Prepare nu_commands for porting

crates/nu-command/src/lib.rs

@@ -1,44 +1,19 @@
-mod alias;
-mod benchmark;
-mod build_string;
-mod def;
+mod core_commands;
 mod default_context;
-mod do_;
-mod each;
-mod for_;
-mod git;
-mod git_checkout;
-mod if_;
-mod length;
-mod let_;
-mod let_env;
-mod lines;
-mod list_git_branches;
-mod ls;
-mod module;
-mod run_external;
-mod table;
-mod use_;
-mod where_;
+mod env;
+mod experimental;
+mod filesystem;
+mod filters;
+mod strings;
+mod system;
+mod viewers;
 
-pub use alias::Alias;
-pub use benchmark::Benchmark;
-pub use build_string::BuildString;
-pub use def::Def;
-pub use default_context::create_default_context;
-pub use do_::Do;
-pub use each::Each;
-pub use for_::For;
-pub use git::Git;
-pub use git_checkout::GitCheckout;
-pub use if_::If;
-pub use length::Length;
-pub use let_::Let;
-pub use let_env::LetEnv;
-pub use lines::Lines;
-pub use list_git_branches::ListGitBranches;
-pub use ls::Ls;
-pub use module::Module;
-pub use run_external::External;
-pub use table::Table;
-pub use use_::Use;
+pub use core_commands::*;
+pub use default_context::*;
+pub use env::*;
+pub use experimental::*;
+pub use filesystem::*;
+pub use filters::*;
+pub use strings::*;
+pub use system::*;
+pub use viewers::*;