fix: validate the project name when running pdm init (pdm-project#2402)

* Issues 2360 (pdm-project#1)

* bugfix: pdm-project#2360

* refactor: typo and code

* [pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci

* Issues 2360 (pdm-project#2)

* bugfix: pdm-project#2360

* docs: 2360.bugfix.md

* docs: 2360.bugfix.md

---------

Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>

news/2360.bugfix.md

@@ -0,0 +1 @@
+ prevent wrong project name (including space and illegal characters) 

src/pdm/cli/commands/init.py

@@ -14,7 +14,7 @@
 from pdm.models.python import PythonInfo
 from pdm.models.specifiers import get_specifier
 from pdm.models.venv import get_venv_python
-from pdm.utils import get_user_email_from_git, package_installed
+from pdm.utils import get_user_email_from_git, package_installed, sanitize_project_name, validate_project_name
 
 if TYPE_CHECKING:
     from pdm.project import Project
@@ -90,6 +90,18 @@ def ask(self, question: str, default: str) -> str:
             return default
         return termui.ask(question, default=default)
 
+    def ask_project(self, project: Project) -> str:
+        default = sanitize_project_name(project.root.name)
+        name = self.ask("Project name", default)
+        if default == name or validate_project_name(name):
+            return name
+        project.core.ui.echo(
+            "Project name is not valid, it should follow PEP 426",
+            err=True,
+            style="warning",
+        )
+        return self.ask_project(project)
+
     def get_metadata_from_input(self, project: Project, options: argparse.Namespace) -> dict[str, Any]:
         from pdm.formats.base import array_of_inline_tables, make_array, make_inline_table
 
@@ -102,7 +114,7 @@ def get_metadata_from_input(self, project: Project, options: argparse.Namespace)
             )
         build_backend: type[BuildBackend] | None = None
         if is_library:
-            name = self.ask("Project name", project.root.name)
+            name = self.ask_project(project)
             version = self.ask("Project version", "0.1.0")
             description = self.ask("Project description", "")
             if options.backend:

src/pdm/utils.py

@@ -453,3 +453,16 @@ def package_installed(package_name: str) -> bool:
         return False
     else:
         return True
+
+
+def validate_project_name(name: str) -> bool:
+    """Check if the project name is valid or not"""
+
+    pattern = r"^([A-Z0-9]|[A-Z0-9][A-Z0-9._-]*[A-Z0-9])$"
+    return re.fullmatch(pattern, name, flags=re.IGNORECASE) is not None
+
+
+def sanitize_project_name(name: str) -> str:
+    """Sanitize the project name and remove all illegal characters"""
+    pattern = r"[^a-zA-Z0-9\-_\.]"
+    return re.sub(pattern, "", name)