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
|
// Copyright 2016 Joe Wilm, The Alacritty Project Contributors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
use std::ffi::OsStr;
use std::process::Command;
use std::{cmp, io};
#[cfg(not(windows))]
use std::os::unix::process::CommandExt;
#[cfg(windows)]
use std::os::windows::process::CommandExt;
#[cfg(windows)]
use std::process::Stdio;
#[cfg(windows)]
use winapi::um::winbase::{CREATE_NEW_PROCESS_GROUP, CREATE_NO_WINDOW};
/// Threading utilities
pub mod thread {
/// Like `thread::spawn`, but with a `name` argument
pub fn spawn_named<F, T, S>(name: S, f: F) -> ::std::thread::JoinHandle<T>
where
F: FnOnce() -> T,
F: Send + 'static,
T: Send + 'static,
S: Into<String>,
{
::std::thread::Builder::new().name(name.into()).spawn(f).expect("thread spawn works")
}
pub use std::thread::*;
}
pub fn limit<T: Ord>(value: T, min: T, max: T) -> T {
cmp::min(cmp::max(value, min), max)
}
/// Utilities for writing to the
pub mod fmt {
use std::fmt;
macro_rules! define_colors {
($($(#[$attrs:meta])* pub struct $s:ident => $color:expr;)*) => {
$(
$(#[$attrs])*
pub struct $s<T>(pub T);
impl<T: fmt::Display> fmt::Display for $s<T> {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
write!(f, concat!("\x1b[", $color, "m{}\x1b[0m"), self.0)
}
}
impl<T: fmt::Debug> fmt::Debug for $s<T> {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
write!(f, concat!("\x1b[", $color, "m{:?}\x1b[0m"), self.0)
}
}
)*
}
}
define_colors! {
/// Write a `Display` or `Debug` escaped with Red
pub struct Red => "31";
/// Write a `Display` or `Debug` escaped with Green
pub struct Green => "32";
/// Write a `Display` or `Debug` escaped with Yellow
pub struct Yellow => "33";
}
}
#[cfg(not(windows))]
pub fn start_daemon<I, S>(program: &str, args: I) -> io::Result<()>
where
I: IntoIterator<Item = S>,
S: AsRef<OsStr>,
{
Command::new(program)
.args(args)
.before_exec(|| unsafe {
#[allow(deprecated)]
libc::daemon(1, 0);
Ok(())
})
.spawn()?
.wait()
.map(|_| ())
}
#[cfg(windows)]
pub fn start_daemon<I, S>(program: &str, args: I) -> io::Result<()>
where
I: IntoIterator<Item = S>,
S: AsRef<OsStr>,
{
// Setting all the I/O handles to null and setting the
// CREATE_NEW_PROCESS_GROUP and CREATE_NO_WINDOW has the effect
// that console applications will run without opening a new
// console window.
Command::new(program)
.args(args)
.stdin(Stdio::null())
.stdout(Stdio::null())
.stderr(Stdio::null())
.creation_flags(CREATE_NEW_PROCESS_GROUP | CREATE_NO_WINDOW)
.spawn()
.map(|_| ())
}
#[cfg(test)]
mod tests {
use super::limit;
#[test]
fn limit_works() {
assert_eq!(10, limit(10, 0, 100));
assert_eq!(10, limit(5, 10, 100));
assert_eq!(100, limit(1000, 10, 100));
}
}
|
