zoi-lua 1.25.3

Advanced Package Manager & Environment Orchestrator
Documentation 
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use mlua::{self, Lua, LuaSerdeExt, Table, Value};
use serde::Deserialize;
use zoi_core::utils;
/// Exposes HTTP and Git-forge utilities to the Lua environment.
///
/// These functions enable dynamic package definitions by allowing them to:
/// - `UTILS.FETCH.url`: Fetch raw text content (e.g. version files, checksums).
/// - `UTILS.FETCH.<FORGE>.LATEST`: Query Git forges (GitHub, GitLab, etc.) for
///   the latest tags, releases, or commit SHAs.
///
/// All network requests respect Zoi's global `--offline` and timeout settings.
/// Adds basic HTTP fetching utilities to the `UTILS.FETCH` table.
///
/// # Errors
///
/// Returns an error if the `UTILS` table cannot be found or if setting the
/// `FETCH` table fails.
pub fn add_fetch_util(lua: &Lua) -> Result<(), mlua::Error> {
    let fetch_table = lua.create_table()?;

    let fetch_fn =
        lua.create_function(|_, url: String| -> Result<String, mlua::Error> {
            let client = utils::get_http_client()
                .map_err(|e| mlua::Error::RuntimeError(e.to_string()))?;
            let response = client
                .get(url)
                .send()
                .map_err(|e| mlua::Error::RuntimeError(e.to_string()))?;
            let text = response
                .text()
                .map_err(|e| mlua::Error::RuntimeError(e.to_string()))?;
            Ok(text)
        })?;
    fetch_table.set("url", fetch_fn)?;

    let utils_table: Table = lua.globals().get("UTILS")?;
    utils_table.set("FETCH", fetch_table)?;

    Ok(())
}

/// Arguments for Git-related fetch operations.
#[derive(Deserialize)]
struct GitArgs {
    /// The Git repository in "owner/repo" format.
    repo: String,
    /// The optional domain for the Git forge (e.g. `<https://api.github.com>`).
    domain: Option<String>,
    /// The optional branch to fetch from.
    branch: Option<String>
}

/// Helper function to fetch and parse JSON from a URL.
fn fetch_json(url: &str) -> Result<serde_json::Value, mlua::Error> {
    let client = utils::get_http_client()
        .map_err(|e| mlua::Error::RuntimeError(e.to_string()))?;

    let response = client
        .get(url)
        .send()
        .map_err(|e| mlua::Error::RuntimeError(e.to_string()))?;

    if !response.status().is_success() {
        return Err(mlua::Error::RuntimeError(format!(
            "Request to {url} failed with status: {} and body: {}",
            response.status(),
            response.text().unwrap_or_else(|_| "N/A".to_string())
        )));
    }

    let text = response
        .text()
        .map_err(|e| mlua::Error::RuntimeError(e.to_string()))?;
    serde_json::from_str(&text)
        .map_err(|e| mlua::Error::RuntimeError(e.to_string()))
}

/// Adds Git-forge specific fetching utilities (GitHub, GitLab, Gitea, Forgejo)
/// to the `UTILS.FETCH` table.
///
/// # Errors
///
/// Returns an error if the `UTILS` or `FETCH` tables cannot be found, or if
/// creating/setting provider tables fails.
pub fn add_git_fetch_util(lua: &Lua) -> Result<(), mlua::Error> {
    let utils_table: Table = lua.globals().get("UTILS")?;
    let fetch_table: Table = utils_table.get("FETCH")?;

    for provider in ["GITHUB", "GITLAB", "GITEA", "FORGEJO"] {
        let provider_table = lua.create_table()?;
        let latest_table = lua.create_table()?;

        for what in ["tag", "release", "commit"] {
            let get_latest_fn =
                lua.create_function(move |lua, args: Table| {
                    let git_args: GitArgs =
                        lua.from_value(Value::Table(args)).map_err(|e| {
                            mlua::Error::RuntimeError(format!(
                                "Invalid arguments: {e}"
                            ))
                        })?;

                    let base_url = match provider {
                        "GITHUB" => git_args.domain.unwrap_or_else(|| {
                            "https://api.github.com".to_string()
                        }),
                        "GITLAB" => git_args.domain.unwrap_or_else(|| {
                            "https://gitlab.com".to_string()
                        }),
                        "GITEA" => git_args
                            .domain
                            .unwrap_or_else(|| "https://gitea.com".to_string()),
                        "FORGEJO" => git_args.domain.unwrap_or_else(|| {
                            "https://codeberg.org".to_string()
                        }),
                        _ => unreachable!()
                    };

                    let url = match (provider, what) {
                        ("GITHUB", "tag") => {
                            format!("{base_url}/repos/{}/tags", git_args.repo)
                        }
                        ("GITHUB", "release") => {
                            format!(
                                "{base_url}/repos/{}/releases/latest",
                                git_args.repo
                            )
                        }
                        ("GITHUB", "commit") => format!(
                            "{base_url}/repos/{}/commits?sha={}",
                            git_args.repo,
                            git_args.branch.as_deref().unwrap_or("HEAD")
                        ),

                        ("GITLAB", "tag") => format!(
                            "{base_url}/api/v4/projects/{}/repository/tags",
                            urlencoding::encode(&git_args.repo)
                        ),
                        ("GITLAB", "release") => format!(
                            "{base_url}/api/v4/projects/{}/releases",
                            urlencoding::encode(&git_args.repo)
                        ),
                        ("GITLAB", "commit") => format!(
                            "{base_url}/api/v4/projects/{}/repository/commits?\
                             ref_name={}",
                            urlencoding::encode(&git_args.repo),
                            git_args.branch.as_deref().unwrap_or("HEAD")
                        ),

                        ("GITEA" | "FORGEJO", "tag") => {
                            format!(
                                "{base_url}/api/v1/repos/{}/tags",
                                git_args.repo
                            )
                        }
                        ("GITEA" | "FORGEJO", "release") => {
                            format!(
                                "{base_url}/api/v1/repos/{}/releases/latest",
                                git_args.repo
                            )
                        }
                        ("GITEA" | "FORGEJO", "commit") => format!(
                            "{base_url}/api/v1/repos/{}/commits?sha={}",
                            git_args.repo,
                            git_args.branch.as_deref().unwrap_or("HEAD")
                        ),
                        _ => unreachable!()
                    };

                    let json = fetch_json(&url)?;

                    let result = match (provider, what) {
                        ("GITHUB" | "GITEA" | "FORGEJO", "tag") => json
                            .as_array()
                            .and_then(|a| a.first())
                            .and_then(|t| t.get("name"))
                            .and_then(|v| v.as_str()),
                        ("GITHUB" | "GITEA" | "FORGEJO", "release") => {
                            json.get("tag_name").and_then(|v| v.as_str())
                        }
                        ("GITHUB" | "GITEA" | "FORGEJO", "commit") => json
                            .as_array()
                            .and_then(|a| a.first())
                            .and_then(|c| c.get("sha"))
                            .and_then(|v| v.as_str()),

                        ("GITLAB", "tag") => json
                            .as_array()
                            .and_then(|a| a.first())
                            .and_then(|t| t.get("name"))
                            .and_then(|v| v.as_str()),
                        ("GITLAB", "release") => json
                            .as_array()
                            .and_then(|a| a.first())
                            .and_then(|r| r.get("tag_name"))
                            .and_then(|v| v.as_str()),
                        ("GITLAB", "commit") => json
                            .as_array()
                            .and_then(|a| a.first())
                            .and_then(|c| c.get("id"))
                            .and_then(|v| v.as_str()),
                        _ => unreachable!()
                    };

                    result.map(std::string::ToString::to_string).ok_or_else(
                        || {
                            mlua::Error::RuntimeError(
                                "Could not extract value from API response"
                                    .to_string()
                            )
                        }
                    )
                })?;
            latest_table.set(what, get_latest_fn)?;
        }

        provider_table.set("LATEST", latest_table)?;
        fetch_table.set(provider, provider_table)?;
    }

    Ok(())
}