Move store docs to 'nix help-stores'

Why not 'nix help stores'? Well, 'nix help <arg>' already means 'show
help on the "arg" subcommand'.

1 files changed, 31 insertions, 1 deletions

diff --git a/src/nix/main.cc b/src/nix/main.cc
index 6caca9c22..5981028f7 100644
--- a/src/nix/main.cc
+++ b/src/nix/main.cc
@@ -223,6 +223,14 @@ static void showHelp(std::vector<std::string> subcommand, NixArgs & toplevel)
     std::cout << renderMarkdownToTerminal(markdown) << "\n";
 }
 
+static NixArgs & getNixArgs(Command & cmd)
+{
+    assert(cmd.parent);
+    MultiCommand * toplevel = cmd.parent;
+    while (toplevel->parent) toplevel = toplevel->parent;
+    return dynamic_cast<NixArgs &>(*toplevel);
+}
+
 struct CmdHelp : Command
 {
     std::vector<std::string> subcommand;
@@ -252,12 +260,34 @@ struct CmdHelp : Command
         assert(parent);
         MultiCommand * toplevel = parent;
         while (toplevel->parent) toplevel = toplevel->parent;
-        showHelp(subcommand, dynamic_cast<NixArgs &>(*toplevel));
+        showHelp(subcommand, getNixArgs(*this));
     }
 };
 
 static auto rCmdHelp = registerCommand<CmdHelp>("help");
 
+struct CmdHelpStores : Command
+{
+    std::string description() override
+    {
+        return "show help about store types and their settings";
+    }
+
+    std::string doc() override
+    {
+        return
+          #include "help-stores.md"
+          ;
+    }
+
+    void run() override
+    {
+        showHelp({"help-stores"}, getNixArgs(*this));
+    }
+};
+
+static auto rCmdHelpStores = registerCommand<CmdHelpStores>("help-stores");
+
 void mainWrapped(int argc, char * * argv)
 {
     savedArgv = argv;