Remove pub declarations and move to posix::*

This is in order to prepare also for SysV message queues.

src/posix/send.rs

@@ -0,0 +1,68 @@
+use anyhow::Result;
+use chrono::DateTime;
+use clap::Clap;
+use humantime::Duration;
+
+/// Send a message to a message queue
+#[derive(Clap, Debug)]
+pub struct Send {
+    /// Set a different priority, priority >= 0
+    #[clap(short, long, default_value = "0")]
+    pub priority: u32,
+    /// Do not block
+    #[clap(short, long)]
+    pub non_blocking: bool,
+    /// Timeout, example "5h 23min 42ms"
+    #[clap(short = 'o', long, conflicts_with = "deadline")]
+    pub timeout: Option<String>,
+    /// Deadline until messages are sent (format: "%Y-%m-%d %H:%M:%S")
+    #[clap(short, long, conflicts_with = "timeout")]
+    pub deadline: Option<String>,
+    /// Name of the queue
+    #[clap(value_name = "QUEUE")]
+    pub queue: String,
+    /// Message to be sent to the queue
+    #[clap(value_name = "MESSAGE")]
+    pub msg: String,
+}
+
+fn print_verbose(verbose: bool, msg: &str, queue: &str) {
+    if verbose {
+        println!("Sent message: \"{}\" to queue: {}", &msg, &queue);
+    }
+}
+
+impl Send {
+    pub fn run(&self, verbose: bool) -> Result<()> {
+        let mq = &mut posixmq::OpenOptions::writeonly();
+
+        if self.non_blocking {
+            mq.nonblocking();
+        }
+
+        if let Some(timeout) = &self.timeout {
+            mq.open(&self.queue)?.send_timeout(
+                self.priority,
+                &self.msg.as_bytes(),
+                *timeout.parse::<Duration>()?,
+            )?;
+
+            print_verbose(verbose, &self.msg, &self.queue);
+        } else if let Some(deadline) = &self.deadline {
+            mq.open(&self.queue)?.send_deadline(
+                self.priority,
+                &self.msg.as_bytes(),
+                DateTime::parse_from_str(deadline, "%Y-%m-%d %H:%M:%S")?.into(),
+            )?;
+
+            print_verbose(verbose, &self.msg, &self.queue);
+        } else {
+            mq.open(&self.queue)?
+                .send(self.priority, &self.msg.as_bytes())?;
+
+            print_verbose(verbose, &self.msg, &self.queue);
+        }
+
+        Ok(())
+    }
+}