Use src for Python source directory

`src` is a blessed project layout directory for source files, and most
tools support it.

This layout also decreases complexity in the Makefile.

Module and namespace directories will go inside it.

.github/workflows/tests.yml

@@ -23,7 +23,7 @@ jobs:
         run: |
           cookiecutter --no-input -o /tmp .
 
-          [[ -d /tmp/python-project/python_project ]] || { >&2 echo "not generated?"; exit 1; }
+          [[ -d /tmp/python-project/src/python_project ]] || { >&2 echo "not generated?"; exit 1; }
 
           cd /tmp/python-project
           make dev
@@ -53,7 +53,7 @@ jobs:
         run: |
           cookiecutter --no-input -o /tmp . project_namespace_import=tob.r_and_e
 
-          [[ -d /tmp/tob-r-and-e-python-project/tob/r_and_e/python_project ]] || { >&2 echo "not generated?"; exit 1; }
+          [[ -d /tmp/tob-r-and-e-python-project/src/tob/r_and_e/python_project ]] || { >&2 echo "not generated?"; exit 1; }
 
           cd /tmp/tob-r-and-e-python-project
           make dev
@@ -68,7 +68,7 @@ jobs:
         run: |
           cookiecutter --no-input -o /tmp . project_namespace_import=tob.r_and_e "project_name=Bit Trails" project_slug=bit-trails
 
-          [[ -d /tmp/bit-trails/tob/r_and_e/bit_trails ]] || { >&2 echo "not generated?"; exit 1; }
+          [[ -d /tmp/bit-trails/src/tob/r_and_e/bit_trails ]] || { >&2 echo "not generated?"; exit 1; }
 
           cd /tmp/bit-trails
           make dev

cookiecutter.json

@@ -6,7 +6,7 @@
     "__project_namespace_slug": "{{ cookiecutter.project_namespace_import.replace('_', '-').replace('.', '-') }}",
     "project_slug": "{{ (cookiecutter.__project_namespace_slug + '-' if cookiecutter.project_namespace_import else '') + cookiecutter.__module_slug }}",
     "__project_import": "{{ (cookiecutter.project_namespace_import + '.' if cookiecutter.project_namespace_import else '') + cookiecutter.__module_import }}",
-    "__project_src_path": "{{ cookiecutter.__project_import.replace('.', '/') }}",
+    "__project_src_path": "src/{{ cookiecutter.__project_import.replace('.', '/') }}",
     "project_description": "",
     "repo_type": [
         "CLI",

hooks/post_gen_project.py

@@ -20,6 +20,6 @@
     os.getcwd(), "{{ cookiecutter.__project_src_path }}"
 )
 if not os.path.exists(namespace_project_dir):
-    module_dir = os.path.join(os.getcwd(), "{{ cookiecutter.__module_import }}")
+    module_dir = os.path.join(os.getcwd(), "src", "{{ cookiecutter.__module_import }}")
     os.makedirs(namespace_project_dir)
     os.rename(module_dir, os.path.join(namespace_project_dir))

{{cookiecutter.project_slug}}/Makefile

@@ -1,9 +1,8 @@
 SHELL := /bin/bash
 
-PY_SRC_DIR = {{ cookiecutter.__project_src_path }}
 PY_IMPORT = {{ cookiecutter.__project_import }}
 
-ALL_PY_SRCS := $(shell find $(PY_SRC_DIR) -name '*.py') \
+ALL_PY_SRCS := $(shell find src -name '*.py') \
 	$(shell find test -name '*.py')
 
 # Optionally overriden by the user, if they're using a virtual environment manager.

{{cookiecutter.project_slug}}/pyproject.toml

@@ -68,6 +68,7 @@ line-length = 100
 omit = ["{{ cookiecutter.__project_src_path }}/_cli.py"]
 
 [tool.mypy]
+mypy_path = "src"
 packages = "{{ cookiecutter.__project_import }}"
 allow_redefinition = true
 check_untyped_defs = true