cargo-msrv 0.3.0

Assists with finding your minimum supported Rust version (MSRV)
Documentation 
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

use crate::command::command;
use crate::config::CmdMatches;
use crate::errors::{CargoMSRVError, TResult};
use crate::ui::Printer;
use console::style;
use rust_releases::semver;
use std::path::Path;

pub enum CheckStatus {
    Success {
        // toolchain specifier
        toolchain: String,
        // checked Rust version
        version: semver::Version,
    },
    Failure {
        // toolchain specifier
        toolchain: String,
        // checked Rust version
        version: semver::Version,
    },
}

pub fn check_toolchain<'a>(
    version: &'a semver::Version,
    config: &'a CmdMatches,
    ui: &'a Printer,
) -> TResult<CheckStatus> {
    let toolchain_specifier = as_toolchain_specifier(version, config.target());

    download_if_required(version, &toolchain_specifier, ui)?;
    try_building(
        version,
        &toolchain_specifier,
        config.seek_path(),
        config.check_command(),
        ui,
    )
}

pub fn as_toolchain_specifier(version: &semver::Version, target: &str) -> String {
    format!("{}-{}", version, target)
}

fn download_if_required(
    version: &semver::Version,
    toolchain_specifier: &str,
    ui: &Printer,
) -> TResult<()> {
    let toolchain = toolchain_specifier.to_owned();
    ui.show_progress("Installing", version);

    let status = command(&["install", "--profile", "minimal", &toolchain], None)
        .and_then(|mut c| c.wait().map_err(CargoMSRVError::Io))?;

    if !status.success() {
        return Err(CargoMSRVError::RustupInstallFailed(
            toolchain_specifier.to_string(),
        ));
    }

    Ok(())
}

fn try_building(
    version: &semver::Version,
    toolchain_specifier: &str,
    dir: Option<&Path>,
    check: &[&str],
    ui: &Printer,
) -> TResult<CheckStatus> {
    let mut cmd: Vec<&str> = vec!["run", toolchain_specifier];
    cmd.extend_from_slice(check);

    let mut child = command(&cmd, dir).map_err(|_| CargoMSRVError::UnableToRunCheck)?;
    ui.show_progress("Checking", version);

    let status = child.wait()?;

    if !status.success() {
        ui.complete_step(
            format!(
                "{} red light for {}",
                style("Done").green().bold(),
                style(version).cyan()
            )
            .as_str(),
        );

        Ok(CheckStatus::Failure {
            toolchain: toolchain_specifier.to_string(),
            version: version.clone(),
        })
    } else {
        ui.complete_step(
            format!(
                "{} green light for {}",
                style("Done").green().bold(),
                style(version).cyan()
            )
            .as_str(),
        );
        Ok(CheckStatus::Success {
            toolchain: toolchain_specifier.to_string(),
            version: version.clone(),
        })
    }
}