--- a/rust/rhg/src/commands/files.rs	Mon Feb 08 11:13:56 2021 +0100
+++ b/rust/rhg/src/commands/files.rs	Mon Feb 08 20:33:04 2021 +0100
@@ -1,6 +1,6 @@
-use crate::commands::Command;
 use crate::error::CommandError;
 use crate::ui::Ui;
+use clap::ArgMatches;
 use hg::config::Config;
 use hg::operations::list_rev_tracked_files;
 use hg::operations::Dirstate;
@@ -14,49 +14,42 @@
 Returns 0 on success.
 ";
 
-pub struct FilesCommand<'a> {
-    rev: Option<&'a str>,
-}
-
-impl<'a> FilesCommand<'a> {
-    pub fn new(rev: Option<&'a str>) -> Self {
-        FilesCommand { rev }
-    }
+pub fn run(
+    ui: &Ui,
+    config: &Config,
+    args: &ArgMatches,
+) -> Result<(), CommandError> {
+    let rev = args.value_of("rev");
 
-    fn display_files(
-        &self,
-        ui: &Ui,
-        repo: &Repo,
-        files: impl IntoIterator<Item = &'a HgPath>,
-    ) -> Result<(), CommandError> {
-        let cwd = hg::utils::current_dir()?;
-        let rooted_cwd = cwd
-            .strip_prefix(repo.working_directory_path())
-            .expect("cwd was already checked within the repository");
-        let rooted_cwd = HgPathBuf::from(get_bytes_from_path(rooted_cwd));
-
-        let mut stdout = ui.stdout_buffer();
-
-        for file in files {
-            stdout.write_all(relativize_path(file, &rooted_cwd).as_ref())?;
-            stdout.write_all(b"\n")?;
-        }
-        stdout.flush()?;
-        Ok(())
+    let repo = Repo::find(config)?;
+    if let Some(rev) = rev {
+        let files =
+            list_rev_tracked_files(&repo, rev).map_err(|e| (e, rev))?;
+        display_files(ui, &repo, files.iter())
+    } else {
+        let distate = Dirstate::new(&repo)?;
+        let files = distate.tracked_files()?;
+        display_files(ui, &repo, files)
     }
 }
 
-impl<'a> Command for FilesCommand<'a> {
-    fn run(&self, ui: &Ui, config: &Config) -> Result<(), CommandError> {
-        let repo = Repo::find(config)?;
-        if let Some(rev) = self.rev {
-            let files =
-                list_rev_tracked_files(&repo, rev).map_err(|e| (e, rev))?;
-            self.display_files(ui, &repo, files.iter())
-        } else {
-            let distate = Dirstate::new(&repo)?;
-            let files = distate.tracked_files()?;
-            self.display_files(ui, &repo, files)
-        }
+fn display_files<'a>(
+    ui: &Ui,
+    repo: &Repo,
+    files: impl IntoIterator<Item = &'a HgPath>,
+) -> Result<(), CommandError> {
+    let cwd = hg::utils::current_dir()?;
+    let rooted_cwd = cwd
+        .strip_prefix(repo.working_directory_path())
+        .expect("cwd was already checked within the repository");
+    let rooted_cwd = HgPathBuf::from(get_bytes_from_path(rooted_cwd));
+
+    let mut stdout = ui.stdout_buffer();
+
+    for file in files {
+        stdout.write_all(relativize_path(file, &rooted_cwd).as_ref())?;
+        stdout.write_all(b"\n")?;
     }
+    stdout.flush()?;
+    Ok(())
 }