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
|
//! Missing batteries for standard libraries.
use std::{cmp::Ordering, ops, time::Instant};
mod macros;
pub mod process;
pub mod panic_context;
pub use always_assert::{always, never};
#[inline(always)]
pub fn is_ci() -> bool {
option_env!("CI").is_some()
}
#[must_use]
pub fn timeit(label: &'static str) -> impl Drop {
let start = Instant::now();
defer(move || eprintln!("{}: {:.2?}", label, start.elapsed()))
}
/// Prints backtrace to stderr, useful for debugging.
#[cfg(feature = "backtrace")]
pub fn print_backtrace() {
let bt = backtrace::Backtrace::new();
eprintln!("{:?}", bt);
}
#[cfg(not(feature = "backtrace"))]
pub fn print_backtrace() {
eprintln!(
r#"Enable the backtrace feature.
Uncomment `default = [ "backtrace" ]` in `crates/stdx/Cargo.toml`.
"#
);
}
pub fn to_lower_snake_case(s: &str) -> String {
to_snake_case(s, char::to_ascii_lowercase)
}
pub fn to_upper_snake_case(s: &str) -> String {
to_snake_case(s, char::to_ascii_uppercase)
}
fn to_snake_case<F: Fn(&char) -> char>(s: &str, change_case: F) -> String {
let mut buf = String::with_capacity(s.len());
let mut prev = false;
for c in s.chars() {
// `&& prev` is required to not insert `_` before the first symbol.
if c.is_ascii_uppercase() && prev {
// This check is required to not translate `Weird_Case` into `weird__case`.
if !buf.ends_with('_') {
buf.push('_')
}
}
prev = true;
buf.push(change_case(&c));
}
buf
}
pub fn replace(buf: &mut String, from: char, to: &str) {
if !buf.contains(from) {
return;
}
// FIXME: do this in place.
*buf = buf.replace(from, to)
}
pub fn trim_indent(mut text: &str) -> String {
if text.starts_with('\n') {
text = &text[1..];
}
let indent = text
.lines()
.filter(|it| !it.trim().is_empty())
.map(|it| it.len() - it.trim_start().len())
.min()
.unwrap_or(0);
text.split_inclusive('\n')
.map(
|line| {
if line.len() <= indent {
line.trim_start_matches(' ')
} else {
&line[indent..]
}
},
)
.collect()
}
pub fn equal_range_by<T, F>(slice: &[T], mut key: F) -> ops::Range<usize>
where
F: FnMut(&T) -> Ordering,
{
let start = slice.partition_point(|it| key(it) == Ordering::Less);
let len = slice[start..].partition_point(|it| key(it) == Ordering::Equal);
start..start + len
}
#[must_use]
pub fn defer<F: FnOnce()>(f: F) -> impl Drop {
struct D<F: FnOnce()>(Option<F>);
impl<F: FnOnce()> Drop for D<F> {
fn drop(&mut self) {
if let Some(f) = self.0.take() {
f()
}
}
}
D(Some(f))
}
#[repr(transparent)]
pub struct JodChild(pub std::process::Child);
impl ops::Deref for JodChild {
type Target = std::process::Child;
fn deref(&self) -> &std::process::Child {
&self.0
}
}
impl ops::DerefMut for JodChild {
fn deref_mut(&mut self) -> &mut std::process::Child {
&mut self.0
}
}
impl Drop for JodChild {
fn drop(&mut self) {
let _ = self.0.kill();
let _ = self.0.wait();
}
}
impl JodChild {
pub fn into_inner(self) -> std::process::Child {
// SAFETY: repr transparent
unsafe { std::mem::transmute::<JodChild, std::process::Child>(self) }
}
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn test_trim_indent() {
assert_eq!(trim_indent(""), "");
assert_eq!(
trim_indent(
"
hello
world
"
),
"hello\nworld\n"
);
assert_eq!(
trim_indent(
"
hello
world"
),
"hello\nworld"
);
assert_eq!(trim_indent(" hello\n world\n"), "hello\nworld\n");
assert_eq!(
trim_indent(
"
fn main() {
return 92;
}
"
),
"fn main() {\n return 92;\n}\n"
);
}
}
|
