stats+log : am stats (agregats par agent, periodes 7d/30d/90d, barres ASCII) et am log (filtres agent/kind/date, limite) (issue #6)

src/events.rs

@@ -32,6 +32,24 @@ pub enum EventKind {
     Shell,
 }
 
+impl EventKind {
+    pub fn as_str(&self) -> &'static str {
+        match self {
+            EventKind::Start => "start",
+            EventKind::Stop => "stop",
+            EventKind::Run => "run",
+            EventKind::Restart => "restart",
+            EventKind::Install => "install",
+            EventKind::Update => "update",
+            EventKind::Uninstall => "uninstall",
+            EventKind::Doctor => "doctor",
+            EventKind::Config => "config",
+            EventKind::Repl => "repl",
+            EventKind::Shell => "shell",
+        }
+    }
+}
+
 /// One journal entry. Optional fields are omitted from the JSON line.
 #[derive(Debug, Clone, PartialEq, Serialize, Deserialize)]
 pub struct Event {