Creating a custom error message for missing SPI.h (because we changed the Ethernet library to rely on it). issue #337

Author: damellis

app/src/processing/app/debug/Compiler.java

@@ -354,16 +354,25 @@ public void message(String s) {
 
     if (pieces != null) {
       RunnerException e = sketch.placeException(pieces[3], pieces[1], PApplet.parseInt(pieces[2]) - 1);
-      
-      if (e != null) {
+
+      // replace full file path with the name of the sketch tab (unless we're
+      // in verbose mode, in which case don't modify the compiler output)
+      if (e != null && !verbose) {
         SketchCode code = sketch.getCode(e.getCodeIndex());
         String fileName = code.isExtension(sketch.getDefaultExtension()) ? code.getPrettyName() : code.getFileName();
-        if (!verbose) s = fileName + ":" + e.getCodeLine() + ": error: " + e.getMessage();
-        if (exception == null) {
-          exception = e;
-          exception.hideStackTrace();
-        }
+        s = fileName + ":" + e.getCodeLine() + ": error: " + e.getMessage();        
       }
+      
+      if (pieces[3].trim().equals("SPI.h: No such file or directory")) {
+        e = new RunnerException("Import the SPI library from the Sketch menu.");
+        s += "\nAs of Arduino 0019, the Ethernet library depends on the SPI library." +
+             "\nPlease import it from the Sketch > Import Library menu.";
+      }        
+      
+      if (exception == null && e != null) {
+        exception = e;
+        exception.hideStackTrace();
+      }      
     }
 
     System.err.print(s);