1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
|
use std::{
env,
fmt::{self, Display},
io,
string
};
pub enum Error {
BadArgs,
BadLengths,
DupInputElems(Vec<String>),
DupOutputElems(Vec<String>),
IOError(io::Error),
Nop,
UTF8Error(string::FromUtf8Error),
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::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}")
}
}
}
impl From<io::Error> for Error {
fn from(e: io::Error) -> Self {
Self::IOError(e)
}
}
impl From<string::FromUtf8Error> for Error {
fn from(e: string::FromUtf8Error) -> Self {
Self::UTF8Error(e)
}
}
|
