allow for arguments in EDITOR and VISUAL env vars (#8105)

# Description

Fixes #8051.

# User-Facing Changes

You can now put command arguments into the EDITOR and VISUAL config /
env variables.

# Tests + Formatting

I don't know how to write tests for this. However, I set $env.EDITOR to
"nvim -R" and it seemed to work.

# After Submitting

If your PR had any user-facing changes, update [the
documentation](https://github.com/nushell/nushell.github.io) after the
PR is merged, if necessary. This will help us keep the docs up to date.

crates/nu-command/src/env/config/config_env.rs

@@ -2,12 +2,10 @@ use nu_engine::env_to_strings;
 use nu_protocol::{
     ast::Call,
     engine::{Command, EngineState, Stack},
-    Category, Example, PipelineData, ShellError, Signature, Span, Spanned, Type,
+    Category, Example, PipelineData, ShellError, Signature, Type,
 };
 
-use crate::ExternalCommand;
-
-use super::utils::get_editor;
+use super::utils::{gen_command, get_editor};
 
 #[derive(Clone)]
 pub struct ConfigEnv;
@@ -60,26 +58,13 @@ impl Command for ConfigEnv {
         let mut nu_config = config_path.clone();
         nu_config.push("env.nu");
 
-        let name = Spanned {
-            item: get_editor(engine_state, stack)?,
-            span: call.head,
-        };
+        let (item, config_args) = get_editor(engine_state, stack)?;
 
-        let args = vec![Spanned {
-            item: nu_config.to_string_lossy().to_string(),
-            span: Span::unknown(),
-        }];
-
-        let command = ExternalCommand {
-            name,
-            args,
-            arg_keep_raw: vec![false],
-            redirect_stdout: false,
-            redirect_stderr: false,
-            env_vars: env_vars_str,
-            trim_end_newline: false,
-        };
-
-        command.run_with_input(engine_state, stack, input, true)
+        gen_command(call.head, nu_config, item, config_args, env_vars_str).run_with_input(
+            engine_state,
+            stack,
+            input,
+            true,
+        )
     }
 }

crates/nu-command/src/env/config/config_nu.rs

@@ -2,12 +2,10 @@ use nu_engine::env_to_strings;
 use nu_protocol::{
     ast::Call,
     engine::{Command, EngineState, Stack},
-    Category, Example, PipelineData, ShellError, Signature, Span, Spanned, Type,
+    Category, Example, PipelineData, ShellError, Signature, Type,
 };
 
-use crate::ExternalCommand;
-
-use super::utils::get_editor;
+use super::utils::{gen_command, get_editor};
 
 #[derive(Clone)]
 pub struct ConfigNu;
@@ -60,26 +58,13 @@ impl Command for ConfigNu {
         let mut nu_config = config_path.clone();
         nu_config.push("config.nu");
 
-        let name = Spanned {
-            item: get_editor(engine_state, stack)?,
-            span: call.head,
-        };
+        let (item, config_args) = get_editor(engine_state, stack)?;
 
-        let args = vec![Spanned {
-            item: nu_config.to_string_lossy().to_string(),
-            span: Span::unknown(),
-        }];
-
-        let command = ExternalCommand {
-            name,
-            args,
-            arg_keep_raw: vec![false],
-            redirect_stdout: false,
-            redirect_stderr: false,
-            env_vars: env_vars_str,
-            trim_end_newline: false,
-        };
-
-        command.run_with_input(engine_state, stack, input, true)
+        gen_command(call.head, nu_config, item, config_args, env_vars_str).run_with_input(
+            engine_state,
+            stack,
+            input,
+            true,
+        )
     }
 }

crates/nu-command/src/env/config/utils.rs

@@ -1,12 +1,19 @@
-use nu_protocol::engine::{EngineState, Stack};
+use std::{collections::HashMap, path::PathBuf};
+
+use nu_protocol::{
+    engine::{EngineState, Stack},
+    Span, Spanned,
+};
+
+use crate::ExternalCommand;
 
 pub(crate) fn get_editor(
     engine_state: &EngineState,
     stack: &mut Stack,
-) -> Result<String, nu_protocol::ShellError> {
+) -> Result<(String, Vec<String>), nu_protocol::ShellError> {
     let config = engine_state.get_config();
     let env_vars = stack.get_env_vars(engine_state);
-    if !config.buffer_editor.is_empty() {
+    let editor = if !config.buffer_editor.is_empty() {
         Ok(config.buffer_editor.clone())
     } else if let Some(value) = env_vars.get("EDITOR") {
         value.as_string()
@@ -16,5 +23,50 @@ pub(crate) fn get_editor(
         Ok("notepad".to_string())
     } else {
         Ok("nano".to_string())
+    }?;
+    if let Some((a, b)) = editor.split_once(' ') {
+        Ok((
+            a.to_string(),
+            b.split(' ')
+                .into_iter()
+                .map(|s| s.to_string())
+                .collect::<Vec<String>>(),
+        ))
+    } else {
+        Ok((editor, Vec::new()))
+    }
+}
+
+pub(crate) fn gen_command(
+    span: Span,
+    config_path: PathBuf,
+    item: String,
+    config_args: Vec<String>,
+    env_vars_str: HashMap<String, String>,
+) -> ExternalCommand {
+    let name = Spanned { item, span };
+
+    let mut args = vec![Spanned {
+        item: config_path.to_string_lossy().to_string(),
+        span: Span::unknown(),
+    }];
+
+    let number_of_args = config_args.len() + 1;
+
+    for arg in config_args {
+        args.push(Spanned {
+            item: arg,
+            span: Span::unknown(),
+        })
+    }
+
+    ExternalCommand {
+        name,
+        args,
+        arg_keep_raw: vec![false; number_of_args],
+        redirect_stdout: false,
+        redirect_stderr: false,
+        env_vars: env_vars_str,
+        trim_end_newline: false,
     }
 }