fn parse_args()

in tools/rustdoc/rustdoc_test_writer.rs [27:90]

• 49 lines of code
• 1 McCabe index (conditional complexity)

fn parse_args() -> Options {
    let args: Vec<String> = env::args().into_iter().collect();
    let (writer_args, action_args) = {
        let split = args
            .iter()
            .position(|arg| arg == "--")
            .expect("Unable to find split identifier `--`");

        // Converting each set into a vector makes them easier to parse in
        // the absence of nightly features
        let (writer, action) = args.split_at(split);
        (writer.to_vec(), action.to_vec())
    };

    // Remove the leading `--` which is expected to be the first
    // item in `action_args`
    debug_assert_eq!(action_args[0], "--");
    let action_argv = action_args[1..].to_vec();

    let output = writer_args
        .iter()
        .find(|arg| arg.starts_with("--output="))
        .and_then(|arg| arg.splitn(2, '=').last())
        .map(PathBuf::from)
        .expect("Missing `--output` argument");

    let (strip_substring_args, writer_args): (Vec<String>, Vec<String>) = writer_args
        .into_iter()
        .partition(|arg| arg.starts_with("--strip_substring="));

    let mut strip_substrings: Vec<String> = strip_substring_args
        .into_iter()
        .map(|arg| {
            arg.splitn(2, '=')
                .last()
                .expect("--strip_substring arguments must have assignments using `=`")
                .to_owned()
        })
        .collect();

    // Strip substrings should always be in reverse order of the length of each
    // string so when filtering we know that the longer strings are checked
    // first in order to avoid cases where shorter strings might match longer ones.
    strip_substrings.sort_by_key(|b| Reverse(b.len()));
    strip_substrings.dedup();

    let env_keys = writer_args
        .into_iter()
        .filter(|arg| arg.starts_with("--action_env="))
        .map(|arg| {
            arg.splitn(2, '=')
                .last()
                .expect("--env arguments must have assignments using `=`")
                .to_owned()
        })
        .collect();

    Options {
        env_keys,
        strip_substrings,
        output,
        action_argv,
    }
}