mintro: Add name of subproject the target is contained in to --target output

docs/markdown/IDE-integration.md

@@ -54,6 +54,7 @@ for one target is defined as follows:
     "id": "The internal ID meson uses",
     "type": "<TYPE>",
     "defined_in": "/Path/to/the/targets/meson.build",
+    "subproject": null,
     "filename": ["list", "of", "generated", "files"],
     "build_by_default": true / false,
     "target_sources": [],
@@ -66,6 +67,9 @@ be present. It stores the installation location for each file in `filename`.
 If one file in `filename` is not installed, its corresponding install location
 is set to `null`.
 
+The `subproject' key specifies the name of the subproject this target was
+defined in, or `null` if the target was defined in the top level project.
+
 A target usually generates only one file. However, it is possible for custom
 targets to have multiple outputs.
 

docs/markdown/snippets/introspect_multiple.md

@@ -20,4 +20,5 @@ Additionlly the format of `meson introspect target` was changed:
 
   - New: the `sources` key. It stores the source files of a target and their compiler parameters.
   - New: the `defined_in` key. It stores the meson file where a target is defined
+  - New: the `subproject` key. It stores the name of the subproject where a target is defined.
   - Added new target types (`jar`, `shared module`).

mesonbuild/mintro.py

@@ -135,7 +135,8 @@ def list_targets(builddata: build.Build, installdata, backend: backends.Backend)
             'defined_in': os.path.normpath(os.path.join(src_dir, target.subdir, 'meson.build')),
             'filename': [os.path.join(build_dir, target.subdir, x) for x in target.get_outputs()],
             'build_by_default': target.build_by_default,
-            'target_sources': backend.get_introspection_data(idname, target)
+            'target_sources': backend.get_introspection_data(idname, target),
+            'subproject': target.subproject or None
         }
 
         if installdata and target.should_install():

run_unittests.py

@@ -3236,6 +3236,21 @@ recommended as it is not supported on some platforms''')
         }
         self.assertDictEqual(res, expected)
 
+    def test_introspection_target_subproject(self):
+        testdir = os.path.join(self.common_test_dir, '46 subproject')
+        self.init(testdir)
+        res = self.introspect('--targets')
+
+        expected = {
+            'sublib': 'sublib',
+            'simpletest': 'sublib',
+            'user': None
+        }
+
+        for entry in res:
+            name = entry['name']
+            self.assertEquals(entry['subproject'], expected[name])
+
     @skipIfNoExecutable('clang-format')
     def test_clang_format(self):
         if self.backend is not Backend.ninja: