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

#![allow(clippy::unwrap_or_default)]
#![allow(clippy::useless_vec)]

use execute::Execute;
use std::{
    env, path,
    process::{Command, Stdio},
};

pub fn get_project_root_path() -> Option<String> {
    let current_dir = env::current_dir().unwrap();
    let mut dir = walk_reverse_dir(current_dir.as_path());

    if dir.is_none() {
        let mut command = Command::new("git");
        command.arg("rev-parse").arg("--show-toplevel");

        command.current_dir(current_dir.clone());

        command.stdout(Stdio::piped());
        command.stderr(Stdio::piped());

        let output = command.execute_output().unwrap();

        if !output.status.success() {
            dir = Some(current_dir.to_str().unwrap().to_string());
        } else {
            let output = String::from_utf8(output.stdout).unwrap();
            dir = Some(output.trim().to_string());
        }
    }

    dir
}

fn walk_reverse_dir(path: &path::Path) -> Option<String> {
    let current_path = path.to_path_buf();
    let map_files = vec![
        ("package-lock.json", "npm"),
        ("npm-shrinkwrap.json", "npm"),
        ("yarn.lock", "yarn"),
        ("pnpm-lock.yaml", "pnpm"),
        ("bun.lockb", "bun"),
    ];

    for (file, _) in map_files.iter() {
        let lock_file = current_path.join(file);

        if lock_file.exists() {
            return Some(current_path.to_str().unwrap().to_string());
        }
    }

    if let Some(parent) = path.parent() {
        return walk_reverse_dir(parent);
    }

    None
}

#[cfg(test)]
mod tests {
    use super::*;

    use std::fs::{remove_file, File};
    use std::path::Path;

    fn create_agent_file(path: &Path) -> File {
        File::create(path).expect("File not created")
    }

    fn delete_agent_file(path: &Path) {
        remove_file(path).expect("File not deleted");
    }

    #[test]
    fn npm_root_project() {
        let path = std::env::current_dir().expect("Current user home directory");
        let npm_lock = path.join("package-lock.json");

        create_agent_file(&npm_lock);

        let project_root = get_project_root_path();

        assert_eq!(project_root, Some(path.to_str().unwrap().to_string()));

        delete_agent_file(&npm_lock);
    }

    #[test]
    fn yarn_root_project() {
        let path = std::env::current_dir().expect("Current user home directory");
        let yarn_lock = path.join("yarn.lock");

        create_agent_file(&yarn_lock);

        let project_root = get_project_root_path();

        assert_eq!(project_root, Some(path.to_str().unwrap().to_string()));

        delete_agent_file(&yarn_lock);
    }

    #[test]
    fn pnpm_root_project() {
        let path = std::env::current_dir().expect("Current user home directory");
        let pnpm_lock = path.join("pnpm-lock.yaml");

        create_agent_file(&pnpm_lock);

        let project_root = get_project_root_path();

        assert_eq!(project_root, Some(path.to_str().unwrap().to_string()));

        delete_agent_file(&pnpm_lock);
    }

    #[test]
    fn bun_root_project() {
        let path = std::env::current_dir().expect("Current user home directory");
        let bun_lock = path.join("bun.lockb");

        create_agent_file(&bun_lock);

        let project_root = get_project_root_path();

        assert_eq!(project_root, Some(path.to_str().unwrap().to_string()));

        delete_agent_file(&bun_lock);
    }

    #[test]
    fn git_root_project() {
        let path = std::env::current_dir().expect("Current user home directory");

        let project_root = get_project_root_path();

        assert_eq!(project_root, Some(path.to_str().unwrap().to_string()));
    }
}