Add a chomp function.

- Mostly useful in pipelines.

diff --git a/docs/content/templates/functions.md b/docs/content/templates/functions.md
index 4138ffde9caf4e926a33dcce5a663241c4f25c29..b0fa0d9ed73b42964c02a5de69103b994280e901 100644 (file)
--- a/docs/content/templates/functions.md
+++ b/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

diff --git a/tpl/template.go b/tpl/template.go
index 197703a73d0b1a08375410694739952efd35bab1..ef0096ceff36cc9dbeb09dbdf31ab7e4f5f07945 100644 (file)
--- a/tpl/template.go
+++ b/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]+$")
 }