Factor out common hbs partial for the SPARQL preamble (#455)

Author: jgonggrijp

frontend/src/global/hbsPartials.ts

@@ -0,0 +1,5 @@
+import Handlebars from 'handlebars/dist/handlebars.runtime';
+
+import sparqlPreamble from '../sparql/query-templates/preamble-template';
+
+Handlebars.registerPartial('sparqlPreamble', sparqlPreamble);

frontend/src/main.ts

@@ -7,6 +7,7 @@ import './global/scroll-easings';
 import { i18nPromise } from './global/i18n';
 import './global/internalLinks';
 import './global/hbsHelpers';
+import './global/hbsPartials';
 import user from './global/user';
 import { prefetch } from './global/ld-store';
 import './global/item-cache';

frontend/src/sparql/query-templates/items-for-source-template.hbs

@@ -1,6 +1,4 @@
-{{#each namespaces}}
-PREFIX {{label}}: <{{prefix}}>
-{{/each}}
+{{>sparqlPreamble}}
 PREFIX schema: <http://schema.org/>
 PREFIX oa: <http://www.w3.org/ns/oa#>
 CONSTRUCT {

frontend/src/sparql/query-templates/preamble-template.hbs

@@ -0,0 +1,3 @@
+{{#each namespaces}}
+PREFIX {{label}}: <{{prefix}}>
+{{/each}}

frontend/src/test-util.ts

@@ -6,6 +6,7 @@ import { Events } from 'backbone';
 
 import Store from './common-rdf/store';
 import './global/hbsHelpers';
+import './global/hbsPartials';
 import { i18nPromise } from './global/i18n';
 
 /**