Line buffer editor (#5381)

* allow line editing

* cargo fmt

Cargo.lock

@@ -3716,7 +3716,7 @@ dependencies = [
 [[package]]
 name = "reedline"
 version = "0.4.0"
-source = "git+https://github.com/nushell/reedline?branch=main#2e2bdc54621643e7bee5ba2e2d9bf28e757074e0"
+source = "git+https://github.com/nushell/reedline?branch=main#39c70136bb95b50104a57767fbfdde50d7654421"
 dependencies = [
  "chrono",
  "crossterm",

crates/nu-cli/src/repl.rs

@@ -161,6 +161,8 @@ pub fn evaluate_repl(
             }
         };
 
+        line_editor = line_editor.with_buffer_editor(config.buffer_editor.clone(), "nu".into());
+
         if config.sync_history_on_enter {
             if is_perf_true {
                 info!("sync history {}:{}:{}", file!(), line!(), column!());

crates/nu-protocol/src/config.rs

@@ -47,6 +47,7 @@ pub struct Config {
     pub menus: Vec<ParsedMenu>,
     pub rm_always_trash: bool,
     pub shell_integration: bool,
+    pub buffer_editor: String,
     pub disable_table_indexes: bool,
 }
 
@@ -74,6 +75,7 @@ impl Default for Config {
             menus: Vec::new(),
             rm_always_trash: false,
             shell_integration: false,
+            buffer_editor: String::new(),
             disable_table_indexes: false,
         }
     }
@@ -256,6 +258,14 @@ impl Value {
                             eprintln!("$config.shell_integration is not a bool")
                         }
                     }
+                    "buffer_editor" => {
+                        if let Ok(v) = value.as_string() {
+                            config.buffer_editor = v.to_lowercase();
+                        } else {
+                            eprintln!("$config.buffer_editor is not a string")
+                        }
+                    }
+
                     "disable_table_indexes" => {
                         if let Ok(b) = value.as_bool() {
                             config.disable_table_indexes = b;

docs/sample_config/default_config.nu

@@ -190,6 +190,7 @@ let-env config = {
   completion_algorithm: "prefix"  # prefix, fuzzy
   animate_prompt: false # redraw the prompt every second
   float_precision: 2
+  buffer_editor: "emacs" # command that will be used to edit the current line buffer with ctr+e
   use_ansi_coloring: true
   filesize_format: "auto" # b, kb, kib, mb, mib, gb, gib, tb, tib, pb, pib, eb, eib, zb, zib, auto
   edit_mode: emacs # emacs, vi