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use crate::PackageId;
use cargo_metadata::Error as MetadataError;
use serde_json;
use std::error;
use std::fmt;
use std::io;
use Error::*;
#[derive(Debug)]
pub enum Error {
#[doc(hidden)]
ConfigIoError(io::Error),
#[doc(hidden)]
ConfigParseError(toml::de::Error),
CommandError(MetadataError),
MetadataParseError(serde_json::Error),
PackageGraphConstructError(String),
UnknownPackageId(PackageId),
PackageGraphInternalError(String),
}
impl fmt::Display for Error {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
match self {
ConfigIoError(err) => write!(f, "Error while reading config file: {}", err),
ConfigParseError(err) => write!(f, "Error while parsing config file: {}", err),
CommandError(err) => write!(f, "Error while executing 'cargo metadata': {}", err),
MetadataParseError(err) => write!(
f,
"Error while parsing 'cargo metadata' JSON output: {}",
err
),
PackageGraphConstructError(msg) => {
write!(f, "Error while computing package graph: {}", msg)
}
UnknownPackageId(id) => write!(f, "Unknown package ID: {}", id),
PackageGraphInternalError(msg) => write!(f, "Internal error in package graph: {}", msg),
}
}
}
impl error::Error for Error {
fn source(&self) -> Option<&(dyn error::Error + 'static)> {
match self {
ConfigIoError(err) => Some(err),
ConfigParseError(err) => Some(err),
MetadataParseError(err) => Some(err),
CommandError(_) => None,
PackageGraphConstructError(_) => None,
UnknownPackageId(_) => None,
PackageGraphInternalError(_) => None,
}
}
}