Enum Code 

#[repr(i32)]
pub enum Code {
    OK = 0,
    NotOK = 1,
    UsageError = 80,
    UnknownSubcommand = 81,
    RequirementNotMet = 82,
    Forbidden = 83,
    MovedPermanently = 84,
    InternalError = 100,
    Unavailable = 101,
}

The exit code that is passed to the system call exit when the program terminates. Conventionally, the value zero indicates success and all other values (1-255) indicate failure.

Variants

OK = 0

Indicates that the program exited successfully.

NotOK = 1

Indicates that the program exited unsuccessfully but gives no extra context as to what the failure was.

UsageError = 80

UsageError indicates that the program exited unsuccessfully because it was was used incorrectly.

Examples: a required argument was omitted or an invalid value was supplied for a flag.

UnknownSubcommand = 81

Indicates that the program exited unsuccessfully because an unrecognized subcommand was invoked.

This is intended for CLI multi-tools. When you run a command that doesn’t exist from the shell, the shell exits 127. This is distinct from that value in that the command itself exists but the subcommand does not (e.g. git nope could exit 81).

RequirementNotMet = 82

Indicates that the program exited unsuccessfully because a precondition wasn’t satisfied.

Examples: the user must be on a VPN before using the program or have a minimum version of some other software installed.

Forbidden = 83

Indicates that the program exited unsuccessfully because the user isn’t authorized to perform the requested action.

MovedPermanently = 84

Indicates that the program exited unsuccessfully because it has been migrated to a new location.

InternalError = 100

Indicates that the program exited unsuccessfully because of a problem in its own code.

Used instead of 1 when the problem is known to be with the program’s code or dependencies.

Unavailable = 101

Indicates that the program exited unsuccessfully because a service it depends on was not available.

Examples: A local daemon or remote service did not respond, a connection was closed unexpectedly, an HTTP service responded with 503.

Trait Implementations

impl Clone for Code

fn clone(&self) -> Code

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for Code

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl From<Code> for i32

fn from(value: Code) -> Self

Converts to this type from the input type.

impl FromPrimitive for Code

fn from_i64(n: i64) -> Option<Self>

Converts an i64 to return an optional value of this type. If the value cannot be represented by this type, then None is returned.

fn from_u64(n: u64) -> Option<Self>

Converts an u64 to return an optional value of this type. If the value cannot be represented by this type, then None is returned.

fn from_isize(n: isize) -> Option<Self>

Converts an isize to return an optional value of this type. If the value cannot be represented by this type, then None is returned.

fn from_i8(n: i8) -> Option<Self>

Converts an i8 to return an optional value of this type. If the value cannot be represented by this type, then None is returned.

fn from_i16(n: i16) -> Option<Self>

Converts an i16 to return an optional value of this type. If the value cannot be represented by this type, then None is returned.

fn from_i32(n: i32) -> Option<Self>

Converts an i32 to return an optional value of this type. If the value cannot be represented by this type, then None is returned.

fn from_i128(n: i128) -> Option<Self>

Converts an i128 to return an optional value of this type. If the value cannot be represented by this type, then None is returned.

fn from_usize(n: usize) -> Option<Self>

Converts a usize to return an optional value of this type. If the value cannot be represented by this type, then None is returned.

fn from_u8(n: u8) -> Option<Self>

Converts an u8 to return an optional value of this type. If the value cannot be represented by this type, then None is returned.

fn from_u16(n: u16) -> Option<Self>

Converts an u16 to return an optional value of this type. If the value cannot be represented by this type, then None is returned.

fn from_u32(n: u32) -> Option<Self>

Converts an u32 to return an optional value of this type. If the value cannot be represented by this type, then None is returned.

fn from_u128(n: u128) -> Option<Self>

Converts an u128 to return an optional value of this type. If the value cannot be represented by this type, then None is returned.

fn from_f32(n: f32) -> Option<Self>

Converts a f32 to return an optional value of this type. If the value cannot be represented by this type, then None is returned.

fn from_f64(n: f64) -> Option<Self>

Converts a f64 to return an optional value of this type. If the value cannot be represented by this type, then None is returned.

impl PartialEq for Code

fn eq(&self, other: &Code) -> bool

Tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl ToPrimitive for Code

fn to_i64(&self) -> Option<i64>

Converts the value of self to an i64. If the value cannot be represented by an i64, then None is returned.

fn to_u64(&self) -> Option<u64>

Converts the value of self to a u64. If the value cannot be represented by a u64, then None is returned.

fn to_isize(&self) -> Option<isize>

Converts the value of self to an isize. If the value cannot be represented by an isize, then None is returned.

fn to_i8(&self) -> Option<i8>

Converts the value of self to an i8. If the value cannot be represented by an i8, then None is returned.

fn to_i16(&self) -> Option<i16>

Converts the value of self to an i16. If the value cannot be represented by an i16, then None is returned.

fn to_i32(&self) -> Option<i32>

Converts the value of self to an i32. If the value cannot be represented by an i32, then None is returned.

fn to_i128(&self) -> Option<i128>

Converts the value of self to an i128. If the value cannot be represented by an i128 (i64 under the default implementation), then None is returned.

fn to_usize(&self) -> Option<usize>

Converts the value of self to a usize. If the value cannot be represented by a usize, then None is returned.

fn to_u8(&self) -> Option<u8>

Converts the value of self to a u8. If the value cannot be represented by a u8, then None is returned.

fn to_u16(&self) -> Option<u16>

Converts the value of self to a u16. If the value cannot be represented by a u16, then None is returned.

fn to_u32(&self) -> Option<u32>

Converts the value of self to a u32. If the value cannot be represented by a u32, then None is returned.

fn to_u128(&self) -> Option<u128>

Converts the value of self to a u128. If the value cannot be represented by a u128 (u64 under the default implementation), then None is returned.

fn to_f32(&self) -> Option<f32>

Converts the value of self to an f32. Overflows may map to positive or negative inifinity, otherwise None is returned if the value cannot be represented by an f32.

fn to_f64(&self) -> Option<f64>

Converts the value of self to an f64. Overflows may map to positive or negative inifinity, otherwise None is returned if the value cannot be represented by an f64.

impl TryFrom<i32> for Code

type Error = Error

The type returned in the event of a conversion error.

fn try_from(value: i32) -> Result<Self, Self::Error>

Performs the conversion.

impl Copy for Code

impl StructuralPartialEq for Code