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
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
#![allow(deprecated)]
use error_chain::error_chain;
use reqwest::StatusCode;
use std::io::Write;
use std::result::Result as StdResult;
use std::{convert, ffi, io, num, str};
use zip::result::ZipError;
cfg_if::cfg_if! {
if #[cfg(feature = "toml")] {
pub type ReadError = toml::de::Error;
pub type WriteError = toml::ser::Error;
} else {
use std::fmt::{self, Formatter, Display};
use std::error;
#[derive(Debug)]
pub enum ReadError {}
impl Display for ReadError {
fn fmt(&self, _fmt: &mut Formatter<'_>) -> fmt::Result {
Ok(())
}
}
impl error::Error for ReadError { }
#[derive(Debug)]
pub enum WriteError {}
impl Display for WriteError {
fn fmt(&self, _fmt: &mut Formatter<'_>) -> fmt::Result {
Ok(())
}
}
impl error::Error for WriteError { }
}
}
error_chain! {
types {
Error, ErrorKind, ResultExt, Result;
}
foreign_links {
AppDirs(app_dirs::AppDirsError);
Io(io::Error);
Nul(ffi::NulError);
ParseInt(num::ParseIntError);
Persist(tempfile::PersistError);
Reqwest(reqwest::Error);
ConfigRead(ReadError);
ConfigWrite(WriteError);
Utf8(str::Utf8Error);
Xdv(tectonic_xdv::XdvError);
Zip(ZipError);
}
errors {
BadLength(expected: usize, observed: usize) {
description("the item is not the expected length")
display("expected length {}; found {}", expected, observed)
}
NotSeekable {
description("this stream is not seekable")
display("this stream is not seekable")
}
NotSizeable {
description("the size of this stream cannot be determined")
display("the size of this stream cannot be determined")
}
PathForbidden(path: String) {
description("access to this file path is forbidden")
display("access to the path {} is forbidden", path)
}
EngineError(engine: &'static str) {
description("some engine had an unrecoverable error")
display("the {} engine had an unrecoverable error", engine)
}
UnexpectedHttpResponse(url: String, status: StatusCode) {
description("unexpected HTTP response to URL")
display("unexpected HTTP response to URL {}: {}", url, status)
}
}
}
#[macro_export]
macro_rules! errmsg {
($( $fmt_args:expr ),*) => {
$crate::errors::ErrorKind::Msg(format!($( $fmt_args ),*)).into()
};
}
#[macro_export]
macro_rules! ctry {
($op:expr ; $( $chain_fmt_args:expr ),*) => {{
use $crate::errors::ResultExt;
$op.chain_err(|| format!($( $chain_fmt_args ),*))?
}}
}
impl convert::From<Error> for io::Error {
fn from(err: Error) -> io::Error {
io::Error::new(io::ErrorKind::Other, format!("{}", err))
}
}
impl Error {
pub fn dump_uncolorized(&self) {
let mut prefix = "error:";
let mut s = io::stderr();
for item in self.iter() {
writeln!(s, "{} {}", prefix, item).expect("write to stderr failed");
prefix = "caused by:";
}
if let Some(backtrace) = self.backtrace() {
writeln!(s, "debugging: backtrace follows:").expect("write to stderr failed");
writeln!(s, "{:?}", backtrace).expect("write to stderr failed");
}
}
}
pub trait DefinitelySame {
fn definitely_same(&self, other: &Self) -> bool;
}
impl DefinitelySame for ErrorKind {
fn definitely_same(&self, other: &Self) -> bool {
if let ErrorKind::Msg(ref s) = *self {
return if let ErrorKind::Msg(ref o) = *other {
s == o
} else {
false
};
}
false
}
}
impl DefinitelySame for Error {
fn definitely_same(&self, other: &Self) -> bool {
self.kind().definitely_same(other.kind())
}
}
impl<T: DefinitelySame, E: DefinitelySame> DefinitelySame for StdResult<T, E> {
fn definitely_same(&self, other: &Self) -> bool {
match *self {
Ok(ref st) => {
if let Ok(ref ot) = *other {
st.definitely_same(ot)
} else {
false
}
}
Err(ref se) => {
if let Err(ref oe) = *other {
se.definitely_same(oe)
} else {
false
}
}
}
}
}