build: move map & rng logic to their own libraries

Signed-off-by: NotAShelf <raf@notashelf.dev>
Change-Id: I1802469f3baff4576f61accfb5a197d86a6a6964

build.zig

@@ -4,6 +4,56 @@ pub fn build(b: *std.Build) void {
     const target = b.standardTargetOptions(.{});
     const optimize = b.standardOptimizeOption(.{});
 
+    const c_flags = [_][]const u8{
+        "-std=c99",
+        "-Wall",
+        "-Wextra",
+        "-O2",
+    };
+
+    // RNG library
+    const rng_lib = b.addLibrary(.{
+        .name = "rng",
+        .root_module = b.createModule(.{
+            .target = target,
+            .optimize = optimize,
+            .link_libc = true,
+        }),
+    });
+    rng_lib.addCSourceFiles(.{
+        .files = &[_][]const u8{"libs/rng/rng.c"},
+        .flags = &c_flags,
+    });
+    rng_lib.addIncludePath(b.path("libs/rng"));
+
+    // Map library
+    const map_lib = b.addLibrary(.{
+        .name = "map",
+        .root_module = b.createModule(.{
+            .target = target,
+            .optimize = optimize,
+            .link_libc = true,
+        }),
+    });
+    map_lib.addCSourceFiles(.{
+        .files = &[_][]const u8{
+            "libs/map/map.c",
+            "libs/map/utils.c",
+        },
+        .flags = &c_flags,
+    });
+    // map.h includes common.h and settings.h which live in src/
+    map_lib.addIncludePath(b.path("src"));
+    // map.c includes rng/rng.h via libs/ root
+    map_lib.addIncludePath(b.path("libs"));
+    // utils.h is co-located with map.c
+    map_lib.addIncludePath(b.path("libs/map"));
+    map_lib.linkLibrary(rng_lib);
+    // map.c doesn't call raylib, but common.h (via map.h) includes raylib.h;
+    // add the include path without linking the library into the static archive
+    const raylib_include = std.mem.trim(u8, b.run(&.{ "pkg-config", "--variable=includedir", "raylib" }), "\n ");
+    map_lib.addSystemIncludePath(.{ .cwd_relative = raylib_include });
+
     // Zig combat library
     const combat_lib = b.addLibrary(.{
         .name = "combat",
@@ -14,29 +64,22 @@ pub fn build(b: *std.Build) void {
             .link_libc = true,
         }),
     });
+    // common.h and settings.h live in src/; rng.h exposed bare from libs/rng
     combat_lib.addIncludePath(b.path("src"));
+    combat_lib.addIncludePath(b.path("libs/rng"));
+    combat_lib.linkLibrary(rng_lib);
     combat_lib.linkSystemLibrary("raylib");
 
-    // C sources (everything except combat, which is now Zig)
+    // C sources remaining in src/
     const c_sources = [_][]const u8{
         "src/audio.c",
         "src/enemy.c",
         "src/items.c",
         "src/main.c",
-        "src/map.c",
-        "src/player.c",
         "src/movement.c",
+        "src/player.c",
         "src/render.c",
-        "src/rng.c",
         "src/settings.c",
-        "src/utils.c",
-    };
-
-    const c_flags = [_][]const u8{
-        "-std=c99",
-        "-Wall",
-        "-Wextra",
-        "-O2",
     };
 
     // Main executable
@@ -54,7 +97,12 @@ pub fn build(b: *std.Build) void {
         .flags = &c_flags,
     });
 
+    // src/ for own headers; libs/ so "rng/rng.h" and "map/map.h" resolve
     exe.addIncludePath(b.path("src"));
+    exe.addIncludePath(b.path("libs"));
+
+    exe.linkLibrary(rng_lib);
+    exe.linkLibrary(map_lib);
     exe.linkLibrary(combat_lib);
     exe.linkSystemLibrary("raylib");
     exe.linkSystemLibrary("m");

libs/map/map.c

@@ -1,5 +1,5 @@
 #include "map.h"
-#include "rng.h"
+#include "rng/rng.h"
 #include "settings.h"
 #include "utils.h"
 #include <stdlib.h>

src/enemy.c

@@ -1,9 +1,9 @@
 #include "enemy.h"
 #include "combat.h"
 #include "common.h"
-#include "map.h"
+#include "map/map.h"
 #include "movement.h"
-#include "rng.h"
+#include "rng/rng.h"
 #include "settings.h"
 #include <string.h>
 

src/items.c

@@ -1,6 +1,6 @@
 #include "common.h"
-#include "map.h"
+#include "map/map.h"
-#include "rng.h"
+#include "rng/rng.h"
 #include "settings.h"
 #include <stddef.h>
 

src/main.c

@@ -3,12 +3,12 @@
 #include "common.h"
 #include "enemy.h"
 #include "items.h"
-#include "map.h"
+#include "map/map.h"
 #include "movement.h"
 #include "player.h"
 #include "raylib.h"
 #include "render.h"
-#include "rng.h"
+#include "rng/rng.h"
 #include "settings.h"
 #include <ctype.h>
 #include <stddef.h>

src/movement.c

@@ -1,6 +1,6 @@
 #include "movement.h"
 #include "enemy.h"
-#include "map.h"
+#include "map/map.h"
 #include <stdbool.h>
 
 // Check if position is occupied by player