init

.gitignore

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+/tmp

README.md

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+# xkcd background
+
+Downloads and set your gnome/cinnamon wallpaper to the current xkcd
+
+## Dependencies
+
+- `deno`
+- `imagemagick`
+- `wget`
+
+## Usage
+
+```sh
+./update.ts
+```
+
+For init scripts, it is recommended to wait for network access before updating to avoid fetching errors, the
+`wait-for-network-then-update` does precisely that :
+
+```sh
+./wait-network-then-update
+```

deno.json

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+{
+    "fmt": {
+        "useTabs": true,
+        "lineWidth": 120,
+        "semiColons": false
+    }
+}

deno.lock

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+{
+  "version": "3",
+  "remote": {
+    "https://deno.land/std@0.138.0/_util/assert.ts": "e94f2eb37cebd7f199952e242c77654e43333c1ac4c5c700e929ea3aa5489f74",
+    "https://deno.land/std@0.138.0/_util/os.ts": "49b92edea1e82ba295ec946de8ffd956ed123e2948d9bd1d3e901b04e4307617",
+    "https://deno.land/std@0.138.0/path/_constants.ts": "df1db3ffa6dd6d1252cc9617e5d72165cd2483df90e93833e13580687b6083c3",
+    "https://deno.land/std@0.138.0/path/_interface.ts": "ee3b431a336b80cf445441109d089b70d87d5e248f4f90ff906820889ecf8d09",
+    "https://deno.land/std@0.138.0/path/_util.ts": "c1e9686d0164e29f7d880b2158971d805b6e0efc3110d0b3e24e4b8af2190d2b",
+    "https://deno.land/std@0.138.0/path/common.ts": "bee563630abd2d97f99d83c96c2fa0cca7cee103e8cb4e7699ec4d5db7bd2633",
+    "https://deno.land/std@0.138.0/path/glob.ts": "cb5255638de1048973c3e69e420c77dc04f75755524cb3b2e160fe9277d939ee",
+    "https://deno.land/std@0.138.0/path/mod.ts": "d3e68d0abb393fb0bf94a6d07c46ec31dc755b544b13144dee931d8d5f06a52d",
+    "https://deno.land/std@0.138.0/path/posix.ts": "293cdaec3ecccec0a9cc2b534302dfe308adb6f10861fa183275d6695faace44",
+    "https://deno.land/std@0.138.0/path/separator.ts": "fe1816cb765a8068afb3e8f13ad272351c85cbc739af56dacfc7d93d710fe0f9",
+    "https://deno.land/std@0.138.0/path/win32.ts": "31811536855e19ba37a999cd8d1b62078235548d67902ece4aa6b814596dd757"
+  }
+}

update.ts

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+#!/bin/env -S deno run -A
+
+import * as path from "https://deno.land/std@0.138.0/path/mod.ts"
+
+main()
+async function main() {
+    const img_url = await find_daily_xkcd()
+    const tmp_dir = module_dir(import.meta) + "/tmp"
+    const dl_path = `${tmp_dir}/downloaded.png`
+    const bg_path = `${tmp_dir}/gen_${Date.now()}.png`
+    const curr_path = `${tmp_dir}/latest.png`
+    log("parameters", { img_url, tmp_dir, dl_path, bg_path, curr_path })
+    await run("mkdir", "-p", tmp_dir)
+    await download_file(img_url, dl_path)
+    await generate_wallpaper(dl_path, bg_path)
+    await set_wallpaper(bg_path)
+    await run("cp", bg_path, curr_path)
+    log("done")
+}
+
+async function find_daily_xkcd() {
+    const res = await fetch("https://xkcd.com/info.0.json")
+    const { img } = await res.json()
+    return img
+}
+
+async function download_file(url: string, dl_path: string) {
+    await run("wget", url, "-O", dl_path)
+}
+
+async function generate_wallpaper(src: string, dest: string) {
+    const [w, h] = await get_max_res()
+    await run(
+        "magick",
+        src,
+        ...["-gravity", "Center"],
+        ...["-extent", `${w}x${h}`],
+        ...["-background", "#ffffff"],
+        ...["-negate"],
+        ...["-level", "-50"],
+        ...["-brightness-contrast", "14x1"],
+        dest,
+    )
+}
+
+async function set_wallpaper(bg_path: string) {
+    const abs_path = path.resolve(bg_path)
+    await run(
+        "gsettings",
+        "set",
+        "org.cinnamon.desktop.background",
+        "picture-uri",
+        `file://${abs_path}`,
+    )
+}
+
+async function get_max_res() {
+    const output = await run("xrandr")
+    const stdout = (new TextDecoder()).decode(output.stdout)
+    const resolutions = [] as [number, number][]
+    for (const line of stdout.split("\n")) {
+        const [_, rest] = line.split(" connected ")
+        if (rest === undefined) continue
+        const stripped = rest.replace("primary", "")
+        const [res] = stripped.split("+")
+        const [w, h] = res.split("x").map((n) => parseInt(n))
+        resolutions.push([w, h])
+    }
+    const maxes = [0, 0] as [number, number]
+    for (const res of resolutions) {
+        maxes[0] = Math.max(res[0], maxes[0])
+        maxes[1] = Math.max(res[1], maxes[1])
+    }
+    return maxes
+}
+
+function log(...args: unknown[]) {
+    console.log("[download.ts]", ...args)
+}
+
+async function run(name: string, ...args: string[]) {
+    return await new Deno.Command(name, { args, stdout: "piped", stderr: "inherit" }).output()
+}
+
+function module_dir({ url }: ImportMeta): string {
+    return path.resolve(path.dirname(path.fromFileUrl(url)))
+}

wait-network-then-update

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+#!/bin/sh
+set -e
+cd "$(dirname "$(realpath "$0")")"
+
+
+until ping wikipedia.org -c 1
+do sleep 1s
+done
+
+
+./refresh.ts