mant 0.11.0

Local-first TUI, structured CLI, and MCP server for manuals and Markdown
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
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211

//! Host-owned external URI activation.

use std::{
    io,
    process::{Child, Command, Stdio},
    thread,
};

/// Hand a type-validated external URI to the platform URL handler.
pub(super) fn open_uri(uri: &mant_ui::ExternalUri) -> Result<(), String> {
    let command = platform_command(uri.as_str());
    let child = spawn_silenced(command)
        .map_err(|error| format!("could not start the system link opener: {error}"))?;

    // URL handlers are intentionally asynchronous: some desktop launchers
    // remain alive for as long as the browser does. Reap the short-lived
    // helpers without blocking the terminal event loop.
    let _ = thread::Builder::new()
        .name("mant-link-opener".to_owned())
        .spawn(move || {
            let mut child = child;
            let _ = child.wait();
        });
    Ok(())
}

fn spawn_silenced(mut command: Command) -> io::Result<Child> {
    // A child inheriting these streams can consume TUI input or write ordinary
    // process diagnostics directly into the alternate screen.
    command
        .stdin(Stdio::null())
        .stdout(Stdio::null())
        .stderr(Stdio::null())
        .spawn()
}

fn platform_command(uri: &str) -> Command {
    #[cfg(target_os = "windows")]
    {
        let mut command = Command::new(windows_url_handler());
        command.args(["url.dll,FileProtocolHandler", uri]);
        command
    }

    #[cfg(target_os = "macos")]
    {
        let mut command = Command::new("open");
        command.arg(uri);
        command
    }

    #[cfg(all(unix, not(target_os = "macos")))]
    {
        let wsl_handler = running_under_wsl().then(wsl_windows_url_handler).flatten();
        linux_command(uri, wsl_handler.as_deref())
    }
}

#[cfg(target_os = "windows")]
fn windows_url_handler() -> std::path::PathBuf {
    windows_url_handler_from(std::env::var_os("SystemRoot"))
}

#[cfg(target_os = "windows")]
fn windows_url_handler_from(system_root: Option<std::ffi::OsString>) -> std::path::PathBuf {
    let root = system_root
        .map(std::path::PathBuf::from)
        .filter(|path| path.is_absolute())
        .unwrap_or_else(|| std::path::PathBuf::from(r"C:\Windows"));
    root.join("System32").join("rundll32.exe")
}

#[cfg(all(unix, not(target_os = "macos")))]
fn linux_command(uri: &str, wsl_handler: Option<&std::path::Path>) -> Command {
    if let Some(program) = wsl_handler {
        let mut command = Command::new(program);
        command.args(["url.dll,FileProtocolHandler", uri]);
        return command;
    }

    let mut command = Command::new("xdg-open");
    command.arg(uri);
    command
}

#[cfg(all(unix, not(target_os = "macos")))]
fn running_under_wsl() -> bool {
    std::env::var_os("WSL_INTEROP").is_some()
        || std::env::var_os("WSL_DISTRO_NAME").is_some()
        || std::fs::read_to_string("/proc/sys/kernel/osrelease")
            .is_ok_and(|release| release_identifies_wsl(&release))
}

#[cfg(all(unix, not(target_os = "macos")))]
fn release_identifies_wsl(release: &str) -> bool {
    let release = release.to_ascii_lowercase();
    release.contains("microsoft") || release.contains("wsl")
}

#[cfg(all(unix, not(target_os = "macos")))]
fn wsl_windows_url_handler() -> Option<std::path::PathBuf> {
    const DEFAULT_HANDLER: &str = "/mnt/c/Windows/System32/rundll32.exe";

    let default = std::path::PathBuf::from(DEFAULT_HANDLER);
    if default.is_file() {
        return Some(default);
    }

    // `wslpath` is supplied by WSL itself and accounts for a customized drive
    // mount root. Keep its diagnostics away from the active terminal too.
    let output = Command::new("wslpath")
        .args(["-u", r"C:\Windows\System32\rundll32.exe"])
        .stdin(Stdio::null())
        .stderr(Stdio::null())
        .output()
        .ok()?;
    if !output.status.success() {
        return None;
    }
    let path = std::str::from_utf8(&output.stdout).ok()?.trim();
    let path = std::path::PathBuf::from(path);
    path.is_file().then_some(path)
}

#[cfg(test)]
mod tests {
    use std::io::Write;

    use super::*;

    const STREAM_TEST_MODE: &str = "MANT_EXTERNAL_STREAM_TEST";
    const STREAM_SENTINEL: &str = "mant-external-stream-sentinel";
    const STREAM_TEST_NAME: &str =
        "external::tests::system_opener_does_not_inherit_process_streams";

    #[test]
    fn system_opener_does_not_inherit_process_streams() {
        match std::env::var(STREAM_TEST_MODE).as_deref() {
            Ok("emit") => {
                println!("{STREAM_SENTINEL}-stdout");
                eprintln!("{STREAM_SENTINEL}-stderr");
                std::io::stdout().flush().expect("flush stdout");
                std::io::stderr().flush().expect("flush stderr");
            }
            Ok("launch") => {
                let mut command = Command::new(std::env::current_exe().expect("test binary"));
                command
                    .args(["--exact", STREAM_TEST_NAME, "--nocapture"])
                    .env(STREAM_TEST_MODE, "emit");
                let mut child = spawn_silenced(command).expect("launch emitting child");
                assert!(child.wait().expect("wait for emitting child").success());
            }
            _ => {
                let output = Command::new(std::env::current_exe().expect("test binary"))
                    .args(["--exact", STREAM_TEST_NAME, "--nocapture"])
                    .env(STREAM_TEST_MODE, "launch")
                    .output()
                    .expect("run stream-isolation driver");
                assert!(output.status.success());
                assert!(!String::from_utf8_lossy(&output.stdout).contains(STREAM_SENTINEL));
                assert!(!String::from_utf8_lossy(&output.stderr).contains(STREAM_SENTINEL));
            }
        }
    }

    #[cfg(all(unix, not(target_os = "macos")))]
    #[test]
    fn wsl_detection_accepts_both_kernel_release_conventions() {
        assert!(release_identifies_wsl("6.18.33.2-microsoft-standard-WSL2"));
        assert!(release_identifies_wsl("4.4.0-19041-Microsoft"));
        assert!(!release_identifies_wsl("6.12.10-arch1-1"));
    }

    #[cfg(all(unix, not(target_os = "macos")))]
    #[test]
    fn linux_command_prefers_the_supplied_wsl_host_handler() {
        let program = std::path::Path::new("/windows/System32/rundll32.exe");
        let command = linux_command("https://example.test/docs", Some(program));

        assert_eq!(command.get_program(), program.as_os_str());
        assert_eq!(
            command.get_args().collect::<Vec<_>>(),
            ["url.dll,FileProtocolHandler", "https://example.test/docs"]
        );
    }

    #[cfg(all(unix, not(target_os = "macos")))]
    #[test]
    fn ordinary_linux_command_uses_xdg_open() {
        let command = linux_command("https://example.test/docs", None);

        assert_eq!(command.get_program(), "xdg-open");
        assert_eq!(
            command.get_args().collect::<Vec<_>>(),
            ["https://example.test/docs"]
        );
    }

    #[cfg(target_os = "windows")]
    #[test]
    fn windows_handler_is_absolute_and_never_uses_path_lookup() {
        assert_eq!(
            windows_url_handler_from(Some(std::ffi::OsString::from(r"D:\HostWindows"))),
            std::path::PathBuf::from(r"D:\HostWindows\System32\rundll32.exe")
        );
        assert_eq!(
            windows_url_handler_from(Some(std::ffi::OsString::from("relative"))),
            std::path::PathBuf::from(r"C:\Windows\System32\rundll32.exe")
        );
    }
}