git-cat-file/lib/pack.js

Pure JavaScript `git cat-file -p` for node.js

"use strict";
/**
 * https://github.com/kawanet/git-cat-file
 */
Object.defineProperty(exports, "__esModule", { value: true });
exports.Pack = void 0;
const fs_1 = require("fs");
const pack_idx_1 = require("./pack-idx");
const pack_obj_1 = require("./pack-obj");
const cache_1 = require("./cache");
class Pack {
    constructor(path) {
        this.path = path;
        this.getIndex = (0, cache_1.longCache)(() => (0, pack_idx_1.readPackIndex)(this.path));
        this.getList = (0, cache_1.longCache)(() => this.getIndex().then(index => Object.keys(index).sort()));
        //
    }
    async findAll(object_id) {
        const list = await this.getList();
        const index = {};
        const { length } = object_id;
        for (const oid of await list) {
            if (oid.slice(0, length) === object_id) {
                index[oid] = 1;
            }
        }
        return Object.keys(index);
    }
    async getObject(object_id, store) {
        const index = await this.getIndex();
        const offset = index[object_id];
        if (!offset)
            return;
        // console.warn(`open: ${this.path}`);
        const fh = await fs_1.promises.open(this.path, "r");
        const obj = await (0, pack_obj_1.readPackedObject)(fh, offset, store);
        await fh.close();
        const { type, data } = obj;
        return { oid: object_id, type, data };
    }
}
exports.Pack = Pack;