Only write settings if no error when reading

This commit also switches from yosuke-furukawa/json5 to flynn/json5
because yosuke-furukawa/json5 does not provide a license.

Ref zyedidia/json5#1

Closes #775

cmd/micro/bindings.go

@@ -5,7 +5,7 @@ import (
 	"os"
 	"strings"
 
-	"github.com/zyedidia/json5/encoding/json5"
+	"github.com/flynn/json5"
 	"github.com/zyedidia/tcell"
 )
 

cmd/micro/pluginmanager.go

@@ -14,8 +14,8 @@ import (
 	"sync"
 
 	"github.com/blang/semver"
+	"github.com/flynn/json5"
 	"github.com/yuin/gopher-lua"
-	"github.com/zyedidia/json5/encoding/json5"
 )
 
 var (

cmd/micro/pluginmanager_test.go

@@ -1,10 +1,11 @@
 package main
 
 import (
-	"github.com/blang/semver"
 	"testing"
 
-	"github.com/zyedidia/json5/encoding/json5"
+	"github.com/blang/semver"
+
+	"github.com/flynn/json5"
 )
 
 func TestDependencyResolving(t *testing.T) {

cmd/micro/settings.go

@@ -1,6 +1,7 @@
 package main
 
 import (
+	"encoding/json"
 	"errors"
 	"io/ioutil"
 	"os"
@@ -8,8 +9,8 @@ import (
 	"strconv"
 	"strings"
 
+	"github.com/flynn/json5"
 	"github.com/zyedidia/glob"
-	"github.com/zyedidia/json5/encoding/json5"
 )
 
 type optionValidator func(string, interface{}) error
@@ -17,6 +18,8 @@ type optionValidator func(string, interface{}) error
 // The options that the user can set
 var globalSettings map[string]interface{}
 
+var invalidSettings bool
+
 // Options with validators
 var optionValidators = map[string]optionValidator{
 	"tabsize":      validatePositiveValue,
@@ -28,6 +31,7 @@ var optionValidators = map[string]optionValidator{
 
 // InitGlobalSettings initializes the options map and sets all options to their default values
 func InitGlobalSettings() {
+	invalidSettings = false
 	defaults := DefaultGlobalSettings()
 	var parsed map[string]interface{}
 
@@ -38,12 +42,14 @@ func InitGlobalSettings() {
 		if !strings.HasPrefix(string(input), "null") {
 			if err != nil {
 				TermMessage("Error reading settings.json file: " + err.Error())
+				invalidSettings = true
 				return
 			}
 
 			err = json5.Unmarshal(input, &parsed)
 			if err != nil {
 				TermMessage("Error reading settings.json:", err.Error())
+				invalidSettings = true
 			}
 		} else {
 			writeSettings = true
@@ -71,6 +77,7 @@ func InitGlobalSettings() {
 // InitLocalSettings scans the json in settings.json and sets the options locally based
 // on whether the buffer matches the glob
 func InitLocalSettings(buf *Buffer) {
+	invalidSettings = false
 	var parsed map[string]interface{}
 
 	filename := configDir + "/settings.json"
@@ -78,12 +85,14 @@ func InitLocalSettings(buf *Buffer) {
 		input, err := ioutil.ReadFile(filename)
 		if err != nil {
 			TermMessage("Error reading settings.json file: " + err.Error())
+			invalidSettings = true
 			return
 		}
 
 		err = json5.Unmarshal(input, &parsed)
 		if err != nil {
 			TermMessage("Error reading settings.json:", err.Error())
+			invalidSettings = true
 		}
 	}
 
@@ -106,6 +115,11 @@ func InitLocalSettings(buf *Buffer) {
 
 // WriteSettings writes the settings to the specified filename as JSON
 func WriteSettings(filename string) error {
+	if invalidSettings {
+		// Do not write the settings if there was an error when reading them
+		return nil
+	}
+
 	var err error
 	if _, e := os.Stat(configDir); e == nil {
 		parsed := make(map[string]interface{})
@@ -124,6 +138,7 @@ func WriteSettings(filename string) error {
 				err = json5.Unmarshal(input, &parsed)
 				if err != nil {
 					TermMessage("Error reading settings.json:", err.Error())
+					invalidSettings = true
 				}
 
 				for k, v := range parsed {
@@ -136,7 +151,7 @@ func WriteSettings(filename string) error {
 			}
 		}
 
-		txt, _ := json5.MarshalIndent(parsed, "", "    ")
+		txt, _ := json.MarshalIndent(parsed, "", "    ")
 		err = ioutil.WriteFile(filename, append(txt, '\n'), 0644)
 	}
 	return err