Merge pull request #594 from matthiasbeyer/libimagutil/debug-mapping

Add utility to print debugging information while mapping

libimagutil/src/debug_result.rs

@@ -0,0 +1,8 @@
+generate_result_logging_extension!(
+    DebugResult,
+    map_dbg,
+    map_dbg_str,
+    map_dbg_err,
+    map_dbg_err_str,
+    |s| { debug!("{}", s); }
+);

libimagutil/src/info_result.rs

@@ -0,0 +1,8 @@
+generate_result_logging_extension!(
+    InfoResult,
+    map_info,
+    map_info_str,
+    map_info_err,
+    map_info_err_str,
+    |s| { info!("{}", s); }
+);

libimagutil/src/lib.rs

@@ -17,6 +17,9 @@
 #[macro_use] extern crate log;
 extern crate regex;
 
+#[macro_use] mod log_result;
+pub mod debug_result;
+pub mod info_result;
 pub mod ismatch;
 pub mod iter;
 pub mod key_value_split;

libimagutil/src/log_result.rs

@@ -0,0 +1,40 @@
+#[macro_export]
+macro_rules! generate_result_logging_extension {
+    {
+        $name: ident,
+        $map_name: ident,
+        $map_str_name: ident,
+        $map_err_name: ident,
+        $map_err_str_name: ident,
+        $closure: expr
+    } => {
+        pub trait InfoResult<T, E> : Sized {
+
+            fn $map_name<F: FnOnce(&T) -> String>(self, f: F) -> Self;
+
+            fn $map_str_name(self, s: &str) -> Self {
+                self.$map_name(|_| format!("{}", s))
+            }
+
+            fn $map_err_name<F: FnOnce(&E) -> String>(self, f: F) -> Self;
+
+            fn $map_err_str_name(self, s: &str) -> Self {
+                self.$map_err_name(|_| format!("{}", s))
+            }
+
+        }
+
+        impl<T, E> InfoResult<T, E> for Result<T, E> {
+
+            fn $map_name<F: FnOnce(&T) -> String>(self, f: F) -> Self {
+                self.map(|x| { $closure(f(&x)); x })
+            }
+
+            fn $map_err_name<F: FnOnce(&E) -> String>(self, f: F) -> Self {
+                self.map_err(|e| { $closure(f(&e)); e })
+            }
+
+        }
+
+    }
+}