fix: add error handling for missing input files

Display human-readable errors when the markdown file, photo, or
signature cannot be found instead of failing with a stack trace.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

main.py

@@ -15,7 +15,16 @@ def generate(
     ),
 ) -> None:
     """Generate a PDF CV from a Markdown file with YAML frontmatter."""
-    result = generate_pdf(input_file, output_file)
+    if not input_file.exists():
+        typer.echo(f"Error: Markdown file not found: {input_file}", err=True)
+        raise typer.Exit(1)
+
+    try:
+        result = generate_pdf(input_file, output_file)
+    except FileNotFoundError as e:
+        typer.echo(f"Error: {e}", err=True)
+        raise typer.Exit(1)
+
     typer.echo(f"Generated {result}")
 
 

src/cv_generator/generator.py

@@ -17,8 +17,16 @@ def generate_pdf(input_file: Path, output_file: Path | None = None) -> Path:
     letter_body: str = markdown.markdown(post.content)
 
     input_dir = Path(input_file).resolve().parent
-    cv.photo = str(input_dir / cv.photo)
-    cv.signature = str(input_dir / cv.signature)
+    photo_path = input_dir / cv.photo
+    signature_path = input_dir / cv.signature
+
+    if not photo_path.exists():
+        raise FileNotFoundError(f"Photo not found: {photo_path}")
+    if not signature_path.exists():
+        raise FileNotFoundError(f"Signature not found: {signature_path}")
+
+    cv.photo = str(photo_path)
+    cv.signature = str(signature_path)
 
     env = Environment(loader=FileSystemLoader(str(SRC_DIR)))
     template = env.get_template("cv.html.j2")