legacympt-rs/mpt/src/util.rs

use addonscript::manifest::{Manifest, Repository};
use anyhow::Context;
use crossterm::style::{Attribute, Attributes, Color, ContentStyle, Stylize};
use indicatif::ProgressStyle;
use percent_encoding::percent_decode;
use std::{
    collections::HashMap,
    io,
    path::{Path, PathBuf},
    string::FromUtf8Error,
};
use thiserror::Error;
use url::Url;
use walkdir::WalkDir;

use crate::config::Config;

/// reads and parses the config from the current working directory
pub async fn parse_config() -> anyhow::Result<Config> {
    let conf = tokio::fs::read("modpacktoolsconfig.toml").await?;
    Ok(toml::from_slice(&conf)?)
}

/// parses the config from the current working directory, reads the location of
/// the manifest file from it, parses the manifest and returns both the conig
/// and the manifest.
pub async fn parse_config_and_manifest() -> anyhow::Result<(Config, Manifest)> {
    let config = parse_config().await?;
    let src = Path::new(&config.locations.src);

    let path = if src.join("modpack.json5").exists() {
        src.join("modpack.json5")
    } else {
        src.join("modpack.json")
    };

    let data = tokio::fs::read(path).await?;
    let data = std::str::from_utf8(&data)?;
    let manifest = json5::from_str::<Manifest>(data)?;

    Ok((config, manifest))
}

#[derive(Debug, Error, PartialEq, Eq)]
pub enum MavenParseError {
    #[error("Maven Artifact specifier has invalid format!")]
    InvalidFormat,
    #[error("Url parse error while processing maven artifact: {0}")]
    UrlParseError(#[from] url::ParseError),
}

/// parses a maven artifact specifier and generates a URL to the artifact in a
/// given maven repo.
pub fn mvn_artifact_to_url(art: &str, repo: &Repository) -> Result<Url, MavenParseError> {
    let mut splits = art.split(':');

    let group_id = splits.next().ok_or(MavenParseError::InvalidFormat)?;
    let artifact_id = splits.next().ok_or(MavenParseError::InvalidFormat)?;
    let version = splits.next().ok_or(MavenParseError::InvalidFormat)?;

    if splits.count() != 0 {
        return Err(MavenParseError::InvalidFormat);
    }

    let mut url = repo.url.clone();
    if !url.path().ends_with('/') {
        url.set_path(&format!("{}/", repo.url.path()));
    }

    let url = url.join(&format!(
        "{gid}/{aid}/{v}/{aid}-{v}.jar",
        gid = group_id.replace('.', "/"),
        aid = artifact_id,
        v = version
    ))?;

    Ok(url)
}

/// convenience trait to color strings with given preset styles for the
/// modpacktools CLI
pub trait CliStyle: Stylize {
    /// formats the object with the style used for information messages
    fn info(self) -> Self::Styled;
}

impl<T: Stylize> CliStyle for T
where
    T::Styled: AsRef<ContentStyle> + AsMut<ContentStyle>,
{
    fn info(self) -> T::Styled {
        let mut s = self.stylize();
        s.as_mut().foreground_color = Some(Color::Cyan);
        s.as_mut().attributes = Attributes::from(Attribute::Italic);
        s
    }
}

/// the default style for progress bars
pub fn progress_style() -> ProgressStyle {
    ProgressStyle::default_bar()
        .template("{prefix:.bold} [{wide_bar:.green}] {pos}/{len}")
        .progress_chars("█▇▆▅▄▃▂▁ ")
}

/// creates the modpacktools temporary directory (set in the config)
pub async fn make_tmp_dir(config: &Config) -> anyhow::Result<()> {
    tokio::fs::create_dir_all(&config.locations.temp_dir)
        .await
        .context("Failed to create temporary directory")?;
    Ok(())
}

/// Converts a vec of addonscript repositories into a map of the ID and the
/// repo.
#[inline]
pub fn repo_map(repos: Vec<Repository>) -> HashMap<String, Repository> {
    repos.into_iter().map(|r| (r.id.clone(), r)).collect()
}

/// Parses a curseforge artifact found in modpack.json files into the project id
/// and file id.
pub fn parse_curseforge_artifact(artifact: &str) -> Result<(&str, &str), MavenParseError> {
    let mut splits = artifact.split(':').skip(1);
    let p_id = splits.next().ok_or(MavenParseError::InvalidFormat)?;
    let f_id = splits.next().ok_or(MavenParseError::InvalidFormat)?;

    if splits.count() != 0 {
        return Err(MavenParseError::InvalidFormat);
    }

    Ok((p_id, f_id))
}

#[derive(Debug, Error, PartialEq, Eq)]
pub enum UrlFileNameError {
    #[error("URL is base URL without file name!")]
    BaseUrl,
    #[error("URL file name is invalid utf8: {0}")]
    InvalidUtf8(#[from] FromUtf8Error),
}

/// Gets the last path segment (file name) of a URL
pub fn url_file_name(url: &Url) -> Result<String, UrlFileNameError> {
    let file_name = url
        .path_segments()
        .map(Iterator::last)
        .flatten()
        .ok_or(UrlFileNameError::BaseUrl)?;

    if file_name.is_empty() {
        return Err(UrlFileNameError::BaseUrl);
    }

    let bytes = percent_decode(file_name.as_bytes()).collect::<Vec<_>>();
    Ok(String::from_utf8(bytes)?)
}

/// Copies a directory inclding all files
pub async fn copy_dir(from: PathBuf, to: PathBuf) -> io::Result<()> {
    for file in WalkDir::new(&from) {
        let file = file?;

        let is_dir = file.path().is_dir();
        let target = to.join(
            file.path()
                .strip_prefix(&from)
                // this should be safe
                .expect("Couldn't strip base path"),
        );

        if is_dir {
            tokio::fs::create_dir_all(target).await?;
        } else {
            tokio::fs::copy(file.path(), target).await?;
        }
    }

    Ok(())
}

#[cfg(test)]
mod tests {
    use addonscript::manifest::RepositoryType;

    use super::*;

    fn repo() -> Repository {
        Repository {
            id: "test".into(),
            repo_type: RepositoryType::Maven,
            url: Url::parse("https://example.com/maven").unwrap(),
        }
    }

    #[test]
    fn artifact_to_url_valid() {
        assert_eq!(
            mvn_artifact_to_url("de.mzte:test:0.1", &repo()).unwrap(),
            Url::parse("https://example.com/maven/de/mzte/test/0.1/test-0.1.jar").unwrap(),
        );

        assert_eq!(
            mvn_artifact_to_url("test:test:test", &repo()).unwrap(),
            Url::parse("https://example.com/maven/test/test/test/test-test.jar").unwrap(),
        );
    }

    #[test]
    fn artifact_to_url_invalid() {
        assert!(mvn_artifact_to_url("test", &repo()).is_err());
        assert!(mvn_artifact_to_url("test:test", &repo()).is_err());
        assert!(mvn_artifact_to_url("test:test:test:test", &repo()).is_err());
    }

    #[test]
    fn url_file_name_valid() {
        assert_eq!(
            url_file_name(&Url::parse("https://example.com/test.txt").unwrap()),
            Ok("test.txt".to_string())
        );

        assert_eq!(
            url_file_name(&Url::parse("https://example.com/test").unwrap()),
            Ok("test".to_string())
        );
    }

    #[test]
    fn url_file_name_invalid() {
        assert!(url_file_name(&Url::parse("https://example.com").unwrap()).is_err());
    }

    #[test]
    fn curse_artifact_valid() {
        assert_eq!(parse_curseforge_artifact("x:a:b"), Ok(("a", "b")));
    }

    #[test]
    fn curse_artifact_invalid() {
        assert!(parse_curseforge_artifact("x").is_err());
        assert!(parse_curseforge_artifact("x:x:x:x").is_err());
    }
}