Merge pull request #459 from WaDelma/master

Expose logging levels

src/lib.rs

@@ -560,6 +560,13 @@ impl Level {
     pub fn as_str(&self) -> &'static str {
         LOG_LEVEL_NAMES[*self as usize]
     }
+
+    /// Iterate through all supported logging levels
+    ///
+    /// The order of iteration is from more severe to less severe log messages
+    pub fn iter() -> impl Iterator<Item = Self> {
+        (1..).flat_map(Self::from_usize)
+    }
 }
 
 /// An enum representing the available verbosity level filters of the logger.
@@ -722,6 +729,13 @@ impl LevelFilter {
     pub fn as_str(&self) -> &'static str {
         LOG_LEVEL_NAMES[*self as usize]
     }
+
+    /// Iterate through all supported filtering levels
+    ///
+    /// The order of iteration is from less to more verbose filtering
+    pub fn iter() -> impl Iterator<Item = Self> {
+        (0..).flat_map(Self::from_usize)
+    }
 }
 
 #[derive(Copy, Clone, Eq, PartialEq, Ord, PartialOrd, Hash, Debug)]