slices cleaned up

README.md

@@ -139,7 +139,7 @@ selected for the next round of selection.
 Provide one number for a simple index.
 
 ```bash
-$ pup < robots.html a {0}
+$ pup < robots.html a slice{0}
 <a id="top">
 </a>
 ```
@@ -148,7 +148,7 @@ You can provide an end to limit the number of nodes selected.
 
 ```bash
 $ # {:3} is the same as {0:3}
-$ pup < robots.html a {:3}
+$ pup < robots.html a slice{:3}
 <a id="top">
 </a>
 <a href="#mw-navigation">
@@ -159,7 +159,24 @@ $ pup < robots.html a {:3}
 </a>
 ```
 
-The `by` index still needs work.
+The `by` indexer works particularly well with tables.
+
+```bash
+$ curl -s http://www.pro-football-reference.com/boxscores/201402020den.htm | \
+pup table#linescore td slice{::6}
+<td align="left">
+ <a href="/teams/sea/2013.htm">
+  Seattle Seahawks
+ </a>
+ (13-3-0)
+</td>
+<td align="left">
+ <a href="/teams/den/2013.htm">
+  Denver Broncos
+ </a>
+ (13-3-0)
+</td>
+```
 
 ## Implemented Selectors
 

main.go

@@ -12,7 +12,7 @@ import (
 	"strings"
 )
 
-const VERSION string = "0.2.0"
+const VERSION string = "0.2.1"
 
 var (
 	// Flags

selector/selector.go

@@ -269,7 +269,7 @@ func (sel SliceSelector) Select(nodes []*html.Node) []*html.Node {
 			selected = append(selected, nodes[i])
 		}
 	} else {
-		for i := end - 1; i > 0 && i >= start; i = i + by {
+		for i := end - 1; i >= 0 && i >= start; i = i + by {
 			selected = append(selected, nodes[i])
 		}
 	}
@@ -328,12 +328,12 @@ func parseSliceSelector(s string) (sel SliceSelector, err error) {
 
 func parseSelectorFunc(s string) (Selector, error) {
 	switch {
-	case strings.HasPrefix(s, "{"):
+	case strings.HasPrefix(s, "slice{"):
 		if !strings.HasSuffix(s, "}") {
 			return nil, fmt.Errorf(
 				"slice func must end with a '}'")
 		}
-		s = strings.TrimPrefix(s, "{")
+		s = strings.TrimPrefix(s, "slice{")
 		s = strings.TrimSuffix(s, "}")
 		return parseSliceSelector(s)
 	}