Add function to build command URI.

Author: kaniandr

src/functions.ts

@@ -209,18 +209,30 @@ export function commandLink({ command, project, title, body, query }:
       body: string;
       query: any;
     }): string {
-  let uri = project.uri.with({
-    scheme: "tsar",
-    query: typeof query === 'string' ? query : JSON.stringify(query)
-  });
   return `
     <a class="source-link"
-       href="${encodeURI(
-         `command:${command}?${encodeURIComponent(JSON.stringify(uri))}`)}"
+       href="${commandRef({ command: command, project: project, query: query })}"
        title="${title}">
       ${body}</a>`;
 }
 
+/**
+ * Return uri which invokes a specified command.
+ * @param query String or JSON representation of command arguments.
+ */
+export function commandRef({ command, project, query }:
+    {
+      command: string;
+      project: Project;
+      query: any;
+    }): string {
+  let uri = project.uri.with({
+    scheme: "tsar",
+    query: typeof query === 'string' ? query : JSON.stringify(query)
+  });
+  return encodeURI(`command:${command}?${encodeURIComponent(JSON.stringify(uri))}`);
+}
+
 /**
  * Return html representation of a link to a project.
  *