main: add main config

config.go

@@ -0,0 +1,45 @@
+package main
+
+import (
+	"github.com/mitchellh/go-libucl"
+)
+
+// Config is the structure of the configuration for the Terraform CLI.
+//
+// This is not the configuration for Terraform itself. That is in the
+// "config" package.
+type Config struct {
+	Providers map[string]string
+}
+
+// Put the parse flags we use for libucl in a constant so we can get
+// equally behaving parsing everywhere.
+const libuclParseFlags = libucl.ParserKeyLowercase
+
+// LoadConfig loads the CLI configuration from ".terraformrc" files.
+func LoadConfig(path string) (*Config, error) {
+	var obj *libucl.Object
+
+	// Parse the file and get the root object.
+	parser := libucl.NewParser(libuclParseFlags)
+	err := parser.AddFile(path)
+	if err == nil {
+		obj = parser.Object()
+		defer obj.Close()
+	}
+	defer parser.Close()
+
+	// If there was an error parsing, return now.
+	if err != nil {
+		return nil, err
+	}
+
+	// Build up the result
+	var result Config
+
+	if err := obj.Decode(&result); err != nil {
+		return nil, err
+	}
+
+	return &result, nil
+}

config_test.go

@@ -0,0 +1,28 @@
+package main
+
+import (
+	"path/filepath"
+	"reflect"
+	"testing"
+)
+
+// This is the directory where our test fixtures are.
+const fixtureDir = "./test-fixtures"
+
+func TestLoadConfig(t *testing.T) {
+	c, err := LoadConfig(filepath.Join(fixtureDir, "config"))
+	if err != nil {
+		t.Fatalf("err: %s", err)
+	}
+
+	expected := &Config{
+		Providers: map[string]string{
+			"aws": "foo",
+			"do":  "bar",
+		},
+	}
+
+	if !reflect.DeepEqual(c, expected) {
+		t.Fatalf("bad: %#v", c)
+	}
+}

test-fixtures/config

@@ -0,0 +1,4 @@
+providers {
+  "aws" = "foo"
+  "do" = "bar"
+}