Refactor asset packs to build properly with fbt

scripts/fbt_tools/fbt_assets.py

@@ -67,6 +67,28 @@ def _dolphin_emitter(target, source, env):
     return target, source
 
 
+def _packs_emitter(target, source, env):
+    source_dir = source[0]
+    target_dir = target[0]
+    env.Replace(_PACKS_OUT_DIR=target_dir)
+    env.Replace(_PACKS_SRC_DIR=source_dir)
+
+    target = [
+        target_dir.File(source_dir.rel_path(node))
+        for node in env.GlobRecursive("*/Anims/manifest.txt", source_dir.srcnode())
+    ]
+    target.extend(
+        target_dir.File(source_dir.rel_path(node).removesuffix(".png") + ".bm")
+        for node in env.GlobRecursive("*/Anims/**/*.png", source_dir.srcnode())
+    )
+    target.extend(
+        target_dir.File(source_dir.rel_path(node).removesuffix(".png") + ".bmx")
+        for node in env.GlobRecursive("*/Icons/**/*.png", source_dir.srcnode())
+    )
+
+    return target, source
+
+
 def __invoke_git(args, source_dir):
     cmd = ["git"]
     cmd.extend(args)
@@ -146,6 +168,7 @@ def generate(env):
             ICONSCOMSTR="\tICONS\t${TARGET}",
             PROTOCOMSTR="\tPROTO\t${SOURCE}",
             DOLPHINCOMSTR="\tDOLPHIN\t${DOLPHIN_RES_TYPE}",
+            PACKSCOMSTR="\tPACKS\t${SOURCE}",
             PBVERCOMSTR="\tPBVER\t${TARGET}",
         )
 
@@ -218,6 +241,21 @@ def generate(env):
                 ),
                 emitter=_dolphin_emitter,
             ),
+            "AssetPacksBuilder": Builder(
+                action=Action(
+                    [
+                        [
+                            "${PYTHON3}",
+                            "${ASSETS_COMPILER}",
+                            "packs",
+                            "${_PACKS_SRC_DIR}",
+                            "${_PACKS_OUT_DIR}",
+                        ],
+                    ],
+                    "${PACKSCOMSTR}",
+                ),
+                emitter=_packs_emitter,
+            ),
             "ProtoVerBuilder": Builder(
                 action=Action(
                     _proto_ver_generator,