Repository: alacritty/alacritty
File: alacritty/src/cli.rs (Rust)

Code before:
    }

    yaml_text += &closing_brackets;

    serde_yaml::from_str(&yaml_text)
}

/// Parse the class CLI parameter.
fn parse_class(input: &str) -> Result<Class, String> {
    match input.find(',') {
        Some(position) => {
            let general = input[position + 1..].to_owned();

            // Warn the user if they've passed too many values.
            if general.contains(',') {
                return Err(String::from("Too many parameters"));
            }

            Ok(Class { instance: input[..position].into(), general })
        },
        None => Ok(Class { instance: input.into(), general: DEFAULT_NAME.into() }),
    }
}

/// Convert to hex if possible, else decimal
fn parse_hex_or_decimal(input: &String) -> Option<u64> {
    input
        .starts_with("0x")
        .then(|| u64::from_str_radix(&input[2..], 16).ok())
        .unwrap_or_else(|| input.parse().ok())
}

/// Terminal specific cli options which can be passed to new windows via IPC.
#[derive(Serialize, Deserialize, Args, Default, Debug, Clone, PartialEq, Eq)]
pub struct TerminalOptions {
    /// Start the shell in the specified working directory.
    #[clap(long, value_hint = ValueHint::FilePath)]
    pub working_directory: Option<PathBuf>,

    /// Remain open after child process exit.
    #[clap(long)]
    pub hold: bool,

    /// Command and args to execute (must be last argument).
    #[clap(short = 'e', long, allow_hyphen_values = true, multiple_values = true)]
    command: Vec<String>,
}

impl TerminalOptions {
    /// Shell override passed through the CLI.
    pub fn command(&self) -> Option<Program> {

Review comment (suggestion):
```suggestion
fn parse_hex_or_decimal(input: &str) -> Option<u64> {
```

Code after:
        }
    }

    yaml_text += &closing_brackets;

    serde_yaml::from_str(&yaml_text)
}

/// Parse the class CLI parameter.
fn parse_class(input: &str) -> Result<Class, String> {
    match input.find(',') {
        Some(position) => {
            let general = input[position + 1..].to_owned();

            // Warn the user if they've passed too many values.
            if general.contains(',') {
                return Err(String::from("Too many parameters"));
            }

            Ok(Class { instance: input[..position].into(), general })
        },
        None => Ok(Class { instance: input.into(), general: DEFAULT_NAME.into() }),
    }
}

/// Convert to hex if possible, else decimal
fn parse_hex_or_decimal(input: &str) -> Option<c_ulong> {
    input
        .strip_prefix("0x")
        .and_then(|value| c_ulong::from_str_radix(value, 16).ok())
        .or_else(|| input.parse().ok())
}

/// Terminal specific cli options which can be passed to new windows via IPC.
#[derive(Serialize, Deserialize, Args, Default, Debug, Clone, PartialEq, Eq)]
pub struct TerminalOptions {
    /// Start the shell in the specified working directory.
    #[clap(long, value_hint = ValueHint::FilePath)]
    pub working_directory: Option<PathBuf>,

    /// Remain open after child process exit.
    #[clap(long)]
    pub hold: bool,

    /// Command and args to execute (must be last argument).
    #[clap(short = 'e', long, allow_hyphen_values = true, multiple_values = true)]
    command: Vec<String>,
}

impl TerminalOptions {
    /// Shell override passed through the CLI.