✨ Add composable logger core utilities

bitlogger/filters.mbt

@@ -0,0 +1,75 @@
+pub type RecordPredicate = (Record) -> Bool
+
+pub fn level_at_least(min_level : Level) -> RecordPredicate {
+  fn(rec) {
+    rec.level.priority() >= min_level.priority()
+  }
+}
+
+pub fn target_is(target : String) -> RecordPredicate {
+  fn(rec) {
+    rec.target == target
+  }
+}
+
+pub fn target_has_prefix(prefix : String) -> RecordPredicate {
+  fn(rec) {
+    rec.target.has_prefix(prefix)
+  }
+}
+
+pub fn message_contains(fragment : String) -> RecordPredicate {
+  fn(rec) {
+    rec.message.contains(fragment)
+  }
+}
+
+pub fn has_field(key : String) -> RecordPredicate {
+  fn(rec) {
+    for field in rec.fields {
+      if field.key == key {
+        return true
+      }
+    }
+    false
+  }
+}
+
+pub fn field_equals(key : String, value : String) -> RecordPredicate {
+  fn(rec) {
+    for field in rec.fields {
+      if field.key == key && field.value == value {
+        return true
+      }
+    }
+    false
+  }
+}
+
+pub fn not_(predicate : RecordPredicate) -> RecordPredicate {
+  fn(rec) {
+    !(predicate(rec))
+  }
+}
+
+pub fn all_of(predicates : Array[RecordPredicate]) -> RecordPredicate {
+  fn(rec) {
+    for predicate in predicates {
+      if !(predicate(rec)) {
+        return false
+      }
+    }
+    true
+  }
+}
+
+pub fn any_of(predicates : Array[RecordPredicate]) -> RecordPredicate {
+  fn(rec) {
+    for predicate in predicates {
+      if predicate(rec) {
+        return true
+      }
+    }
+    false
+  }
+}