Add Sprig Templating (#553)

* Add Sprig Templating

* Update docs/manual.md

Co-Authored-By: Ahmed Elsabbahy <aelsabbahy@users.noreply.github.com>

* Update docs/manual.md

Co-Authored-By: Ahmed Elsabbahy <aelsabbahy@users.noreply.github.com>

Co-authored-by: Ahmed Elsabbahy <aelsabbahy@users.noreply.github.com>

docs/manual.md

@@ -898,22 +898,26 @@ For more information see:
 
 ## Templates
 
-Goss test files can leverage golang's [text/template](https://golang.org/pkg/text/template/) to allow for dynamic or conditional tests.
+Goss test files can leverage golang's [text/template](https://golang.org/pkg/text/template/) to allow for dynamic or conditional tests. 
 
 Available variables:
 * `{{.Env}}`  - Containing environment variables
 * `{{.Vars}}` - Containing the values defined in [--vars](#global-options) file
 
-Available functions beyond text/template [built-in functions](https://golang.org/pkg/text/template/#hdr-Functions):
-* `mkSlice "ARG1" "ARG2"` - Retuns a slice of all the arguments. See examples below for usage.
-* `getEnv "var" ["default"]` - A more forgiving env var lookup. If key is missing either "" or default (if provided) is returned.
-* `readFile "fileName"` - Reads file content into a string, trims whitespace. Useful when a file contains a token.
-  * **NOTE:** Goss will error out during during the parsing phase if the file does not exist, no tests will be executed.
-* `regexMatch "(some)?reg[eE]xp"` - Tests the piped input against the regular expression argument.
-* `toLower` - Changes piped input to lowercase
-* `toUpper` - Changes piped input to UPPERCASE
+Available functions:
+* [built-in text/template functions](https://golang.org/pkg/text/template/#hdr-Functions)
+* [Sprig functions](https://masterminds.github.io/sprig/)
+* Custom functions:
+  * `mkSlice "ARG1" "ARG2"` - Returns a slice of all the arguments. See examples below for usage.
+  * `getEnv "var" ["default"]` - A more forgiving env var lookup. If key is missing either "" or default (if provided) is returned.
+  * `readFile "fileName"` - Reads file content into a string, trims whitespace. Useful when a file contains a token.
+    * **NOTE:** Goss will error out during during the parsing phase if the file does not exist, no tests will be executed.
+  * `regexMatch "(some)?reg[eE]xp"` - Tests the piped input against the regular expression argument.
+  * `toLower` - Changes piped input to lowercase
+  * `toUpper` - Changes piped input to UPPERCASE
 
 **NOTE:** gossfiles containing text/template `{{}}` controls will no longer work with `goss add/autoadd`. One way to get around this is to split your template and static goss files and use [gossfile](#gossfile) to import.
+**NOTE:** Some of Sprig functions have the same name as the older Custom Goss functions. The Sprig functions are overwritten by the custom functions for backwards compatibility.
 
 ### Examples
 
@@ -936,6 +940,15 @@ file:
 {{end}}
 ```
 
+Using `upper` function from Sprig.
+```yaml
+matching:
+  sping_basic:
+    content: {{ "hello!" | upper | repeat 5 }}
+    matches:
+      match-regexp: "HELLO!HELLO!HELLO!HELLO!HELLO!"
+```
+
 Using Env variables and a vars file:
 
 **vars.yaml:**

go.mod

@@ -1,32 +1,28 @@
 module github.com/aelsabbahy/goss
 
 require (
+	github.com/Masterminds/goutils v1.1.0 // indirect
+	github.com/Masterminds/semver v1.5.0 // indirect
+	github.com/Masterminds/sprig v2.22.0+incompatible
 	github.com/achanda/go-sysctl v0.0.0-20160222034550-6be7678c45d2
 	github.com/aelsabbahy/GOnetstat v0.0.0-20160428114218-edf89f784e08
 	github.com/aelsabbahy/go-ps v0.0.0-20170721000941-443386855ca1
 	github.com/blang/semver v3.5.1+incompatible
-	github.com/cheekybits/genny v0.0.0-20160824153601-e8e29e67948b
-	github.com/docker/docker v0.0.0-20161109014415-383a2f046b16
-	github.com/fatih/color v0.0.0-20161025120501-bf82308e8c85
-	github.com/fsnotify/fsnotify v1.4.7 // indirect
-	github.com/golang/protobuf v1.3.2 // indirect
-	github.com/hpcloud/tail v1.0.0 // indirect
-	github.com/kr/pretty v0.1.0 // indirect
-	github.com/mattn/go-colorable v0.0.9 // indirect
-	github.com/mattn/go-isatty v0.0.4 // indirect
-	github.com/miekg/dns v0.0.0-20161018060808-58f52c57ce9d
+	github.com/cheekybits/genny v1.0.0
+	github.com/docker/docker v1.13.1
+	github.com/fatih/color v1.9.0
+	github.com/google/uuid v1.1.1 // indirect
+	github.com/huandu/xstrings v1.3.0 // indirect
+	github.com/imdario/mergo v0.3.8 // indirect
+	github.com/miekg/dns v1.1.27
+	github.com/mitchellh/copystructure v1.0.0 // indirect
 	github.com/oleiade/reflections v0.0.0-20160817071559-0e86b3c98b2f
-	github.com/onsi/ginkgo v1.10.2 // indirect
-	github.com/onsi/gomega v0.0.0-20161031154339-ff4bc6b6f9f5
+	github.com/onsi/gomega v1.9.0
 	github.com/opencontainers/runc v0.0.0-20161107232042-8779fa57eb4a
-	github.com/patrickmn/go-cache v2.0.0+incompatible
+	github.com/patrickmn/go-cache v2.1.0+incompatible
 	github.com/stretchr/testify v1.4.0
 	github.com/urfave/cli v0.0.0-20161102131801-d86a009f5e13
-	golang.org/x/sys v0.0.0-20181210030007-2a47403f2ae5 // indirect
-	gopkg.in/check.v1 v1.0.0-20190902080502-41f04d3bba15 // indirect
-	gopkg.in/fsnotify.v1 v1.4.7 // indirect
-	gopkg.in/tomb.v1 v1.0.0-20141024135613-dd632973f1e7 // indirect
-	gopkg.in/yaml.v2 v2.2.2
+	gopkg.in/yaml.v2 v2.2.8
 )
 
 go 1.13

go.sum

@@ -1,3 +1,9 @@
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+golang.org/x/sync v0.0.0-20190423024810-112230192c58 h1:8gQV6CLnAEikrhgkHFbMAEhagSSnXWGV915qUMm9mrU=
+golang.org/x/sync v0.0.0-20190423024810-112230192c58/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
+golang.org/x/sys v0.0.0-20180909124046-d0be0721c37e/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
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+gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405 h1:yhCVgyC4o1eVCa2tZl7eS0r+SDo693bJlVdllGtEeKM=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
-gopkg.in/check.v1 v1.0.0-20190902080502-41f04d3bba15 h1:YR8cESwS4TdDjEe65xsg0ogRM/Nc3DYOhEAlW+xobZo=
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+gopkg.in/yaml.v2 v2.2.4/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
+gopkg.in/yaml.v2 v2.2.8 h1:obN1ZagJSUGI0Ek/LBmuj4SNLPfIny3KsKFopxRdj10=
+gopkg.in/yaml.v2 v2.2.8/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=

integration-tests/goss/goss-shared.yaml

@@ -249,3 +249,7 @@ matching:
     content: {{ .Vars.overwrite }}
     matches:
       match-regexp: bar
+  sping_basic:
+    content: {{ "hello!" | upper | repeat 5 }}
+    matches:
+      match-regexp: "HELLO!HELLO!HELLO!HELLO!HELLO!"

integration-tests/test.sh

@@ -45,9 +45,9 @@ out=$(docker_exec "/goss/$os/goss-linux-$arch" --vars "/goss/vars.yaml" --vars-i
 echo "$out"
 
 if [[ $os == "arch" ]]; then
-    egrep -q 'Count: 90, Failed: 0, Skipped: 3' <<<"$out"
+    egrep -q 'Count: 91, Failed: 0, Skipped: 3' <<<"$out"
 else
-    egrep -q 'Count: 109, Failed: 0, Skipped: 5' <<<"$out"
+    egrep -q 'Count: 110, Failed: 0, Skipped: 5' <<<"$out"
 fi
 
 if [[ ! $os == "arch" ]]; then

template.go

@@ -8,6 +8,8 @@ import (
 	"regexp"
 	"strings"
 	"text/template"
+
+	"github.com/Masterminds/sprig"
 )
 
 // TemplateFilter is the type of the Goss Template Filter which include custom variables and functions.
@@ -23,8 +25,7 @@ func NewTemplateFilter(varsFile string, varsInline string) (func([]byte) ([]byte
 	tVars := &TmplVars{Vars: vars}
 
 	f := func(data []byte) ([]byte, error) {
-		funcMap := funcMap
-		t := template.New("test").Funcs(template.FuncMap(funcMap))
+		t := template.New("test").Funcs(sprig.TxtFuncMap()).Funcs(funcMap)
 
 		tmpl, err := t.Parse(string(data))
 		if err != nil {