From e62593cfbc47c48c06dfb4946279f4e2c63407f2 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?St=C3=A9phane=20Bidoul?= <stephane.bidoul@gmail.com>
Date: Sat, 11 Feb 2023 17:08:12 +0100
Subject: [PATCH] Support pyproject.toml without build system to detect project
 name

---
 news/84.feature                    |  1 +
 src/pip_deepfreeze/project_name.py |  3 +--
 tests/test_project_name.py         | 16 ++++++++++++++++
 3 files changed, 18 insertions(+), 2 deletions(-)
 create mode 100644 news/84.feature

diff --git a/news/84.feature b/news/84.feature
new file mode 100644
index 0000000..7349f9f
--- /dev/null
+++ b/news/84.feature
@@ -0,0 +1 @@
+Support pyproject.toml without build system to detect project name.
diff --git a/src/pip_deepfreeze/project_name.py b/src/pip_deepfreeze/project_name.py
index 9a6ec29..45ce221 100644
--- a/src/pip_deepfreeze/project_name.py
+++ b/src/pip_deepfreeze/project_name.py
@@ -94,9 +94,8 @@ def get_project_name_from_pyproject_toml_pep621(
     pyproject_toml: Optional[PyProjectToml],
 ) -> Optional[str]:
     log_info(".", nl=False)
-    if not _get_build_backend(pyproject_toml):
+    if not pyproject_toml:
         return None
-    assert pyproject_toml
     project_name = pyproject_toml.get("project", {}).get("name")
     if not project_name:
         return None
diff --git a/tests/test_project_name.py b/tests/test_project_name.py
index 5ca27a0..31cef90 100644
--- a/tests/test_project_name.py
+++ b/tests/test_project_name.py
@@ -110,6 +110,22 @@ def test_get_project_name_from_pyproject_toml_pep621_no_project(tmp_path):
     )
 
 
+def test_get_project_name_from_pyproject_toml_pep621_no_build_system(tmp_path):
+    (tmp_path / "pyproject.toml").write_text(
+        textwrap.dedent(
+            """\
+            [project]
+            name = "theproject"
+            """
+        )
+    )
+    assert (
+        get_project_name_from_pyproject_toml_pep621(_load_pyproject_toml(tmp_path))
+        == "theproject"
+    )
+    assert get_project_name(sys.executable, tmp_path) == "theproject"
+
+
 def test_project_name_from_pep517_setup_py(tmp_path):
     setup_py = tmp_path / "setup.py"
     setup_py.write_text(