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|
use std::{
env,
fmt::{self, Display},
io,
str,
};
pub enum Error {
BadArgs,
BadLengths,
DupInputElems(Vec<String>),
DupOutputElems(Vec<String>),
IOError(io::Error),
Nop,
UTF8Error(std::str::Utf8Error),
SpawnFailed(String, io::Error),
BadDecoding(String),
}
impl Display for Error {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
let p = env::args().next().unwrap();
match self {
Self::BadArgs => writeln!(f, "Usage: {p} [-0ei] [--] utility [argument ...]"),
Self::BadLengths => writeln!(f, "{p}: Files have been added or removed during editing"),
Self::DupInputElems(ds) => ds.iter().try_for_each(
|d| writeln!(f, "{p}: Multiple input files named \"{}\" specified", d)
),
Self::DupOutputElems(ds) => ds.iter().try_for_each(
|d| writeln!(f, "{p}: Multiple output files named \"{}\" specified", d)
),
Self::IOError(e) => writeln!(f, "{p}: {e}"),
Self::Nop => Ok(()),
Self::UTF8Error(e) => writeln!(f, "{p}: {e}"),
Self::SpawnFailed(ed, e) => writeln!(f, "{p}: Failed to spawn editor \"{ed}\": {e}"),
Self::BadDecoding(s) => writeln!(f, "{p}: Decoding the text {s:?} failed!"),
}
}
}
impl From<io::Error> for Error {
fn from(e: io::Error) -> Self {
Self::IOError(e)
}
}
impl From<str::Utf8Error> for Error {
fn from(e: str::Utf8Error) -> Self {
Self::UTF8Error(e)
}
}
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