Pretty JSON export (#9165)

plugins/exporter.koplugin/target/json.lua

@@ -1,5 +1,6 @@
-local json = require("json")
 local Device = require("device")
+local rapidjson = require("rapidjson")
+
 -- json exporter
 local JsonExporter = require("base"):new {
     name = "json",
@@ -41,7 +42,7 @@ function JsonExporter:export(t)
     end
     local file = io.open(path, "w")
     if not file then return false end
-    file:write(json.encode(exportable))
+    file:write(rapidjson.encode(exportable, {pretty = true}))
     file:write("\n")
     file:close()
     return true
@@ -51,7 +52,7 @@ function JsonExporter:share(t)
     local content = format(t)
     content.created_on = self.timestamp or os.time()
     content.version = self:getVersion()
-    Device:doShareText(content)
+    Device:doShareText(rapidjson.encode(content, {pretty = true}))
 end
 
 return JsonExporter