remote-helper: Rework Visibility Modifiers

Since this is a binary crate, `pub` is not necessary. By removing `pub`
at the boundary of the crate (`src/main.rs`) and working our way in we
obtain tighter boundaries. This enables dead-code elimination and more
liberal lints (see following two commits).

crates/radicle-remote-helper/src/fetch.rs

@@ -9,7 +9,7 @@ use crate::service::GitService;
 use crate::Verbosity;
 
 #[derive(Debug, Error)]
-pub enum Error {
+pub(super) enum Error {
     /// Protocol error.
     #[error("protocol error: {0}")]
     Protocol(#[from] crate::protocol::Error),

crates/radicle-remote-helper/src/list.rs

@@ -10,7 +10,7 @@ use radicle::storage::ReadRepository;
 use radicle::Profile;
 
 #[derive(Debug, Error)]
-pub enum Error {
+pub(super) enum Error {
     /// Storage error.
     #[error(transparent)]
     Storage(#[from] radicle::storage::Error),
@@ -35,7 +35,7 @@ pub enum Error {
 }
 
 /// List refs for fetching (`git fetch` and `git ls-remote`).
-pub fn for_fetch<R: ReadRepository + cob::Store<Namespace = NodeId> + 'static>(
+pub(super) fn for_fetch<R: ReadRepository + cob::Store<Namespace = NodeId> + 'static>(
     url: &Url,
     profile: &Profile,
     stored: &R,

crates/radicle-remote-helper/src/main.rs

@@ -40,7 +40,7 @@ use radicle_cli::terminal as cli;
 
 use crate::protocol::{Command, Line, LineReader};
 
-pub const VERSION: Version = Version {
+const VERSION: Version = Version {
     name: env!("CARGO_BIN_NAME"),
     commit: env!("GIT_HEAD"),
     version: env!("RADICLE_VERSION"),
@@ -79,7 +79,7 @@ fn main() {
 }
 
 #[derive(Debug, Error)]
-pub enum Error {
+enum Error {
     /// Failed to parse `base`.
     #[error("failed to parse base revision: {0}")]
     Base(#[source] git::raw::Error),
@@ -163,7 +163,7 @@ impl FromStr for Verbosity {
 
 /// Branch creation options when creating a patch.
 #[derive(Debug, Default, Clone)]
-pub enum Branch {
+enum Branch {
     /// Don't create a new branch.
     #[default]
     None,
@@ -176,10 +176,7 @@ pub enum Branch {
 impl Branch {
     /// Return the branch name to be used for the local branch when creating a
     /// patch.
-    pub fn to_branch_name(
-        self,
-        object: &radicle::patch::PatchId,
-    ) -> Option<git::fmt::Qualified<'_>> {
+    fn to_branch_name(self, object: &radicle::patch::PatchId) -> Option<git::fmt::Qualified<'_>> {
         match self {
             Self::None => None,
             Self::MirrorUpstream => Some(git::refs::patch(object)),
@@ -194,7 +191,7 @@ impl Branch {
 }
 
 #[derive(Debug, Default, Clone)]
-pub struct Options {
+struct Options {
     /// Don't sync after push.
     no_sync: bool,
     /// Sync debugging.
@@ -213,7 +210,7 @@ pub struct Options {
 }
 
 /// Run the radicle remote helper using the given profile.
-pub fn run(profile: radicle::Profile) -> Result<(), Error> {
+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(cli::TerminalFile::Stderr);

crates/radicle-remote-helper/src/push.rs

@@ -34,7 +34,7 @@ use crate::service::NodeSession;
 use crate::{hint, warn, Options, Verbosity};
 
 #[derive(Debug, Error)]
-pub enum Error {
+pub(super) enum Error {
     /// Public key doesn't match the remote namespace we're pushing to.
     #[error("cannot push to remote namespace owned by {0}")]
     KeyMismatch(Did),
@@ -250,7 +250,7 @@ impl PushAction {
 }
 
 /// Run a git push command.
-pub fn run(
+pub(super) fn run(
     mut specs: Vec<String>,
     remote: Option<git::fmt::RefString>,
     url: Url,

crates/radicle-remote-helper/src/push/canonical.rs

@@ -14,7 +14,7 @@ impl<'a, 'b, 'r, R> Canonical<'a, 'b, 'r, R>
 where
     R: effects::Ancestry + effects::FindMergeBase + effects::FindObjects,
 {
-    pub fn new(
+    pub(super) fn new(
         me: Did,
         object: canonical::Object,
         canonical: canonical::Canonical<'a, 'b, 'r, R, canonical::Initial>,
@@ -40,7 +40,9 @@ where
     /// copy, and that checks that any two commits are related in the graph.
     ///
     /// Ensures that the new head and the canonical commit do not diverge.
-    pub fn quorum(self) -> Result<(git::fmt::Qualified<'a>, canonical::Object), QuorumError> {
+    pub(super) fn quorum(
+        self,
+    ) -> Result<(git::fmt::Qualified<'a>, canonical::Object), QuorumError> {
         self.canonical
             .quorum()
             .map(|QuorumWithConvergence { quorum, .. }| (quorum.refname, quorum.object))
@@ -56,7 +58,7 @@ pub(crate) mod io {
     /// Handle recoverable errors, printing relevant information to the
     /// terminal. Otherwise, convert the error into an unrecoverable error
     /// [`error::CanonicalUnrecoverable`].
-    pub fn handle_error(e: QuorumError) -> Result<(), error::CanonicalUnrecoverable> {
+    pub(crate) fn handle_error(e: QuorumError) -> Result<(), error::CanonicalUnrecoverable> {
         match e {
             QuorumError::Convergence(err) => Err(err.into()),
             QuorumError::MergeBase(err) => Err(err.into()),

crates/radicle-remote-helper/src/push/error.rs

@@ -3,7 +3,7 @@ use radicle::git::canonical;
 use thiserror::Error;
 
 #[derive(Debug, Error)]
-pub enum CanonicalUnrecoverable {
+pub(crate) enum CanonicalUnrecoverable {
     #[error(transparent)]
     GraphDescendant(#[from] GraphDescendant),
     #[error(transparent)]
@@ -20,7 +20,7 @@ pub enum CanonicalUnrecoverable {
 
 #[derive(Debug, Error)]
 #[error("failed to check if {head} is an ancestor of {canonical} due to: {source}")]
-pub struct GraphDescendant {
+pub(crate) struct GraphDescendant {
     head: git::Oid,
     canonical: git::Oid,
     source: git::raw::Error,
@@ -29,13 +29,13 @@ pub struct GraphDescendant {
 #[derive(Debug, Error)]
 /// Head being pushed diverges from canonical head.
 #[error("refusing to update canonical reference to commit that is not a descendant of current canonical head")]
-pub struct HeadsDiverge {
+pub(crate) struct HeadsDiverge {
     head: git::Oid,
     canonical: git::Oid,
 }
 
 #[derive(Debug, Error)]
-pub enum PushAction {
+pub(crate) enum PushAction {
     #[error("invalid reference {refname}, expected qualified reference starting with `refs/`")]
     InvalidRef { refname: git::fmt::RefString },
     #[error("found refs/heads/patches/{suffix} where {suffix} was an invalid Patch ID: {source}")]