Add basic module support for variable completion

.gitignore

@@ -7,3 +7,4 @@ internal/schemas/*log*
 internal/schemas/providers.tf
 internal/schemas/schemas_gen.go
 internal/schemas/data/
+terraform-ls

.vscode/launch.json

@@ -0,0 +1,20 @@
+{
+    // Use IntelliSense to learn about possible attributes.
+    // Hover to view descriptions of existing attributes.
+    // For more information, visit: https://go.microsoft.com/fwlink/?linkid=830387
+    "version": "0.2.0",
+    "configurations": [
+        {
+            "name": "Debug Server",
+            "type": "go",
+            "request": "launch",
+            "mode": "auto",
+            "program": "${workspaceFolder}",
+            "args": [
+                "serve",
+                "--port",
+                "30337"
+            ]
+        }
+    ]
+}

go.mod

@@ -17,7 +17,7 @@ require (
 	github.com/hashicorp/terraform-exec v0.14.0
 	github.com/hashicorp/terraform-json v0.12.0
 	github.com/hashicorp/terraform-registry-address v0.0.0-20210412075316-9b2996cce896
-	github.com/hashicorp/terraform-schema v0.0.0-20210617130010-ab6887832578
+	github.com/hashicorp/terraform-schema v0.0.0-20210722111916-2c53a3129d11
 	github.com/kylelemons/godebug v1.1.0 // indirect
 	github.com/mh-cbon/go-fmt-fail v0.0.0-20160815164508-67765b3fbcb5
 	github.com/mitchellh/cli v1.1.2

go.sum

@@ -202,13 +202,12 @@ github.com/hashicorp/memberlist v0.1.3/go.mod h1:ajVTdAv/9Im8oMAAj5G31PhhMCZJV2p
 github.com/hashicorp/serf v0.8.2/go.mod h1:6hOLApaqBFA1NXqRQAsxw9QxuDEvNxSQRwA/JwenrHc=
 github.com/hashicorp/terraform-exec v0.14.0 h1:UQoUcxKTZZXhyyK68Cwn4mApT4mnFPmEXPiqaHL9r+w=
 github.com/hashicorp/terraform-exec v0.14.0/go.mod h1:qrAASDq28KZiMPDnQ02sFS9udcqEkRly002EA2izXTA=
-github.com/hashicorp/terraform-json v0.11.0/go.mod h1:pmbq9o4EuL43db5+0ogX10Yofv1nozM+wskr/bGFJpI=
 github.com/hashicorp/terraform-json v0.12.0 h1:8czPgEEWWPROStjkWPUnTQDXmpmZPlkQAwYYLETaTvw=
 github.com/hashicorp/terraform-json v0.12.0/go.mod h1:pmbq9o4EuL43db5+0ogX10Yofv1nozM+wskr/bGFJpI=
 github.com/hashicorp/terraform-registry-address v0.0.0-20210412075316-9b2996cce896 h1:1FGtlkJw87UsTMg5s8jrekrHmUPUJaMcu6ELiVhQrNw=
 github.com/hashicorp/terraform-registry-address v0.0.0-20210412075316-9b2996cce896/go.mod h1:bzBPnUIkI0RxauU8Dqo+2KrZZ28Cf48s8V6IHt3p4co=
-github.com/hashicorp/terraform-schema v0.0.0-20210617130010-ab6887832578 h1:r2zk8WVjkHqFCylDTukWwICfuZDh/5+p0S7A/MbHkeY=
-github.com/hashicorp/terraform-schema v0.0.0-20210617130010-ab6887832578/go.mod h1:I401Q0vqx1AvDdh+ND7sC12x+C2sqmY5vTkc7FBjSvM=
+github.com/hashicorp/terraform-schema v0.0.0-20210722111916-2c53a3129d11 h1:AmgdvpxCaq1rb90drpXqOafdPSR4084bOBtDthYrd7Y=
+github.com/hashicorp/terraform-schema v0.0.0-20210722111916-2c53a3129d11/go.mod h1:2rBfUJC+1kyVzt5R/6pRa+d9HbpZrf8sMjQZdh8rSCM=
 github.com/hashicorp/terraform-svchost v0.0.0-20200729002733-f050f53b9734 h1:HKLsbzeOsfXmKNpr3GiT18XAblV0BjCbzL8KQAMZGa0=
 github.com/hashicorp/terraform-svchost v0.0.0-20200729002733-f050f53b9734/go.mod h1:kNDNcF7sN4DocDLBkQYz73HGKwN1ANB1blq4lIYLYvg=
 github.com/huandu/xstrings v1.3.2 h1:L18LIDzqlW6xN2rEkpdV8+oL/IXWJ1APd+vsdYy4Wdw=

internal/state/module.go

@@ -1,6 +1,8 @@
 package state
 
 import (
+	"path/filepath"
+
 	"github.com/hashicorp/go-memdb"
 	"github.com/hashicorp/go-version"
 	"github.com/hashicorp/hcl-lang/lang"
@@ -247,6 +249,36 @@ func (s *ModuleStore) ModuleByPath(path string) (*Module, error) {
 	return mod, nil
 }
 
+func (s *ModuleStore) ModuleCalls(modPath string) ([]tfmod.ModuleCall, error) {
+	result := make([]tfmod.ModuleCall, 0)
+	modList, err := s.List()
+	for _, mod := range modList {
+		if mod.ModManifest != nil {
+			for _, record := range mod.ModManifest.Records {
+				result = append(result, tfmod.ModuleCall{
+					SourceAddr: record.SourceAddr,
+					Path:       filepath.Join(modPath, record.Dir),
+				})
+			}
+		}
+	}
+	return result, err
+}
+
+func (s *ModuleStore) ModuleMeta(modPath string) (*tfmod.Meta, error) {
+	mod, err := s.ModuleByPath(modPath)
+	if err != nil {
+		return nil, err
+	}
+	return &tfmod.Meta{
+		Path:                 mod.Path,
+		ProviderReferences:   mod.Meta.ProviderReferences,
+		ProviderRequirements: mod.Meta.ProviderRequirements,
+		CoreRequirements:     mod.Meta.CoreRequirements,
+		Variables:            mod.Meta.Variables,
+	}, nil
+}
+
 func moduleByPath(txn *memdb.Txn, path string) (*Module, error) {
 	obj, err := txn.First(moduleTableName, "id", path)
 	if err != nil {

internal/state/state.go

@@ -7,6 +7,7 @@ import (
 	"github.com/hashicorp/go-memdb"
 	"github.com/hashicorp/go-version"
 	tfaddr "github.com/hashicorp/terraform-registry-address"
+	tfmod "github.com/hashicorp/terraform-schema/module"
 	tfschema "github.com/hashicorp/terraform-schema/schema"
 )
 
@@ -64,6 +65,11 @@ type ModuleReader interface {
 	List() ([]*Module, error)
 }
 
+type ModuleCallReader interface {
+	ModuleCalls(modPath string) ([]tfmod.ModuleCall, error)
+	ModuleMeta(modPath string) (*tfmod.Meta, error)
+}
+
 type ProviderSchemaStore struct {
 	db        *memdb.MemDB
 	tableName string

internal/terraform/module/module_manager.go

@@ -109,7 +109,7 @@ func (mm *moduleManager) SchemaForModule(modPath string) (*schema.BodySchema, er
 		return nil, err
 	}
 
-	return schemaForModule(mod, mm.schemaStore)
+	return schemaForModule(mod, mm.schemaStore, mm.moduleStore)
 }
 
 func (mm *moduleManager) SchemaForVariables(modPath string) (*schema.BodySchema, error) {
@@ -122,7 +122,7 @@ func (mm *moduleManager) SchemaForVariables(modPath string) (*schema.BodySchema,
 	return tfschema.SchemaForVariables(mod.Meta.Variables)
 }
 
-func schemaForModule(mod *state.Module, schemaReader state.SchemaReader) (*schema.BodySchema, error) {
+func schemaForModule(mod *state.Module, schemaReader state.SchemaReader, modReader state.ModuleCallReader) (*schema.BodySchema, error) {
 	var coreSchema *schema.BodySchema
 	coreRequirements := make(version.Constraints, 0)
 	if mod.TerraformVersion != nil {
@@ -142,6 +142,7 @@ func schemaForModule(mod *state.Module, schemaReader state.SchemaReader) (*schem
 	sm := tfschema.NewSchemaMerger(coreSchema)
 	sm.SetSchemaReader(schemaReader)
 	sm.SetTerraformVersion(mod.TerraformVersion)
+	sm.SetModuleReader(modReader)
 
 	meta := &tfmodule.Meta{
 		Path:                 mod.Path,

internal/terraform/module/module_ops.go

@@ -293,8 +293,21 @@ func ParseModuleManifest(fs filesystem.Filesystem, modStore *state.ModuleStore,
 		}
 		return err
 	}
+	if mm != nil {
+		for _, modRecord := range mm.Records {
+			modModulePath := filepath.Join(modPath, modRecord.Dir)
+			_, err := modStore.ModuleByPath(modModulePath)
+			if err != nil {
+				modStore.Add(modModulePath)
+				ParseModuleConfiguration(fs, modStore, modModulePath)
+				ParseVariables(fs, modStore, modModulePath)
+				LoadModuleMetadata(modStore, modModulePath)
+			}
+		}
+	}
 
 	sErr := modStore.UpdateModManifest(modPath, mm, err)
+
 	if sErr != nil {
 		return sErr
 	}
@@ -358,7 +371,7 @@ func DecodeReferenceTargets(modStore *state.ModuleStore, schemaReader state.Sche
 		}
 	}
 
-	fullSchema, schemaErr := schemaForModule(mod, schemaReader)
+	fullSchema, schemaErr := schemaForModule(mod, schemaReader, modStore)
 	if schemaErr != nil {
 		sErr := modStore.UpdateReferenceTargets(modPath, lang.ReferenceTargets{}, schemaErr)
 		if sErr != nil {
@@ -400,7 +413,7 @@ func DecodeReferenceOrigins(modStore *state.ModuleStore, schemaReader state.Sche
 		}
 	}
 
-	fullSchema, schemaErr := schemaForModule(mod, schemaReader)
+	fullSchema, schemaErr := schemaForModule(mod, schemaReader, modStore)
 	if schemaErr != nil {
 		sErr := modStore.UpdateReferenceOrigins(modPath, lang.ReferenceOrigins{}, schemaErr)
 		if sErr != nil {