json output mode for test results

src/scribe/result.go

@@ -8,6 +8,7 @@
 package scribe
 
 import (
+	"encoding/json"
 	"fmt"
 	"strings"
 )
@@ -89,6 +90,15 @@ func (r *TestResult) SingleLineResults() []string {
 	return lns
 }
 
+// A helper function to convert TestResult into a JSON string.
+func (r *TestResult) JSON() string {
+	buf, err := json.Marshal(r)
+	if err != nil {
+		fmt.Sprintf("JSON encoding error: %v", err)
+	}
+	return string(buf)
+}
+
 // A helper function to convert TestResult into a human readable result
 // suitable for display.
 func (r *TestResult) String() string {

src/scribecmd/main.go

@@ -27,6 +27,7 @@ func main() {
 		testHooks    bool
 		showVersion  bool
 		lineFmt      bool
+		jsonFmt      bool
 	)
 
 	err := scribe.Bootstrap()
@@ -39,6 +40,7 @@ func main() {
 	flag.BoolVar(&expectedExit, "e", false, "exit if result is unexpected")
 	flag.StringVar(&docpath, "f", "", "path to document")
 	flag.BoolVar(&lineFmt, "l", false, "output one result per line")
+	flag.BoolVar(&jsonFmt, "j", false, "JSON output mode")
 	flag.BoolVar(&testHooks, "t", false, "enable test hooks")
 	flag.BoolVar(&showVersion, "v", false, "show version")
 	flag.Parse()
@@ -95,6 +97,8 @@ func main() {
 			for _, x := range tr.SingleLineResults() {
 				fmt.Fprintf(os.Stdout, "%v\n", x)
 			}
+		} else if jsonFmt {
+			fmt.Fprintf(os.Stdout, "%v\n", tr.JSON())
 		} else {
 			fmt.Fprintf(os.Stdout, "%v\n", tr.String())
 		}