Don't require fire as base dependency and add lightning_tools[dev] installation

.github/workflows/ci-testing.yml

@@ -29,7 +29,7 @@ jobs:
  - name: Set oldest dependencies
  if: matrix.requires == 'oldest'
  run: |
- pip install -e .
+ pip install -e '.[dev]'
  python -m lightning_utilities.dev requirements set-oldest
 
  - uses: ./.github/actions/cache

README.md

@@ -56,7 +56,7 @@ jobs:
  # requires: latest
 ```
 
-## 3. CLI
+## 3. CLI `lightning_utilities.dev`
 
 The package provides common CLI commands.
 
@@ -71,7 +71,7 @@ pip install https://github.com/Lightning-AI/utilities/archive/refs/heads/main.zi
 From pypi:
 
 ```bash
-pip install lightning_utilities
+pip install lightning_utilities[dev]
 ```
 
 </details>
@@ -102,3 +102,27 @@ pytest-timeout
 ```
 
 </details>
+
+## 4. General Python utilities `lightning_utilities.core`
+
+<details>
+ <summary>Installation</summary>
+
+From pypi:
+
+```bash
+pip install lightning_utilities
+```
+
+</details>
+
+__Usage:__
+
+Example for optional imports:
+
+```python
+from lightning_utilities.core.imports import module_available
+
+if module_available("some_package.something"):
+ from some_package import something
+```

requirements/base.txt

@@ -1 +0,0 @@
-fire

requirements/dev.txt

@@ -0,0 +1 @@
+fire

setup.py

@@ -21,6 +21,8 @@ def _load_py_module(fname, pkg="lightning_utilities"):
 about = _load_py_module("__about__.py")
 with open(os.path.join(_PATH_REQUIRE, "base.txt")) as fp:
  requirements = list(map(str, parse_requirements(fp.readline())))
+with open(os.path.join(_PATH_REQUIRE, "dev.txt")) as fp:
+ requirements_dev = list(map(str, parse_requirements(fp.readline())))
 with open(os.path.join(_PATH_ROOT, "README.md")) as fp:
  readme = fp.read()
 
@@ -43,6 +45,9 @@ def _load_py_module(fname, pkg="lightning_utilities"):
  python_requires=">=3.7",
  setup_requires=[],
  install_requires=requirements,
+ extras_require={
+ "dev": requirements_dev,
+ },
  project_urls={
  "Bug Tracker": "https://github.com/Lightning-AI/utilities/issues",
  "Documentation": "https://dev-toolbox.rtfd.io/en/latest/", # TODO: Update domain