From f964f428fe6975e06a273e43c3266928a407454f Mon Sep 17 00:00:00 2001
From: Eelco Dolstra <edolstra@gmail.com>
Date: Thu, 22 Nov 2018 16:03:31 +0100
Subject: Move Command and MultiCommand to libutil

(cherry picked from commit f70434b1fbbdb0e188718f0c55a8156a7aa08744)
---
 src/nix/command.cc | 74 ------------------------------------------------------
 src/nix/command.hh | 43 -------------------------------
 src/nix/main.cc    |  5 ++++
 3 files changed, 5 insertions(+), 117 deletions(-)

(limited to 'src/nix')

diff --git a/src/nix/command.cc b/src/nix/command.cc
index a40a113db..99848fe73 100644
--- a/src/nix/command.cc
+++ b/src/nix/command.cc
@@ -7,80 +7,6 @@ namespace nix {
 
 std::vector<ref<Command>> * RegisterCommand::commands = 0;
 
-void Command::printHelp(const string & programName, std::ostream & out)
-{
-    Args::printHelp(programName, out);
-
-    auto exs = examples();
-    if (!exs.empty()) {
-        out << "\n";
-        out << "Examples:\n";
-        for (auto & ex : exs)
-            out << "\n"
-                << "  " << ex.description << "\n" // FIXME: wrap
-                << "  $ " << ex.command << "\n";
-    }
-}
-
-MultiCommand::MultiCommand(const std::vector<ref<Command>> & _commands)
-{
-    for (auto & command : _commands)
-        commands.emplace(command->name(), command);
-
-    expectedArgs.push_back(ExpectedArg{"command", 1, true, [=](std::vector<std::string> ss) {
-        assert(!command);
-        auto i = commands.find(ss[0]);
-        if (i == commands.end())
-            throw UsageError("'%s' is not a recognised command", ss[0]);
-        command = i->second;
-    }});
-}
-
-void MultiCommand::printHelp(const string & programName, std::ostream & out)
-{
-    if (command) {
-        command->printHelp(programName + " " + command->name(), out);
-        return;
-    }
-
-    out << "Usage: " << programName << " <COMMAND> <FLAGS>... <ARGS>...\n";
-
-    out << "\n";
-    out << "Common flags:\n";
-    printFlags(out);
-
-    out << "\n";
-    out << "Available commands:\n";
-
-    Table2 table;
-    for (auto & command : commands) {
-        auto descr = command.second->description();
-        if (!descr.empty())
-            table.push_back(std::make_pair(command.second->name(), descr));
-    }
-    printTable(out, table);
-
-#if 0
-    out << "\n";
-    out << "For full documentation, run 'man " << programName << "' or 'man " << programName << "-<COMMAND>'.\n";
-#endif
-}
-
-bool MultiCommand::processFlag(Strings::iterator & pos, Strings::iterator end)
-{
-    if (Args::processFlag(pos, end)) return true;
-    if (command && command->processFlag(pos, end)) return true;
-    return false;
-}
-
-bool MultiCommand::processArgs(const Strings & args, bool finish)
-{
-    if (command)
-        return command->processArgs(args, finish);
-    else
-        return Args::processArgs(args, finish);
-}
-
 StoreCommand::StoreCommand()
 {
 }
diff --git a/src/nix/command.hh b/src/nix/command.hh
index be56f8992..aa34301d9 100644
--- a/src/nix/command.hh
+++ b/src/nix/command.hh
@@ -11,29 +11,6 @@ struct Value;
 class Bindings;
 class EvalState;
 struct Pos;
-
-/* A command is an argument parser that can be executed by calling its
-   run() method. */
-struct Command : virtual Args
-{
-    virtual ~Command() { }
-    virtual std::string name() = 0;
-    virtual void prepare() { };
-    virtual void run() = 0;
-
-    struct Example
-    {
-        std::string description;
-        std::string command;
-    };
-
-    typedef std::list<Example> Examples;
-
-    virtual Examples examples() { return Examples(); }
-
-    void printHelp(const string & programName, std::ostream & out) override;
-};
-
 class Store;
 
 /* A command that requires a Nix store. */
@@ -171,26 +148,6 @@ struct StorePathCommand : public InstallablesCommand
     void run(ref<Store> store) override;
 };
 
-typedef std::map<std::string, ref<Command>> Commands;
-
-/* An argument parser that supports multiple subcommands,
-   i.e. ‘<command> <subcommand>’. */
-class MultiCommand : virtual Args
-{
-public:
-    Commands commands;
-
-    std::shared_ptr<Command> command;
-
-    MultiCommand(const std::vector<ref<Command>> & commands);
-
-    void printHelp(const string & programName, std::ostream & out) override;
-
-    bool processFlag(Strings::iterator & pos, Strings::iterator end) override;
-
-    bool processArgs(const Strings & args, bool finish) override;
-};
-
 /* A helper class for registering commands globally. */
 struct RegisterCommand
 {
diff --git a/src/nix/main.cc b/src/nix/main.cc
index d5cba7fb9..dcf351cf4 100644
--- a/src/nix/main.cc
+++ b/src/nix/main.cc
@@ -107,6 +107,11 @@ struct NixArgs : virtual MultiCommand, virtual MixCommonArgs
     void printHelp(const string & programName, std::ostream & out)
     {
         MultiCommand::printHelp(programName, out);
+
+#if 0
+        out << "\nFor full documentation, run 'man " << programName << "' or 'man " << programName << "-<COMMAND>'.\n";
+#endif
+
         std::cout << "\nNote: this program is EXPERIMENTAL and subject to change.\n";
     }
 
-- 
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