Add start and stop commands

cli/src/cmd/stop.rs

@@ -0,0 +1,48 @@
+use clap::{App, ArgMatches, SubCommand as ClapSubCommand};
+use failure::Fallible;
+
+use crate::cmd::{shared, ArgMatchResult, CommandInvocation};
+
+#[derive(Debug)]
+struct Invocation {
+    task: String,
+}
+
+define_subcommand! {
+    fn decorate_app<'a>(&self, app: App<'a, 'a>) -> App<'a, 'a> {
+        app.subcommand(
+            ClapSubCommand::with_name("stop")
+                .about("stop the given task")
+                .arg(shared::task_arg()))
+    }
+
+    fn arg_match<'a>(&self, matches: &ArgMatches<'a>) -> ArgMatchResult {
+        match matches.subcommand() {
+            ("stop", Some(matches)) => ArgMatchResult::Ok(Box::new(Invocation {
+                task: matches.value_of("task").unwrap().into(),
+            })),
+            _ => ArgMatchResult::None,
+        }
+    }
+}
+
+subcommand_invocation! {
+    fn run(&self, command: &CommandInvocation) -> Fallible<()> {
+        let mut replica = command.get_replica();
+        let task = shared::get_task(&mut replica, &self.task)?;
+        task.into_mut(&mut replica).stop()?;
+        Ok(())
+    }
+}
+
+#[cfg(test)]
+mod test {
+    use super::*;
+
+    #[test]
+    fn parse_command() {
+        with_subcommand_invocation!(vec!["task", "stop", "1"], |inv: &Invocation| {
+            assert_eq!(inv.task, "1".to_string());
+        });
+    }
+}