Save alias (#1852)

* figuring out error with lines

* make progress in printing of block

* support for external commands; fix some tiny bugs in formatting

* basic printing of block; going to experiment with bubbling raw input to the command itself to avoid potential edge cases

* remove fmt::Display impls for hir structs; bubbled raw_input to command args

* compiling checkpoint :)

* process raw input alias to remove save flag; do duplicates stored

* fix warnings; run clippy

* removed tmux log file

* fix bug in looking for same alias; changed unwraps to safe unwraps

crates/nu-cli/src/commands/command.rs

@@ -57,6 +57,7 @@ pub struct CommandArgs {
     pub shell_manager: ShellManager,
     pub call_info: UnevaluatedCallInfo,
     pub input: InputStream,
+    pub raw_input: String,
 }
 
 #[derive(Getters, Clone)]
@@ -76,6 +77,7 @@ impl RawCommandArgs {
             shell_manager: self.shell_manager,
             call_info: self.call_info,
             input: input.into(),
+            raw_input: String::default(),
         }
     }
 }
@@ -151,6 +153,7 @@ pub struct RunnableContext {
     pub ctrl_c: Arc<AtomicBool>,
     pub registry: CommandRegistry,
     pub name: Tag,
+    pub raw_input: String,
 }
 
 impl RunnableContext {
@@ -384,6 +387,7 @@ impl WholeStreamCommand for FnFilterCommand {
             shell_manager,
             call_info,
             mut input,
+            ..
         } = args;
 
         let host: Arc<parking_lot::Mutex<dyn Host>> = host.clone();