mirror of
https://github.com/NixOS/nix.git
synced 2025-11-16 15:32:43 +01:00
55 lines
2.1 KiB
C++
55 lines
2.1 KiB
C++
#include <regex>
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#include <optional>
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#include <string>
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#include "nix/flake/url-name.hh"
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#include "nix/util/strings.hh"
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#include "nix/util/url.hh"
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namespace nix {
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static const std::string attributeNamePattern("[a-zA-Z0-9_-]+");
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static const std::regex
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lastAttributeRegex("^((?:" + attributeNamePattern + "\\.)*)(" + attributeNamePattern + ")(\\^.*)?$");
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static const std::string pathSegmentPattern("[a-zA-Z0-9_-]+");
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static const std::regex lastPathSegmentRegex(".*/(" + pathSegmentPattern + ")");
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static const std::regex secondPathSegmentRegex("(?:" + pathSegmentPattern + ")/(" + pathSegmentPattern + ")(?:/.*)?");
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static const std::regex gitProviderRegex("github|gitlab|sourcehut");
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static const std::regex gitSchemeRegex("git($|\\+.*)");
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std::optional<std::string> getNameFromURL(const ParsedURL & url)
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{
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std::smatch match;
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/* If there is a dir= argument, use its value */
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if (url.query.count("dir") > 0)
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return url.query.at("dir");
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/* If the fragment isn't a "default" and contains two attribute elements, use the last one */
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if (std::regex_match(url.fragment, match, lastAttributeRegex) && match.str(1) != "defaultPackage."
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&& match.str(2) != "default") {
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return match.str(2);
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}
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/* This is not right, because special chars like slashes within the
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path fragments should be percent encoded, but I don't think any
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of the regexes above care. */
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auto path = concatStringsSep("/", url.path);
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/* If this is a github/gitlab/sourcehut flake, use the repo name */
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if (std::regex_match(url.scheme, gitProviderRegex) && std::regex_match(path, match, secondPathSegmentRegex))
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return match.str(1);
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/* If it is a regular git flake, use the directory name */
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if (std::regex_match(url.scheme, gitSchemeRegex) && std::regex_match(path, match, lastPathSegmentRegex))
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return match.str(1);
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/* If there is no fragment, take the last element of the path */
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if (std::regex_match(path, match, lastPathSegmentRegex))
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return match.str(1);
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/* If even that didn't work, the URL does not contain enough info to determine a useful name */
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return {};
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}
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} // namespace nix
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