feat: Fixed Trig serialization

src/trig/trigUtil.ts

@@ -6,8 +6,35 @@ export type TrigPackage = rdf.Quad[]
 export type TrigPackageString = TrigString
 
 export async function serializeTrigPackageToTrigString (content: TrigPackage): Promise<TrigString> {
-  return new Writer({ format: 'application/trig' }).quadsToString(content)
+  return await new Promise((resolve, reject) => {
+    const writer = new Writer({ format: 'application/trig', prefixes: { ex: 'http://example.com/' } })
+    writer.addQuads(content)
+    writer.end((error, result) => {
+      if (error || !result) {
+        throw new Error('Could not serialize package string correctly')
+      }
+      resolve(indentTrigString(result as string))
+    })
+  })
 }
 export function parseTrigStringToTrigPackage (content: TrigString): TrigPackage {
   return new Parser({ format: 'application/trig' }).parse(content)
 }
+
+function indentTrigString (trigString: TrigString): TrigString {
+  let result = ''
+  const indent = '\t'
+  let indented = false
+  for (const line of trigString.split('\n')) {
+    if (line.includes('{')) {
+      indented = true
+      result += line + '\n'
+    } else if (line.includes('}')) {
+      indented = false
+      result += line + '\n'
+    } else {
+      result += indented ? indent + line + '\n' : line + '\n'
+    }
+  }
+  return result.trimEnd()
+}