terminal: Implements init file and source command

The 'source' command reads the file specified as argument and executes
it as a list of delve commands.
Additionally a flag '--init' can be passed to delve specifying a file
containing a list of commands to execute on startup.

Issue #96

_fixtures/bpfile

+# comment line
+trace main.main
+
+break main.sayhi
+
+#
+# comment line
+#

cmd/dlv/main.go

@@ -27,6 +27,7 @@ var (
 	Log      bool
 	Headless bool
 	Addr     string
+	InitFile string
 )
 
 func main() {
@@ -48,6 +49,7 @@ The goal of this tool is to provide a simple yet powerful interface for debuggin
 	rootCommand.PersistentFlags().StringVarP(&Addr, "listen", "l", "localhost:0", "Debugging server listen address.")
 	rootCommand.PersistentFlags().BoolVarP(&Log, "log", "", false, "Enable debugging server logging.")
 	rootCommand.PersistentFlags().BoolVarP(&Headless, "headless", "", false, "Run debug server only, in headless mode.")
+	rootCommand.PersistentFlags().StringVar(&InitFile, "init", "", "Init file, executed by the terminal client")
 
 	// 'version' subcommand.
 	versionCommand := &cobra.Command{
@@ -292,6 +294,10 @@ func execute(attachPid int, processArgs []string, conf *config.Config) int {
 	}
 	defer listener.Close()
 
+	if Headless && (InitFile != "") {
+		fmt.Fprintf(os.Stderr, "Warning: init file ignored\n")
+	}
+
 	// Create and start a debugger server
 	server := rpc.NewServer(&service.Config{
 		Listener:    listener,
@@ -309,6 +315,7 @@ func execute(attachPid int, processArgs []string, conf *config.Config) int {
 		var client service.Client
 		client = rpc.NewClient(listener.Addr().String())
 		term := terminal.New(client, conf)
+		term.InitFile = InitFile
 		err, status = term.Run()
 	} else {
 		ch := make(chan os.Signal)

proc/test/support.go

@@ -23,10 +23,7 @@ type Fixture struct {
 // Fixtures is a map of Fixture.Name to Fixture.
 var Fixtures map[string]Fixture = make(map[string]Fixture)
 
-func BuildFixture(name string) Fixture {
-	if f, ok := Fixtures[name]; ok {
-		return f
-	}
+func FindFixturesDir() string {
 	parent := ".."
 	fixturesDir := "_fixtures"
 	for depth := 0; depth < 10; depth++ {
@@ -35,6 +32,15 @@ func BuildFixture(name string) Fixture {
 		}
 		fixturesDir = filepath.Join(parent, fixturesDir)
 	}
+	return fixturesDir
+}
+
+func BuildFixture(name string) Fixture {
+	if f, ok := Fixtures[name]; ok {
+		return f
+	}
+
+	fixturesDir := FindFixturesDir()
 
 	// Make a (good enough) random temporary file name
 	r := make([]byte, 4)

terminal/command.go

@@ -41,9 +41,9 @@ func (c command) match(cmdstr string) bool {
 }
 
 type Commands struct {
-	cmds    []command
-	lastCmd cmdfunc
-	client  service.Client
+	cmds            []command
+	lastCmd         cmdfunc
+	client          service.Client
 }
 
 // Returns a Commands struct with default commands defined.
@@ -77,6 +77,7 @@ func DebugCommands(client service.Client) *Commands {
 		{aliases: []string{"list", "ls"}, cmdFn: listCommand, helpMsg: "list <linespec>.  Show source around current point or provided linespec."},
 		{aliases: []string{"stack", "bt"}, cmdFn: stackCommand, helpMsg: "stack [<depth>] [-full]. Prints stack."},
 		{aliases: []string{"frame"}, cmdFn: frame, helpMsg: "Sets current stack frame (0 is the top of the stack)"},
+		{aliases: []string{"source"}, cmdFn: c.sourceCommand, helpMsg: "Executes a file containing a list of delve commands"},
 	}
 
 	return c
@@ -699,6 +700,14 @@ func listCommand(t *Term, args ...string) error {
 	return nil
 }
 
+func (cmds *Commands) sourceCommand(t *Term, args ...string) error {
+	if len(args) != 1 {
+		return fmt.Errorf("wrong number of arguments: source <filename>")
+	}
+
+	return cmds.executeFile(t, args[0])
+}
+
 func digits(n int) int {
 	return int(math.Floor(math.Log10(float64(n)))) + 1
 }
@@ -826,3 +835,32 @@ func shortenFilePath(fullPath string) string {
 	workingDir, _ := os.Getwd()
 	return strings.Replace(fullPath, workingDir, ".", 1)
 }
+
+func (cmds *Commands) executeFile(t *Term, name string) error {
+	fh, err := os.Open(name)
+	if err != nil {
+		return err
+	}
+	defer fh.Close()
+
+	scanner := bufio.NewScanner(fh)
+	lineno := 0
+	for scanner.Scan() {
+		line := strings.TrimSpace(scanner.Text())
+		lineno++
+
+		if line == "" || line[0] == '#' {
+			continue
+		}
+
+		cmdstr, args := parseCommand(line)
+		cmd := cmds.Find(cmdstr)
+		err := cmd(t, args...)
+
+		if err != nil {
+			fmt.Printf("%s:%d: %v\n", name, lineno, err)
+		}
+	}
+
+	return scanner.Err()
+}

terminal/command_test.go

@@ -2,7 +2,10 @@ package terminal
 
 import (
 	"fmt"
+	"path/filepath"
 	"testing"
+
+	"github.com/derekparker/delve/proc/test"
 )
 
 func TestCommandDefault(t *testing.T) {
@@ -65,3 +68,33 @@ func TestCommandThread(t *testing.T) {
 		t.Fatal("wrong command output: ", err.Error())
 	}
 }
+
+func TestExecuteFile(t *testing.T) {
+	breakCount := 0
+	traceCount := 0
+	c := &Commands{
+		client: nil,
+		cmds: []command{
+			{aliases: []string{"trace"}, cmdFn: func(t *Term, args ...string) error {
+				traceCount++
+				return nil
+			}},
+			{aliases: []string{"break"}, cmdFn: func(t *Term, args ...string) error {
+				breakCount++
+				return nil
+			}},
+		},
+	}
+
+	fixturesDir := test.FindFixturesDir()
+
+	err := c.executeFile(nil, filepath.Join(fixturesDir, "bpfile"))
+
+	if err != nil {
+		t.Fatalf("executeFile: %v", err)
+	}
+
+	if breakCount != 1 || traceCount != 1 {
+		t.Fatalf("Wrong counts break: %d trace: %d\n", breakCount, traceCount)
+	}
+}

terminal/terminal.go

@@ -26,6 +26,7 @@ type Term struct {
 	line   *liner.State
 	conf   *config.Config
 	dumb   bool
+	InitFile string
 }
 
 func New(client service.Client, conf *config.Config) *Term {
@@ -85,6 +86,13 @@ func (t *Term) Run() (error, int) {
 	f.Close()
 	fmt.Println("Type 'help' for list of commands.")
 
+	if t.InitFile != "" {
+		err := cmds.executeFile(t, t.InitFile)
+		if err != nil {
+			fmt.Fprintf(os.Stderr, "Error executing init file: %s\n", err)
+		}
+	}
+
 	var status int
 	for {
 		cmdstr, err := t.promptForInput()