cli: Support colors in git helper output

radicle-cli/examples/rad-patch-via-push.md

@@ -9,10 +9,9 @@ Switched to a new branch 'feature/1'
 $ git commit -a -m "Add things" -q --allow-empty
 $ git push -o patch.message="Add things #1" -o patch.message="See commits for details." rad HEAD:refs/patches
 ✓ Patch 82faae29b2a2f11bf45bbba4c4787d6b32a12447 opened
-hint: to update, run `git push`,
-      or `git push rad -f HEAD:patches/82faae29b2a2f11bf45bbba4c4787d6b32a12447`
+hint: to update, run `git push` or `git push rad -f HEAD:patches/82faae29b2a2f11bf45bbba4c4787d6b32a12447`
 hint: offline push, your node is not running
-      to sync with the network, run `rad node start`
+hint: to sync with the network, run `rad node start`
 To rad://z42hL2jL4XNk6K8oHQaSWfMgCL7ji/z6MknSLrJoTcukLrE435hVNQT4JUhbvWLX4kUzqkEStBU8Vi
  * [new reference]   HEAD -> refs/patches
 ```

radicle-remote-helper/src/lib.rs

@@ -9,7 +9,7 @@ mod push;
 
 use std::path::PathBuf;
 use std::str::FromStr;
-use std::{env, io};
+use std::{env, fmt, io};
 
 use radicle_cli::git::Rev;
 use thiserror::Error;
@@ -86,6 +86,10 @@ pub struct Options {
 
 /// Run the radicle remote helper using the given profile.
 pub fn run(profile: radicle::Profile) -> Result<(), Error> {
+    // Since we're going to be writing user output to `stderr`, make sure the paint
+    // module is aware of that.
+    cli::Paint::set_terminal(io::stderr());
+
     let url: Url = {
         let args = env::args().skip(1).take(2).collect::<Vec<_>>();
 
@@ -227,3 +231,8 @@ pub(crate) fn read_line<'a>(stdin: &io::Stdin, line: &'a mut String) -> io::Resu
 
     Ok(tokens)
 }
+
+/// Write a hint to the user.
+pub(crate) fn hint(s: impl fmt::Display) {
+    eprintln!("{}", cli::format::hint(format!("hint: {s}")));
+}

radicle-remote-helper/src/push.rs

@@ -21,7 +21,7 @@ use radicle::Profile;
 use radicle::{git, rad};
 use radicle_cli::terminal as cli;
 
-use crate::{read_line, Options};
+use crate::{hint, read_line, Options};
 
 /// Default timeout for syncing to the network after a push.
 const DEFAULT_SYNC_TIMEOUT: time::Duration = time::Duration::from_secs(9);
@@ -248,14 +248,14 @@ pub fn run(
                                 && !rollback
                             {
                                 if hints {
-                                    eprintln!(
-                                        "hint: you are attempting to push a commit that would \
-                                        cause your upstream to diverge from the canonical head"
+                                    hint(
+                                        "you are attempting to push a commit that would cause \
+                                        your upstream to diverge from the canonical head",
+                                    );
+                                    hint(
+                                        "to integrate the remote changes, run `git pull --rebase` \
+                                        and try again",
                                     );
-                                    eprintln!(
-                                        "hint: to integrate the remote changes, run `git pull --rebase` \
-                                        and try again"
-                                );
                                 }
                                 return Err(Error::HeadsDiverge(head.into(), *canonical_oid));
                             }
@@ -291,8 +291,8 @@ pub fn run(
                 // Nb. allow this to fail. The push to local storage was still successful.
                 sync(stored.id, node).ok();
             } else if hints {
-                eprintln!("hint: offline push, your node is not running");
-                eprintln!("      to sync with the network, run `rad node start`");
+                hint("offline push, your node is not running");
+                hint("to sync with the network, run `rad node start`");
             }
         }
     }
@@ -397,8 +397,9 @@ fn patch_open<G: Signer>(
                         // Remove the remote portion of the name, i.e.
                         // rad/patches/deadbeef -> patches/deadbeef
                         let name = name.split('/').skip(1).collect::<Vec<_>>().join("/");
-                        eprintln!("hint: to update, run `git push`,");
-                        eprintln!("      or `git push rad -f HEAD:{name}`");
+                        hint(format!(
+                            "to update, run `git push` or `git push rad -f HEAD:{name}`"
+                        ));
                     }
                 }
             }

radicle-term/src/format.rs

@@ -32,6 +32,10 @@ pub fn yellow<D: std::fmt::Display>(msg: D) -> Paint<D> {
     Paint::yellow(msg)
 }
 
+pub fn hint<D: std::fmt::Display>(msg: D) -> Paint<D> {
+    Paint::yellow(msg)
+}
+
 pub fn faint<D: std::fmt::Display>(msg: D) -> Paint<D> {
     Paint::fixed(236, msg)
 }

radicle-term/src/io.rs

@@ -178,7 +178,7 @@ pub fn error(error: impl fmt::Display) {
 }
 
 pub fn hint(hint: impl fmt::Display) {
-    println!("{ERROR_HINT_PREFIX} {}", Paint::yellow(hint));
+    println!("{ERROR_HINT_PREFIX} {}", format::hint(hint));
 }
 
 pub fn ask<D: fmt::Display>(prompt: D, default: bool) -> bool {