[FL-3437] fbt: build target for faps (#2888)

* fbt: added build target for faps. Usage: ./fbt build APPSRC=<appid>
* Updated docs & vscode config
* Code cleanup

scripts/fbt_tools/fbt_extapps.py

@@ -3,7 +3,7 @@ import os
 import pathlib
 import shutil
 from dataclasses import dataclass, field
-from typing import Optional
+from typing import Optional, Dict, List
 
 import SCons.Warnings
 from ansi.color import fg
@@ -400,22 +400,26 @@ def generate_embed_app_metadata_actions(source, target, env, for_signature):
     return Action(actions)
 
 
-def AddAppLaunchTarget(env, appname, launch_target_name):
-    deploy_sources, flipp_dist_paths, validators = [], [], []
-    run_script_extra_ars = ""
+@dataclass
+class AppDeploymentComponents:
+    deploy_sources: Dict[str, object] = field(default_factory=dict)
+    validators: List[object] = field(default_factory=list)
+    extra_launch_args: str = ""
 
-    def _add_dist_targets(app_artifacts):
-        validators.append(app_artifacts.validator)
+    def add_app(self, app_artifacts):
         for _, ext_path in app_artifacts.dist_entries:
-            deploy_sources.append(app_artifacts.compact)
-            flipp_dist_paths.append(f"/ext/{ext_path}")
-        return app_artifacts
+            self.deploy_sources[f"/ext/{ext_path}"] = app_artifacts.compact
+        self.validators.append(app_artifacts.validator)
+
+
+def _gather_app_components(env, appname) -> AppDeploymentComponents:
+    components = AppDeploymentComponents()
 
     def _add_host_app_to_targets(host_app):
         artifacts_app_to_run = env["EXT_APPS"].get(host_app.appid, None)
-        _add_dist_targets(artifacts_app_to_run)
+        components.add_app(artifacts_app_to_run)
         for plugin in host_app._plugins:
-            _add_dist_targets(env["EXT_APPS"].get(plugin.appid, None))
+            components.add_app(env["EXT_APPS"].get(plugin.appid, None))
 
     artifacts_app_to_run = env.GetExtAppByIdOrPath(appname)
     if artifacts_app_to_run.app.apptype == FlipperAppType.PLUGIN:
@@ -427,25 +431,35 @@ def AddAppLaunchTarget(env, appname, launch_target_name):
                 FlipperAppType.EXTERNAL,
                 FlipperAppType.MENUEXTERNAL,
             ]:
-                _add_host_app_to_targets(host_app)
+                components.add_app(host_app)
             else:
                 # host app is a built-in app
-                run_script_extra_ars = f"-a {host_app.name}"
-                _add_dist_targets(artifacts_app_to_run)
+                components.add_app(artifacts_app_to_run)
+                components.extra_launch_args = f"-a {host_app.name}"
         else:
             raise UserError("Host app is unknown")
     else:
         _add_host_app_to_targets(artifacts_app_to_run.app)
+    return components
 
-    # print(deploy_sources, flipp_dist_paths)
-    env.PhonyTarget(
+
+def AddAppLaunchTarget(env, appname, launch_target_name):
+    components = _gather_app_components(env, appname)
+    target = env.PhonyTarget(
         launch_target_name,
         '${PYTHON3} "${APP_RUN_SCRIPT}" -p ${FLIP_PORT} ${EXTRA_ARGS} -s ${SOURCES} -t ${FLIPPER_FILE_TARGETS}',
-        source=deploy_sources,
-        FLIPPER_FILE_TARGETS=flipp_dist_paths,
-        EXTRA_ARGS=run_script_extra_ars,
+        source=components.deploy_sources.values(),
+        FLIPPER_FILE_TARGETS=components.deploy_sources.keys(),
+        EXTRA_ARGS=components.extra_launch_args,
     )
-    env.Alias(launch_target_name, validators)
+    env.Alias(launch_target_name, components.validators)
+    return target
+
+
+def AddAppBuildTarget(env, appname, build_target_name):
+    components = _gather_app_components(env, appname)
+    env.Alias(build_target_name, components.validators)
+    env.Alias(build_target_name, components.deploy_sources.values())
 
 
 def generate(env, **kw):
@@ -474,6 +488,7 @@ def generate(env, **kw):
     env.AddMethod(BuildAppElf)
     env.AddMethod(GetExtAppByIdOrPath)
     env.AddMethod(AddAppLaunchTarget)
+    env.AddMethod(AddAppBuildTarget)
 
     env.Append(
         BUILDERS={