add delete subcommand

cli/src/cmd/delete.rs

@@ -0,0 +1,52 @@
+use clap::{App, ArgMatches, SubCommand as ClapSubCommand};
+use failure::Fallible;
+use taskchampion::Status;
+
+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("delete")
+                .about("mark the given task as deleted")
+                .arg(shared::task_arg()))
+    }
+
+    fn arg_match<'a>(&self, matches: &ArgMatches<'a>) -> ArgMatchResult {
+        match matches.subcommand() {
+            ("delete", 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)?;
+        let mut task = task.into_mut(&mut replica);
+        task.stop()?;
+        task.set_status(Status::Deleted)?;
+        Ok(())
+    }
+}
+
+#[cfg(test)]
+mod test {
+    use super::*;
+
+    #[test]
+    fn parse_command() {
+        with_subcommand_invocation!(vec!["task", "delete", "1"], |inv: &Invocation| {
+            assert_eq!(inv.task, "1".to_string());
+        });
+    }
+}
+

cli/src/cmd/mod.rs

@@ -7,6 +7,7 @@ mod shared;
 
 mod add;
 mod debug;
+mod delete;
 mod done;
 mod gc;
 mod info;
@@ -22,6 +23,7 @@ pub(crate) fn subcommands() -> Vec<Box<dyn SubCommand>> {
     vec![
         add::cmd(),
         debug::cmd(),
+        delete::cmd(),
         done::cmd(),
         gc::cmd(),
         info::cmd(),