cli: `rad patch --help` opens man page

This is the same behavior as `git`. We also update the man page to have
the full list of commands and flags.

rad-patch.1.adoc

@@ -12,7 +12,16 @@ rad-patch - Manage radicle patches.
 
 == Synopsis
 
-*rad patch* *
+*rad patch* [<option>...] +
+*rad patch* _list_ [--all|--merged|--open|--archived|--draft] [<option>...] +
+*rad patch* _show_ <patch-id> [<option>...] +
+*rad patch* _archive_ <patch-id> [<option>...] +
+*rad patch* _update_ <patch-id> [<option>...] +
+*rad patch* _checkout_ <patch-id> [<option>...] +
+*rad patch* _delete_ <patch-id> [<option>...] +
+*rad patch* _redact_ <revision-id> [<option>...] +
+*rad patch* _ready_ <patch-id> [--undo] [<option>...] +
+*rad patch* _edit_ <patch-id> [<option>...] +
 
 == Description
 
@@ -20,13 +29,64 @@ The Radicle *patch* command is used for managing changesets inside of Radicle
 repositories.
 
 Though many actions can be performed using *rad patch*, certain patch-related
-actions require using *git* directly. For example, opening a patch is typically
+actions use *git* directly. For example, opening a patch is typically
 done using *git push*, while merging a patch is done with a combination of
 *git merge* and *git push*.
 
 To make this possible, Radicle ships with a helper program, *git-remote-rad*
 which is invoked by *git* on push and fetch to and from Radicle remotes.
 
+== Commands
+
+With no arguments, *rad patch* defaults to the _list_ command, showing the list of
+open patches for the current repository.
+
+=== show
+
+Shows information on the given patch.
+
+*<patch-id>*::                       The patch to show
+*--patch*, *-p*::                    Show the patch changes in git patch format
+*--verbose*, *-v*::                  Show additional information about the patch
+
+=== edit
+
+Edits a patch revision comment. To edit the patch title or description, pass
+in the *<patch-id>*. To edit a revision comment, pass that revision's
+*<revision-id>*.
+
+*<revision-id>*::
+The revision to edit.
+
+*--message*, *-m [<string>]*::
+Comment message to the patch or revision. If omitted, Radicle will prompt for
+a comment string via *$EDITOR*.
+
+=== list
+
+List patches in the current repository. The default is *--open*.
+
+*--all*::                  List all patches, including merged and archived patches
+*--archived*::             List only archived patches
+*--merged*::               List only merged patches
+*--open*::                 List only open patches
+*--draft*::                List only draft patches
+
+=== ready
+
+Mark a patch as ready to review. This changes the state of a patch from *draft*
+to *open*.
+
+*--undo*::                 Change a patch back to *draft*
+
+=== update
+
+Updates a patch to the current repository *HEAD*. This is a low-level command
+that should only be used when using *git push rad* is not possible.
+
+*--message*, *-m [<string>]*::   Provide a comment message to the revision
+*--no-message*::                 Leave the revision comment message blank
+
 == Opening a patch
 
 To open a patch, we start by making changes to our working copy, typically on
@@ -148,7 +208,3 @@ our master branch. Then we pushed to our *rad* remote.
 To list patches, run *rad patch*. By default, this will only show open patches.
 To list all patches, including ones that have been merged or archived, add the
 *--all* option.
-
-== Other patch commands
-
-For a full list of patch sub-commands, run *rad patch --help*.

radicle-cli/src/commands/patch.rs

@@ -242,7 +242,10 @@ impl Args for Options {
                 Long("verbose") | Short('v') => {
                     verbose = true;
                 }
-                Long("help") | Short('h') => {
+                Long("help") => {
+                    return Err(Error::HelpManual.into());
+                }
+                Short('h') => {
                     return Err(Error::Help.into());
                 }
 

radicle-cli/src/terminal.rs

@@ -76,28 +76,30 @@ where
             opts
         }
         Err(err) => {
-            match err.downcast_ref::<Error>() {
+            let hint = match err.downcast_ref::<Error>() {
                 Some(Error::Help) => {
                     term::help(help.name, help.version, help.description, help.usage);
                     process::exit(0);
                 }
+                Some(Error::HelpManual) => {
+                    let Ok(status) = term::manual(help.name) else {
+                        perror(help.name, "failed to load manual page");
+                        process::exit(1);
+                    };
+                    process::exit(status.code().unwrap_or(0));
+                }
                 Some(Error::Usage) => {
                     term::usage(help.name, help.usage);
                     process::exit(1);
                 }
-                _ => {}
+                Some(Error::WithHint { hint, .. }) => Some(hint),
+                None => None,
             };
-            eprintln!(
-                "{} {} rad {}: {err}",
-                Paint::red(ERROR_PREFIX),
-                Paint::red("Error:"),
-                help.name,
-            );
+            perror(help.name, &err);
 
-            if let Some(Error::WithHint { hint, .. }) = err.downcast_ref::<Error>() {
+            if let Some(hint) = hint {
                 eprintln!("{}", Paint::yellow(hint));
             }
-
             process::exit(1);
         }
     };
@@ -123,6 +125,15 @@ pub fn profile() -> Result<Profile, anyhow::Error> {
     }
 }
 
+pub fn perror(name: &str, err: impl std::fmt::Display) {
+    eprintln!(
+        "{} {} rad {}: {err}",
+        Paint::red(ERROR_PREFIX),
+        Paint::red("Error:"),
+        name,
+    );
+}
+
 pub fn fail(header: &str, error: &anyhow::Error) {
     let err = error.to_string();
     let err = err.trim_end();

radicle-cli/src/terminal/args.rs

@@ -15,6 +15,9 @@ pub enum Error {
     /// If this error is returned from argument parsing, help is displayed.
     #[error("help invoked")]
     Help,
+    /// If this error is returned from argument parsing, the manual page is displayed.
+    #[error("help manual invoked")]
+    HelpManual,
     /// If this error is returned from argument parsing, usage is displayed.
     #[error("usage invoked")]
     Usage,

radicle-term/src/io.rs

@@ -1,5 +1,5 @@
 use std::ffi::OsStr;
-use std::{env, fmt};
+use std::{env, fmt, io, process};
 
 use inquire::ui::{ErrorMessageRenderConfig, StyleSheet, Styled};
 use inquire::InquireError;
@@ -123,6 +123,14 @@ pub fn help(name: &str, version: &str, description: &str, usage: &str) {
     println!("rad-{name} {version}\n{description}\n{usage}");
 }
 
+pub fn manual(name: &str) -> io::Result<process::ExitStatus> {
+    let mut child = process::Command::new("man")
+        .arg(format!("rad-{name}"))
+        .spawn()?;
+
+    child.wait()
+}
+
 pub fn usage(name: &str, usage: &str) {
     println!(
         "{} {}\n{}",