blob: 36228993d0a89aee9f97aff7e3600ec34534ed25 (
plain)
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
|
use ansi_term::Color;
use std::env;
use super::{Context, Module};
// IN_NIX_SHELL should be "pure" or "impure" but lorri uses "1" for "impure"
// https://github.com/target/lorri/issues/140
/// Creates a module showing if inside a nix-shell
///
/// The module will use the `$IN_NIX_SHELL` and `$name` environment variable to
/// determine if it's inside a nix-shell and the name of it.
///
/// The following options are availables:
/// - use_name (bool) // print the name of the nix-shell
/// - impure_msg (string) // change the impure msg
/// - pure_msg (string) // change the pure msg
///
/// Will display the following:
/// - name (pure) // use_name == true in a pure nix-shell
/// - name (impure) // use_name == true in an impure nix-shell
/// - pure // use_name == false in a pure nix-shell
/// - impure // use_name == false in an impure nix-shell
pub fn module<'a>(context: &'a Context) -> Option<Module<'a>> {
let mut module = context.new_module("nix_shell");
env::var("IN_NIX_SHELL")
.ok()
.and_then(|shell_type| {
if shell_type == "1" || shell_type == "impure" {
Some(module.config_value_str("impure_msg").unwrap_or("impure"))
} else if shell_type == "pure" {
Some(module.config_value_str("pure_msg").unwrap_or("pure"))
} else {
None
}
})
.map(|shell_type| {
if module.config_value_bool("use_name").unwrap_or(false) {
match env::var("name").ok() {
Some(name) => format!("{} ({})", name, shell_type),
None => shell_type.to_string(),
}
} else {
shell_type.to_string()
}
})
.map(|segment| {
let module_style = module
.config_value_style("style")
.unwrap_or_else(|| Color::Red.bold());
module.set_style(module_style);
module.new_segment("nix_shell", &segment);
module
})
}
|
