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// SPDX-FileCopyrightText: 2026 Progmasoft <support@progmasoft.com>
// SPDX-License-Identifier: MPL-2.0 WITH AdditionRef-Progmasoft-Exception-2.0
#include <array>
#include <fmt/format.h>
#include <utility>
#include "Progmasoft/Tazelish/CommandLine.hpp"
namespace Progmasoft::Tazelish
{
namespace
{
constexpr std::array<std::pair<std::string_view, Topic>, 5> kTopics
= { {
{ "install", Topic::kInstall },
{ "use", Topic::kUse },
{ "default", Topic::kDefault },
{ "self", Topic::kSelf },
{ "help", Topic::kHelp },
} };
constexpr std::string_view kVersionForms
= "MAJOR.SEMIMAJOR.MINOR.PATCH, unstable, nightly, "
"YYYY-MM-DD-unstable or "
"YYYY-MM-DD-nightly";
Rejection
Reject(std::string message)
{
return Rejection{ std::move(message) };
}
// The one version of a command, written as the argument [text].
std::variant<Version, Rejection>
ReadVersion(std::string_view command, std::string_view text)
{
if (auto version = ParseVersion(text))
{
return *version;
}
return Reject(
fmt::format("'{}' is not a version; tazelish {} takes {}",
text,
command,
kVersionForms));
}
// `install <version>`.
ParseResult
ParseInstall(const std::vector<std::string_view> &rest)
{
if (rest.size() != 1)
{
return Reject("tazelish install takes one version, such as "
"tazelish install 0.4.0.3");
}
auto version = ReadVersion("install", rest.front());
if (auto *rejection = std::get_if<Rejection>(&version))
{
return std::move(*rejection);
}
return Command{ Install{ std::get<Version>(version) } };
}
// `use|default [--force] <version>`, the flag before or after the
// version.
template<typename Writing>
ParseResult
ParseWriting(std::string_view command,
const std::vector<std::string_view> &rest)
{
bool force = false;
std::optional<std::string_view> text;
for (const std::string_view argument : rest)
{
if (argument == "--force")
{
if (force)
{
return Reject(fmt::format(
"--force is written twice in tazelish {}",
command));
}
force = true;
}
else if (argument.size() > 1 && argument.front() == '-')
{
return Reject(fmt::format("'{}' is not an option of "
"tazelish {}; it takes --force",
argument,
command));
}
else if (text)
{
return Reject(
fmt::format("tazelish {} takes one version", command));
}
else
{
text = argument;
}
}
if (!text)
{
return Reject(fmt::format(
"tazelish {} takes a version, such as tazelish {} 0.4.0.3",
command,
command));
}
auto version = ReadVersion(command, *text);
if (auto *rejection = std::get_if<Rejection>(&version))
{
return std::move(*rejection);
}
return Command{ Writing{ std::get<Version>(version), force } };
}
// `self update|remove|purge`.
ParseResult
ParseSelf(const std::vector<std::string_view> &rest)
{
if (rest.size() == 1)
{
if (rest.front() == "update")
{
return Command{ Self{ SelfAction::kUpdate } };
}
if (rest.front() == "remove")
{
return Command{ Self{ SelfAction::kRemove } };
}
if (rest.front() == "purge")
{
return Command{ Self{ SelfAction::kPurge } };
}
}
return Reject("tazelish self takes one of update, remove or purge");
}
// `help [command]`.
ParseResult
ParseHelp(const std::vector<std::string_view> &rest)
{
if (rest.empty())
{
return Command{ Help{} };
}
if (rest.size() == 1)
{
for (const auto &[name, topic] : kTopics)
{
if (rest.front() == name)
{
return Command{ Help{ topic } };
}
}
return Reject(
fmt::format("'{}' is not a command of tazelish; write "
"tazelish help for the commands",
rest.front()));
}
return Reject("tazelish help takes at most one command");
}
} // namespace
ParseResult
ParseCommandLine(const std::vector<std::string_view> &arguments)
{
if (arguments.empty())
{
return Command{ Help{} };
}
const std::string_view command = arguments.front();
const std::vector<std::string_view> rest(arguments.begin() + 1,
arguments.end());
if (command == "install")
{
return ParseInstall(rest);
}
if (command == "use")
{
return ParseWriting<Use>(command, rest);
}
if (command == "default")
{
return ParseWriting<Default>(command, rest);
}
if (command == "self")
{
return ParseSelf(rest);
}
if (command == "help")
{
return ParseHelp(rest);
}
return Reject(fmt::format(
"'{}' is not a command of tazelish; write tazelish help for the "
"commands",
command));
}
std::string_view
TopicName(Topic topic)
{
for (const auto &[name, candidate] : kTopics)
{
if (candidate == topic)
{
return name;
}
}
return {};
}
} // namespace Progmasoft::Tazelish
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