🐛 Fix sourcing of completion path for Git Bash (#801)

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

Author: 3 people

typer/_completion_shared.py

@@ -100,13 +100,13 @@ def install_bash(*, prog_name: str, complete_var: str, shell: str) -> Path:
     # It seems bash-completion is the official completion system for bash:
     # Ref: https://www.gnu.org/software/bash/manual/html_node/A-Programmable-Completion-Example.html
     # But installing in the locations from the docs doesn't seem to have effect
-    completion_path = Path.home() / f".bash_completions/{prog_name}.sh"
+    completion_path = Path.home() / ".bash_completions" / f"{prog_name}.sh"
     rc_path = Path.home() / ".bashrc"
     rc_path.parent.mkdir(parents=True, exist_ok=True)
     rc_content = ""
     if rc_path.is_file():
         rc_content = rc_path.read_text()
-    completion_init_lines = [f"source {completion_path}"]
+    completion_init_lines = [f"source '{completion_path}'"]
     for line in completion_init_lines:
         if line not in rc_content:  # pragma: no cover
             rc_content += f"\n{line}"