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use failure::{Backtrace, Context, Fail};
use std::fmt::{self, Debug, Display};
use yansi::{Color, Paint};
/// Kinds of errors which might happen during the generation of an archive
#[derive(Debug, Fail)]
pub enum CompressionErrorKind {
#[fail(display = "Could not open file {}", path)]
OpenFileError { path: String },
#[fail(display = "Could not create temporary file")]
CreateTemporaryFileError,
#[fail(display = "Could not create file {}", path)]
CreateFileError { path: String },
#[fail(display = "Invalid path: directory name terminates in \"..\"")]
InvalidDirectoryName,
#[fail(display = "Invalid path: directory name contains invalid UTF-8 characters")]
InvalidUTF8DirectoryName,
#[fail(display = "Failed to create the TAR archive: {}", message)]
TarBuildingError { message: String },
#[fail(display = "Failed to create the GZIP archive: {}", message)]
GZipBuildingError { message: String },
#[fail(display = "Failed to retrieve TAR content")]
TarContentError,
#[fail(display = "Failed to retrieve GZIP content")]
GZipContentError,
}
/// Prints the full chain of error, up to the root cause.
/// If RUST_BACKTRACE is set to 1, also prints the backtrace for each error
pub fn print_error_chain(err: CompressionError) {
println!(
"{error} {err}",
error = Paint::red("error:").bold(),
err = Paint::white(&err).bold()
);
print_backtrace(&err);
for cause in Fail::iter_causes(&err) {
println!(
"{} {}",
Color::RGB(255, 192, 0).paint("caused by:").to_string(),
cause
);
print_backtrace(cause);
}
}
/// Prints the backtrace of an error
/// RUST_BACKTRACE needs to be set to 1 to display the backtrace
fn print_backtrace(err: &dyn Fail) {
if let Some(backtrace) = err.backtrace() {
let backtrace = backtrace.to_string();
if backtrace != "" {
println!("{}", backtrace);
}
}
}
/// Based on https://boats.gitlab.io/failure/error-errorkind.html
pub struct CompressionError {
inner: Context<CompressionErrorKind>,
}
impl CompressionError {
pub fn new(kind: CompressionErrorKind) -> CompressionError {
CompressionError {
inner: Context::new(kind),
}
}
}
impl Fail for CompressionError {
fn cause(&self) -> Option<&Fail> {
self.inner.cause()
}
fn backtrace(&self) -> Option<&Backtrace> {
self.inner.backtrace()
}
}
impl Display for CompressionError {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
Display::fmt(&self.inner, f)
}
}
impl Debug for CompressionError {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
Debug::fmt(&self.inner, f)
}
}
impl From<Context<CompressionErrorKind>> for CompressionError {
fn from(inner: Context<CompressionErrorKind>) -> CompressionError {
CompressionError { inner }
}
}
impl From<CompressionErrorKind> for CompressionError {
fn from(kind: CompressionErrorKind) -> CompressionError {
CompressionError {
inner: Context::new(kind),
}
}
}
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