Allow selectors and '@' index selection

Also, trim `-e` from start but otherwise allow it

assets/pip-audit.py

@@ -96,9 +96,12 @@ def install_commands(lock_path: str) -> Iterator[tuple[list[str], int]]:
             while line.endswith("\\"):
                 zero_indexed_lineno += 1
                 line = line[:-1].strip() + " " + lock_file_lines[zero_indexed_lineno]
-            # There could be quoted or escaped spaces, but unlikely in 1st word.
-            install_cmd = [line.strip().split(" ", 1)[0]]
-            yield (install_cmd, zero_indexed_lineno + 1)
+            # There could be quoted or escaped spaces, but unlikely to be affected.
+            # Ignore --hash= and anything commented out but allow @ and ;sys_platform
+            install_cmd = line.strip().split("#", 1)[0].split(" --", 1)[0].strip()
+            if install_cmd.startswith("-e "):
+                install_cmd = install_cmd[3:].strip()
+            yield ([install_cmd], zero_indexed_lineno + 1)
         zero_indexed_lineno += 1
 
 if __name__ == "__main__":