doom-eternal 0.1.0

Rust CLI for the Xylex DOOM Eternal texture and install workflow
Documentation
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use std::{
    fs,
    path::{Path, PathBuf},
    time::SystemTime,
};

use serde::Serialize;

use crate::{
    bim::default_autoheckin_path,
    context::AppContext,
    installer::discover_game_root,
    manifest::RequiredEditableManifest,
    sets::{find_set_tokens, normalize_set_name, parse_set_token},
    source_pack::{detect_source_set, discover_local_source_candidates, resolve_source_warehouse},
};

pub const DEFAULT_OUTPUT_MOD_ROOT: &str = "dist/xylex-rtx-slayer-pack";
pub const DEFAULT_ZIP_OUTPUT: &str = "dist/xylex-rtx-slayer-pack.zip";
pub const DEFAULT_EDITABLE_ROOT: &str = "build/rtx-editable-source";
pub const DEFAULT_MANIFEST_NAME: &str = "required-editable-textures.json";

#[derive(Debug, Clone, Default)]
pub struct RepoStateOptions {
    pub source_path: Option<PathBuf>,
    pub target_set: Option<String>,
    pub editable_root: Option<PathBuf>,
    pub manifest: Option<PathBuf>,
    pub output_mod_root: Option<PathBuf>,
    pub zip_output: Option<PathBuf>,
    pub converter_path: Option<PathBuf>,
}

#[derive(Debug, Clone)]
pub struct ManifestCandidate {
    pub path: PathBuf,
    pub source_set: Option<String>,
    pub target_set: Option<String>,
    pub modified_at: SystemTime,
}

#[derive(Debug, Clone, Serialize)]
#[serde(rename_all = "camelCase")]
pub struct RepoState {
    pub source_pack: Option<PathBuf>,
    pub source_pack_reason: Option<String>,
    pub source_set: Option<String>,
    pub source_set_reason: Option<String>,
    pub target_set: Option<String>,
    pub target_set_reason: Option<String>,
    pub editable_root: PathBuf,
    pub editable_root_reason: String,
    pub manifest_path: Option<PathBuf>,
    pub manifest_reason: Option<String>,
    pub manifest_source_set: Option<String>,
    pub manifest_target_set: Option<String>,
    pub output_mod_root: PathBuf,
    pub zip_output: PathBuf,
    pub converter_path: PathBuf,
    pub converter_available: bool,
    pub converter_reason: Option<String>,
    pub game_root: Option<PathBuf>,
    pub game_root_reason: Option<String>,
}

pub fn build_repo_state(ctx: &AppContext, options: RepoStateOptions) -> RepoState {
    let output_mod_root = options
        .output_mod_root
        .as_deref()
        .map(|path| ctx.repo().repo_path(path))
        .unwrap_or_else(|| ctx.repo().repo_path(DEFAULT_OUTPUT_MOD_ROOT));
    let zip_output = options
        .zip_output
        .as_deref()
        .map(|path| ctx.repo().repo_path(path))
        .unwrap_or_else(|| ctx.repo().repo_path(DEFAULT_ZIP_OUTPUT));

    let (source_pack, source_pack_reason) = match options.source_path.as_deref() {
        Some(path) => (Some(ctx.repo().repo_path(path)), Some("explicit --source-path".to_string())),
        None => detect_source_pack(ctx),
    };

    let (source_set, source_set_reason) = source_pack
        .as_deref()
        .map(|source_pack| match resolve_source_warehouse(ctx.repo(), source_pack) {
            Ok((warehouse, _)) => match detect_source_set(&warehouse) {
                Ok(source_set) => (
                    Some(source_set),
                    Some(format!("detected from source pack {}", warehouse.display())),
                ),
                Err(_) => (
                    None,
                    Some("source pack exists but warehouse layout was not readable".to_string()),
                ),
            },
            Err(_) => (
                None,
                Some("source pack exists but warehouse layout was not readable".to_string()),
            ),
        })
        .unwrap_or((None, None));

    let (manifest_path, manifest_reason, manifest_source_set, manifest_target_set) =
        infer_manifest_path(ctx, options.manifest.as_deref(), options.target_set.as_deref());
    let manifest_candidate = manifest_path
        .as_deref()
        .filter(|path| path.is_file())
        .and_then(load_manifest_candidate);

    let (target_set, target_set_reason) = infer_target_set(
        options.target_set.as_deref(),
        manifest_candidate.as_ref(),
        &output_mod_root,
        source_set.as_deref(),
    );
    let (editable_root, editable_root_reason) = infer_editable_root(
        ctx,
        options.editable_root.as_deref(),
        target_set.as_deref(),
        manifest_candidate.as_ref(),
    );

    let (converter_path, converter_reason) = match options.converter_path.as_deref() {
        Some(path) => (ctx.repo().repo_path(path), Some("explicit --converter-path".to_string())),
        None => (
            default_autoheckin_path(ctx.repo()),
            Some("repo-default AutoHeckin converter path".to_string()),
        ),
    };
    let game_root = discover_game_root();
    let game_root_reason = game_root
        .as_ref()
        .map(|_| "auto-detected DOOM Eternal install root".to_string());

    let manifest_exists = manifest_path.as_ref().filter(|path| path.exists()).cloned();

    RepoState {
        source_pack,
        source_pack_reason,
        source_set,
        source_set_reason,
        target_set,
        target_set_reason,
        editable_root,
        editable_root_reason,
        manifest_path: manifest_exists,
        manifest_reason: manifest_path
            .as_ref()
            .filter(|path| path.exists())
            .and(manifest_reason),
        manifest_source_set,
        manifest_target_set,
        output_mod_root,
        zip_output,
        converter_path: converter_path.clone(),
        converter_available: converter_path.is_file(),
        converter_reason,
        game_root,
        game_root_reason,
    }
}

pub fn detect_export_source_set(export_root: &Path) -> Option<String> {
    if !export_root.exists() {
        return None;
    }

    let mut sets = std::collections::BTreeSet::new();
    for entry in walkdir::WalkDir::new(export_root).into_iter().filter_map(|entry| entry.ok()) {
        let path_text = entry.path().to_string_lossy();
        for set_name in find_set_tokens(&path_text) {
            sets.insert(set_name);
        }
    }

    if sets.len() == 1 {
        sets.into_iter().next()
    } else {
        None
    }
}

fn detect_source_pack(ctx: &AppContext) -> (Option<PathBuf>, Option<String>) {
    let candidates = discover_local_source_candidates(ctx.repo());
    if candidates.is_empty() {
        return (None, None);
    }
    let mut ranked = candidates;
    ranked.sort_by(|left, right| {
        score_source_candidate(right)
            .cmp(&score_source_candidate(left))
            .then_with(|| left.to_string_lossy().cmp(&right.to_string_lossy()))
    });
    (
        ranked.first().cloned(),
        Some("best local source-pack candidate".to_string()),
    )
}

fn infer_target_set(
    explicit_target_set: Option<&str>,
    manifest: Option<&ManifestCandidate>,
    output_mod_root: &Path,
    source_set: Option<&str>,
) -> (Option<String>, Option<String>) {
    if let Some(target_set) = explicit_target_set.and_then(normalize_set_name) {
        return (Some(target_set), Some("explicit --target-set".to_string()));
    }

    if let Some(manifest) = manifest {
        if let Some(target_set) = manifest.target_set.clone() {
            return (
                Some(target_set),
                Some(format!("latest editable manifest {}", manifest.path.display())),
            );
        }
    }

    let editable_sets = detect_editable_sets(output_mod_root);
    if editable_sets.len() == 1 {
        return (
            editable_sets.first().cloned(),
            Some(format!(
                "editable output folder under {}",
                output_mod_root.join("editable").display()
            )),
        );
    }

    if let Some((set_name, reason)) = detect_build_editable_root_set() {
        return (Some(set_name), Some(reason));
    }

    if let Some(source_set) = source_set {
        return (
            normalize_set_name(source_set),
            Some("source pack fallback".to_string()),
        );
    }

    (None, None)
}

fn infer_editable_root(
    ctx: &AppContext,
    explicit_editable_root: Option<&Path>,
    target_set: Option<&str>,
    manifest: Option<&ManifestCandidate>,
) -> (PathBuf, String) {
    if let Some(path) = explicit_editable_root {
        return (ctx.repo().repo_path(path), "explicit --editable-root".to_string());
    }

    if let Some(manifest) = manifest {
        if manifest.target_set.as_deref() == target_set {
            let parent = manifest
                .path
                .parent()
                .map(Path::to_path_buf)
                .unwrap_or_else(|| manifest.path.clone());
            return (parent.clone(), format!("manifest parent {}", parent.display()));
        }
    }

    if let Some(target_set) = target_set.and_then(normalize_set_name) {
        return (
            ctx.repo()
                .root()
                .join("build")
                .join(format!("rtx-editable-source-{target_set}")),
            "derived from target set".to_string(),
        );
    }

    (
        ctx.repo().repo_path(DEFAULT_EDITABLE_ROOT),
        "repo default editable root".to_string(),
    )
}

fn infer_manifest_path(
    ctx: &AppContext,
    explicit_manifest: Option<&Path>,
    target_set: Option<&str>,
) -> (Option<PathBuf>, Option<String>, Option<String>, Option<String>) {
    if let Some(path) = explicit_manifest {
        let manifest_path = ctx.repo().repo_path(path);
        let candidate = manifest_path.is_file().then(|| load_manifest_candidate(&manifest_path)).flatten();
        return (
            Some(manifest_path),
            Some("explicit --manifest".to_string()),
            candidate.as_ref().and_then(|candidate| candidate.source_set.clone()),
            candidate.as_ref().and_then(|candidate| candidate.target_set.clone()),
        );
    }

    let candidate = choose_manifest_candidate(ctx, target_set);
    if let Some(candidate) = candidate {
        return (
            Some(candidate.path.clone()),
            Some(format!(
                "latest matching editable manifest {}",
                candidate.path.display()
            )),
            candidate.source_set.clone(),
            candidate.target_set.clone(),
        );
    }

    let normalized_target = target_set.and_then(normalize_set_name);
    if let Some(target_set) = normalized_target {
        let path = ctx
            .repo()
            .root()
            .join("build")
            .join(format!("rtx-editable-source-{target_set}"))
            .join(DEFAULT_MANIFEST_NAME);
        return (path.exists().then_some(path), None, None, None);
    }

    (None, None, None, None)
}

fn choose_manifest_candidate(ctx: &AppContext, target_set: Option<&str>) -> Option<ManifestCandidate> {
    let manifests = iter_manifest_candidates(ctx);
    let normalized_target = target_set.and_then(normalize_set_name);
    if let Some(normalized_target) = normalized_target {
        for manifest in &manifests {
            if manifest.target_set.as_deref() == Some(normalized_target.as_str()) {
                return Some(manifest.clone());
            }
        }
    }
    manifests.first().cloned()
}

fn iter_manifest_candidates(ctx: &AppContext) -> Vec<ManifestCandidate> {
    let build_root = ctx.repo().root().join("build");
    let mut candidates = Vec::new();
    let entries = match fs::read_dir(&build_root) {
        Ok(entries) => entries,
        Err(_) => return candidates,
    };
    for entry in entries.filter_map(|entry| entry.ok()) {
        let path = entry.path();
        if !path.is_dir() {
            continue;
        }
        let Some(name) = path.file_name().map(|value| value.to_string_lossy().to_string()) else {
            continue;
        };
        if !name.starts_with("rtx-editable-source") {
            continue;
        }
        let manifest_path = path.join(DEFAULT_MANIFEST_NAME);
        if let Some(candidate) = load_manifest_candidate(&manifest_path) {
            candidates.push(candidate);
        }
    }
    candidates.sort_by(|left, right| {
        right
            .modified_at
            .cmp(&left.modified_at)
            .then_with(|| left.path.to_string_lossy().cmp(&right.path.to_string_lossy()))
    });
    candidates
}

fn load_manifest_candidate(path: &Path) -> Option<ManifestCandidate> {
    let payload = fs::read_to_string(path)
        .ok()
        .and_then(|text| serde_json::from_str::<RequiredEditableManifest>(&text).ok())?;
    let modified_at = path
        .metadata()
        .and_then(|metadata| metadata.modified())
        .unwrap_or(SystemTime::UNIX_EPOCH);
    Some(ManifestCandidate {
        path: path.to_path_buf(),
        source_set: normalize_set_name(payload.source_set),
        target_set: normalize_set_name(payload.target_set),
        modified_at,
    })
}

fn detect_editable_sets(editable_root: &Path) -> Vec<String> {
    let character_root = editable_root
        .join("editable")
        .join("models")
        .join("customization")
        .join("characters")
        .join("doomslayer");
    let entries = match fs::read_dir(character_root) {
        Ok(entries) => entries,
        Err(_) => return Vec::new(),
    };
    let mut sets = entries
        .filter_map(|entry| entry.ok())
        .map(|entry| entry.path())
        .filter(|path| path.is_dir())
        .filter_map(|path| {
            path.file_name()
                .and_then(|value| parse_set_token(value.to_string_lossy()))
        })
        .collect::<Vec<_>>();
    sets.sort();
    sets
}

fn detect_build_editable_root_set() -> Option<(String, String)> {
    let repo_root = PathBuf::from(env!("CARGO_MANIFEST_DIR"))
        .parent()
        .and_then(Path::parent)
        .map(Path::to_path_buf)?;
    let entries = fs::read_dir(repo_root.join("build")).ok()?;
    let mut candidates = entries
        .filter_map(|entry| entry.ok())
        .map(|entry| entry.path())
        .filter(|path| path.is_dir())
        .filter_map(|path| {
            let name = path.file_name()?.to_string_lossy();
            let set_name = parse_set_token(name.strip_prefix("rtx-editable-source-")?)?;
            let modified_at = path
                .metadata()
                .and_then(|metadata| metadata.modified())
                .unwrap_or(SystemTime::UNIX_EPOCH);
            Some((modified_at, set_name, path))
        })
        .collect::<Vec<_>>();
    candidates.sort_by(|left, right| {
        right
            .0
            .cmp(&left.0)
            .then_with(|| left.2.to_string_lossy().cmp(&right.2.to_string_lossy()))
    });
    candidates
        .into_iter()
        .next()
        .map(|(_, set_name, path)| (set_name, format!("latest editable-root folder {}", path.display())))
}

fn score_source_candidate(path: &Path) -> u32 {
    let mut score = 0;
    let name = path
        .file_name()
        .map(|value| value.to_string_lossy().to_ascii_lowercase())
        .unwrap_or_default();
    if name == "rtx-slayer" {
        score += 100;
    }
    if name.contains("rtx") {
        score += 20;
    }
    if name.contains("slayer") {
        score += 20;
    }
    if path.join("EternalMod.json").is_file() {
        score += 10;
    }
    if path
        .join("warehouse")
        .join("models")
        .join("customization")
        .join("characters")
        .join("doomslayer")
        .is_dir()
    {
        score += 10;
    }
    score
}