opt-commands: add uwurandom (#112)

* opt-commands: add uwurandom

* Apply suggestions from code review

Co-authored-by: seth <[email protected]>

* opt-commands: set random default value for uwurandom

---------

Co-authored-by: seth <[email protected]>

4 files changed, 87 insertions, 1 deletions

diff --git a/Cargo.lock b/Cargo.lock
index 75a29ba..97628fc 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -263,6 +263,15 @@ dependencies = [
 ]
 
 [[package]]
+name = "convert_case"
+version = "0.6.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ec182b0ca2f35d8fc196cf3404988fd8b8c739a4d270ff118a398feb0cbec1ca"
+dependencies = [
+ "unicode-segmentation",
+]
+
+[[package]]
 name = "core-foundation"
 version = "0.9.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -1712,6 +1721,7 @@ dependencies = [
  "serde_json",
  "tokio",
  "url",
+ "uwurandom-rs",
 ]
 
 [[package]]
@@ -2000,6 +2010,12 @@ dependencies = [
 ]
 
 [[package]]
+name = "unicode-segmentation"
+version = "1.10.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1dd624098567895118886609431a7c3b8f516e41d30e0643f03d94592a147e36"
+
+[[package]]
 name = "unicode-width"
 version = "0.1.11"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -2036,6 +2052,29 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "09cc8ee72d2a9becf2f2febe0205bbed8fc6615b7cb429ad062dc7b7ddd036a9"
 
 [[package]]
+name = "uwurandom-proc-macros"
+version = "1.0.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "04ffa647cfeda30cf8659b18f9b7d96199d3439f6336ac52621249aca7b5375e"
+dependencies = [
+ "convert_case",
+ "quote",
+ "serde",
+ "serde_json",
+ "syn 1.0.109",
+]
+
+[[package]]
+name = "uwurandom-rs"
+version = "1.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d1d88a4d544a6204e9e83517522d7e6dc2007241272e7dfd647b307b41104b4b"
+dependencies = [
+ "rand_core 0.6.4",
+ "uwurandom-proc-macros",
+]
+
+[[package]]
 name = "valuable"
 version = "0.1.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
diff --git a/Cargo.toml b/Cargo.toml
index df20b66..cde19f4 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -33,3 +33,4 @@ tokio = { version = "1.35.1", features = [
 	"signal",
 ] }
 url = { version = "2.5.0", features = ["serde"] }
+uwurandom-rs = "1.1.0"
diff --git a/src/commands/optional/mod.rs b/src/commands/optional/mod.rs
index 2be1fef..8ef7757 100644
--- a/src/commands/optional/mod.rs
+++ b/src/commands/optional/mod.rs
@@ -5,7 +5,12 @@ use poise::Command;
 
 mod copypasta;
 mod teawiespam;
+mod uwurandom;
 
 pub fn to_commands() -> Vec<Command<Data, Report>> {
-	vec![copypasta::copypasta(), teawiespam::teawiespam()]
+	vec![
+		copypasta::copypasta(),
+		teawiespam::teawiespam(),
+		uwurandom::uwurandom(),
+	]
 }
diff --git a/src/commands/optional/uwurandom.rs b/src/commands/optional/uwurandom.rs
new file mode 100644
index 0000000..c8405a0
--- /dev/null
+++ b/src/commands/optional/uwurandom.rs
@@ -0,0 +1,41 @@
+use crate::Context;
+
+use color_eyre::eyre::Result;
+use log::debug;
+use rand::Rng;
+
+/// Generate some amount of uwurandom
+#[poise::command(slash_command)]
+pub async fn uwurandom(
+	ctx: Context<'_>,
+	#[description = "The amount of uwurandom to generate"]
+	#[min = 1]
+	#[max = 2000]
+	length: Option<u16>,
+) -> Result<()> {
+	let gid = ctx.guild_id().unwrap_or_default();
+	let settings = ctx.data().storage.get_guild_settings(&gid).await?;
+
+	if !settings.optional_commands_enabled {
+		debug!("Not running uwurandom in {gid} since it's disabled");
+		ctx.say("I'm not allowed to do that here").await?;
+		return Ok(());
+	}
+
+	let length = length.unwrap_or(rand::thread_rng().gen_range(1..50));
+
+	let mut result = String::with_capacity(length as usize);
+	// ThreadRng is not Send(obviously), and rustc is slightly too paranoid about rng spilling to await point
+	// So calm it by constraining it to a block
+	{
+		let mut rng = rand::thread_rng();
+		let mut state_machine = uwurandom_rs::StateMachine::new(&mut rng);
+		for _ in 0..length {
+			let generated;
+			(state_machine, generated) = state_machine.generate(&mut rng);
+			result.push(generated);
+		}
+	}
+	ctx.say(result).await?;
+	Ok(())
+}