tpl: Add template function namespaces

This commit moves almost all of the template functions into separate
packages under tpl/ and adds a namespace framework.  All changes should
be backward compatible for end users, as all existing function names in
the template funcMap are left intact.

Seq and DoArithmatic have been moved out of the helpers package and into
template namespaces.

Most of the tests involved have been refactored, and many new tests have
been written.  There's still work to do, but this is a big improvement.

I got a little overzealous and added some new functions along the way:

- strings.Contains
- strings.ContainsAny
- strings.HasSuffix
- strings.TrimPrefix
- strings.TrimSuffix

Documentation is forthcoming.

Fixes #3042

1 files changed, 3 insertions, 2 deletions

diff --git a/hugolib/scratch.go b/hugolib/scratch.go
index b6a06cd79..4a80416f1 100644
--- a/hugolib/scratch.go
+++ b/hugolib/scratch.go
@@ -14,10 +14,11 @@
 package hugolib
 
 import (
-	"github.com/spf13/hugo/helpers"
 	"reflect"
 	"sort"
 	"sync"
+
+	"github.com/spf13/hugo/tpl/math"
 )
 
 // Scratch is a writable context used for stateful operations in Page/Node rendering.
@@ -49,7 +50,7 @@ func (c *Scratch) Add(key string, newAddend interface{}) (string, error) {
 				newVal = reflect.Append(addendV, nav).Interface()
 			}
 		} else {
-			newVal, err = helpers.DoArithmetic(existingAddend, newAddend, '+')
+			newVal, err = math.DoArithmetic(existingAddend, newAddend, '+')
 			if err != nil {
 				return "", err
 			}