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authorEelco Dolstra <eelco.dolstra@logicblox.com>2016-02-09T20·28+0100
committerEelco Dolstra <eelco.dolstra@logicblox.com>2016-02-09T20·28+0100
commitcd2196b08981a96cf607ad4a8f2f0dfa8cdf2add (patch)
treeb8f213b8790dc55812dae9fd1403bb352ccad0e2 /src/nix/command.hh
parent0db9e6cd1af299f7d65e0b99019f0ccdbb1aaf3f (diff)
Start of new Nix command-line interface
Diffstat (limited to 'src/nix/command.hh')
-rw-r--r--src/nix/command.hh59
1 files changed, 59 insertions, 0 deletions
diff --git a/src/nix/command.hh b/src/nix/command.hh
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+++ b/src/nix/command.hh
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+#pragma once
+
+#include "args.hh"
+
+namespace nix {
+
+/* A command is an argument parser that can be executed by calling its
+   run() method. */
+struct Command : virtual Args
+{
+    virtual std::string name() = 0;
+    virtual void prepare() { };
+    virtual void run() = 0;
+};
+
+class Store;
+
+/* A command that require a Nix store. */
+struct StoreCommand : virtual Command
+{
+    bool reserveSpace;
+    StoreCommand(bool reserveSpace = true)
+        : reserveSpace(reserveSpace) { };
+    void run() override;
+    virtual void run(ref<Store>) = 0;
+};
+
+typedef std::map<std::string, ref<Command>> Commands;
+
+/* An argument parser that supports multiple subcommands,
+   i.e. ‘<command> <subcommand>’. */
+struct MultiCommand : virtual Args
+{
+    Commands commands;
+
+    std::shared_ptr<Command> command;
+
+    MultiCommand(const Commands & 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
+{
+    static Commands * commands;
+
+    RegisterCommand(ref<Command> command)
+    {
+        if (!commands) commands = new Commands;
+        commands->emplace(command->name(), command);
+    }
+};
+
+}