build: add basic flake.nix

.gitignore

@@ -5,4 +5,5 @@ engine_manager
 .vscode
 *~
 src/resources.c
-temp
+temp
+result

Makefile

@@ -3,7 +3,7 @@ STD		?= c17
 GTK		= gtk+-3.0
 RSVG	= librsvg-2.0
 GIO		= gio-unix-2.0 gio-2.0
-PKGCONF	= $(shell which pkg-config)
+PKGCONF	?= $(shell which pkg-config)
 CFLAGS	+= -Wall -std=$(STD) -O3 `$(PKGCONF) --cflags $(GTK) $(RSVG) $(GIO)`
 LDFLAGS	+= `$(PKGCONF) --libs $(GTK) $(RSVG) $(GIO)` -lm
 
@@ -33,7 +33,10 @@ UI = src/window.glade
 
 all: prepare engine_manager $(OBJECTS)
 	$(CC) $(CFLAGS) -rdynamic -o GTKChess $(OBJECTS) $(LDFLAGS)
-	gio set -t string GTKChess metadata::custom-icon file://$(PWD)/src/textures/classic/WKnight.svg
+	# FIXME: `nix build` fails with error: 
+	# 	gio: Setting attribute metadata::custom-icon not supported
+	#
+	# gio set -t string GTKChess metadata::custom-icon file://$(PWD)/src/textures/classic/WKnight.svg
 
 engine_manager: $(OBJDIR)/engine_manager.o
 	$(CC) $(CFLAGS) -o engine_manager $< $(LDFLAGS) -pthread
@@ -69,4 +72,4 @@ check_sources:
 clean_check:
 	rm -f $(TEMPDIR)/*
 
-restore: cleaner clean_check
+restore: cleaner clean_check

flake.nix

@@ -0,0 +1,30 @@
+{
+  description = "A nix flake for GTK-Chess, UCI chess engine GUI written in C.";
+  nixConfig = {
+    extra-experimental-features = [ "nix-command" "flakes" ];
+    extra-substituters = [ "https://cache.zw3rk.com" ];
+    extra-trusted-public-keys = [ "loony-tools:pr9m4BkM/5/eSTZlkQyRt57Jz7OMBxNSUiMC4FkcNfk=" ];
+
+    bash-prompt = "\\[\\e[0m\\][\\[\\e[0;2m\\]nix-develop \\[\\e[0;1m\\]gtk-chess@\\[\\033[33m\\]$(git rev-parse --abbrev-ref HEAD) \\[\\e[0;32m\\]\\w\\[\\e[0m\\]]\\[\\e[0m\\]$ \\[\\e[0m\\]";  
+  };
+
+  inputs = {
+    nixpkgs.url = "github:nixos/nixpkgs?ref=22.11"; 
+  };
+
+  outputs = { self, nixpkgs }: {
+    defaultPackage.x86_64-linux = self.packages.gtkChess;
+
+    packages.gtkChess = 
+      with import nixpkgs { system = "x86_64-linux"; }; 
+      stdenv.mkDerivation {
+        name = "GTK-Chess";
+        version = "dev";
+        src = ./.;
+        nativeBuildInputs = [ clang gnumake pkg-config which libxml2 ];
+        buildInputs = [ gtk3 librsvg glib ];
+        buildPhase = "make all";
+        installPhase = "mkdir -p $out/bin; cp GTKChess $out/bin";
+      };
+  };
+}