From c9103840d936398902bff672df5dbfb542cced5b Mon Sep 17 00:00:00 2001
From: Ole Morud <olekr99@hotmail.com>
Date: Fri, 10 Jun 2022 14:15:49 +0200
Subject: [PATCH] Add board display feature

---
 chess.c | 66 +++++++++++++++++++++++++++++++++++++++++++++------------
 1 file changed, 52 insertions(+), 14 deletions(-)

diff --git a/chess.c b/chess.c
index 88d19e1..c00dc0f 100644
--- a/chess.c
+++ b/chess.c
@@ -1,4 +1,6 @@
 
+#include <locale.h>
+#include <string.h>
 #include <wchar.h>
 #include <stdio.h>
 #include <stdlib.h>
@@ -14,37 +16,62 @@
 #define WHITE 1
 #define BLACK -1
 
-int main(){
-	int *board;
-	init_board(board);
-	print_board(board);
-
-	return 0;
-}
-
-
 
 void print_board(int* board){
 	wchar_t piece;
-	
+
 	// The unicode value for a white chess king is 0x2654
 	// the following unicode 5 unicode characters are the 
 	// other white chess pieces. (matches macro definitions)
 	// (https://en.wikipedia.org/wiki/Chess_symbols_in_Unicode)
+
 	for(int i=0; i<8; i++){
-		for(int j=0; j<8; j++){
-			piece = 0x2654 + board[i];
-			putwchar(piece);
+		printf(" %i ", 8-i); // number coordinates
+
+		for(int j=0; j<8; j++){	
+			int p = board[i*8+j];
+			
+			// set tile color
+			if((i+j) % 2)
+				printf("\033[100;39m"); // "light black"
+			else
+				printf("\033[107;39m"); // "light white"
+
+			if(p == E){
+				putchar(' ');
+			}else{
+				if(p > 0){
+					printf("\033[37m"); // white foreground
+				}else{
+					printf("\033[30m"); // black foreground
+					p *= -1;
+				}
+
+				piece = 0x2659 + p; // unicode for black king is 0x267a (0x2659 + 1).
+									// The macro definitions of pieces align with 
+									// unicode values to display the correct piece.
+				printf("%lc", piece);
+			}
+
+			putchar(' ');
 		}
+
+		printf("\033[0m"); // reset text attributes
 		putchar('\n');
 	}
+
+	printf("\033[0m"); // reset text attributes
+	
+	// print letter coordinates
+	printf("  ");
+	for(int i=0; i<8; i++) printf(" %c", 'A'+i);
 }
 
 
 
 void init_board(int *board){
 	
-	// black pieces are prefixed by minus (-)
+	// black pieces are prefixed by a minus (-)
 	const int start[] = {
 		-R,-N,-B,-Q,-K,-B,-N,-R, 
 		-P,-P,-P,-P,-P,-P,-P,-P, 
@@ -58,3 +85,14 @@ void init_board(int *board){
 
 	memcpy(board, start, sizeof(start));
 }
+
+
+int main(){
+	setlocale(LC_ALL, "C.UTF-8");
+
+	int *board;
+	init_board(board);
+	print_board(board);
+
+	return 0;
+}