move contents of taskchampion repo to tc/

rust/cli/src/invocation/cmd/help.rs

@@ -0,0 +1,30 @@
+use crate::usage::Usage;
+use termcolor::WriteColor;
+
+pub(crate) fn execute<W: WriteColor>(
+    w: &mut W,
+    command_name: String,
+    summary: bool,
+) -> Result<(), crate::Error> {
+    let usage = Usage::new();
+    usage.write_help(w, command_name.as_ref(), summary)?;
+    Ok(())
+}
+
+#[cfg(test)]
+mod test {
+    use super::*;
+    use crate::invocation::test::*;
+
+    #[test]
+    fn test_summary() {
+        let mut w = test_writer();
+        execute(&mut w, s!("ta"), true).unwrap();
+    }
+
+    #[test]
+    fn test_long() {
+        let mut w = test_writer();
+        execute(&mut w, s!("ta"), false).unwrap();
+    }
+}