[WIP] Improve CLI usage output

driver/Cargo.toml

@@ -15,6 +15,7 @@ color-print = "0.3.6"
 derive_more = { workspace = true }
 juice-core = { workspace = true }
 juice-frontend = { workspace = true }
+replace_with = "0.1.7"
 tempfile = "3.10.1"
 tokio = { version = "1.36.0", features = ["full"] }
 which = "6.0.0"

driver/src/cli.rs

@@ -9,6 +9,7 @@ use std::{
 use clap::{error::ErrorKind, Args, CommandFactory, Parser, Subcommand};
 use juice_core::OutputStream;
 use juice_frontend::{RunnerAction as FrontendAction, RunnerArgs as FrontendArgs};
+use replace_with::replace_with_or_abort;
 
 use crate::driver::{Error as DriverError, MainAction, MainArgs, Result as DriverResult};
 
@@ -85,6 +86,15 @@ mod private {
     impl FrontendArgs {
         pub fn validate(&self, mut cmd: clap::Command) {
             if self.json && !(self.dump_parse || self.dump_ast) {
+                // This is an ugly hack to get the usage output to look kinda like it does for errors generated by clap
+                let bin_name = cmd.get_bin_name().unwrap_or("juice").to_string();
+                let cmd = if let Some(cmd) = cmd.find_subcommand_mut("frontend") {
+                    replace_with_or_abort(cmd, |cmd| cmd.bin_name(format!("{} frontend", bin_name)));
+                    cmd
+                } else {
+                    &mut cmd
+                };
+
                 const MESSAGE: &str = color_print::cstr!(
                     "<bold>--json</bold> can only be used together with \
                     <bold>--dump-parse</bold> or <bold>--dump-ast</bold>"