text function added

README.md

@@ -31,7 +31,7 @@ Download a webpage with `wget`.
 $ wget http://en.wikipedia.org/wiki/Robots_exclusion_standard -O robots.html
 ```
 
-###Clean and indent
+####Clean and indent
 
 By default `pup` will fill in missing tags and properly indent the page.
 
@@ -42,7 +42,7 @@ $ cat robots.html | pup --color
 # cleaned, indented, and colorful HTML
 ```
 
-###Filter by tag
+####Filter by tag
 ```bash
 $ pup < robots.html title
 <title>
@@ -50,7 +50,7 @@ $ pup < robots.html title
 </title>
 ```
 
-###Filter by id
+####Filter by id
 ```bash
 $ pup < robots.html span#See_also
 <span class="mw-headline" id="See_also">
@@ -58,7 +58,7 @@ $ pup < robots.html span#See_also
 </span>
 ```
 
-###Chain selectors together
+####Chain selectors together
 
 The following two commands are equivalent. (NOTE: pipes do not work with the
 `--color` flag)
@@ -86,14 +86,14 @@ Both produce the ouput:
 </a>
 ```
 
-###How many nodes are selected by a filter?
+####How many nodes are selected by a filter?
 
 ```bash
 $ pup < robots.html a -n
 283
 ```
 
-###Limit print level
+####Limit print level
 
 ```bash
 $ pup < robots.html table -l 2
@@ -134,6 +134,36 @@ You can mix and match selectors as you wish.
 cat index.html | pup element#id[attribute=value]
 ```
 
+## Functions
+
+Non-HTML selectors which effect the output type are implemented as functions
+which can be provided as a final argument.
+
+As of now, `text{}` is the only implemented function.
+
+#### `text{}`
+
+Print all text from selected nodes and children in depth first order.
+
+```bash
+$ cat robots.html | pup .mw-headline text{}
+History
+About the standard
+Disadvantages
+Alternatives
+Examples
+Nonstandard extensions
+Crawl-delay directive
+Allow directive
+Sitemap
+Host
+Universal "*" match
+Meta tags and headers
+See also
+References
+External links
+```
+
 ## Flags
 
 ```bash
@@ -148,5 +178,6 @@ cat index.html | pup element#id[attribute=value]
 
 ## TODO:
 
-* Print attribute value rather than html ({href}) 
-* Print result as JSON (--json)
+* Print attribute function `attr{attr1, attr2}`
+* Print as json function `json{}`
+* Switch `-n` from a flag to a function

funcs/display.go

@@ -0,0 +1,49 @@
+package funcs
+
+import (
+	"code.google.com/p/go.net/html"
+	"fmt"
+	"regexp"
+)
+
+type Displayer interface {
+	Display(nodes []*html.Node)
+}
+
+type TextDisplayer struct {
+}
+
+func (t TextDisplayer) Display(nodes []*html.Node) {
+	for _, node := range nodes {
+		if node.Type == html.TextNode {
+			fmt.Println(node.Data)
+		}
+		children := []*html.Node{}
+		child := node.FirstChild
+		for child != nil {
+			children = append(children, child)
+			child = child.NextSibling
+		}
+		t.Display(children)
+	}
+}
+
+var (
+	// Display function helpers
+	displayMatcher  *regexp.Regexp = regexp.MustCompile(`\{[^\}]*\}$`)
+	textFuncMatcher                = regexp.MustCompile(`^text\{\}$`)
+	attrFuncMatcher                = regexp.MustCompile(`^attr\{[^\}]*\}$`)
+)
+
+func NewDisplayFunc(text string) (Displayer, error) {
+	if !displayMatcher.MatchString(text) {
+		return nil, fmt.Errorf("Not a display function")
+	}
+	switch {
+	case textFuncMatcher.MatchString(text):
+		return TextDisplayer{}, nil
+	case attrFuncMatcher.MatchString(text):
+		return nil, fmt.Errorf("attr")
+	}
+	return nil, fmt.Errorf("Not a display function")
+}

main.go

@@ -3,6 +3,7 @@ package main
 import (
 	"code.google.com/p/go.net/html"
 	"fmt"
+	"github.com/ericchiang/pup/funcs"
 	"github.com/ericchiang/pup/selector"
 	"io"
 	"os"
@@ -14,11 +15,13 @@ const VERSION string = "0.1.0"
 
 var (
 	// Flags
+	attributes    []string        = []string{}
 	inputStream   io.ReadCloser   = os.Stdin
 	indentString  string          = " "
 	maxPrintLevel int             = -1
 	printNumber   bool            = false
 	printColor    bool            = false
+	displayer     funcs.Displayer = nil
 )
 
 // Print to stderr and exit
@@ -64,6 +67,9 @@ func ProcessFlags(cmds []string) []string {
 	for i = 0; i < len(cmds); i++ {
 		cmd := cmds[i]
 		switch cmd {
+		case "-a", "--attr":
+			attributes = append(attributes, cmds[i+1])
+			i++
 		case "-c", "--color":
 			printColor = true
 		case "-f", "--file":
@@ -121,6 +127,14 @@ func main() {
 	}
 	selectors := make([]*selector.Selector, len(cmds))
 	for i, cmd := range cmds {
+		if i+1 == len(cmds) {
+			d, err := funcs.NewDisplayFunc(cmd)
+			if err == nil {
+				displayer = d
+				selectors = selectors[0 : len(cmds)-1]
+				break
+			}
+		}
 		selectors[i], err = selector.NewSelector(cmd)
 		if err != nil {
 			Fatal("Selector parse error: %s", err)
@@ -136,7 +150,9 @@ func main() {
 		}
 		currNodes = selected
 	}
-	if printNumber {
+	if displayer != nil {
+		displayer.Display(currNodes)
+	} else if printNumber {
 		fmt.Println(len(currNodes))
 	} else {
 		for _, s := range currNodes {

printing.go

@@ -17,8 +17,8 @@ var (
 
 	// Regexp helpers
 	whitespaceRegexp *regexp.Regexp = regexp.MustCompile(`^\s*$`)
-	preWhitespace    *regexp.Regexp = regexp.MustCompile(`^\s+`)
-	postWhitespace   *regexp.Regexp = regexp.MustCompile(`\s+$`)
+	preWhitespace                   = regexp.MustCompile(`^\s+`)
+	postWhitespace                  = regexp.MustCompile(`\s+$`)
 )
 
 func printIndent(level int) {