feat(projects): 新增Click综合案例示例代码及素材

projects/click-cli/basic/fake_pip_cli.py

@@ -0,0 +1,80 @@
+import argparse
+from importlib.metadata import requires
+
+
+def fetch(target):
+    print(f"fetch {target}...")
+
+
+def is_url(src):
+    if not (src.startswith("http") and src.startswith("https")):
+        return False
+    return True
+
+
+def download(url_or_package):
+    if not is_url(url_or_package):
+        fetch(url_or_package)
+        return
+
+
+def _install(package=None, requirements=None):
+    if not package and requirements:
+        for _package in requirements:
+            download(_package)
+    elif package and not requirements:
+        download(package)
+    else:
+        raise ValueError(
+            "`package` parameter is required "
+            "if there isn't `requirements` parameter."
+        )
+
+
+class PipCommand:
+    def __init__(self) -> None:
+        pass
+
+    def install(self, *args, **kwargs):
+        _install(*args, **kwargs)
+
+
+def _tidy_requirements(requirements):
+    filtered = filter(lambda r: not r.startswith("#") and r.strip() != "", requirements)
+    keep = list(map(lambda r: r.strip(), filtered))
+    return keep
+
+
+def main():
+    parser = argparse.ArgumentParser(
+        description="the fake pip usage example",
+    )
+    subparsers = parser.add_subparsers(
+        description="the sub-command for fake pip tools",
+    )
+
+    parser_install = subparsers.add_parser("install")
+    parser_install.add_argument(
+        "package",
+        type=str,
+        nargs="?",
+        help="the name of package",
+    )
+    parser_install.add_argument(
+        "-r",
+        "--requirements",
+        dest="requirements",
+        help="the requirements file",
+        type=argparse.FileType("r", encoding="utf-8"),
+    )
+
+    args = parser.parse_args()
+    deps = (
+        _tidy_requirements(args.requirements.readlines()) if args.requirements else None
+    )
+    pip = PipCommand()
+    pip.install(args.package, deps)
+
+
+if __name__ == '__main__':
+    main()