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
|
use crate::chain::Chain;
use crate::error::ErrorImpl;
use crate::ptr::Ref;
use core::fmt::{self, Debug, Write};
impl ErrorImpl {
pub(crate) unsafe fn display(this: Ref<Self>, f: &mut fmt::Formatter) -> fmt::Result {
write!(f, "{}", Self::error(this))?;
if f.alternate() {
for cause in Self::chain(this).skip(1) {
write!(f, ": {}", cause)?;
}
}
Ok(())
}
pub(crate) unsafe fn debug(this: Ref<Self>, f: &mut fmt::Formatter) -> fmt::Result {
let error = Self::error(this);
if f.alternate() {
return Debug::fmt(error, f);
}
write!(f, "{}", error)?;
if let Some(cause) = error.source() {
write!(f, "\n\nCaused by:")?;
let multiple = cause.source().is_some();
for (n, error) in Chain::new(cause).enumerate() {
writeln!(f)?;
let mut indented = Indented {
inner: f,
number: if multiple { Some(n) } else { None },
started: false,
};
write!(indented, "{}", error)?;
}
}
#[cfg(any(backtrace, feature = "backtrace"))]
{
use crate::backtrace::BacktraceStatus;
let backtrace = Self::backtrace(this);
if let BacktraceStatus::Captured = backtrace.status() {
let mut backtrace = backtrace.to_string();
write!(f, "\n\n")?;
if backtrace.starts_with("stack backtrace:") {
// Capitalize to match "Caused by:"
backtrace.replace_range(0..1, "S");
} else {
// "stack backtrace:" prefix was removed in
// https://github.com/rust-lang/backtrace-rs/pull/286
writeln!(f, "Stack backtrace:")?;
}
backtrace.truncate(backtrace.trim_end().len());
write!(f, "{}", backtrace)?;
}
}
Ok(())
}
}
struct Indented<'a, D> {
inner: &'a mut D,
number: Option<usize>,
started: bool,
}
impl<T> Write for Indented<'_, T>
where
T: Write,
{
fn write_str(&mut self, s: &str) -> fmt::Result {
for (i, line) in s.split('\n').enumerate() {
if !self.started {
self.started = true;
match self.number {
Some(number) => write!(self.inner, "{: >5}: ", number)?,
None => self.inner.write_str(" ")?,
}
} else if i > 0 {
self.inner.write_char('\n')?;
if self.number.is_some() {
self.inner.write_str(" ")?;
} else {
self.inner.write_str(" ")?;
}
}
self.inner.write_str(line)?;
}
Ok(())
}
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn one_digit() {
let input = "verify\nthis";
let expected = " 2: verify\n this";
let mut output = String::new();
Indented {
inner: &mut output,
number: Some(2),
started: false,
}
.write_str(input)
.unwrap();
assert_eq!(expected, output);
}
#[test]
fn two_digits() {
let input = "verify\nthis";
let expected = " 12: verify\n this";
let mut output = String::new();
Indented {
inner: &mut output,
number: Some(12),
started: false,
}
.write_str(input)
.unwrap();
assert_eq!(expected, output);
}
#[test]
fn no_digits() {
let input = "verify\nthis";
let expected = " verify\n this";
let mut output = String::new();
Indented {
inner: &mut output,
number: None,
started: false,
}
.write_str(input)
.unwrap();
assert_eq!(expected, output);
}
}
|
