From 54ef86c46effd3a9b9ea7291c407d6b2383c9d24 Mon Sep 17 00:00:00 2001
From: Philippe Caseiro <pcaseiro@cadoles.com>
Date: Fri, 11 Mar 2022 10:39:07 +0100
Subject: [PATCH] fix(template): fix go txt/template support

We can parse go text/template again.
---
 main.go | 54 +++++++++++++++++++++++++++++++++++-------------------
 1 file changed, 35 insertions(+), 19 deletions(-)

diff --git a/main.go b/main.go
index 8e16cbd..b32edde 100644
--- a/main.go
+++ b/main.go
@@ -1,15 +1,14 @@
 package main
 
 import (
+	encjson "encoding/json"
 	"fmt"
 	"os"
-	"encoding/json"
 	"text/template"
-	//"github.com/hashicorp/hcl2/gohcl"
+
 	"github.com/hashicorp/hcl/v2"
 	"github.com/hashicorp/hcl/v2/hclsyntax"
-	//"github.com/zclconf/go-cty/cty"
-	//"github.com/zclconf/go-cty/cty/gocty"
+	"github.com/zclconf/go-cty/cty"
 	ctyjson "github.com/zclconf/go-cty/cty/json"
 )
 
@@ -19,40 +18,58 @@ func checkErr(e error) {
 	}
 }
 
+func checkDiags(diag hcl.Diagnostics) {
+	if diag.HasErrors() {
+		panic(diag.Error())
+	}
+}
+
 func processGoTemplate(file string, config []byte) {
 
 	// The JSON configuration
 	var confData map[string]interface{}
-	err := json.Unmarshal(config, &confData)
+	err := encjson.Unmarshal(config, &confData)
 	checkErr(err)
 
 	// Read the template
 	data, err := os.ReadFile(file)
 	checkErr(err)
 
-
 	tpl, err := template.New("conf").Parse(string(data))
 	checkErr(err)
 
-	checkErr(tpl.Execute(os.Stdout,config))
+	checkErr(tpl.Execute(os.Stdout, confData))
 
 }
 
 func processHCLTemplate(file string, config []byte) {
 
-	fct, err:= os.ReadFile(file)
+	fct, err := os.ReadFile(file)
 	checkErr(err)
 
-	expr, diags := hclsyntax.ParseTemplate(fct, file, hcl.Pos{Line:1, Column: 1})
-	if diags.HasErrors() {
-		panic(diags.Error())
+	expr, diags := hclsyntax.ParseTemplate(fct, file, hcl.Pos{Line: 1, Column: 1})
+	checkDiags(diags)
+
+	// Retrieve values from JSON
+	var varsVal cty.Value
+	ctyType, err := ctyjson.ImpliedType(config)
+	if err != nil {
+		panic(err)
+		/* Maybe one day
+		cexpr, diags := hclsyntax.ParseExpression(config, "", hcl.Pos{Line: 1, Column: 1})
+		if diags.HasErrors() {
+			panic(diags.Error())
+		}
+		varsVal, diags = cexpr.Value(&hcl.EvalContext{})
+		fmt.Println(cexpr.Variables())
+		checkDiags(diags)
+		*/
+	} else {
+		varsVal, err = ctyjson.Unmarshal(config, ctyType)
+		checkErr(err)
 	}
 
-	ctyType, err := ctyjson.ImpliedType(config)
-	checkErr(err)
-	varsVal, err := ctyjson.Unmarshal(config,ctyType)
-	checkErr(err)
-
+	fmt.Println(varsVal.AsValueMap())
 	ctx := &hcl.EvalContext{
 		Variables: varsVal.AsValueMap(),
 	}
@@ -75,7 +92,7 @@ func processHCLTemplate(file string, config []byte) {
 		panic(diags.Error())
 	}
 
-	fmt.Printf("%s",val.AsString())
+	fmt.Printf("%s", val.AsString())
 }
 
 func main() {
@@ -84,7 +101,6 @@ func main() {
 	templateFile := os.Args[2]
 	config := []byte(os.Args[3])
 
-
 	if templateType == "go" {
 		processGoTemplate(templateFile, config)
 	} else if templateType == "hcl" {
@@ -92,4 +108,4 @@ func main() {
 	} else {
 		panic(fmt.Errorf("Unsupported template type"))
 	}
-}
\ No newline at end of file
+}