add exmcmds to load RC file from url

src/background/config_rc.ts

@@ -13,6 +13,25 @@ export async function source(filename = "auto") {
     return true
 }
 
+async function fetchConfig(url: string) {
+    const response = await fetch(url)
+    const reader = response.body.getReader()
+    let rctext = ""
+    const decoder = new TextDecoder("utf-8")
+    while (true) {
+        const { value: chunk, done: isDone } = await reader.read()
+        if (isDone) return rctext
+        rctext += decoder.decode(chunk)
+    }
+}
+
+export async function sourceFromUrl(url: string) {
+    const rctext = await fetchConfig(url)
+    if (!rctext) return false
+    await runRc(rctext)
+    return true
+}
+
 export async function writeRc(conf: string, force = false, filename = "auto") {
     let path: string
     if (filename === "auto") {

src/excmds.ts

@@ -751,6 +751,26 @@ export async function source_quiet(...fileArr: string[]) {
     }
 }
 
+/** Use tridactylrc located at the given url
+ * @param url the url where the raw version of tridactylrc can be found
+ */
+//#background
+export async function source_from_url(url: string) {
+    if (!url) return
+    await rc.sourceFromUrl(url)
+}
+
+/**
+ * Same as [[source_from_url]] but suppresses all errors
+ */
+//#background
+export async function source_from_url_quiet(url: string) {
+    if (!url) return
+    try {
+        await rc.sourceFromUrl(url)
+    } catch (e) {}
+}
+
 /**
  * Updates the native messenger if it is installed, using our GitHub repo. This is run every time Tridactyl is updated.
  *