan 2024 21:50:26 +0100

	small code-cleanup and add some comments

	Diffstat:
	M fen.c \| 53 +++++++++++++++++------------…

	1 file changed, 30 insertions(+), 23 deletions(-)
	---
	diff --git a/fen.c b/fen.c
	@@ -15,19 +15,20 @@
	#define SETFGCOLOR(r,g,b) printf("\x1b[38;2;%d;%d;%dm", r, g, b)
	#define SETBGCOLOR(r,g,b) printf("\x1b[48;2;%d;%d;%dm", r, g, b)

	-enum outputmode { ModeInvalid = 0, ModeASCII, ModeCGI, ModeFEN, ModePGN, ModeT…
	-enum outputmode outputmode = ModeSVG;
	+enum outputmode { ModeInvalid = 0, ModeASCII, ModeCGI, ModeFEN, ModePGN,
	+ ModeTTY, ModeSVG, ModeSpeak };
	+enum outputmode outputmode = ModeSVG; /* default is SVG */

	static int onlylastmove = 0, silent = 0, dutchmode = 0;

	/* localization of letter for PGN pieces */
	const char *pgn_piecemapping = "";

	-typedef unsigned char Color;
	+typedef unsigned char Color; /* for RGB: 0-255 */

	struct theme {
	const char *name;
	- /* RGB */
	+ /* RGB values */
	Color border[3];
	Color darksquare[3];
	Color lightsquare[3];
	@@ -60,7 +61,7 @@ struct theme themes[] = {
	.lightsquarecheck = { 0xff, 0x6a, 0x6a },
	.darksquarecheck = { 0xff, 0x3a, 0x3a }
	},
	-/* greyscale theme, highlight is still green */
	+/* greyscale theme, highlight is still green though */
	{
	.name = "grey",
	.border = { 0x00, 0x00, 0x00 },
	@@ -88,9 +89,7 @@ struct board {

	int flipboard; /* flip board ? default: 0 */
	int showcoords; /* board coordinates? default: 1 */
	-
	- /* board theme */
	- struct theme *theme;
	+ struct theme theme; / board theme */
	};

	/* set theme by name */
	@@ -108,11 +107,12 @@ board_set_theme(struct board b, const char name)
	return NULL;
	}

	+/* initialize board and set sane defaults */
	void
	board_init(struct board *b)
	{
	memset(b, 0, sizeof(b)); / zero fields by default */
	- b->side_to_move = 'w';
	+ b->side_to_move = 'w'; /* white */
	b->enpassantsquare[0] = -1; /* no en passant */
	b->enpassantsquare[1] = -1;
	b->movenumber = 1;
	@@ -121,6 +121,7 @@ board_init(struct board *b)
	b->theme = &themes[0]; /* use first theme as default */
	}

	+/* copy entire board and its state */
	void
	board_copy(struct board bd, struct board bs)
	{
	@@ -191,6 +192,7 @@ squaretoxy(const char s, int x, int *y)
	return 0;
	}

	+/* write formatted string, only if output mode is ModePGN */
	void
	pgn(const char *fmt, ...)
	{
	@@ -204,6 +206,20 @@ pgn(const char *fmt, ...)
	va_end(ap);
	}

	+/* write formatted string, only if output mode is ModeSpeak */
	+void
	+speak(const char *fmt, ...)
	+{
	+ va_list ap;
	+
	+ if (outputmode != ModeSpeak \|\| silent)
	+ return;
	+
	+ va_start(ap, fmt);
	+ vprintf(fmt, ap);
	+ va_end(ap);
	+}
	+
	/* remap letter for PGN pieces, default: "KQRBN"
	Dutch: (K)oning, (D)ame, (T)oren, (L)oper, (P)aard: "KDTLP" */
	int
	@@ -227,19 +243,6 @@ pgnpiece(int piece)
	}

	void
	-speak(const char *fmt, ...)
	-{
	- va_list ap;
	-
	- if (outputmode != ModeSpeak \|\| silent)
	- return;
	-
	- va_start(ap, fmt);
	- vprintf(fmt, ap);
	- va_end(ap);
	-}
	-
	-void
	speakpiece(int piece)
	{
	switch (piece) {
	@@ -764,6 +767,8 @@ isincheck(struct board *b, int side)
	return 0;
	}

	+/* copy the board state and try the piece move, see if the piece wouldn't put
	+ the ourself in check */
	int
	trypiecemove(struct board *b, int side, int piece,
	int x1, int y1, int x2, int y2, int px, int py)
	@@ -1406,7 +1411,9 @@ board_playmoves(struct board b, const char moves)
	void
	usage(char *argv0)
	{
	- fprintf(stderr, "usage: %s [-cCfF] [-l] [-m mapping] [-o ascii\|fen\|pgn…
	+ fprintf(stderr, "usage: %s [-cCfF] [-l] [-m mapping] "
	+ "[-o ascii\|fen\|pgn\|speak\|svg\|tty] [-t default\|green\|grey] "
	+ "[FEN] [moves]\n", argv0);
	exit(1);
	}