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tpl: Add a querify function to generate query strings inside templates

The query function will take a set of parameters specified like a dict and return a url.Values object which can be .Encode'd into a query string.

Example:

<a href="http://www.google.com?{{ (querify "q" "test" "page" 3).Encode | safeHTML }}">Search</a>

Returns:

<a href="http://www.google.com?page=3&q=test">Search</a>

Closes #2257

--- a/tpl/template_funcs.go

+++ b/tpl/template_funcs.go

@@ -27,6 +27,7 @@

 	"html"

 	"html/template"

 	"math/rand"

+	"net/url"

 	"os"

 	"reflect"

 	"regexp"

@@ -1745,6 +1746,21 @@

 	return hex.EncodeToString(hash[:]), nil

 }

+// querify converts the given parameters into a url.Values object

+func querify(params ...interface{}) (url.Values, error) {

+	qs := url.Values{}

+	vals, err := dictionary(params...)

+	if err != nil {

+		return url.Values{}, fmt.Errorf("querify keys must be strings")

+	}

+

+	for name, value := range vals {

+		qs.Add(name, url.QueryEscape(fmt.Sprintf("%v", value)))

+	}

+

+	return qs, nil

+}

+

 func init() {

 	funcMap = template.FuncMap{

 		"absURL":       func(a string) template.HTML { return template.HTML(helpers.AbsURL(a)) },

@@ -1794,6 +1810,7 @@

 		"partial":      partial,

 		"plainify":     plainify,

 		"pluralize":    pluralize,

+		"querify":      querify,

 		"readDir":      readDirFromWorkingDir,

 		"readFile":     readFileFromWorkingDir,

 		"ref":          ref,

--- a/tpl/template_funcs_test.go

+++ b/tpl/template_funcs_test.go

@@ -103,6 +103,7 @@

 mul: {{mul 2 3}}

 plainify: {{ plainify  "Hello <strong>world</strong>, gophers!" }}

 pluralize: {{ "cat" | pluralize }}

+querify: {{ (querify "foo" 1 "bar" 2 "baz" "with spaces").Encode | safeHTML }}

 readDir: {{ range (readDir ".") }}{{ .Name }}{{ end }}

 readFile: {{ readFile "README.txt" }}

 relURL 1: {{ "http://gohugo.io/" | relURL }}

@@ -154,6 +155,7 @@

 mul: 6

 plainify: Hello world, gophers!

 pluralize: cats

+querify: bar=2&baz=with%2Bspaces&foo=1

 readDir: README.txt

 readFile: Hugo Rocks!

 relURL 1: http://gohugo.io/