Implement ^,$ navigating to 0%,100% in x-direction

This is made possible by also allowing the second
argument to be "x" or "y". We supply "y" as the
default to retain the current, more commonly
desired behavior.

src/config.ts

@@ -44,6 +44,9 @@ const DEFAULTS = o({
         "l": "scrollpx 50",
         "G": "scrollto 100",
         "gg": "scrollto 0",
+        "$": "scrollto 100 x",
+        // "0": "scrollto 0 x", // will get interpreted as a count
+        "^": "scrollto 0 x",
         "H": "back",
         "L": "forward",
         "d": "tabclose",

src/excmds.ts

@@ -186,21 +186,25 @@ export function scrollpx(a: number, b: number) {
     window.scrollBy(a, b)
 }
 
-/** If one argument is given, scroll to that percentage down the page.
-    If two arguments are given, treat as x and y values to give to window.scrollTo
+/** If two numbers are given, treat as x and y values to give to window.scrollTo
+    If one number is given, scroll to that percentage along a chosen axis,
+        defaulting to the y-axis
 */
 //#content
-export function scrollto(a: number, b?: number) {
+export function scrollto(a: number, b: number | "x" | "y" = "y") {
     a = Number(a)
-    // if b is undefined, Number(b) is NaN.
-    b = Number(b)
-    window.scrollTo(
-        b ? a : window.scrollX,
-        b
-            ? b
-            : a.clamp(0, 100) *
-              (window.document.scrollingElement.scrollHeight / 100)
-    )
+    if (b === "y") {
+        window.scrollTo(
+            window.scrollX,
+            a.clamp(0, 100) * window.document.scrollingElement.scrollHeight / 100)
+    }
+    else if (b === "x") {
+        window.scrollTo(
+            a.clamp(0, 100) * window.document.scrollingElement.scrollWidth / 100,
+            window.scrollY)
+    } else {
+        window.scrollTo(a, Number(b)) // a,b numbers
+    }
 }
 
 //#content
@@ -272,7 +276,7 @@ export function open(...urlarr: string[]) {
 
 
 /** Go to your homepage(s)
- 
+
     @param all
         - if "true", opens all homepages in new tabs
         - if "false" or not given, opens the last homepage in the current tab
@@ -1214,7 +1218,7 @@ export async function sanitize(...args: string[]) {
 
     Afterwards use go[key], gn[key], or gw[key] to [[open]], [[tabopen]], or
     [[winopen]] the URL respectively.
-    
+
 */
 //#background
 export async function quickmark(key: string, ...addressarr: string[]) {
@@ -1249,7 +1253,7 @@ export function get(target: string, property?: string){
     (i.e. not nmaps.)
 
     It can be used on any string <-> string settings found [here](/static/docs/modules/_config_.html#defaults)
- 
+
 */
 //#background
 export function set(setting: string, ...value: string[]){
@@ -1431,13 +1435,13 @@ export async function ttscontrol(action: string) {
 /** Add or remove a bookmark.
 *
 * Optionally, you may give the bookmark a title. If no URL is given, a bookmark is added for the current page.
-* 
+*
 * If a bookmark already exists for the URL, it is removed.
 */
 //#background
 export async function bmark(url?: string, ...titlearr: string[] ){
     url = url === undefined ? (await activeTab()).url : url
-    let title = titlearr.join(" ") 
+    let title = titlearr.join(" ")
     let dupbmarks = await browser.bookmarks.search({url})
     dupbmarks.map((bookmark) => browser.bookmarks.remove(bookmark.id))
     if (dupbmarks.length == 0 ) {browser.bookmarks.create({url, title})}