Add yank anchor hint submode (;#)

THis yanks the page URL with the hinted elements id or title as a hash
fragment, which can be used to link to the page at that element's
location.

For example: https://en.wikipedia.org/wiki/Vim_(text_editor)#History

;# nmap added, from Vimperator

src/excmds.ts

@@ -1027,6 +1027,7 @@ import * as hinting from './hinting_background'
         - -i view an image
         - -I view an image in a new tab
         - -; focus an element
+        - -# yank an element's anchor URL to clipboard
 */
 //#background
 export function hint(option?: string) {
@@ -1036,6 +1037,7 @@ export function hint(option?: string) {
     else if (option === "-i") hinting.hintImage(false)
     else if (option === "-I") hinting.hintImage(true)
     else if (option === "-;") hinting.hintFocus()
+    else if (option === "-#") hinting.hintPageAnchorYank()
     else hinting.hintPageSimple()
 }
 

src/hinting.ts

@@ -211,6 +211,14 @@ function hintableImages() {
         isVisible)
 }
 
+/** Get arrat of "anchors": elements which have id or name and can be addressed
+ * with the hash/fragment in the URL
+ */
+function anchors() {
+    return Array.from(document.querySelectorAll(HINTTAGS_anchor_selectors))
+        .filter(isVisible)
+}
+
 // CSS selectors. More readable for web developers. Not dead. Leaves browser to care about XML.
 const HINTTAGS_selectors = `
 input:not([type=hidden]):not([disabled]),
@@ -265,6 +273,11 @@ img,
 [src]
 `
 
+const HINTTAGS_anchor_selectors = `
+[id],
+[name]
+`
+
 import {activeTab, browserBg, l, firefoxVersionAtLeast} from './lib/webext'
 
 async function openInBackground(url: string) {
@@ -327,6 +340,20 @@ function hintPageYank() {
     })
 }
 
+/** Hint anchors and yank the URL on selection
+ */
+function hintPageAnchorYank() {
+
+    hintPage(anchors(), hint=>{
+
+        let anchorUrl = new URL(window.location.href)
+
+        anchorUrl.hash = hint.target.id || hint.target.name;
+
+        messageActiveTab("commandline_frame", "setClipboard", [anchorUrl.href])
+    })
+}
+
 /** Hint images, opening in the same tab, or in a background tab
  *
  * @param inBackground  opens the image source URL in a background tab,
@@ -366,6 +393,7 @@ addListener('hinting_content', attributeCaller({
     hintPageSimple,
     hintPageYank,
     hintPageTextYank,
+    hintPageAnchorYank,
     hintPageOpenInBackground,
     hintImage,
     hintFocus,

src/hinting_background.ts

@@ -19,6 +19,11 @@ export async function hintPageYank() {
 export async function hintPageTextYank() {
     return await messageActiveTab('hinting_content', 'hintPageTextYank')
 }
+
+export async function hintPageAnchorYank() {
+    return await messageActiveTab('hinting_content', 'hintPageAnchorYank')
+}
+
 export async function hintPageSimple() {
     return await messageActiveTab('hinting_content', 'hintPageSimple')
 }

src/parsers/normalmode.ts

@@ -61,6 +61,7 @@ export const DEFAULTNMAPS = {
     ";y": "hint -y",
     ";p": "hint -p",
     ";;": "hint -;",
+    ";#": "hint -#",
     "I": "mode ignore",
     "a": "current_url bmark",
     "A": "bmark",