uu_seq 0.1.0

seq ~ (uutils) display a sequence of numbers
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// This file is part of the uutils coreutils package.
//
// For the full copyright and license information, please view the LICENSE
// file that was distributed with this source code.
// spell-checker:ignore numberparse
//! Errors returned by seq.
use crate::numberparse::ParseNumberError;
use thiserror::Error;
use uucore::display::Quotable;
use uucore::error::UError;

#[derive(Debug, Error)]
pub enum SeqError {
    /// An error parsing the input arguments.
    ///
    /// The parameters are the [`String`] argument as read from the
    /// command line and the underlying parsing error itself.
    #[error("invalid {} argument: {}", parse_error_type(.1), .0.quote())]
    ParseError(String, ParseNumberError),

    /// The increment argument was zero, which is not allowed.
    ///
    /// The parameter is the increment argument as a [`String`] as read
    /// from the command line.
    #[error("invalid Zero increment value: {}", .0.quote())]
    ZeroIncrement(String),

    /// No arguments were passed to this function, 1 or more is required
    #[error("missing operand")]
    NoArguments,

    /// Both a format and equal width where passed to seq
    #[error("format string may not be specified when printing equal width strings")]
    FormatAndEqualWidth,
}

fn parse_error_type(e: &ParseNumberError) -> &'static str {
    match e {
        ParseNumberError::Float => "floating point",
        ParseNumberError::Nan => "'not-a-number'",
    }
}

impl UError for SeqError {
    /// Always return 1.
    fn code(&self) -> i32 {
        1
    }

    fn usage(&self) -> bool {
        true
    }
}