[esp32] Support esphome idedata with the native ESP-IDF toolchain (#17040)

esphome/__main__.py

@@ -1771,6 +1771,21 @@ def command_update_all(args: ArgsProtocol) -> int | None:
 def command_idedata(args: ArgsProtocol, config: ConfigType) -> int:
     import json
 
+    if CORE.using_toolchain_esp_idf:
+        # Native ESP-IDF derives idedata from the build's compile_commands.json,
+        # so the configuration must already be compiled.
+        from esphome.espidf import toolchain as espidf_toolchain
+
+        idedata = espidf_toolchain.get_idedata()
+        if idedata is None:
+            _LOGGER.error(
+                "No idedata available; compile the configuration first",
+            )
+            return 1
+
+        print(json.dumps(idedata, indent=2) + "\n")
+        return 0
+
     if not CORE.using_toolchain_platformio:
         _LOGGER.error(
             "The idedata command is not compatible with %s toolchain",

esphome/espidf/toolchain.py

@@ -472,6 +472,7 @@ def get_idedata() -> dict | None:
             pass
 
     data = idedata_from_build(compile_commands)
+    data["prog_path"] = str(get_elf_path())
     cache.parent.mkdir(parents=True, exist_ok=True)
     cache.write_text(json.dumps(data, indent=2) + "\n", encoding="utf-8")
     return data

tests/unit_tests/test_espidf_toolchain.py

@@ -89,8 +89,9 @@ def test_get_idedata_generates_and_caches(setup_core: Path) -> None:
         result = toolchain.get_idedata()
 
     mock_transform.assert_called_once()
-    assert result == {"cxx_path": "g++"}
+    prog_path = str(toolchain.get_elf_path())
-    assert json.loads(cache.read_text()) == {"cxx_path": "g++"}
+    assert result == {"cxx_path": "g++", "prog_path": prog_path}
+    assert json.loads(cache.read_text()) == {"cxx_path": "g++", "prog_path": prog_path}
 
 
 def test_get_idedata_uses_cache_when_valid(setup_core: Path) -> None:
@@ -127,7 +128,7 @@ def test_get_idedata_regenerates_when_compile_commands_newer(setup_core: Path) -
         result = toolchain.get_idedata()
 
     mock_transform.assert_called_once()
-    assert result == {"cxx_path": "fresh"}
+    assert result == {"cxx_path": "fresh", "prog_path": str(toolchain.get_elf_path())}
 
 
 def test_get_idedata_regenerates_on_corrupted_cache(setup_core: Path) -> None:
@@ -147,7 +148,26 @@ def test_get_idedata_regenerates_on_corrupted_cache(setup_core: Path) -> None:
         result = toolchain.get_idedata()
 
     mock_transform.assert_called_once()
-    assert result == {"cxx_path": "regen"}
+    assert result == {"cxx_path": "regen", "prog_path": str(toolchain.get_elf_path())}
+
+
+def test_get_idedata_prog_path_points_at_firmware_elf(setup_core: Path) -> None:
+    """The idedata exposes prog_path (the ELF) so consumers like build-action
+    can locate firmware.factory.bin / firmware.ota.bin as its siblings."""
+    compile_commands, _ = _setup_build(setup_core)
+    compile_commands.parent.mkdir(parents=True, exist_ok=True)
+    compile_commands.write_text("[]")
+
+    with patch(
+        "esphome.espidf.idedata.idedata_from_build",
+        return_value={"cxx_path": "g++"},
+    ):
+        result = toolchain.get_idedata()
+
+    # Use Path semantics so the contract holds on Windows too (backslashes).
+    prog_path = Path(result["prog_path"])
+    assert prog_path.name == "firmware.elf"
+    assert prog_path.parent.name == "build"
 
 
 def test_get_idf_env_sets_git_ceiling_directories(setup_core: Path) -> None:

tests/unit_tests/test_main.py

@@ -32,6 +32,7 @@ from esphome.__main__ import (
     command_clean_all,
     command_config,
     command_config_hash,
+    command_idedata,
     command_rename,
     command_run,
     command_update_all,
@@ -6257,3 +6258,28 @@ def test_command_run_defaults_subscribe_states_true(
     mock_run_logs.assert_called_once_with(
         CORE.config, ["192.168.1.100"], subscribe_states=True
     )
+
+
+def test_command_idedata_esp_idf_prints_json(capsys: CaptureFixture) -> None:
+    """Under the native ESP-IDF toolchain, idedata is emitted as JSON."""
+    setup_core()
+    CORE.toolchain = Toolchain.ESP_IDF
+    data = {"cxx_path": "g++", "prog_path": "/build/firmware.elf"}
+
+    with patch("esphome.espidf.toolchain.get_idedata", return_value=data) as mock_get:
+        result = command_idedata(MagicMock(), CORE.config)
+
+    assert result == 0
+    mock_get.assert_called_once_with()
+    assert json.loads(capsys.readouterr().out) == data
+
+
+def test_command_idedata_esp_idf_no_build_errors() -> None:
+    """Under ESP-IDF, a missing build (no idedata) returns an error, not a crash."""
+    setup_core()
+    CORE.toolchain = Toolchain.ESP_IDF
+
+    with patch("esphome.espidf.toolchain.get_idedata", return_value=None):
+        result = command_idedata(MagicMock(), CORE.config)
+
+    assert result == 1