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 std::fmt::Display;
use std::path::Path;
use std::str::FromStr;
use clap::builder::PossibleValue;
use clap::ValueEnum;
use crate::shells;
use crate::Generator;
/// Shell with auto-generated completion script available.
#[derive(Clone, Copy, Debug, Eq, Hash, PartialEq)]
#[non_exhaustive]
pub enum Shell {
/// Bourne Again SHell (bash)
Bash,
/// Elvish shell
Elvish,
/// Friendly Interactive SHell (fish)
Fish,
/// PowerShell
PowerShell,
/// Z SHell (zsh)
Zsh,
}
impl Display for Shell {
fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
self.to_possible_value()
.expect("no values are skipped")
.get_name()
.fmt(f)
}
}
impl FromStr for Shell {
type Err = String;
fn from_str(s: &str) -> Result<Self, Self::Err> {
for variant in Self::value_variants() {
if variant.to_possible_value().unwrap().matches(s, false) {
return Ok(*variant);
}
}
Err(format!("invalid variant: {s}"))
}
}
// Hand-rolled so it can work even when `derive` feature is disabled
impl ValueEnum for Shell {
fn value_variants<'a>() -> &'a [Self] {
&[
Shell::Bash,
Shell::Elvish,
Shell::Fish,
Shell::PowerShell,
Shell::Zsh,
]
}
fn to_possible_value<'a>(&self) -> Option<PossibleValue> {
Some(match self {
Shell::Bash => PossibleValue::new("bash"),
Shell::Elvish => PossibleValue::new("elvish"),
Shell::Fish => PossibleValue::new("fish"),
Shell::PowerShell => PossibleValue::new("powershell"),
Shell::Zsh => PossibleValue::new("zsh"),
})
}
}
impl Generator for Shell {
fn file_name(&self, name: &str) -> String {
match self {
Shell::Bash => shells::Bash.file_name(name),
Shell::Elvish => shells::Elvish.file_name(name),
Shell::Fish => shells::Fish.file_name(name),
Shell::PowerShell => shells::PowerShell.file_name(name),
Shell::Zsh => shells::Zsh.file_name(name),
}
}
fn generate(&self, cmd: &clap::Command, buf: &mut dyn std::io::Write) {
match self {
Shell::Bash => shells::Bash.generate(cmd, buf),
Shell::Elvish => shells::Elvish.generate(cmd, buf),
Shell::Fish => shells::Fish.generate(cmd, buf),
Shell::PowerShell => shells::PowerShell.generate(cmd, buf),
Shell::Zsh => shells::Zsh.generate(cmd, buf),
}
}
}
impl Shell {
/// Parse a shell from a path to the executable for the shell
///
/// # Examples
///
/// ```
/// use clap_complete::shells::Shell;
///
/// assert_eq!(Shell::from_shell_path("/bin/bash"), Some(Shell::Bash));
/// assert_eq!(Shell::from_shell_path("/usr/bin/zsh"), Some(Shell::Zsh));
/// assert_eq!(Shell::from_shell_path("/opt/my_custom_shell"), None);
/// ```
pub fn from_shell_path<P: AsRef<Path>>(path: P) -> Option<Shell> {
parse_shell_from_path(path.as_ref())
}
/// Determine the user's current shell from the environment
///
/// This will read the SHELL environment variable and try to determine which shell is in use
/// from that.
///
/// If SHELL is not set, then on windows, it will default to powershell, and on
/// other OSes it will return `None`.
///
/// If SHELL is set, but contains a value that doesn't correspond to one of the supported shell
/// types, then return `None`.
///
/// # Example:
///
/// ```no_run
/// # use clap::Command;
/// use clap_complete::{generate, shells::Shell};
/// # fn build_cli() -> Command {
/// # Command::new("compl")
/// # }
/// let mut cmd = build_cli();
/// generate(Shell::from_env().unwrap_or(Shell::Bash), &mut cmd, "myapp", &mut std::io::stdout());
/// ```
pub fn from_env() -> Option<Shell> {
if let Some(env_shell) = std::env::var_os("SHELL") {
Shell::from_shell_path(env_shell)
} else if cfg!(windows) {
Some(Shell::PowerShell)
} else {
None
}
}
}
// use a separate function to avoid having to monomorphize the entire function due
// to from_shell_path being generic
fn parse_shell_from_path(path: &Path) -> Option<Shell> {
let name = path.file_stem()?.to_str()?;
match name {
"bash" => Some(Shell::Bash),
"zsh" => Some(Shell::Zsh),
"fish" => Some(Shell::Fish),
"elvish" => Some(Shell::Elvish),
"powershell" | "powershell_ise" => Some(Shell::PowerShell),
_ => None,
}
}
|
