Salvatore's Blog

should be

tmux attach -t base || tmux new -s base
# .zshrc, line ~73
plugins=(
  asdf
  brew
  git
  z
)
# $HOME/.asdfrc
legacy_version_file = yes
sal.dev on  main [!?] via 💎 v2.7.8
❯
~
❯ z ad

advent-of-code-2023
❯
git branch --merged main | grep -v "\* main" | xargs -n 1 git branch -d
❯ ls $ANDROID_HOME/ndk
23.1.7779620    25.2.9519653
❯ NDK_PATH=$ANDROID_HOME/ndk/25.2.9519653
# if your NDK version is ≥ 23 run this
# snippet that fixes the "broken" NDK issue
❯ find $NDK_PATH -name 'libunwind.a' | \
  sed 's@libunwind.a$@libgcc.a@' | \
  while read x; do
    echo "INPUT(-lunwind)" > $x
  done
❯ find $NDK_PATH/toolchains/llvm -name "*-linux-android*-clang" | sort -r
$NDK_PATH/path/to/aarch64-linux-android33-clang
$NDK_PATH/path/to/aarch64-linux-android32-clang
$NDK_PATH/path/to/aarch64-linux-android31-clang
# ...
❯ find $NDK_PATH/toolchains/llvm -name "*-linux-android*24-clang" | sort -r
$NDK_PATH/path/to/x86_64-linux-android24-clang
$NDK_PATH/path/to/i686-linux-android24-clang
$NDK_PATH/path/to/armv7a-linux-androideabi24-clang
$NDK_PATH/path/to/aarch64-linux-android24-clang
# ~/.cargo/config
# ...
[target.x86_64-linux-android]
linker = "/Users/sal/Library/Android/sdk/ndk/25.2.9519653/toolchains/llvm/prebuilt/darwin-x86_64/bin/x86_64-linux-android24-clang"

[target.i686-linux-android]
linker = "/Users/sal/Library/Android/sdk/ndk/25.2.9519653/toolchains/llvm/prebuilt/darwin-x86_64/bin/i686-linux-android24-clang"

[target.armv7-linux-androideabi]
linker = "/Users/sal/Library/Android/sdk/ndk/25.2.9519653/toolchains/llvm/prebuilt/darwin-x86_64/bin/armv7a-linux-androideabi24-clang"

[target.aarch64-linux-android]
linker = "/Users/sal/Library/Android/sdk/ndk/25.2.9519653/toolchains/llvm/prebuilt/darwin-x86_64/bin/aarch64-linux-android24-clang"
❯ rustup target add \
    x86_64-linux-android \
    i686-linux-android \
    armv7-linux-androideabi \
    aarch64-linux-android
cargo new reverse-rs --lib
# reverse-rs/src/lib.rs
pub fn reverse_string(input_string: &str) -> String {
    input_string.chars().rev().collect()
}

pub fn reverse_integer(input_integer: i32) -> i32 {
    let reversed = input_integer.to_string().chars().rev().collect::<String>();
    reversed.parse::<i32>().unwrap()
}

#[cfg(test)]
mod tests {
    use super::*;

    #[test]
    fn it_reverses_strings() {
        let result = reverse_string("hello world");
        assert_eq!(result, "dlrow olleh");
    }

    #[test]
    fn it_reverses_integers() {
        let result = reverse_integer(123);
        assert_eq!(result, 321);
    }
}
# reverse-rs/Cargo.toml
[package]
name = "reverse-rs"
version = "0.1.0"
edition = "2021"

[lib]
name = "reverse"
crate-type = ["cdylib"]

[dependencies]
uniffi = { version = "0.23.0" }

[build-dependencies]
uniffi = { version = "0.23.0", features = [ "build" ] }
// reverse-rs/src/reverse.udl
namespace reverse {
  string reverse_string([ByRef] string input_string);
  i32 reverse_integer(i32 input_integer);
};
# reverse-rs/build.rs
fn main() {
    uniffi::generate_scaffolding("./src/reverse.udl").unwrap();
}
# reverse-rs/src/lib.rs
uniffi::include_scaffolding!("reverse");

pub fn reverse_string(input_string: &str) -> String {
// ...
# reverse-rs/
# if you're using cross (step 1, option A)
❯ cross build --target x86_64-linux-android && \
    cross build --target i686-linux-android && \
    cross build --target armv7-linux-androideabi && \
    cross build --target aarch64-linux-android

# if you have the NDK setup (step 1, option B)
❯ cargo build --lib \
    --target x86_64-linux-android \
    --target i686-linux-android \
    --target armv7-linux-androideabi \
    --target aarch64-linux-android
# reverse-rs/
❯ for binary in target/*/*/libreverse.so; do file $binary; done
target/aarch64-linux-android/debug/libreverse.so: ELF 64-bit LSB shared object, ARM aarch64, version 1 (SYSV), dynamically linked, with debug_info, not stripped
target/armv7-linux-androideabi/debug/libreverse.so: ELF 32-bit LSB shared object, ARM, EABI5 version 1 (SYSV), dynamically linked, with debug_info, not stripped
target/i686-linux-android/debug/libreverse.so: ELF 32-bit LSB shared object, Intel 80386, version 1 (SYSV), dynamically linked, with debug_info, not stripped
target/x86_64-linux-android/debug/libreverse.so: ELF 64-bit LSB shared object, x86-64, version 1 (SYSV), dynamically linked, with debug_info, not stripped
# reverse-rs/
❯ mkdir -p jniLibs/arm64-v8a/ && \
  cp target/aarch64-linux-android/debug/libreverse.so jniLibs/arm64-v8a/libuniffi_reverse.so && \
  mkdir -p jniLibs/armeabi-v7a/ && \
    cp target/armv7-linux-androideabi/debug/libreverse.so jniLibs/armeabi-v7a/libuniffi_reverse.so && \
  mkdir -p jniLibs/x86/ && \
    cp target/i686-linux-android/debug/libreverse.so jniLibs/x86/libuniffi_reverse.so && \
  mkdir -p jniLibs/x86_64/ && \
    cp target/x86_64-linux-android/debug/libreverse.so jniLibs/x86_64/libuniffi_reverse.so
# reverse-rs/
❯ tree jniLibs
jniLibs
├── arm64-v8a
│   └── libuniffi_reverse.so
├── armeabi-v7a
│   └── libuniffi_reverse.so
├── x86
│   └── libuniffi_reverse.so
└── x86_64
    └── libuniffi_reverse.so

5 directories, 4 files
# reverse-rs/Cargo.toml
# ...

[[bin]]
name = "uniffi-bindgen"
path = "uniffi-bindgen.rs"
# reverse-rs/uniffi-bindgen.rs
fn main() {
    uniffi::uniffi_bindgen_main()
}
# reverse-rs/
❯ cargo run --features=uniffi/cli \
    --bin uniffi-bindgen \
    generate src/reverse.udl \
    --language kotlin
// reverse-rs/src/uniffi/reverse/reverse.kt
// ...
fun `reverseString`(`inputString`: String): String {
    return FfiConverterString.lift(
    rustCall() { _status ->
    _UniFFILib.INSTANCE.reverse_b8c9_reverse_string(FfiConverterString.lower(`inputString`), _status)
})
}

fun `reverseInteger`(`inputInteger`: Int): Int {
    return FfiConverterInt.lift(
    rustCall() { _status ->
    _UniFFILib.INSTANCE.reverse_b8c9_reverse_integer(FfiConverterInt.lower(`inputInteger`), _status)
})
}
// reverse-android/app/build.gradle
// ...
dependencies {
  // ...
  implementation "net.java.dev.jna:jna:5.13.0@aar"
  // ...
}
class MainActivity : AppCompatActivity() {
  override fun onCreate(savedInstanceState: Bundle?) {
    // ...
    val helloWorld = uniffi.reverse.reverseString("Hello World!")
    val oneTwoThree = uniffi.reverse.reverseInteger(123)
    textView.text = "'Hello World!' & '123' becomes '$helloWorld' & '$oneTwoThree'"
  }
}
❯ ls -lh target/*/*/libreverse.so
 37M target/aarch64-linux-android/debug/libreverse.so
4.2M target/aarch64-linux-android/release/libreverse.so

 35M target/armv7-linux-androideabi/debug/libreverse.so
3.5M target/armv7-linux-androideabi/release/libreverse.so

 34M target/i686-linux-android/debug/libreverse.so
3.5M target/i686-linux-android/release/libreverse.so

 37M target/x86_64-linux-android/debug/libreverse.so
4.0M target/x86_64-linux-android/release/libreverse.so
fly launch --image salvatoret/fly-pleroma:v2.4.4
fly open
fly ips allocate-v4
fly ips allocate-v6
fly certs create <your-domain>
fly volumes create pleroma_storage --size 1
[env]
  PLEROMA_CONFIG_PATH = "/mount/config/config.exs"

[mounts]
  source = "pleroma_storage"
  destination = "/mount"
fly deploy
fly ssh console --command "su pleroma --shell /bin/bash"
# from the `fly shell console`
/opt/pleroma/bin/pleroma_ctl instance gen \
  --output /mount/config/config.exs \
  --output-psql /tmp/setup_db.psql \
  --dbname pleroma \
  --dbuser postgres \
  --rum N \
  --uploads-dir /mount/uploads \
  --static-dir /mount/static \
  --listen-ip 0.0.0.0 \
  --listen-port 8080
# still in the `fly shell console`
psql -f /tmp/setup_db.psql $DATABASE_URL
# from the `fly shell console`
vim +27 /mount/config/config.exs
config :pleroma, Pleroma.Repo,
  adapter: Ecto.Adapters.Postgres,
  username: "postgres",
  # ...
config :pleroma, Pleroma.Repo,
  adapter: Ecto.Adapters.Postgres,
  ssl: false,
  socket_options: [:inet6],
  username: "postgres",
  # ...
# still in the `fly shell console`
/opt/pleroma/bin/pleroma_ctl migrate
exit
flyctl ssh sftp get /mount/config/config.exs config.exs
[env]
  # ...
  START_PLEROMA = "1"
fly deploy
fly open
fly ssh console --command "su pleroma --shell /bin/bash"
# from the server
/opt/pleroma/bin/pleroma_ctl user new <username> <email-address> --admin
exit
defaults write com.apple.screencapture disable-shadow -bool true; killall SystemUIServer
defaults write com.apple.screencapture disable-shadow -bool false; killall SystemUIServer
defaults write com.apple.screencapture type jpg; killall SystemUIServer
defaults write com.apple.screencapture type png; killall SystemUIServer
montage <image1> <image2> -tile 2x1 -geometry +20+20 -background none <ouput.png>
brew create https://github.com/Kotlin/kotlin-interactive-shell/archive/refs/tags/v0.3.3.tar.gz
class KotlinInteractiveShell < Formula
  desc "Kotlin Language Interactive Shell"
  url "https://github.com/Kotlin/kotlin-interactive-shell/archive/refs/tags/v0.3.3.tar.gz"
  sha256 "46913b17c85711213251948342d0f4d0fec7dc98dd11c1f24eedb0409338e273"
  license "Apache-2.0"

  def install
    # ...
  end

  test do
    # ...
  end
end
depends_on "maven" => :build
depends_on "openjdk"
def install
  system "mvn", "-DskipTests", "package"
  libexec.install "lib/ki-shell.jar"
  bin.write_jar_script libexec/"ki-shell.jar", "ki"
end
brew install --build-from-source ki
$ ki
ki-shell 0.3/1.4.32
type :h for help
[0] :q

Bye!
test do
  output = pipe_output(bin/"ki", ":q")
  assert_match "ki-shell", output
  assert_match "Bye!", output
end
brew audit --strict --online ki
class MyWallpaperService : WallpaperService() {
  override fun onCreateEngine(): Engine = WallpaperEngine()

  inner class WallpaperEngine : WallpaperService.Engine() {
  }
}
<?xml version="1.0" encoding="utf-8"?>
<wallpaper />
<?xml version="1.0" encoding="utf-8"?>
<manifest>
  <!--  ... some stuff ...  -->

  <uses-feature
      android:name="android.software.live_wallpaper"
      android:required="true" />

  <!--  ... other stuff  -->
</manifest>
<?xml version="1.0" encoding="utf-8"?>
<manifest>
  <application>
    <!-- ... some stuff ... -->

    <service
        android:name="MyWallpaperService"
        android:enabled="true"
        android:permission="android.permission.BIND_WALLPAPER">
      <intent-filter>
        <action android:name="android.service.wallpaper.WallpaperService" />
      </intent-filter>

      <meta-data
          android:name="android.service.wallpaper"
          android:resource="@xml/my_wallpaper" />
    </service>

    <!-- ... other stuff ... -->
  </application>
</manifest>
val intent = Intent(WallpaperManager.ACTION_CHANGE_LIVE_WALLPAPER)
intent.putExtra(
    WallpaperManager.EXTRA_LIVE_WALLPAPER_COMPONENT,
    ComponentName(this, MyWallpaperService::class.java)
)
startActivity(intent)
class MyWallpaperService : WallpaperService() {
  override fun onCreateEngine(): Engine = WallpaperEngine()

  private inner class WallpaperEngine : WallpaperService.Engine() {

    override fun onSurfaceCreated(holder: SurfaceHolder) {
      val canvas = holder.lockCanvas()
      // ... do ✨art✨ stuff
      holder.unlockCanvasAndPost(canvas)
    }
  }
}
override fun onSurfaceCreated(holder: SurfaceHolder) {
  val canvas = holder.lockCanvas()
  val paint = Paint().apply {
    color = Color.CYAN
    style = Paint.Style.FILL
  }
  canvas.drawPaint(paint)
  holder.unlockCanvasAndPost(canvas)
}
class MyWallpaperService : WallpaperService() {
  override fun onCreateEngine(): Engine = WallpaperEngine()

  private inner class WallpaperEngine : WallpaperService.Engine() {

    override fun onTouchEvent(event: MotionEvent?) {
      // on finder press events
      if (event?.action == MotionEvent.ACTION_DOWN) {
        // get the canvas from the Engine or leave
        val canvas = surfaceHolder?.lockCanvas() ?: return
        // ... do ✨art✨ stuff
        // update the surface
        surfaceHolder.unlockCanvasAndPost(canvas)
      }
    }
  }
}
// value between #000000 and #FFFFFF
val randomColor = Random.nextInt(16_777_216)
  // convert it to hex/base 16
  .toString(16)
  // gurantee it's six characters long
  .padStart(6, '0')
  // still need to prefix with a '#',
  // but you get the idea.
class MyWallpaperService : WallpaperService() {
  override fun onCreateEngine(): Engine = WallpaperEngine()

  private inner class WallpaperEngine : WallpaperService.Engine() {

    override fun onTouchEvent(event: MotionEvent?) {
      if (event?.action == MotionEvent.ACTION_DOWN) {
        val canvas = surfaceHolder?.lockCanvas() ?: return

        val paint = Paint().apply {
          val randomColor = Random.nextInt(16_777_216)
            .toString(16)
            .padStart(6, '0')
          color = Color.parseColor("#$randomColor")
          style = Paint.Style.FILL
        }
        canvas.drawPaint(paint)

        surfaceHolder.unlockCanvasAndPost(canvas)
      }
    }
  }
}
~ $ openssl sha -sha256 ~/Downloads/2017-11-29-raspbian-stretch.zip
SHA256(/Users/sal/Downloads/2017-11-29-raspbian-stretch.zip)= 64c4103316efe2a85fd2814f2af16313abac7d4ad68e3d95ae6709e2e894cc1b

~ $ cd /Volumes/boot/
boot $ touch ssh

pi@raspberrypi:~ $ curl https://sh.rustup.rs > install-rust.sh
pi@raspberrypi:~ $ openssl sha256 install-rust.sh
SHA256(install-rust.sh)= 22aa1f7f4c4b9be99a9d7e13ad45b2aec6714165a0578dd5ef81ca11f55ea24e
pi@raspberrypi:~ $ bash install-rust.sh

cargo run --release --bin compute

Killed

Writing your contribution to `./response`...
Done!

Your contribution has been written to `./response`

The BLAKE2b hash of `./response` is:
        1f65d9db a726e65f 96e97235 3eb58707
        48bf26e2 d04575b4 e2f95cd6 5ce4fb65
        c7157dfe 497559b9 bd8f453a 6fbe1c68
        daced14e 09e51975 64773fdb 437d8ac7

Salvatore's Blog

Setting Up macOS for a Developer

Applications

iTerm2

1Password

Folders

~/Developer

~/Screenshots

Developer Tools

Oh My Zsh

asdf

Homebrew

Starship

z

Other

Addendum

Running Rust on Android with UniFFI

Background

Step 1 - Configure your Rust + NDK environment

Option A - Use Docker-based cross

Option B - Configure Android NDK locally

Step 2 - Make a Rust library

Step 3 - Prepare the Rust for Android

Update dependencies

Write the UDL file

Write the Rust generator

Step 4 - Compile the Rust library

Step 5 - Generate the Kotlin methods

Step 6 - Create the Android app

Add the JNA dependency

Copy over generated files

Use the generate Kotlin library

Bonus - Suggestions and Resources

Optimize with --release

Move uniffi-bindgen to its own crate

Helpful Docker guide

More than just UniFFI

2023-07-05 Update

Thank you to my friends

Let me know what you think!

Set up a free Mastodon-ready server in under 20 minutes with Pleroma + Fly.io

Instructions

1. Initiate the Fly.io app 🐣

2. (Optional) Configure DNS and Certs 🏷

3. Create storage 📦

4. Generate your configs 🧙

5. Configure the database 🗄

6. Launch the (empty) Pleroma instance! 🚀

7. Add yourself and configure 🪞

8. Celebrate! 🎉

Operating Notes

Resources I found helpful

Bonus

Bonus Bonus

Extra credit

4 macOS Screenshot Tricks To Impress Your Co-Workers

1. Store screenshots in a folder on your Dock 📂

2. Remove screenshot shadow 🕶

3. Take screenshots as JPEGs, not PNGs ⚖️

4. Show side-by-side comparisons with ImageMagick 🧑‍🤝‍🧑

How I added the Kotlin Interactive Shell to Homebrew (and you can too)

How does Homebrew work?

Creating the Ki formula

Build Ki locally (think globally)

Test it out

Open the pull request

Look around and borrow

How to make a live wallpaper on Android

Background on Backgrounds

Step 0 - Prep an Android project

Step 1 - Initialize the WallpaperService

Step 2 - Modify your various XML files

Step 3 - Launch your empty wallpaper

Step 4 - Have fun with ✨art✨

Solid Background

It’s (a)live!

Keep going!

Powers of Tau Ceremony

What is the Powers of Tau Ceremony?

Why did I do it?

Option A - Use Docker-based `cross`

Optimize with `--release`

Move `uniffi-bindgen` to its own crate