Add summary

src/report.rs

@@ -0,0 +1,21 @@
+use std::borrow::Cow;
+use std::collections::HashMap;
+use std::process::ExitStatus;
+
+pub type Report = HashMap<String, bool>;
+
+pub trait Reporter {
+    fn report<'a, M: Into<Cow<'a, str>>>(&self, key: M, report: &mut Report);
+}
+
+impl Reporter for ExitStatus {
+    fn report<'a, M: Into<Cow<'a, str>>>(&self, key: M, report: &mut Report) {
+        report.insert(key.into().into_owned(), self.success());
+    }
+}
+
+impl Reporter for bool {
+    fn report<'a, M: Into<Cow<'a, str>>>(&self, key: M, report: &mut Report) {
+        report.insert(key.into().into_owned(), *self);
+    }
+}