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use std::{
env,
fmt::{self, Display},
io
};
pub enum Error {
BadLengths,
DuplicateElems(Vec<String>),
IOError(io::Error),
NoEditor,
SpawnFailed(String, io::Error),
}
impl Display for Error {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
let p = env::args().next().unwrap();
match self {
Self::BadLengths => writeln!(f, "{p}: Files have been added or removed during editing"),
Self::DuplicateElems(ds) => ds.iter().try_for_each(
|d| writeln!(f, "{p}: Multiple files named \"{}\" specified", d)
),
Self::IOError(e) => writeln!(f, "{p}: {e}"),
Self::NoEditor => writeln!(f, "{p}: \"EDITOR\" environment variable is not set"),
Self::SpawnFailed(ed, e) => writeln!(f, "{p}: Failed to spawn editor \"{ed}\": {e}")
}
}
}
impl From<io::Error> for Error {
fn from(e: io::Error) -> Self {
Self::IOError(e)
}
}
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