Add a chomp function.

- Mostly useful in pipelines.

docs/content/templates/functions.md

@@ -252,6 +252,11 @@ Convert all characters in string to titlecase.
 
 e.g. `{{title "BatMan"}}` → "Batman"
 
+### chomp
+Removes any trailing newline characters. Useful in a pipeline to remove newlines added by other processing (including `markdownify`).
+
+e.g., `{{chomp "<p>Blockhead</p>\n"` → `"<p>Blockhead</p>"`
+
 ### highlight
 Take a string of code and a language, uses Pygments to return the syntax
 highlighted code in HTML. Used in the [highlight

tpl/template.go

@@ -29,6 +29,7 @@ import (
 	"os"
 	"path/filepath"
 	"reflect"
+	"regexp"
 	"sort"
 	"strconv"
 	"strings"
@@ -37,6 +38,7 @@ import (
 var localTemplates *template.Template
 var tmpl Template
 var funcMap template.FuncMap
+var chompRegexp *regexp.Regexp
 
 type Template interface {
 	ExecuteTemplate(wr io.Writer, name string, data interface{}) error
@@ -667,6 +669,15 @@ func RelRef(page interface{}, ref string) template.HTML {
 	return refPage(page, ref, "RelRef")
 }
 
+func Chomp(text interface{}) (string, error) {
+	s, err := cast.ToStringE(text)
+	if err != nil {
+		return "", err
+	}
+
+	return chompRegexp.ReplaceAllString(s, ""), nil
+}
+
 func SafeHtml(text string) template.HTML {
 	return template.HTML(text)
 }
@@ -1022,5 +1033,8 @@ func init() {
 		"partial":     Partial,
 		"ref":         Ref,
 		"relref":      RelRef,
+		"chomp":       Chomp,
 	}
+
+	chompRegexp = regexp.MustCompile("[\r\n]+$")
 }