cli: Improve missing man page handling

Instead of saying "no manual entry", we output regular help.

radicle-cli/src/terminal.rs

@@ -79,14 +79,19 @@ where
         Err(err) => {
             let hint = match err.downcast_ref::<Error>() {
                 Some(Error::Help) => {
-                    term::help(help.name, help.version, help.description, help.usage);
+                    help.print();
                     process::exit(0);
                 }
+                // Print the manual, or the regular help if there's an error.
                 Some(Error::HelpManual { name }) => {
                     let Ok(status) = term::manual(name) else {
-                        io::error(format!("rad {}: failed to load manual page", help.name));
-                        process::exit(1);
+                        help.print();
+                        process::exit(0);
                     };
+                    if !status.success() {
+                        help.print();
+                        process::exit(0);
+                    }
                     process::exit(status.code().unwrap_or(0));
                 }
                 Some(Error::Usage) => {

radicle-cli/src/terminal/args.rs

@@ -12,6 +12,7 @@ use radicle::node::{Address, Alias};
 use radicle::prelude::{Did, NodeId, RepoId};
 
 use crate::git::Rev;
+use crate::terminal as term;
 
 #[derive(thiserror::Error, Debug)]
 pub enum Error {
@@ -39,6 +40,13 @@ pub struct Help {
     pub usage: &'static str,
 }
 
+impl Help {
+    /// Print help to stdout.
+    pub fn print(&self) {
+        term::help(self.name, self.version, self.description, self.usage);
+    }
+}
+
 pub trait Args: Sized {
     fn from_env() -> anyhow::Result<Self> {
         let args: Vec<_> = std::env::args_os().skip(1).collect();

radicle-term/src/io.rs

@@ -1,5 +1,6 @@
 use std::ffi::OsStr;
 use std::fmt::Write;
+use std::process::Stdio;
 use std::{env, fmt, io, process};
 
 use inquire::ui::{ErrorMessageRenderConfig, StyleSheet, Styled};
@@ -139,7 +140,10 @@ pub fn help(name: &str, version: &str, description: &str, usage: &str) {
 }
 
 pub fn manual(name: &str) -> io::Result<process::ExitStatus> {
-    let mut child = process::Command::new("man").arg(name).spawn()?;
+    let mut child = process::Command::new("man")
+        .arg(name)
+        .stderr(Stdio::null())
+        .spawn()?;
 
     child.wait()
 }