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

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()