Move templating functionality into its own package from Levant pkg

Closes #171

command/deploy.go

@@ -10,6 +10,7 @@ import (
 	"github.com/jrasell/levant/levant"
 	"github.com/jrasell/levant/levant/structs"
 	"github.com/jrasell/levant/logging"
+	"github.com/jrasell/levant/template"
 )
 
 // DeployCommand is the command implementation that allows users to deploy a
@@ -109,7 +110,7 @@ func (c *DeployCommand) Run(args []string) int {
 		return 1
 	}
 
-	config.Job, err = levant.RenderJob(config.TemplateFile, config.VaiableFile, &c.Meta.flagVars)
+	config.Job, err = template.RenderJob(config.TemplateFile, config.VaiableFile, &c.Meta.flagVars)
 	if err != nil {
 		c.UI.Error(fmt.Sprintf("[ERROR] levant/command: %v", err))
 		return 1

command/deploy_test.go

@@ -3,7 +3,7 @@ package command
 import (
 	"testing"
 
-	"github.com/jrasell/levant/levant"
+	"github.com/jrasell/levant/template"
 )
 
 func TestDeploy_checkCanaryAutoPromote(t *testing.T) {
@@ -30,7 +30,7 @@ func TestDeploy_checkCanaryAutoPromote(t *testing.T) {
 	}
 
 	for i, c := range cases {
-		job, err := levant.RenderJob(c.File, "", &fVars)
+		job, err := template.RenderJob(c.File, "", &fVars)
 		if err != nil {
 			t.Fatalf("case %d failed: %v", i, err)
 		}
@@ -61,7 +61,7 @@ func TestDeploy_checkForceBatch(t *testing.T) {
 	}
 
 	for i, c := range cases {
-		job, err := levant.RenderJob(c.File, "", &fVars)
+		job, err := template.RenderJob(c.File, "", &fVars)
 		if err != nil {
 			t.Fatalf("case %d failed: %v", i, err)
 		}

command/render.go

@@ -7,7 +7,7 @@ import (
 	"strings"
 
 	"github.com/jrasell/levant/helper"
-	"github.com/jrasell/levant/levant"
+	"github.com/jrasell/levant/template"
 )
 
 // RenderCommand is the command implementation that allows users to render a
@@ -78,7 +78,7 @@ func (c *RenderCommand) Run(args []string) int {
 		return 1
 	}
 
-	tpl, err = levant.RenderTemplate(templateFile, variables, &c.Meta.flagVars)
+	tpl, err = template.RenderTemplate(templateFile, variables, &c.Meta.flagVars)
 	if err != nil {
 		c.UI.Error(fmt.Sprintf("[ERROR] levant/command: %v", err))
 		return 1

levant/templater.go → template/render.go

@@ -1,11 +1,10 @@
-package levant
+package template
 
 import (
 	"bytes"
 	"fmt"
 	"io/ioutil"
 	"path"
-	"text/template"
 
 	"github.com/jrasell/levant/helper"
 	"github.com/rs/zerolog/log"
@@ -16,12 +15,6 @@ import (
 	"github.com/hashicorp/terraform/config"
 )
 
-const (
-	terraformVarExtension = ".tf"
-	yamlVarExtension      = ".yaml"
-	ymlVarExtension       = ".yml"
-)
-
 // RenderJob takes in a template and variables performing a render of the
 // template followed by Nomad jobspec parse.
 func RenderJob(templateFile, variableFile string, flagVars *map[string]string) (job *nomad.Job, err error) {
@@ -39,17 +32,17 @@ func RenderJob(templateFile, variableFile string, flagVars *map[string]string) (
 // passed variables file.
 func RenderTemplate(templateFile, variableFile string, flagVars *map[string]string) (tpl *bytes.Buffer, err error) {
 	if variableFile == "" {
-		log.Debug().Msgf("levant/templater: no variable file passed, trying defaults")
+		log.Debug().Msgf("template/render: no variable file passed, trying defaults")
 		if variableFile = helper.GetDefaultVarFile(); variableFile != "" {
-			log.Debug().Msgf("levant/templater: found default variable file, using %s", variableFile)
+			log.Debug().Msgf("template/render: found default variable file, using %s", variableFile)
 		}
 	}
 
 	// Process the variable file extension and log DEBUG so the template can be
 	// correctly rendered.
 	var ext string
 	if ext = path.Ext(variableFile); ext != "" {
-		log.Debug().Msgf("levant/templater: variable file extension %s detected", ext)
+		log.Debug().Msgf("template/render: variable file extension %s detected", ext)
 	}
 
 	src, err := ioutil.ReadFile(templateFile)
@@ -60,7 +53,7 @@ func RenderTemplate(templateFile, variableFile string, flagVars *map[string]stri
 	// If no command line variables are passed; log this as DEBUG to provide much
 	// greater feedback.
 	if len(*flagVars) == 0 {
-		log.Debug().Msgf("levant/templater: no command line variables passed")
+		log.Debug().Msgf("template/render: no command line variables passed")
 	}
 
 	switch ext {
@@ -73,7 +66,7 @@ func RenderTemplate(templateFile, variableFile string, flagVars *map[string]stri
 
 	case "":
 		// No variables file passed; render using any passed CLI variables.
-		log.Debug().Msgf("levant/templater: variable file not passed")
+		log.Debug().Msgf("template/render: variable file not passed")
 		tpl, err = readJobFile(string(src), flagVars)
 
 	default:
@@ -166,8 +159,3 @@ func readJobFile(src string, flagVars *map[string]string) (tpl *bytes.Buffer, er
 
 	return tpl, nil
 }
-
-// newTemplate returns an empty template with default options set
-func newTemplate() *template.Template {
-	return template.New("jobTemplate").Delims("[[", "]]").Option("missingkey=error")
-}

levant/templater_test.go → template/render_test.go

@@ -1,4 +1,4 @@
-package levant
+package template
 
 import (
 	"strings"

template/template.go

@@ -0,0 +1,16 @@
+package template
+
+import (
+	"text/template"
+)
+
+const (
+	terraformVarExtension = ".tf"
+	yamlVarExtension      = ".yaml"
+	ymlVarExtension       = ".yml"
+)
+
+// newTemplate returns an empty template with default options set
+func newTemplate() *template.Template {
+	return template.New("jobTemplate").Delims("[[", "]]").Option("missingkey=error")
+}