Feature/support env hcl and interpolations (#1423)

* support HCL language for env variables

Signed-off-by: xtphate <65117176+XT-Phate@users.noreply.github.com>

test/e2e/template/helmfile/testdata/snapshot/hcl_mix/config.yaml

@@ -0,0 +1,4 @@
+helmfileArgs:
+- template
+- --concurrency=1
+- -q

test/e2e/template/helmfile/testdata/snapshot/hcl_mix/input.yaml

@@ -0,0 +1,38 @@
+environments:
+  default:
+    values:
+      - values1.hcl
+      - values1.yaml
+      - values2.hcl
+---
+
+helmDefaults:
+  kubeContext: minikube
+
+releases:
+
+  - name: hcl-demo
+    chart: ../../charts/raw-0.1.0
+    values:
+    - templates:
+      - |
+        apiVersion: v1
+        kind: ConfigMap
+        metadata:
+          name: configmap
+        data:
+          a: {{ .Values.a }}
+          b: {{ .Values.b }}
+          c: {{ .Values.c }}
+          crossfile: {{ .Values.crossfile }}
+          expressionInText: "{{ .Values.expressionInText }}"
+          fromMap: {{ .Values.fromMap }}
+          insideFor: {{ .Values.insideFor }}
+          list: "{{ .Values.list }}"
+          {{- .Values.locals | toYaml | nindent 10 -}}
+          multiBlock: {{ .Values.multiBlock }}
+          simpleCompute: "{{ .Values.simpleCompute }}"
+          yamlOverride: {{ .Values.yamlOverride }}
+
+
+

test/e2e/template/helmfile/testdata/snapshot/hcl_mix/output.yaml

@@ -0,0 +1,20 @@
+---
+# Source: raw/templates/resources.yaml
+apiVersion: v1
+kind: ConfigMap
+metadata:
+  name: configmap
+data:
+  a: a
+  b: b
+  c: ab
+  crossfile: values2.hcl
+  expressionInText: "yes"
+  fromMap: ab
+  insideFor: b
+  list: "[b]"
+  filename: values1.hcl
+  multiBlock: block
+  simpleCompute: "4"
+  yamlOverride: yaml_overrode
+

test/e2e/template/helmfile/testdata/snapshot/hcl_mix/values1.hcl

@@ -0,0 +1,53 @@
+locals {
+  filename = "values1.hcl"
+}
+
+values {
+  a = "a"
+  b = "b"
+  c = "${hv.a}${hv.b}"
+
+  list = [
+    hv.b
+  ]
+
+  locals = local
+
+  // Maps and some functions
+  nestedmap = {
+    submap = {
+      subsubmap = {
+        hello = hv.a
+      }
+    }
+  }
+
+  nestedmap2 = {
+    submap = {
+      subsubmap = {
+        hello = hv.c
+      }
+    }
+  }
+
+  merged = merge(hv.nestedmap, hv.nestedmap2)
+  fromMap = "${hv.merged.submap.subsubmap.hello}"
+
+  // precedence demo
+  yamlOverride = "yaml_overrode"
+
+
+  // Simple Expressions
+  ternary = true ? true : false
+  expressionInText = "%{if hv.ternary }yes%{else}no%{endif}"
+  insideFor = "%{for i in hv.list }${i}%{endfor}"
+  simpleCompute = 2 + 2
+
+  multiBlock = hv.block
+
+  crossfile = hv.crossfile_var
+}
+
+values {
+  block = "block"
+}

test/e2e/template/helmfile/testdata/snapshot/hcl_mix/values1.yaml

@@ -0,0 +1 @@
+yamlOverride: "will_be_overriden"

test/e2e/template/helmfile/testdata/snapshot/hcl_mix/values2.hcl

@@ -0,0 +1,7 @@
+locals {
+  filename = "values2.hcl"
+}
+
+values {
+  crossfile_var = local.filename
+}