--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/rust/rhg/src/commands/config.rs	Mon Feb 08 23:41:58 2021 +0100
@@ -0,0 +1,52 @@
+use crate::error::CommandError;
+use crate::ui::Ui;
+use clap::Arg;
+use clap::ArgMatches;
+use format_bytes::format_bytes;
+use hg::config::Config;
+use hg::errors::HgError;
+use hg::repo::Repo;
+use hg::utils::SliceExt;
+use std::path::Path;
+
+pub const HELP_TEXT: &str = "
+With one argument of the form section.name, print just the value of that config item.
+";
+
+pub fn args() -> clap::App<'static, 'static> {
+    clap::SubCommand::with_name("config")
+        .arg(
+            Arg::with_name("name")
+                .help("the section.name to print")
+                .value_name("NAME")
+                .required(true)
+                .takes_value(true),
+        )
+        .about(HELP_TEXT)
+}
+
+pub fn run(
+    ui: &Ui,
+    config: &Config,
+    repo_path: Option<&Path>,
+    args: &ArgMatches,
+) -> Result<(), CommandError> {
+    let opt_repo = Repo::find_optional(config, repo_path)?;
+    let config = if let Some(repo) = &opt_repo {
+        repo.config()
+    } else {
+        config
+    };
+
+    let (section, name) = args
+        .value_of("name")
+        .expect("missing required CLI argument")
+        .as_bytes()
+        .split_2(b'.')
+        .ok_or_else(|| HgError::abort(""))?;
+
+    let value = config.get(section, name).unwrap_or(b"");
+
+    ui.write_stdout(&format_bytes!(b"{}\n", value))?;
+    Ok(())
+}