cmdq 0.1.4

A PTY-hosted command queue: type the next command while one is still running.
Documentation 
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use std::ffi::OsString;
use std::path::PathBuf;

pub(crate) fn absolute_path(path: PathBuf) -> Option<PathBuf> {
    path.is_absolute().then_some(path)
}

pub(crate) fn xdg_data_home() -> Option<PathBuf> {
    std::env::var_os("XDG_DATA_HOME").and_then(xdg_data_home_from_os)
}

pub(crate) fn xdg_data_home_from_os(dir: OsString) -> Option<PathBuf> {
    if dir.is_empty() {
        return None;
    }
    let path = PathBuf::from(dir);
    path.is_absolute().then_some(path)
}

pub(crate) fn data_dir() -> Option<PathBuf> {
    xdg_data_home()
        .or_else(|| dirs::data_dir().and_then(absolute_path))
        .or_else(|| dirs::home_dir().and_then(absolute_path))
}

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

    #[test]
    fn xdg_data_home_requires_absolute_path() {
        assert_eq!(xdg_data_home_from_os(OsString::from("")), None);
        assert_eq!(xdg_data_home_from_os(OsString::from("relative/path")), None);

        let absolute = if cfg!(windows) {
            OsString::from(r"C:\Users\me\AppData\Local")
        } else {
            OsString::from("/tmp/cmdq-xdg")
        };
        assert_eq!(
            xdg_data_home_from_os(absolute.clone()),
            Some(PathBuf::from(absolute))
        );
    }

    #[test]
    fn absolute_path_rejects_relative_fallbacks() {
        assert_eq!(absolute_path(PathBuf::from("relative")), None);

        let absolute = if cfg!(windows) {
            PathBuf::from(r"C:\Users\me")
        } else {
            PathBuf::from("/Users/me")
        };
        assert_eq!(absolute_path(absolute.clone()), Some(absolute));
    }
}