diff -r b18e877ea304 -r 85f5d11c77dd rust/rhg/src/commands/debugrhgsparse.rs
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/rust/rhg/src/commands/debugrhgsparse.rs	Tue Jul 19 15:37:09 2022 +0200
@@ -0,0 +1,43 @@
+use std::os::unix::prelude::OsStrExt;
+
+use crate::error::CommandError;
+use clap::SubCommand;
+use hg::{self, utils::hg_path::HgPath};
+
+pub const HELP_TEXT: &str = "";
+
+pub fn args() -> clap::App<'static, 'static> {
+    SubCommand::with_name("debugrhgsparse")
+        .arg(
+            clap::Arg::with_name("files")
+                .required(true)
+                .multiple(true)
+                .empty_values(false)
+                .value_name("FILES")
+                .help("Files to check against sparse profile"),
+        )
+        .about(HELP_TEXT)
+}
+
+pub fn run(invocation: &crate::CliInvocation) -> Result<(), CommandError> {
+    let repo = invocation.repo?;
+
+    let (matcher, _warnings) = hg::sparse::matcher(&repo).unwrap();
+    let files = invocation.subcommand_args.values_of_os("files");
+    if let Some(files) = files {
+        for file in files {
+            invocation.ui.write_stdout(b"matches: ")?;
+            invocation.ui.write_stdout(
+                if matcher.matches(HgPath::new(file.as_bytes())) {
+                    b"yes"
+                } else {
+                    b"no"
+                },
+            )?;
+            invocation.ui.write_stdout(b" | file: ")?;
+            invocation.ui.write_stdout(file.as_bytes())?;
+            invocation.ui.write_stdout(b"\n")?;
+        }
+    }
+    Ok(())
+}