etude for golang

docdami.go

package docdami

import (
  "io/ioutil"
  "log"
  "fmt"
  "github.com/lestrrat/go-xslate"
)

type Docdami struct {
  Xslate *xslate.Xslate
}

func New () (*Docdami, error) {
  xt, err := xslate.New();
  if err != nil {
    log.Fatalf("Failed to create xslate: %s", err)
  }

  d := &Docdami{
    Xslate: xt,
  }
  return d, nil
}

func (d *Docdami) Run (file string) (string, error) {
  tmpl, err := ioutil.ReadFile(file);
  if err != nil {
    log.Fatalf("Failed to read a file: %s", err)
  }

  output, err := d.Xslate.RenderString(string(tmpl), xslate.Vars { "name": "Docdami" })
  if err != nil {
    log.Fatalf("Failed to render template: %s", err)
  }

  str := fmt.Sprintf("%s", output)
  
  return str, err
}

foo.tt

Hello, [% name %] World!

run_test.go

package docdami

import (
  "testing"
)

func TestRun(t *testing.T) {
  d, err := New()
  if err != nil {
    t.Errorf("caught error : %s", err);
  }

  str, err := d.Run("foo.tt")
  expected := "Hello, Docdami World!\n"

  if err != nil {
    t.Errorf("caught error : %s", err);
  }

  if str != expected {
    t.Errorf("got %s\nwant %s", str, expected);
  }
}