command/graph: takes config dir as arg

command/command_test.go

@@ -13,7 +13,7 @@ import (
 const fixtureDir = "./test-fixtures"
 
 func testFixturePath(name string) string {
-	return filepath.Join(fixtureDir, name, "main.tf")
+	return filepath.Join(fixtureDir, name)
 }
 
 func testCtxConfig(p terraform.ResourceProvider) *terraform.ContextOpts {

command/graph.go

@@ -1,9 +1,9 @@
 package command
 
 import (
+	"bytes"
 	"flag"
 	"fmt"
-	"os"
 	"strings"
 
 	"github.com/hashicorp/terraform/config"
@@ -33,7 +33,9 @@ func (c *GraphCommand) Run(args []string) int {
 		return 1
 	}
 
-	conf, err := config.Load(args[0])
+	path := args[0]
+
+	conf, err := config.LoadDir(path)
 	if err != nil {
 		c.Ui.Error(fmt.Sprintf("Error loading config: %s", err))
 		return 1
@@ -48,11 +50,14 @@ func (c *GraphCommand) Run(args []string) int {
 		return 1
 	}
 
+	buf := new(bytes.Buffer)
 	nodes := make([]digraph.Node, len(g.Nouns))
 	for i, n := range g.Nouns {
 		nodes[i] = n
 	}
-	digraph.GenerateDot(nodes, os.Stdout)
+	digraph.GenerateDot(nodes, buf)
+
+	c.Ui.Output(buf.String())
 
 	return 0
 }
@@ -66,6 +71,10 @@ Usage: terraform graph [options] PATH
   shown. If the path is a plan file, then the dependency graph of the
   plan itself is shown.
 
+  The graph is outputted in DOT format. The typical program that can
+  read this format is GraphViz, but many web services are also available
+  to read this format.
+
 `
 	return strings.TrimSpace(helpText)
 }

command/graph_test.go

@@ -0,0 +1,57 @@
+package command
+
+import (
+	"strings"
+	"testing"
+
+	"github.com/mitchellh/cli"
+)
+
+func TestGraph(t *testing.T) {
+	ui := new(cli.MockUi)
+	c := &GraphCommand{
+		ContextOpts: testCtxConfig(testProvider()),
+		Ui:          ui,
+	}
+
+	args := []string{
+		testFixturePath("graph"),
+	}
+	if code := c.Run(args); code != 0 {
+		t.Fatalf("bad: \n%s", ui.ErrorWriter.String())
+	}
+
+	output := ui.OutputWriter.String()
+	if !strings.Contains(output, "digraph {") {
+		t.Fatalf("doesn't look like digraph: %s", output)
+	}
+}
+
+func TestGraph_noArgs(t *testing.T) {
+	ui := new(cli.MockUi)
+	c := &ApplyCommand{
+		ContextOpts: testCtxConfig(testProvider()),
+		Ui:          ui,
+	}
+
+	args := []string{}
+	if code := c.Run(args); code != 1 {
+		t.Fatalf("bad: \n%s", ui.OutputWriter.String())
+	}
+}
+
+func TestGraph_multipleArgs(t *testing.T) {
+	ui := new(cli.MockUi)
+	c := &ApplyCommand{
+		ContextOpts: testCtxConfig(testProvider()),
+		Ui:          ui,
+	}
+
+	args := []string{
+		"bad",
+		"bad",
+	}
+	if code := c.Run(args); code != 1 {
+		t.Fatalf("bad: \n%s", ui.OutputWriter.String())
+	}
+}

command/test-fixtures/graph/main.tf

@@ -0,0 +1,3 @@
+resource "test_instance" "foo" {
+    ami = "bar"
+}