yog-cli 0.42.3

//! `yog.toml` — a mod project's manifest, the only build file mod authors
//! write.

use std::path::{Path, PathBuf};

/// The manifest's file name, in the project root.
pub const MANIFEST: &str = "yog.toml";
/// Where `yog build` generates the cargo project, under the project root.
pub const BUILD_DIR: &str = ".yog-build";
/// Plain crates.io dependencies.
pub const DEPS_SECTION: &str = "[dependencies]";
/// Other Yog mods' exports crates.
pub const EXPORT_DEPS_SECTION: &str = "[dependencies.exports]";
/// Rust edition when `[mod] edition` is absent.
pub const DEFAULT_EDITION: &str = "2024";
/// License of a mod, and of its exports crate, when none is given.
pub const DEFAULT_LICENSE: &str = "MIT OR Apache-2.0";
/// `yog-api` version when crates.io can't be asked (offline, etc.).
const FALLBACK_API_VERSION: &str = "0.96";

/// The current directory, if it's a mod project (has a `yog.toml`).
pub fn project_root() -> Result<PathBuf, String> {
    let root = std::env::current_dir().map_err(|e| e.to_string())?;
    if root.join(MANIFEST).is_file() {
        Ok(root)
    } else {
        Err(format!("no {MANIFEST} found in the current directory"))
    }
}

/// Parsed content of a `yog.toml` project file.
#[derive(Debug)]
pub struct YogToml {
    pub id: String,
    pub name: String,
    pub version: String,
    pub description: String,
    /// Translation keys of `name`/`description` when yog.toml gives them
    /// as `@<Set>.<name>` resources (see `resolve_metadata`).
    pub name_key: Option<String>,
    pub description_key: Option<String>,
    /// The mod's icon, an image source (`icon = "@Icons.logo"` resolved).
    pub icon: Option<String>,
    pub authors: Vec<String>,
    pub license: String,
    /// License for the generated `yog publish exports` bindings crate.
    /// Defaults to "MIT OR Apache-2.0" regardless of the mod's own license
    /// (AGPL propagating onto every consumer's dependency tree would kill
    /// adoption of the exports crate) — set `[mod] exports_license = "..."`
    /// to opt into matching the mod's own license instead.
    pub exports_license: Option<String>,
    /// The Minecraft version whose vanilla content it names (`[mod] datapack`).
    pub datapack: Option<String>,
    pub edition: Option<String>,
    /// Optional: path to yog-api for local/monorepo development.
    /// Set via [dev] yog_api_path = "..."  or YOG_API_PATH env var.
    pub yog_api_path: Option<String>,
    /// Optional: pin yog-api version as "yog_api = \"X.Y\"" in [dependencies].
    pub yog_api_version: Option<String>,
    /// User-declared dependencies from [dependencies] section — plain
    /// crates.io crates, used exactly as written.
    pub dependencies: Vec<(String, String)>,
    /// Other Yog mods this mod depends on, from `[dependencies.exports]`.
    /// Each entry `name = spec` maps to that mod's generated exports crate:
    /// `{name} = { package = "{name}-exports", ...spec }` — so mod code
    /// imports it under its own name (`use {name}::...`), same as a direct
    /// dependency, and two mod dependencies never collide under a shared
    /// alias (unlike the old name-contains-hyphen heuristic this replaced).
    pub mod_dependencies: Vec<(String, String)>,
    /// `[dev-dependencies]` — crates only `yog bench` benchmarks use.
    pub dev_dependencies: Vec<(String, String)>,
    /// Named dev-instance launch configs from `[run.<name>]` sections.
    pub run_configs: Vec<RunConfig>,
    /// Content of other mods (original Java mods, or Yog mods) this mod
    /// names, declared up front: `[external.<namespace>]` with `items`,
    /// `blocks`, `entities`, `recipes` (paths: `["cutting_board"]`).
    pub externals: Vec<External>,
}

/// One `[external.<namespace>]` section.
#[derive(Debug, Default, Clone)]
pub struct External {
    pub namespace: String,
    /// `kind` (`items`, `blocks`, `entities`, `recipes`) → paths.
    pub ids: Vec<(String, Vec<String>)>,
}

/// A `[run.<name>]` section: where to drop the built artifact and what to
/// launch afterwards, for a full `yog run <name>` dev-instance workflow.
#[derive(Debug, Default, Clone)]
pub struct RunConfig {
    pub name: String,
    /// Optional human-readable label (`name = "..."` inside `[run.X]`), for
    /// editors to show/edit instead of the raw dotted section-key id. Falls
    /// back to `name` (the id) when absent.
    pub display_name: Option<String>,
    /// Directory the built `.yog` gets copied into (e.g. an instance's `yog-mods/`).
    /// Relative paths resolve against the mod project root.
    pub export_dir: Option<String>,
    /// Executable to launch after export (e.g. `java`, a wrapper script, `./gradlew`).
    pub command: Option<String>,
    /// Arguments passed to `command`, in order.
    pub args: Vec<String>,
    /// Working directory for `command`. Relative paths resolve against the project root.
    pub cwd: Option<String>,
    /// Extra environment variables as `KEY=VALUE` pairs.
    pub env: Vec<(String, String)>,
}

impl YogToml {
    pub fn read(path: &Path) -> Result<Self, String> {
        let text = std::fs::read_to_string(path)
            .map_err(|e| format!("reading {}: {e}", path.display()))?;
        parse_yog_toml(&text)
    }

    /// Resolve where yog-api lives.  Priority:
    ///   1. YOG_API_PATH env var
    ///   2. [dev] yog_api_path in yog.toml
    ///   3. yog_api_version in [dependencies] (e.g. "0.5")
    ///   4. YOG_API_VERSION env var
    ///   5. latest from crates.io
    pub fn api_dep(&self) -> String {
        if let Ok(p) = std::env::var("YOG_API_PATH") {
            // Resolve to absolute so it works from any subdirectory
            let abs = PathBuf::from(&p)
                .canonicalize()
                .unwrap_or_else(|_| PathBuf::from(&p));
            return format!("yog-api = {{ path = {:?} }}", abs.to_string_lossy());
        }
        if let Some(p) = &self.yog_api_path {
            return format!("yog-api = {{ path = {p:?} }}");
        }
        let version = {
            let env_version = std::env::var("YOG_API_VERSION").ok();
            self.yog_api_version
                .as_deref()
                .or(env_version.as_deref())
                .map(|v| v.to_owned())
                .unwrap_or_else(latest_yog_api_version)
        };
        format!("yog-api = {:?}", version)
    }
}

// ── Reading ─────────────────────────────────────────────────────────────────

use yog_data::{Text, Value};
use yog_formats::manifest::ManifestFile;

/// `v` as TOML's inline syntax — how a dependency is written into Cargo.toml.
fn toml_inline(v: &Value) -> String {
    let quote = |s: &str| format!("\"{}\"", s.replace('\\', "\\\\").replace('"', "\\\""));
    match v {
        Value::Map(m) => {
            let fields: Vec<String> = m
                .iter()
                .map(|(k, v)| {
                    let key = if k.chars().all(|c| c.is_ascii_alphanumeric() || c == '-' || c == '_') { k.to_string() } else { quote(k) };
                    format!("{key} = {}", toml_inline(v))
                })
                .collect();
            format!("{{ {} }}", fields.join(", "))
        }
        Value::List(items) => format!("[{}]", items.iter().map(toml_inline).collect::<Vec<_>>().join(", ")),
        Value::Bool(b) => b.to_string(),
        Value::Int(n) => n.to_string(),
        Value::Float(f) => f.to_string(),
        other => quote(other.as_str().unwrap_or_default()),
    }
}

/// A text of `yog.toml` as `resolve_metadata` reads it: `@Set.key` or the words (`@@` for a leading `@`).
fn text_form(t: Text) -> Result<String, String> {
    match t {
        Text::Literal(s) => Ok(yog_data::typed::escape_at(&s)),
        Text::Res(r) => Ok(format!("@{}.{}", r.set, r.key)),
        Text::NameOf(_) | Text::Lang(_) => Err("a mod's name and description are text or a `.yres` text (`@Strings.mod_name`)".into()),
    }
}

/// Reads `yog.toml` (TOML, through Yog Data's schema: every problem with its line).
pub fn parse_yog_toml(text: &str) -> Result<YogToml, String> {
    // A dotted run header is nested tables to TOML: say how to write it.
    for (i, line) in text.lines().enumerate() {
        let l = line.trim();
        if let Some(name) = l.strip_prefix("[run.").and_then(|r| r.strip_suffix(']'))
            && name.contains('.')
            && !name.starts_with('"')
        {
            return Err(format!("yog.toml:{}: write the run target's name in quotes: [run.\"{name}\"]", i + 1));
        }
    }
    let read = yog_data::schema::from_toml::<ManifestFile>(text).map_err(|e| {
        e.0.iter()
            .map(|l| match l.at {
                Some(at) => format!("yog.toml:{}: {}{}", at.line, if l.path.is_root() { String::new() } else { format!("{}: ", l.path) }, l.message),
                None => format!("yog.toml: {}", l.message),
            })
            .collect::<Vec<_>>()
            .join("\n")
    })?;
    let f = read.value;
    let m = f.module;
    let mut dependencies = Vec::new();
    let mut mod_dependencies = Vec::new();
    let mut yog_api_version = None;
    for (name, spec) in f.dependencies.0 {
        match (name.as_str(), &spec) {
            ("exports", Value::Map(exports)) => mod_dependencies.extend(exports.iter().map(|(k, v)| (k.to_string(), toml_inline(v)))),
            ("yog-api" | "yog_api" | "yog_api_version", _) => yog_api_version = Some(spec.as_str().map(str::to_string).unwrap_or_else(|| toml_inline(&spec))),
            _ => dependencies.push((name, toml_inline(&spec))),
        }
    }
    let run_configs = f
        .run
        .0
        .into_iter()
        .map(|(name, r)| RunConfig {
            name,
            display_name: r.name,
            export_dir: r.export_dir,
            command: r.command,
            args: r.args,
            cwd: r.cwd,
            env: r.env.into_iter().filter_map(|kv| kv.split_once('=').map(|(k, v)| (k.to_string(), v.to_string()))).collect(),
        })
        .collect();
    let externals = f
        .external
        .0
        .into_iter()
        .map(|(namespace, e)| External {
            namespace,
            ids: [("items", e.items), ("blocks", e.blocks), ("entities", e.entities), ("recipes", e.recipes)]
                .into_iter()
                .filter(|(_, v)| !v.is_empty())
                .map(|(k, v)| (k.to_string(), v))
                .collect(),
        })
        .collect();
    let name = m.name.map(text_form).transpose()?;
    let description = m.description.map(text_form).transpose()?;
    let icon = m.icon.map(|i| match i {
        yog_data::Image::Source(s) => s,
        yog_data::Image::Res(r) => format!("@{}.{}", r.set, r.key),
    });
    Ok(YogToml {
        name: name.unwrap_or_else(|| m.id.clone()),
        version: m.version.unwrap_or_else(|| "0.1.0".into()),
        description: description.unwrap_or_default(),
        name_key: None,
        description_key: None,
        icon,
        authors: m.authors,
        license: m.license.unwrap_or_else(|| DEFAULT_LICENSE.into()),
        exports_license: m.exports_license,
        datapack: m.datapack,
        edition: m.edition,
        yog_api_path: f.dev.and_then(|d| d.yog_api_path),
        yog_api_version,
        dependencies,
        mod_dependencies,
        dev_dependencies: f.dev_dependencies.0.into_iter().map(|(k, v)| (k, toml_inline(&v))).collect(),
        run_configs,
        externals,
        id: m.id,
    })
}

/// Cargo derives a lib crate name from the package `name` by turning `-` into
/// `_`, but keeps case — so a mod `id` like "My-Mod" becomes the invalid
/// `My_Mod` and rustc warns on every build. `id` is a free-form project
/// identifier (not required to be a valid Rust ident), so the generated
/// wrapper pins `[lib] name` to a proper snake_case form instead.
pub fn to_snake_name(id: &str) -> String {
    let mut out = String::with_capacity(id.len());
    for c in id.chars() {
        if c == '-' || c == '_' {
            if !out.ends_with('_') {
                out.push('_');
            }
        } else if c.is_uppercase() {
            if !out.is_empty() && !out.ends_with('_') {
                out.push('_');
            }
            out.extend(c.to_lowercase());
        } else {
            out.push(c);
        }
    }
    out
}

/// rkyv version embedded at compile time via `build.rs`.
pub fn workspace_rkyv_version() -> String {
    env!("RKYV_VERSION").to_string()
}

/// Fetch the latest non-yanked version of `yog-api` from crates.io.
pub fn latest_yog_api_version() -> String {
    match std::process::Command::new("cargo")
        .args(["search", "yog-api", "--limit", "1"])
        .output()
    {
        Ok(out) if out.status.success() => {
            String::from_utf8_lossy(&out.stdout)
                .lines()
                .next()
                .and_then(|l| {
                    let mut parts = l.split_whitespace();
                    parts.next(); // skip crate name (e.g. "yog-api")
                    if parts.next() == Some("=") {
                        // skip the "=" separator
                        parts.next().map(|v| v.trim_matches('"').to_owned())
                    } else {
                        None
                    }
                })
                .unwrap_or_else(|| FALLBACK_API_VERSION.into())
        }
        _ => FALLBACK_API_VERSION.into(),
    }
}

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

    /// Yog-VLSI's manifest, as written — what the TOML reader that replaces
    /// this one must read the same.
    const VLSI: &str = r#"
[mod]
id          = "yog-vlsi"
name        = "@Strings.mod_name"
version     = "0.3.0"
description = "@Strings.mod_description"
authors     = ["F000NK", "Yog Team"]
license     = "AGPL-3.0-only"
edition     = "2024"

[dependencies]
serde      = { version = "1", features = ["derive"] }
serde_json = "1"
yog-api    = "0.93"
yog-kit    = "0.4"

[dependencies.exports]
yog-pipes = "0.5"

## a comment
[run."forge-1.21.1"]
name       = "Forge 1.21.1"
export_dir = "../Yog-Mod-Loader/forge/run/yog-mods"
command    = "./gradlew"
args       = ["runClient", "-Pminecraft_version=1.21.1"]
cwd        = "../Yog-Mod-Loader/forge"
env        = ["JAVA_HOME=/usr/lib/jvm/java-21-openjdk-amd64"]

[external.farmersdelight]
items  = ["cutting_board", "tomato"]
blocks = ["stove"]
"#;

    #[test]
    fn reads_a_real_manifest() {
        let t = parse_yog_toml(VLSI).unwrap();
        assert_eq!((t.id.as_str(), t.name.as_str(), t.version.as_str()), ("yog-vlsi", "@Strings.mod_name", "0.3.0"));
        assert_eq!(t.authors, ["F000NK", "Yog Team"]);
        assert_eq!(t.license, "AGPL-3.0-only");
        assert_eq!(t.yog_api_version.as_deref(), Some("0.93"), "yog-api is taken out of the dependencies");
        let deps: Vec<&str> = t.dependencies.iter().map(|(n, _)| n.as_str()).collect();
        assert_eq!(deps, ["serde", "serde_json", "yog-kit"]);
        assert_eq!(t.mod_dependencies, [("yog-pipes".to_string(), "\"0.5\"".to_string())]);
        let run = &t.run_configs[0];
        assert_eq!((run.name.as_str(), run.display_name.as_deref()), ("forge-1.21.1", Some("Forge 1.21.1")));
        assert_eq!(run.args, ["runClient", "-Pminecraft_version=1.21.1"]);
        assert_eq!(run.env, [("JAVA_HOME".to_string(), "/usr/lib/jvm/java-21-openjdk-amd64".to_string())]);
        let ext = &t.externals[0];
        assert_eq!(ext.namespace, "farmersdelight");
        assert_eq!(ext.ids[0], ("items".to_string(), vec!["cutting_board".to_string(), "tomato".to_string()]));
    }

    #[test]
    fn problems_say_where() {
        let e = parse_yog_toml("[mod]\nid = \"m\"\n\n[run.forge-1.21.1]\nname = \"F\"\n").unwrap_err();
        assert_eq!(e, "yog.toml:4: write the run target's name in quotes: [run.\"forge-1.21.1\"]");
        let e = parse_yog_toml("[mod]\nid = \"m\"\nautors = [\"me\"]\n\n[external.create]\nitem = [\"wrench\"]\n").unwrap_err();
        assert_eq!(e.lines().collect::<Vec<_>>(), [
            "yog.toml:3: mod.autors: unknown field `autors` — did you mean `authors`?",
            "yog.toml:6: external.create.item: unknown field `item` — did you mean `items`?",
        ]);
        let t = parse_yog_toml("[mod]\nid = \"m\"\nname = \"@@me\"\n").unwrap();
        assert_eq!(t.name, "@@me", "a literal @ stays escaped for resolve_metadata");
    }

    #[test]
    fn needs_an_id() {
        assert!(parse_yog_toml("[mod]\nname = \"x\"").is_err());
        let t = parse_yog_toml("[mod]\nid = \"m\"").unwrap();
        assert_eq!((t.name.as_str(), t.version.as_str()), ("m", "0.1.0"), "defaults");
    }
}