Introduce support for user-provided extensions

This change introduces support for discovering and executing
user-provided extensions to the program. Extensions are useful for
allowing users to provide additional functionality on top of the
nitrocli proper. Implementation wise we stick to an approach similar to
git or cargo subcommands in nature: we search the directories listed in
the PATH environment variable for a file that starts with "nitrocli-",
followed by the extension name. This file is then executed. It is
assumed that the extension recognizes (or at least not prohibits) the
following arguments: --nitrocli (providing the path to the nitrocli
binary), --model (with the model passed to the main program), and
--verbosity (the verbosity level).

1 files changed, 1 insertions, 10 deletions

diff --git a/src/redefine.rs b/src/redefine.rs
index 10fb631..fe15765 100644
--- a/src/redefine.rs
+++ b/src/redefine.rs
@@ -1,6 +1,6 @@
 // redefine.rs
 
-// Copyright (C) 2019 The Nitrocli Developers
+// Copyright (C) 2019-2020 The Nitrocli Developers
 // SPDX-License-Identifier: GPL-3.0-or-later
 
 // A replacement of the standard println!() macro that requires an
@@ -19,12 +19,3 @@ macro_rules! print {
     write!($ctx.stdout, $($arg)*)
   };
 }
-
-macro_rules! eprintln {
-  ($ctx:expr) => {
-    writeln!($ctx.stderr, "")
-  };
-  ($ctx:expr, $($arg:tt)*) => {
-    writeln!($ctx.stderr, $($arg)*)
-  };
-}