75 lines
2.3 KiB
Lua
75 lines
2.3 KiB
Lua
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--- Core functions for querying manifest files.
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-- This module requires no specific 'fs' functionality.
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module("luarocks.manif_core", package.seeall)
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local persist = require("luarocks.persist")
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local type_check = require("luarocks.type_check")
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local dir = require("luarocks.dir")
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local util = require("luarocks.util")
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local cfg = require("luarocks.cfg")
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manifest_cache = {}
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--- Back-end function that actually loads the manifest
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-- and stores it in the manifest cache.
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-- @param file string: The local filename of the manifest file.
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-- @param repo_url string: The repository identifier.
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function manifest_loader(file, repo_url, quick)
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local manifest = persist.load_into_table(file)
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if not manifest then
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return nil, "Failed loading manifest for "..repo_url
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end
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if not quick then
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local ok, err = type_check.type_check_manifest(manifest)
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if not ok then
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return nil, "Error checking manifest: "..err
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end
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end
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manifest_cache[repo_url] = manifest
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return manifest
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end
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--- Load a local manifest describing a repository.
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-- All functions that use manifest tables assume they were obtained
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-- through either this function or load_manifest.
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-- @param repo_url string: URL or pathname for the repository.
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-- @return table or (nil, string): A table representing the manifest,
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-- or nil followed by an error message.
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function load_local_manifest(repo_url)
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assert(type(repo_url) == "string")
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if manifest_cache[repo_url] then
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return manifest_cache[repo_url]
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end
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local pathname = dir.path(repo_url, "manifest")
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return manifest_loader(pathname, repo_url, true)
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end
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--- Get all versions of a package listed in a manifest file.
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-- @param name string: a package name.
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-- @param manifest table or nil: a manifest table; if not given, the
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-- default local manifest table is used.
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-- @return table: An array of strings listing installed
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-- versions of a package.
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function get_versions(name, manifest)
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assert(type(name) == "string")
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assert(type(manifest) == "table" or not manifest)
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if not manifest then
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manifest = load_local_manifest(cfg.rocks_dir)
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if not manifest then
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return {}
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end
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end
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local item = manifest.repository[name]
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if item then
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return util.keys(item)
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end
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return {}
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end
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