agentool 0.2.0

Rust toolkit for AI agents: JSON Schema-defined tools for workspace files, search, web, Markdown, Git, memory, human-in-the-loop hooks, and todos.
Documentation 
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use std::fs;
use std::io::Write as _;
use std::path::{Path, PathBuf};
use std::time::{SystemTime, UNIX_EPOCH};

fn temp_path_for(path: &Path) -> PathBuf {
    let parent = path.parent().unwrap_or_else(|| Path::new("."));
    let file_name = path
        .file_name()
        .map(|name| name.to_string_lossy().into_owned())
        .unwrap_or_else(|| "agentool".to_string());
    let unique = SystemTime::now()
        .duration_since(UNIX_EPOCH)
        .map(|d| d.as_nanos())
        .unwrap_or(0);
    parent.join(format!(
        ".{file_name}.tmp.{}.{}",
        std::process::id(),
        unique
    ))
}

/// Write bytes through a same-directory temporary file and then rename it into place.
pub(crate) fn write_atomic(path: &Path, content: &[u8]) -> std::io::Result<()> {
    if let Some(parent) = path.parent() {
        fs::create_dir_all(parent)?;
    }

    let tmp = temp_path_for(path);
    let write_result = (|| {
        let mut file = fs::OpenOptions::new()
            .write(true)
            .create_new(true)
            .open(&tmp)?;
        file.write_all(content)?;
        file.sync_all()?;
        drop(file);
        fs::rename(&tmp, path)
    })();

    if write_result.is_err() {
        let _ = fs::remove_file(&tmp);
    }

    write_result
}

#[cfg(test)]
mod tests {
    use std::fs;
    use std::path::PathBuf;

    use super::write_atomic;

    fn tmp_dir() -> PathBuf {
        let dir = std::env::temp_dir().join(format!(
            "agentool_atomic_test_{}_{}",
            std::process::id(),
            std::time::SystemTime::now()
                .duration_since(std::time::UNIX_EPOCH)
                .map(|d| d.as_nanos())
                .unwrap_or(0)
        ));
        fs::create_dir_all(&dir).expect("create tmp");
        dir
    }

    #[test]
    fn write_atomic_creates_parent_directories_and_replaces_content() {
        let dir = tmp_dir();
        let path = dir.join("nested").join("data.txt");

        write_atomic(&path, b"first").expect("initial write");
        write_atomic(&path, b"second").expect("replacement write");

        assert_eq!(fs::read_to_string(&path).unwrap(), "second");
        let leftovers: Vec<_> = fs::read_dir(path.parent().unwrap())
            .unwrap()
            .map(|entry| entry.unwrap().file_name().to_string_lossy().into_owned())
            .collect();
        assert_eq!(leftovers, vec!["data.txt"]);

        let _ = fs::remove_dir_all(&dir);
    }
}