--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/rust/rhg/src/commands/script_hgignore.rs	Fri Dec 13 15:05:37 2024 +0000
@@ -0,0 +1,42 @@
+use clap::Arg;
+use hg::matchers::ReSyntax;
+
+use crate::error::CommandError;
+
+use super::debugignorerhg::WhichPatterns;
+
+pub const HELP_TEXT: &str = "
+Show effective hgignore patterns used by rhg.
+
+This is a pure Rust version of `hg debugignore`.
+
+Some options might be missing, check the list below.
+";
+
+pub fn args() -> clap::Command {
+    clap::command!("script::hgignore")
+    .arg(
+        Arg::new("print-re")
+            .help("Print the regular expression that matches all ignored files.")
+            .action(clap::ArgAction::SetTrue)
+            .long("print-re"),
+    ).about(HELP_TEXT)
+}
+
+pub fn run(invocation: &crate::CliInvocation) -> Result<(), CommandError> {
+    let repo = invocation.repo?;
+    let args = invocation.subcommand_args;
+    let print_re = args.get_flag("print-re");
+    if !print_re {
+        return Err(CommandError::unsupported(
+            "Unsupported invocation: flag --print-re is required",
+        ));
+    }
+
+    crate::commands::debugignorerhg::work(
+        repo,
+        invocation.ui,
+        WhichPatterns::All,
+        ReSyntax::Tidy,
+    )
+}