use libgit2 to track PRs (#10)v0.2.0

* nix: don't depend on registry for nixpkgs input

* use libgit2 to track PRs

* nix: don't use ci devShell as defaul

* crates: bump serenity from `9ad74d4` to `0.12.2

* nix: fix cross compiled builds

* crates: split more from client

* bot-jobs: update remote refs more efficiently

* git-tracker: account for HEAD commits

* bot-config: use nixpkgs branches from environment

* bot-commands: don't display branches prs haven't landed in

* git-tracker: return false when commits aren't found

this is annoying as a hard error since it turns out github will report
garbage merge commit SHAs for PRs that *haven't* been merged yet. yay

* bot: improve docs in some places

* bot-client: display invite link on start

* bot-http: add TeawieClientExt

* bot-commands: add /about

* docs: update readme todos

* nix: enable StateDirectory in module

* crates: bump to 0.2.0

1 files changed, 44 insertions, 0 deletions

diff --git a/crates/bot-commands/src/about.rs b/crates/bot-commands/src/about.rs
new file mode 100644
index 0000000..2e5efae
--- /dev/null
+++ b/crates/bot-commands/src/about.rs
@@ -0,0 +1,44 @@
+use bot_error::Error;
+use bot_http::TeawieClientExt;
+
+use serenity::builder::{
+	CreateCommand, CreateEmbed, CreateEmbedFooter, CreateInteractionResponse,
+	CreateInteractionResponseMessage,
+};
+use serenity::model::application::{CommandInteraction, InstallationContext};
+use serenity::prelude::Context;
+
+const VERSION: &str = env!("CARGO_PKG_VERSION");
+const REPOSITORY: &str = env!("CARGO_PKG_REPOSITORY");
+
+pub async fn respond(
+	ctx: &Context,
+	http: &bot_http::Client,
+	command: &CommandInteraction,
+) -> Result<(), Error> {
+	let mut embed = CreateEmbed::new()
+		.title("About nixpkgs-tracker-bot")
+		.description("I help track what branches PRs to nixpkgs have reached. If you've used [Nixpkgs Pull Request Tracker](https://nixpk.gs/pr-tracker.html), you probably know what this is about.")
+		.fields([
+			("Version", VERSION, true),
+			("Source code", &format!("[getchoo/nixpkgs-tracker-bot]({REPOSITORY})"), true),
+			("Issues/Feature Requests", &format!("[getchoo/nixpkgs-tracker-bot/issues]({REPOSITORY}/issues)"), true)
+	]);
+
+	if let Some(teawie_url) = http.random_teawie().await? {
+		let footer = CreateEmbedFooter::new("Images courtesy of @sympathytea");
+		embed = embed.image(teawie_url).footer(footer);
+	};
+
+	let message = CreateInteractionResponseMessage::new().embed(embed);
+	let response = CreateInteractionResponse::Message(message);
+	command.create_response(&ctx, response).await?;
+
+	Ok(())
+}
+
+pub fn register() -> CreateCommand {
+	CreateCommand::new("about")
+		.description("Learn more about me")
+		.add_integration_type(InstallationContext::User)
+}