Add: impl ImagError for ModuleError

src/module.rs

@@ -1,4 +1,5 @@
 use runtime::Runtime;
+use error::ImagError;
 use error::ImagErrorBase;
 
 pub struct ModuleError {
@@ -24,6 +25,36 @@ impl ModuleError {
 
 }
 
+impl<'a> ImagError<'a> for ModuleError {
+    fn print(&self, rt: &Runtime) {
+        if self.base.longdesc.is_empty() {
+            let s = format!("{}: {}\n\n{}\n\n",
+                            self.module_name,
+                            self.base.shortdesc,
+                            self.base.longdesc);
+            rt.print(&s)
+        } else {
+            let s = format!("{}: {}\n",
+                            self.module_name,
+                            self.base.shortdesc);
+            rt.print(&s)
+        }
+    }
+
+    fn print_short(&self, rt : &Runtime) {
+        let s = format!("{}: {}\n", self.module_name, self.base.shortdesc);
+        rt.print(&s)
+    }
+
+    fn print_long(&self, rt : &Runtime) {
+        let s = format!("{}: {}\n\n{}\n\n",
+                        self.module_name,
+                        self.base.shortdesc,
+                        self.base.longdesc);
+        rt.print(&s)
+    }
+}
+
 pub trait Module {
 
     fn new() -> Self;