add version command

build.rs

@@ -0,0 +1,15 @@
+use std::process::Command;
+
+fn main() {
+    // get
+    let output = Command::new("git").args(&["rev-parse", "--short", "HEAD"]).output()
+        .expect("git rev-parse HEAD failed");
+    let hash = String::from_utf8(output.stdout).expect("not UTF-8 output");
+
+    let output = Command::new("git").args(&["rev-parse", "--abbrev-ref", "HEAD"]).output()
+        .expect("git rev-parse HEAD failed");
+    let branch = String::from_utf8(output.stdout).expect("not UTF-8 output");
+
+    println!("cargo:rustc-env=GIT_HASH={}", hash);
+    println!("cargo:rustc-env=GIT_BRANCH={}", branch);
+}

src/commands/mod.rs

@@ -7,6 +7,7 @@ mod gambling;
 mod eval;
 pub mod self_roles;
 mod settings;
+mod version;
 
 use crate::common::{Data, Error, Context};
 
@@ -35,5 +36,6 @@ pub fn commands() -> Vec<Command<Data, Error>> {
         eval::eval(),
         self_roles::role(),
         settings::setting(),
+        version::version(),
     ]
 }

src/commands/version.rs

@@ -0,0 +1,8 @@
+use crate::common::{Context, Error};
+
+/// Tells you the current version of BigBirb
+#[poise::command(slash_command, prefix_command)]
+pub async fn version(ctx: Context<'_>) -> Result<(), Error> {
+    ctx.reply(format!("version {} ({}/{})", env!("CARGO_PKG_VERSION"), env!("GIT_BRANCH"), env!("GIT_HASH"))).await?;
+    Ok(())
+}