Add error module for error handling

src/error.rs

@@ -0,0 +1,35 @@
+use runtime::Runtime;
+
+pub struct ImagErrorBase {
+    pub shortdesc : String,
+    pub longdesc  : String,
+}
+
+pub trait ImagError<'a> {
+    fn print(&self, rt: &Runtime);
+    fn print_long(&self, rt: &Runtime);
+    fn print_short(&self, rt: &Runtime);
+}
+
+impl<'a> ImagError<'a> for ImagErrorBase {
+
+    fn print(&self, rt: &Runtime) {
+        if self.longdesc.is_empty() {
+            let s = format!("Error: {}\n\n{}\n\n",
+                            self.shortdesc, self.longdesc);
+            rt.print(&s)
+        } else {
+            let s = format!("Error: {}\n", self.shortdesc);
+            rt.print(&s)
+        }
+    }
+
+    fn print_short(&self, rt : &Runtime) {
+        rt.print(&self.shortdesc)
+    }
+
+    fn print_long(&self, rt : &Runtime) {
+        rt.print(&self.longdesc)
+    }
+
+}

src/main.rs

@@ -5,6 +5,7 @@ use runtime::Runtime;
 use module::Module;
 
 mod cli;
+mod error;
 mod runtime;
 mod module;
 

src/module.rs

@@ -1,49 +1,35 @@
 use runtime::Runtime;
+use error::ImagErrorBase;
 
 pub struct ModuleError {
-    shortdesc : String,
-    longdesc  : String,
+    base: ImagErrorBase,
+    module_name: String,
 }
 
 impl ModuleError {
 
-    pub fn short(short : String) -> ModuleError {
-        ModuleError::new(short, "".to_string())
+    pub fn short<T: Module>(module : &T, short : String) -> ModuleError {
+        ModuleError::new(module, short, "".to_string())
     }
 
-    pub fn new(short : String, long : String) -> ModuleError {
+    pub fn new<T: Module>(module : &T, short : String, long : String) -> ModuleError {
         ModuleError {
+            base: ImagErrorBase {
                 shortdesc: short,
                 longdesc: long,
+            },
+            module_name: module.name(),
         }
     }
 
-    pub fn print(&self, rt : &Runtime) {
-        if self.longdesc.is_empty() {
-            let s = format!("Error: {}\n\n{}\n\n",
-                            self.shortdesc, self.longdesc);
-            rt.print(&s)
-        } else {
-            let s = format!("Error: {}\n", self.shortdesc);
-            rt.print(&s)
-        }
-    }
-
-    pub fn print_short(&self, rt : &Runtime) {
-        rt.print(&self.shortdesc)
-    }
-
-    pub fn print_long(&self, rt : &Runtime) {
-        rt.print(&self.longdesc)
-    }
-
 }
 
 pub trait Module {
 
-    fn load(self, &rt : Runtime) -> Self;
-    fn name(self) -> String;
+    fn new() -> Self;
+    fn load(&self, &rt : Runtime) -> Self;
+    fn name(&self) -> String;
 
-    fn execute(self, &rt : Runtime) -> Option<ModuleError>;
+    fn execute(&self, &rt : Runtime) -> Option<ModuleError>;
 
 }