cargo-wasi-src 0.1.15

Subcommand for Cargo to easily build code for `wasm32-wasi`
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
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128

use crate::Cache;
use anyhow::Result;
use std::path::PathBuf;
use termcolor::{Color, ColorChoice, ColorSpec, StandardStream, WriteColor};

pub struct Config {
    cache: Option<Cache>,
    verbose: bool,
    choice: ColorChoice,
}

impl Config {
    pub fn new() -> Config {
        Config {
            cache: None,
            verbose: false,
            choice: if atty::is(atty::Stream::Stderr) {
                ColorChoice::Auto
            } else {
                ColorChoice::Never
            },
        }
    }

    pub fn load_cache(&mut self) -> Result<()> {
        assert!(!self.cache.is_some());
        self.cache = Some(Cache::new()?);
        Ok(())
    }

    pub fn cache(&self) -> &Cache {
        self.cache.as_ref().expect("cache not loaded yet")
    }

    pub fn is_verbose(&self) -> bool {
        self.verbose
    }

    pub fn verbose(&self, f: impl FnOnce()) {
        if self.verbose {
            f();
        }
    }

    pub fn set_verbose(&mut self, verbose: bool) {
        self.verbose = verbose;
    }

    pub fn status(&self, name: &str, rest: &str) {
        let mut shell = StandardStream::stderr(self.choice);
        drop(shell.set_color(ColorSpec::new().set_fg(Some(Color::Green)).set_bold(true)));
        eprint!("{:>12}", name);
        drop(shell.reset());
        eprintln!(" {}", rest);
    }

    pub fn print_error(&self, err: &anyhow::Error) {
        if let Some(code) = crate::utils::normal_process_exit_code(err) {
            std::process::exit(code);
        }
        let mut shell = StandardStream::stderr(self.choice);
        drop(shell.set_color(ColorSpec::new().set_fg(Some(Color::Red)).set_bold(true)));
        eprint!("error");
        drop(shell.reset());
        eprintln!(": {}", err);
        for cause in err.chain().skip(1) {
            eprintln!("");
            drop(shell.set_color(ColorSpec::new().set_bold(true)));
            eprint!("Caused by");
            drop(shell.reset());
            eprintln!(":");
            eprintln!("    {}", cause.to_string().replace("\n", "\n    "));
        }
    }

    pub fn info(&self, msg: &str) {
        let mut shell = StandardStream::stderr(self.choice);
        drop(shell.set_color(ColorSpec::new().set_fg(Some(Color::Cyan)).set_bold(true)));
        eprint!("info");
        drop(shell.reset());
        eprintln!(": {}", msg);
    }

    /// Returns the path to execute a tool, and the cache path where it should
    /// be downloaded to if unavailable.
    ///
    /// These are not necessarily the same path (e.g. if using overrides)!
    ///
    /// To override the path used for a tool, set an env var of the tool's name
    /// in uppercase with hyphens replaced with underscores to the desired
    /// path. For example, `WASM_BINDGEN=path/to/wasm-bindgen` to override the
    /// `wasm-bindgen` used, or `WASM_OPT=path/to/wasm-opt` for `wasm-opt`.  or
    /// the `cache` as the fallback.
    fn get_tool(&self, tool: &str, version: Option<&str>) -> (PathBuf, PathBuf) {
        let mut cache_path = self.cache().root().join(tool);
        if let Some(v) = version {
            cache_path.push(v);
            cache_path.push(tool)
        }
        cache_path.set_extension(std::env::consts::EXE_EXTENSION);

        if let Some(s) = std::env::var_os(tool.to_uppercase().replace("-", "_")) {
            (s.into(), cache_path)
        } else {
            (cache_path.clone(), cache_path)
        }
    }

    /// Get the path to our `wasm-bindgen` tool for the given version, and the
    /// cache path where it should be downloaded to if missing.
    ///
    /// These are not necessarily the same path (e.g. if using overrides)!
    ///
    /// Overridable via setting the `WASM_BINDGEN=path/to/wasm-bindgen` env var.
    pub fn get_wasm_bindgen(&self, version: &str) -> (PathBuf, PathBuf) {
        self.get_tool("wasm-bindgen", Some(version))
    }

    /// Get the path to our `wasm-opt`, and the cache path where it should be
    /// downloaded to if missing.
    ///
    /// These are not necessarily the same path (e.g. if using overrides)!
    ///
    /// Overridable via setting the `WASM_OPT=path/to/wasm-opt` env var.
    pub fn get_wasm_opt(&self) -> (PathBuf, PathBuf) {
        self.get_tool("wasm-opt", None)
    }
}