wdl-cli 0.1.2

//! Sources for a WDL documents used in analysis.

use std::path::Path;
use std::path::PathBuf;

use anyhow::Result;
use anyhow::anyhow;
use anyhow::bail;
use path_clean::clean;
use url::Url;
use wdl_analysis::Analyzer;
use wdl_engine::path::parse_url;

/// A source for an analysis.
#[derive(Clone, Debug)]
pub enum Source {
    /// A remote URL.
    Remote(Url),

    /// A local file.
    File(Url),

    /// A local directory.
    Directory(PathBuf),
}

impl Source {
    /// Attempts to reference the source as a URL.
    pub fn as_url(&self) -> Option<&Url> {
        match self {
            Source::Remote(url) | Source::File(url) => Some(url),
            Source::Directory(_) => None,
        }
    }

    /// Registers the source within an [`Analyzer`].
    pub async fn register<T: Send + Clone + 'static>(
        self,
        analyzer: &mut Analyzer<T>,
    ) -> Result<()> {
        match self {
            Source::Remote(url) | Source::File(url) => analyzer.add_document(url).await,
            Source::Directory(path) => analyzer.add_directory(path).await,
        }
    }
}

impl std::fmt::Display for Source {
    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
        match self {
            Source::Remote(url) => write!(f, "{url}"),
            Source::File(url) => write!(f, "{url}"),
            Source::Directory(path) => write!(f, "{path}", path = path.display()),
        }
    }
}

impl std::str::FromStr for Source {
    type Err = anyhow::Error;

    fn from_str(s: &str) -> Result<Self, Self::Err> {
        if let Some(url) = parse_url(s) {
            return Ok(Self::Remote(url));
        }

        let path = Path::new(s);

        let path = std::path::absolute(path)
            .map_err(|_| anyhow!("failed to convert `{path}` to a URI", path = path.display()))
            .map(|path| clean(&path))?;

        if !path.exists() {
            bail!("source file `{s}` does not exist");
        }

        if path.is_dir() {
            return Ok(Source::Directory(path));
        } else if path.is_file() {
            if let Ok(url) = Url::from_file_path(&path) {
                return Ok(Source::File(url));
            }
        }

        bail!("failed to convert `{s}` to a URI")
    }
}

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

    #[test]
    fn file() {
        let file = tempfile::NamedTempFile::new().unwrap();
        let path = std::path::absolute(file.path()).unwrap();

        let source = path.to_str().unwrap().parse::<Source>().unwrap();
        assert!(matches!(source, Source::File(_)));
        let url = source.as_url().unwrap();
        assert_eq!(url.scheme(), "file");
        assert_eq!(url.to_file_path().unwrap(), path);
    }

    #[test]
    fn directory() {
        let dir = tempfile::TempDir::new().unwrap();
        let name = dir.path().as_os_str().to_str().unwrap();

        assert!(matches!(name.parse().unwrap(),
            Source::Directory(path)
            if path.as_os_str().to_str().unwrap() == name));
    }

    #[test]
    fn url() {
        const EXAMPLE: &str = "https://example.com/";
        assert!(matches!(EXAMPLE.parse().unwrap(),
            Source::Remote(url)
            if url.as_str()
                == EXAMPLE
        ));
    }

    #[test]
    fn missing_file() {
        let err = "a-random-file-that-doesnt-exist.txt"
            .parse::<Source>()
            .unwrap_err();

        assert_eq!(
            err.to_string(),
            "source file `a-random-file-that-doesnt-exist.txt` does not exist"
        );
    }

    #[test]
    fn invalid_source() {
        let err = "".parse::<Source>().unwrap_err();

        assert_eq!(err.to_string(), "failed to convert `` to a URI");
    }
}