Documentation: automatically check that documentation is up to date

Since we always forget to update the documentation lets check this
automatically.

Documentation/usage/dlv.md

@@ -51,4 +51,3 @@ Pass flags to the program you are debugging using `--`, for example:
 * [dlv trace](dlv_trace.md)	 - Compile and begin tracing program.
 * [dlv version](dlv_version.md)	 - Prints version.
 
-###### Auto generated by spf13/cobra on 17-Apr-2018

Documentation/usage/dlv_attach.md

@@ -42,4 +42,3 @@ dlv attach pid [executable]
 ### SEE ALSO
 * [dlv](dlv.md)	 - Delve is a debugger for the Go programming language.
 
-###### Auto generated by spf13/cobra on 17-Apr-2018

Documentation/usage/dlv_connect.md

@@ -37,4 +37,3 @@ dlv connect addr
 ### SEE ALSO
 * [dlv](dlv.md)	 - Delve is a debugger for the Go programming language.
 
-###### Auto generated by spf13/cobra on 17-Apr-2018

Documentation/usage/dlv_core.md

@@ -41,4 +41,3 @@ dlv core <executable> <core>
 ### SEE ALSO
 * [dlv](dlv.md)	 - Delve is a debugger for the Go programming language.
 
-###### Auto generated by spf13/cobra on 17-Apr-2018

Documentation/usage/dlv_debug.md

@@ -48,4 +48,3 @@ dlv debug [package]
 ### SEE ALSO
 * [dlv](dlv.md)	 - Delve is a debugger for the Go programming language.
 
-###### Auto generated by spf13/cobra on 17-Apr-2018

Documentation/usage/dlv_exec.md

@@ -42,4 +42,3 @@ dlv exec <path/to/binary>
 ### SEE ALSO
 * [dlv](dlv.md)	 - Delve is a debugger for the Go programming language.
 
-###### Auto generated by spf13/cobra on 17-Apr-2018

Documentation/usage/dlv_replay.md

@@ -41,4 +41,3 @@ dlv replay [trace directory]
 ### SEE ALSO
 * [dlv](dlv.md)	 - Delve is a debugger for the Go programming language.
 
-###### Auto generated by spf13/cobra on 17-Apr-2018

Documentation/usage/dlv_run.md

@@ -37,4 +37,3 @@ dlv run
 ### SEE ALSO
 * [dlv](dlv.md)	 - Delve is a debugger for the Go programming language.
 
-###### Auto generated by spf13/cobra on 17-Apr-2018

Documentation/usage/dlv_test.md

@@ -48,4 +48,3 @@ dlv test [package]
 ### SEE ALSO
 * [dlv](dlv.md)	 - Delve is a debugger for the Go programming language.
 
-###### Auto generated by spf13/cobra on 17-Apr-2018

Documentation/usage/dlv_trace.md

@@ -50,4 +50,3 @@ dlv trace [package] regexp
 ### SEE ALSO
 * [dlv](dlv.md)	 - Delve is a debugger for the Go programming language.
 
-###### Auto generated by spf13/cobra on 17-Apr-2018

Documentation/usage/dlv_version.md

@@ -37,4 +37,3 @@ dlv version
 ### SEE ALSO
 * [dlv](dlv.md)	 - Delve is a debugger for the Go programming language.
 
-###### Auto generated by spf13/cobra on 17-Apr-2018

cmd/dlv/cmds/commands.go

@@ -270,6 +270,8 @@ https://github.com/mozilla/rr
 		RootCommand.AddCommand(replayCommand)
 	}
 
+	RootCommand.DisableAutoGenTag = true
+
 	return RootCommand
 }
 

cmd/dlv/dlv_test.go

@@ -1,4 +1,4 @@
-package main
+package main_test
 
 import (
 	"bufio"
@@ -14,8 +14,11 @@ import (
 	"testing"
 	"time"
 
+	"github.com/derekparker/delve/cmd/dlv/cmds"
 	protest "github.com/derekparker/delve/pkg/proc/test"
+	"github.com/derekparker/delve/pkg/terminal"
 	"github.com/derekparker/delve/service/rpc2"
+	"github.com/spf13/cobra/doc"
 )
 
 var testBackend string
@@ -202,3 +205,48 @@ func TestOutput(t *testing.T) {
 		}
 	}
 }
+
+func checkAutogenDoc(t *testing.T, filename, gencommand string, generated []byte) {
+	saved := slurpFile(t, os.ExpandEnv(fmt.Sprintf("$GOPATH/src/github.com/derekparker/delve/%s", filename)))
+
+	if len(saved) != len(generated) {
+		t.Fatalf("%s: needs to be regenerated run scripts/gen-cli-docs.go", filename)
+	}
+
+	for i := range saved {
+		if saved[i] != generated[i] {
+			t.Fatalf("%s: needs to be regenerated; run %s", filename, gencommand)
+		}
+	}
+}
+
+func slurpFile(t *testing.T, filename string) []byte {
+	saved, err := ioutil.ReadFile(filename)
+	if err != nil {
+		t.Fatalf("Could not read %s: %v", filename, err)
+	}
+	return saved
+}
+
+// TestGeneratedDoc tests that the autogenerated documentation has been
+// updated.
+func TestGeneratedDoc(t *testing.T) {
+	// Checks gen-cli-docs.go
+	var generatedBuf bytes.Buffer
+	commands := terminal.DebugCommands(nil)
+	commands.WriteMarkdown(&generatedBuf)
+	cliDocFilename := "Documentation/cli/README.md"
+	checkAutogenDoc(t, cliDocFilename, "scripts/gen-cli-docs.go", generatedBuf.Bytes())
+
+	// Checks gen-usage-docs.go
+	tempDir, err := ioutil.TempDir(os.TempDir(), "test-gen-doc")
+	assertNoError(err, t, "TempDir")
+	defer cmds.SafeRemoveAll(tempDir)
+	doc.GenMarkdownTree(cmds.New(true), tempDir)
+	entries, err := ioutil.ReadDir(tempDir)
+	assertNoError(err, t, "ReadDir")
+	for _, doc := range entries {
+		docFilename := "Documentation/usage/" + doc.Name()
+		checkAutogenDoc(t, docFilename, "scripts/gen-usage-docs.go", slurpFile(t, tempDir+"/"+doc.Name()))
+	}
+}