talk: Let the token be in a file

mods/talk.go

@@ -4,6 +4,7 @@ import (
 	"bytes"
 	"encoding/json"
 	"fmt"
+	"io/ioutil"
 	"log"
 	"net/http"
 	"strconv"
@@ -54,6 +55,13 @@ type QResponse struct {
 const talkBaseURL = "https://api.api.ai/v1"
 
 func inittalk() {
+	if strings.HasPrefix(*talktoken, "@") {
+		data, err := ioutil.ReadFile((*talktoken)[1:])
+		if err != nil {
+			panic(err)
+		}
+		*talktoken = string(data)
+	}
 	if *talktoken == "" {
 		panic(fmt.Errorf("API token for api.ai must be provided! (provide it or --disable talk)"))
 	}