add print flag. Need to figure out how to make datasetPath optional when its used...

Author: rwblair

src/setup/loadSchema.ts

@@ -27,7 +27,7 @@ function merge(obj1, obj2) {
  *
  * version is ignored when the network cannot be accessed
  */
-export async function loadSchema(version?: string, patch?: string): Promise<Schema> {
+export async function loadSchema(version?: string, patch?: string, print?: boolean): Promise<Schema> {
   let schemaUrl = version
   const bidsSchema = typeof Deno !== 'undefined' ? Deno.env.get('BIDS_SCHEMA') : undefined
   if (bidsSchema !== undefined) {
@@ -64,6 +64,10 @@ export async function loadSchema(version?: string, patch?: string): Promise<Sche
     schema = merge(schema, patchJson)
   }
 
+  if (print) {
+    console.log(JSON.stringify(schema))
+    Deno.exit(0)
+  }
   setCustomMetadataFormats(schema)
   return schema
 }

src/setup/options.ts

@@ -33,6 +33,7 @@ export type ValidatorOptions = {
   prune?: boolean
   maxRows?: number
   schemaAddon?: string
+  printSchema?: boolean
 }
 
 const datasetType = new EnumType<string>(
@@ -103,6 +104,10 @@ export const validateCommand: Command<void, void, any, string[], void> = new Com
     '--schema-addon <file:string>',
     'Json file to be merged with loaded schema.',
   )
+  .option(
+    '--printSchema',
+    'Print schema that was loaded and exit.',
+  )
 
 // Disabling color output is only available in Deno
 if (typeof Deno !== 'undefined') {