Add --output / -o option to specify a specific output file (#35)

cmd/goslice/slicer.go

@@ -168,7 +168,11 @@ func (s *GoSlice) Process() error {
 		return err
 	}
 
-	err = s.writer.Write(finalGcode, s.options.GoSlice.InputFilePath+".gcode")
+	if s.options.GoSlice.OutputFilePath == "" {
+		s.options.GoSlice.OutputFilePath = s.options.GoSlice.InputFilePath + ".gcode"
+	}
+
+	err = s.writer.Write(finalGcode, s.options.GoSlice.OutputFilePath)
 	fmt.Println("full processing time:", time.Now().Sub(startTime))
 
 	return err

data/option.go

@@ -272,6 +272,9 @@ type GoSliceOptions struct {
 
 	// InputFilePath specifies the path to the input stl file.
 	InputFilePath string
+
+	// OutputFilePath specifies the path to the output gcode file.
+	OutputFilePath string
 }
 
 // Options contains all GoSlice options.
@@ -338,6 +341,7 @@ func DefaultOptions() Options {
 			JoinPolygonSnapDistance:   160,
 			FinishPolygonSnapDistance: 1000,
 			InputFilePath:             "",
+			OutputFilePath:            "",
 		},
 	}
 }
@@ -357,6 +361,7 @@ func ParseFlags() Options {
 	flag.Var(&options.GoSlice.MeldDistance, "meld-distance", "The distance which two points have to be within to count them as one point.")
 	flag.Var(&options.GoSlice.JoinPolygonSnapDistance, "join-polygon-snap-distance", "The distance used to check if two open polygons can be snapped together to one bigger polygon. Checked by the start and endpoints of the polygons.")
 	flag.Var(&options.GoSlice.FinishPolygonSnapDistance, "finish-polygon-snap-distance", "The max distance between start end endpoint of a polygon used to check if a open polygon can be closed.")
+	flag.StringVarP(&options.GoSlice.OutputFilePath, "output", "o", options.GoSlice.OutputFilePath, "File path for the output gcode file. Default is the inout file path with .gcode as file ending.")
 
 	// print options
 	flag.Var(&options.Print.IntialLayerSpeed, "initial-layer-speed", "The speed only for the first layer in mm per second.")