cnf-lib 0.6.0

Distribution-agnostic 'command not found'-handler
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

// SPDX-License-Identifier: GPL-3.0-or-later
// SPDX-FileCopyrightText: (C) 2023 Andreas Hartmann <hartan@7x.de>
// This file is part of cnf-lib, available at <https://gitlab.com/hartang/rust/cnf>

//! # Current Working Directory Provider
//!
//! Searches for commands matching the input in the current working directory. This provider runs
//! only in the current execution environment.
use crate::provider::CnfError;
use crate::provider::prelude::*;

use is_executable::is_executable;
use tokio::fs;

/// Provider for files in the current working directory.
#[derive(Debug, PartialEq)]
pub struct Cwd {
    path: std::path::PathBuf,
}

impl Cwd {
    /// Create a new provider for the current working directory.
    pub fn new() -> Result<Self, CnfError> {
        Ok(Cwd {
            path: std::env::current_dir().context("cannot create 'cwd' provider")?,
        })
    }

    /// Create a new provider for the given directory.
    pub fn with_path(path: std::path::PathBuf) -> Self {
        Cwd { path }
    }
}

impl fmt::Display for Cwd {
    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
        write!(f, "cwd")
    }
}

#[async_trait]
impl IsProvider for Cwd {
    async fn search_internal(
        &self,
        command: &str,
        _target_env: Arc<crate::environment::Environment>,
    ) -> ProviderResult<Vec<Candidate>> {
        let mut results = vec![];

        if let Ok(mut diriter) = fs::read_dir(&self.path).await {
            while let Some(entry) = diriter.next_entry().await.transpose() {
                //for entry in diriter {
                if entry.is_err() {
                    continue;
                }
                let direntry = entry.unwrap();
                let entrypath = &direntry.path();
                trace!("checking file {}", entrypath.display());
                let metadata = match fs::metadata(entrypath).await {
                    Ok(val) => val,
                    Err(_) => continue,
                };

                if !metadata.file_type().is_file() {
                    trace!("skipping {}: Not a file", entrypath.display());
                    continue;
                }

                // It's a file, check whether the name somehow matches
                let filename = direntry.file_name();
                let filename = match filename.to_str().to_owned() {
                    Some(name) => name,
                    None => {
                        trace!("Skipping {}: Invalid unicode name", entrypath.display());
                        continue;
                    }
                };

                if filename.starts_with(command) {
                    // Match!
                    let pwd = std::env::current_dir().unwrap();
                    let filename = pwd.join(filename).display().to_string().to_owned();

                    let mut candidate = Candidate {
                        package: filename.clone(),
                        origin: pwd.display().to_string(),
                        actions: Actions {
                            install: None,
                            execute: cmd!(&filename),
                        },
                        ..Candidate::default()
                    };

                    if !is_executable(entrypath) {
                        candidate.actions.install = Some(cmd!("chmod", "+x", &filename));
                    }
                    results.push(candidate);
                }
            }
            if !results.is_empty() {
                return Ok(results);
            }
        }
        Err(ProviderError::NotFound(command.to_string()))
    }
}