Print infos about a message queue

src/cli.rs

@@ -1,4 +1,4 @@
-use crate::{create::Create, unlink::Unlink};
+use crate::{create::Create, unlink::Unlink, info::Info};
 use clap::{crate_authors, crate_version, AppSettings, Clap};
 
 #[derive(Clap, Debug)]
@@ -20,5 +20,6 @@ pub struct Opts {
 #[derive(Clap, Debug)]
 pub enum Command {
     Create(Create),
+    Info(Info),
     Unlink(Unlink),
 }

src/info.rs

@@ -0,0 +1,24 @@
+use anyhow::Result;
+use clap::Clap;
+use posixmq::PosixMq;
+
+/// Print information about an existing message queue
+#[derive(Clap, Debug)]
+pub struct Info {
+    /// Name of the queue
+    #[clap(value_name = "QNAME")]
+    pub queue: String,
+}
+
+impl Info {
+    pub fn run(&self) -> Result<()> {
+        let attrs = PosixMq::open(&self.queue)?.attributes()?;
+
+        println!(
+            "Message queue: {}, msg_max: {}, msgsize_max: {}, current_messages: {}",
+            &self.queue, &attrs.capacity, &attrs.max_msg_len, &attrs.current_messages
+        );
+
+        Ok(())
+    }
+}

src/main.rs

@@ -3,6 +3,7 @@ use clap::Clap;
 
 mod cli;
 mod create;
+mod info;
 mod unlink;
 
 use cli::{Command, Opts};
@@ -12,6 +13,7 @@ fn main() -> Result<()> {
 
     match opts.command {
         Command::Create(c) => c.run(opts.verbose)?,
+        Command::Info(i) => i.run()?,
         Command::Unlink(u) => u.run(opts.verbose)?,
     }