template functions: add sprig template library v3

README.md

@@ -1246,6 +1246,8 @@ The content of the request and response file are execatly the same as if you wou
 
 # Template functions
 
+> **apitest** supports the [Sprig template](http://masterminds.github.io/sprig/) function library in v3. Internally provided functions like `add` overwrite the `Sprig` function.
+
 As described before, if you use an external file you can make use of so called template functions. What they are and how they work for the apitesting tool is described in the following part.
 
 Template Functions are invoked using the tags `{{ }}` and upon returning substitutes the function call with

go.mod

@@ -3,9 +3,13 @@ module github.com/programmfabrik/apitest
 go 1.13
 
 require (
+	github.com/Masterminds/sprig/v3 v3.2.2
 	github.com/clbanning/mxj v1.8.4
 	github.com/fsnotify/fsnotify v1.5.1 // indirect
+	github.com/huandu/xstrings v1.3.2 // indirect
+	github.com/imdario/mergo v0.3.12 // indirect
 	github.com/mattn/go-sqlite3 v1.14.8
+	github.com/mitchellh/copystructure v1.2.0 // indirect
 	github.com/moul/http2curl v1.0.0
 	github.com/pkg/errors v0.9.1
 	github.com/programmfabrik/go-test-utils v0.0.0-20191114143449-b8e16b04adb1

pkg/lib/template/template_loader.go

@@ -15,6 +15,7 @@ import (
 	"strings"
 	"text/template"
 
+	"github.com/Masterminds/sprig/v3"
 	"github.com/pkg/errors"
 	"github.com/programmfabrik/apitest/pkg/lib/datastore"
 	"golang.org/x/mod/semver"
@@ -445,6 +446,7 @@ func (loader *Loader) Render(
 	tmpl, err := template.
 		New("tmpl").
 		Delims(loader.Delimiters.Left, loader.Delimiters.Right).
+		Funcs(sprig.TxtFuncMap()).
 		Funcs(funcMap).
 		Parse(string(tmplBytes))
 	if err != nil {