2016-02-09 15:07:48 -05:00
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#pragma once
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#include <iostream>
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#include <map>
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#include <memory>
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2020-08-17 11:44:52 -04:00
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#include <nlohmann/json_fwd.hpp>
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2016-02-09 15:07:48 -05:00
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#include "util.hh"
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namespace nix {
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enum HashType : char;
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2021-09-13 08:41:28 -04:00
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class MultiCommand;
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2016-02-09 15:07:48 -05:00
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class Args
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{
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public:
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/* Parse the command line, throwing a UsageError if something goes
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wrong. */
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void parseCmdline(const Strings & cmdline);
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2020-08-20 06:21:46 -04:00
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/* Return a short one-line description of the command. */
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2016-02-09 15:07:48 -05:00
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virtual std::string description() { return ""; }
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2020-12-07 07:04:24 -05:00
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/* Return documentation about this command, in Markdown format. */
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virtual std::string doc() { return ""; }
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2016-02-09 15:07:48 -05:00
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protected:
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2017-08-29 08:28:57 -04:00
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static const size_t ArityAny = std::numeric_limits<size_t>::max();
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2020-05-11 09:46:18 -04:00
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struct Handler
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{
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std::function<void(std::vector<std::string>)> fun;
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size_t arity;
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Handler() {}
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Handler(std::function<void(std::vector<std::string>)> && fun)
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: fun(std::move(fun))
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, arity(ArityAny)
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{ }
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Handler(std::function<void()> && handler)
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: fun([handler{std::move(handler)}](std::vector<std::string>) { handler(); })
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, arity(0)
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{ }
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Handler(std::function<void(std::string)> && handler)
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: fun([handler{std::move(handler)}](std::vector<std::string> ss) {
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handler(std::move(ss[0]));
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})
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, arity(1)
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{ }
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Handler(std::function<void(std::string, std::string)> && handler)
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: fun([handler{std::move(handler)}](std::vector<std::string> ss) {
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handler(std::move(ss[0]), std::move(ss[1]));
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})
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, arity(2)
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{ }
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Handler(std::vector<std::string> * dest)
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: fun([=](std::vector<std::string> ss) { *dest = ss; })
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, arity(ArityAny)
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{ }
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2021-01-08 04:44:55 -05:00
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Handler(std::string * dest)
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: fun([=](std::vector<std::string> ss) { *dest = ss[0]; })
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, arity(1)
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{ }
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Handler(std::optional<std::string> * dest)
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2020-05-11 09:46:18 -04:00
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: fun([=](std::vector<std::string> ss) { *dest = ss[0]; })
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, arity(1)
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{ }
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template<class T>
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Handler(T * dest, const T & val)
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: fun([=](std::vector<std::string> ss) { *dest = val; })
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, arity(0)
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{ }
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2021-01-08 04:44:55 -05:00
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template<class I>
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Handler(I * dest)
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: fun([=](std::vector<std::string> ss) {
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*dest = string2IntWithUnitPrefix<I>(ss[0]);
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})
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, arity(1)
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{ }
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2021-09-14 13:05:28 -04:00
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template<class I>
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Handler(std::optional<I> * dest)
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: fun([=](std::vector<std::string> ss) {
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*dest = string2IntWithUnitPrefix<I>(ss[0]);
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})
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, arity(1)
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{ }
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2020-05-11 09:46:18 -04:00
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};
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2021-01-25 13:03:13 -05:00
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/* Options. */
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2016-02-09 15:07:48 -05:00
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struct Flag
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{
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typedef std::shared_ptr<Flag> ptr;
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2020-05-04 16:40:19 -04:00
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2017-06-07 12:41:20 -04:00
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std::string longName;
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2021-02-07 14:44:56 -05:00
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std::set<std::string> aliases;
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char shortName = 0;
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std::string description;
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2017-06-07 12:41:20 -04:00
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std::string category;
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2020-05-04 16:40:19 -04:00
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Strings labels;
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Handler handler;
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2020-05-10 15:35:07 -04:00
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std::function<void(size_t, std::string_view)> completer;
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2020-05-04 16:40:19 -04:00
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static Flag mkHashTypeFlag(std::string && longName, HashType * ht);
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2020-06-02 14:25:32 -04:00
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static Flag mkHashTypeOptFlag(std::string && longName, std::optional<HashType> * oht);
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2016-02-09 15:07:48 -05:00
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};
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2017-06-07 12:41:20 -04:00
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std::map<std::string, Flag::ptr> longFlags;
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std::map<char, Flag::ptr> shortFlags;
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2016-02-09 15:07:48 -05:00
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virtual bool processFlag(Strings::iterator & pos, Strings::iterator end);
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/* Positional arguments. */
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struct ExpectedArg
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{
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std::string label;
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2020-05-10 15:35:07 -04:00
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bool optional = false;
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2020-05-11 09:46:18 -04:00
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Handler handler;
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std::function<void(size_t, std::string_view)> completer;
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2016-02-09 15:07:48 -05:00
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};
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std::list<ExpectedArg> expectedArgs;
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virtual bool processArgs(const Strings & args, bool finish);
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2020-12-03 16:45:44 -05:00
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virtual Strings::iterator rewriteArgs(Strings & args, Strings::iterator pos)
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{ return pos; }
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2017-06-07 12:41:20 -04:00
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std::set<std::string> hiddenCategories;
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2021-01-28 09:37:43 -05:00
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/* Called after all command line flags before the first non-flag
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argument (if any) have been processed. */
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virtual void initialFlagsProcessed() {}
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2016-02-09 15:07:48 -05:00
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public:
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2020-05-04 16:40:19 -04:00
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void addFlag(Flag && flag);
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2017-06-07 12:41:20 -04:00
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2021-02-26 08:55:54 -05:00
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void removeFlag(const std::string & longName);
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2020-05-11 09:46:18 -04:00
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void expectArgs(ExpectedArg && arg)
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{
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expectedArgs.emplace_back(std::move(arg));
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}
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2016-02-09 15:07:48 -05:00
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/* Expect a string argument. */
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void expectArg(const std::string & label, std::string * dest, bool optional = false)
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{
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expectArgs({
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.label = label,
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.optional = optional,
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2020-05-11 09:46:18 -04:00
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.handler = {dest}
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});
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2016-02-09 15:07:48 -05:00
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}
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/* Expect 0 or more arguments. */
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2017-10-24 06:45:11 -04:00
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void expectArgs(const std::string & label, std::vector<std::string> * dest)
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{
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2020-05-11 09:46:18 -04:00
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expectArgs({
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.label = label,
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.handler = {dest}
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});
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2016-02-09 15:07:48 -05:00
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}
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2016-02-09 15:28:29 -05:00
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2020-08-17 11:44:52 -04:00
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virtual nlohmann::json toJSON();
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2016-02-09 15:28:29 -05:00
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friend class MultiCommand;
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2021-09-13 08:41:28 -04:00
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MultiCommand * parent = nullptr;
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2016-02-09 15:07:48 -05:00
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};
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2018-11-22 10:03:31 -05:00
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/* A command is an argument parser that can be executed by calling its
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run() method. */
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2021-09-13 08:41:28 -04:00
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struct Command : virtual public Args
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2018-11-22 10:03:31 -05:00
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{
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2019-06-19 17:37:40 -04:00
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friend class MultiCommand;
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2018-11-22 10:03:31 -05:00
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virtual ~Command() { }
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2019-06-18 10:01:35 -04:00
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2018-11-22 10:03:31 -05:00
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virtual void prepare() { };
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virtual void run() = 0;
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2020-05-05 09:18:23 -04:00
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typedef int Category;
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static constexpr Category catDefault = 0;
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virtual Category category() { return catDefault; }
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2018-11-22 10:03:31 -05:00
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};
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2019-06-18 10:01:35 -04:00
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typedef std::map<std::string, std::function<ref<Command>()>> Commands;
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2018-11-22 10:03:31 -05:00
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/* An argument parser that supports multiple subcommands,
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i.e. ‘<command> <subcommand>’. */
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2021-09-13 08:41:28 -04:00
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class MultiCommand : virtual public Args
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2018-11-22 10:03:31 -05:00
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{
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public:
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Commands commands;
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2020-05-05 09:18:23 -04:00
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std::map<Command::Category, std::string> categories;
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// Selected command, if any.
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std::optional<std::pair<std::string, ref<Command>>> command;
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2018-11-22 10:03:31 -05:00
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2019-06-18 10:01:35 -04:00
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MultiCommand(const Commands & commands);
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2018-11-22 10:03:31 -05:00
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bool processFlag(Strings::iterator & pos, Strings::iterator end) override;
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bool processArgs(const Strings & args, bool finish) override;
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2020-08-17 11:44:52 -04:00
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nlohmann::json toJSON() override;
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2018-11-22 10:03:31 -05:00
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};
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2016-02-09 15:07:48 -05:00
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Strings argvToStrings(int argc, char * * argv);
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2020-10-09 03:39:51 -04:00
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struct Completion {
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std::string completion;
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std::string description;
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bool operator<(const Completion & other) const;
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};
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class Completions : public std::set<Completion> {
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public:
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void add(std::string completion, std::string description = "");
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};
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extern std::shared_ptr<Completions> completions;
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2021-12-22 06:37:59 -05:00
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enum CompletionType {
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ctNormal,
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ctFilenames,
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ctAttrs
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};
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extern CompletionType completionType;
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2020-05-10 14:32:21 -04:00
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std::optional<std::string> needsCompletion(std::string_view s);
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2020-05-11 09:46:18 -04:00
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void completePath(size_t, std::string_view prefix);
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2020-05-10 15:35:07 -04:00
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2020-05-11 16:04:13 -04:00
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void completeDir(size_t, std::string_view prefix);
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2016-02-09 15:07:48 -05:00
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}
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