excmd: Simplify IPC for geturlsforlinks

This is more about maybe expanding the macro system in the future. Need
to look at how other projects do it.

scripts/excmds_macros.py

@@ -93,7 +93,7 @@ def content(lines, context):
         sig = Signature(block.split('\n')[0])
         return "cmd_params.set('{sig.name}', ".format(**locals()) + dict_to_js(sig.params) + """)
 {sig.raw}
-    messageActiveTab(
+    return messageActiveTab(
         "excmd_content", 
         "{sig.name}",
         """.format(**locals()) + str(list(sig.params.keys())).replace("'","") + """,

src/excmds.ts

@@ -361,6 +361,10 @@ export function urlparent (){
 }
 
 /** Returns the url of links that have a matching rel.
+
+    Don't bind to this: it's an internal function.
+
+    @hidden
  */
 //#content
 export function geturlsforlinks(rel: string){
@@ -837,13 +841,13 @@ export async function clipboard(excmd: "open"|"yank"|"yankshort"|"yankcanon"|"ta
     let urls = []
     switch (excmd) {
         case 'yankshort':
-            urls = await messageActiveTab("excmd_content", "geturlsforlinks", ["shortlink"]);
+            urls = await geturlsforlinks("shortlink")
             if (urls.length > 0) {
                 messageActiveTab("commandline_frame", "setClipboard", [urls[0]])
                 break
             }
         case 'yankcanon':
-            urls = await messageActiveTab("excmd_content", "geturlsforlinks", ["canonical"]);
+            urls = await geturlsforlinks("canonical")
             if (urls.length > 0) {
                 messageActiveTab("commandline_frame", "setClipboard", [urls[0]])
                 break