1
 2
 3
 4
 5
 6
 7
 8
 9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78

/*
 * error.rs is part of slaps.
 * Copyright (C) 2020 rd <slaps@megane.space>
 * License: WTFPL
 */
pub use crate::clap::{Error as ClapError, ErrorKind};
pub use crate::readline::Error as ReadlineError;
pub use crate::shlex::MismatchedQuotes;
use std::{error, fmt};

/// Variant of all sub-types of errors returned by the library.
#[allow(clippy::pub_enum_variant_names)]
#[derive(Debug)]
pub enum Error {
    /// Error while parsing the input using clap.
    ClapError(ClapError),
    /// Error while reading a line from standard input.
    ReadlineError(ReadlineError),
    /// Mismatched quotes while parsing the input.
    ///
    /// Contains the position of the first mismatched quote within the original input.
    MismatchedQuotes(usize),
    /// Error returned by a command handler.
    ExecutionError(ExecutionError),
}

impl fmt::Display for Error {
    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
        write!(f, "{}", self)
    }
}

impl error::Error for Error {}

impl From<ClapError> for Error {
    fn from(e: ClapError) -> Self {
        Error::ClapError(e)
    }
}

impl From<ReadlineError> for Error {
    fn from(e: ReadlineError) -> Self {
        Error::ReadlineError(e)
    }
}

impl From<MismatchedQuotes> for Error {
    fn from(e: MismatchedQuotes) -> Self {
        Error::MismatchedQuotes(e.0)
    }
}

impl From<ExecutionError> for Error {
    fn from(e: ExecutionError) -> Self {
        Error::ExecutionError(e)
    }
}

/// Error variant for command handlers.
#[derive(Debug)]
#[allow(clippy::module_name_repetitions)]
pub enum ExecutionError {
    /// Program should exit due to a fatal error encountered while executing the command.
    FatalExit(Box<dyn error::Error>),
    /// Program should exit gracefully.
    GracefulExit,
}

impl fmt::Display for ExecutionError {
    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
        match self {
            ExecutionError::FatalExit(e) => write!(f, "{}", e),
            ExecutionError::GracefulExit => write!(f, "Success"),
        }
    }
}

impl error::Error for ExecutionError {}