parse template function

Author: pjdufour

README.md

@@ -4,7 +4,7 @@
 
 # Description
 
-**gotmpl** is a super simple command line program for rendering templates.  **gotmpl** uses environment variables as its context and [go-adaptive-functions](https://github.com/spatialcurrent/go-adaptive-functions) for its functions.
+**gotmpl** is a super simple command line program for rendering templates.  **gotmpl** uses environment variables as its context and [go-adaptive-functions](https://github.com/spatialcurrent/go-adaptive-functions) for its functions.  **gotmpl** uses [go-simple-serializer](https://github.com/spatialcurrent/go-simple-serializer) for parsing text into data, such as in the "Render Time Table" example below.
 
 # Installation
 
@@ -32,6 +32,12 @@ echo '{{ split .SHELL "/" | last }}' | gotmpl
 echo '{{ .PATH | split ":" | set | array | sort | join ":" }}' | gotmpl
 ```
 
+**Render Time Table**
+
+```shell
+echo '{{ with $items := .data | parse "csv" }}<table style="text-align:left;font-size:16px;"><tr><th>Time</th><th>Title</th>{{ range $items }}<tr><td>{{ .Time }}</td><td>{{ .Title }}</td></tr>{{ end }}</table>{{ end }}' | data=$(cat timetable.csv) gotmpl
+```
+
 # Contributing
 
 [Spatial Current, Inc.](https://spatialcurrent.io) is currently accepting pull requests for this repository.  We'd love to have your contributions!  Please see [Contributing.md](https://github.com/spatialcurrent/gotmpl/blob/master/CONTRIBUTING.md) for how to get started.

main.go

@@ -15,8 +15,13 @@ import (
 	"text/template"
 )
 
+import (
+	"github.com/pkg/errors"
+)
+
 import (
 	"github.com/spatialcurrent/go-adaptive-functions/af"
+	"github.com/spatialcurrent/go-simple-serializer/gss"
 )
 
 func main() {
@@ -43,7 +48,33 @@ func main() {
 		ctx[parts[0]] = parts[1]
 	}
 
-	funcs := map[string]interface{}{}
+	funcs := map[string]interface{}{
+		"parse": func(args ...interface{}) (interface{}, error) {
+			if len(args) != 2 {
+				return nil, errors.New("invalid arguments for parse " + fmt.Sprint(args))
+			}
+			if text, ok := args[1].(string); ok {
+				if f, ok := args[0].(string); ok {
+					t, err := gss.GetType([]byte(text), f)
+					if err != nil {
+						return "", errors.Wrap(err, "error creating new object for format "+f)
+					}
+					return gss.DeserializeString(
+						text,
+						f,
+						gss.NoHeader,
+						gss.NoComment,
+						true,
+						0,
+						gss.NoLimit,
+						t,
+						false,
+						false)
+				}
+			}
+			return nil, errors.New("invalid arguments for parse " + fmt.Sprint(args))
+		},
+	}
 	for _, f := range af.Functions {
 		f := f
 		for _, alias := range f.Aliases {