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, 36 insertions, 0 deletions

diff --git a/crates/bot-config/src/lib.rs b/crates/bot-config/src/lib.rs
new file mode 100644
index 0000000..0691884
--- /dev/null
+++ b/crates/bot-config/src/lib.rs
@@ -0,0 +1,36 @@
+use std::env;
+
+/// The Discord client's configuration
+#[derive(Clone, Debug)]
+pub struct Config {
+	/// Path to clone a new or use an existing nixpkgs repository
+	pub nixpkgs_path: String,
+	// A comma separated list of nixpkgs branch to track commits for
+	pub nixpkgs_branches: Vec<String>,
+}
+
+impl Config {
+	/// Take in a comma separated list and split it into a [`Vec<String>`]
+	fn split_string_list(branches: &str) -> Vec<String> {
+		branches
+			.split(',')
+			.map(|branch| branch.trim().to_string())
+			.collect()
+	}
+
+	/// Create a new instance of [`Config`] based on variables from the environment
+	///
+	/// # Errors
+	///
+	/// Will return [`Err`] if a variable is not found
+	pub fn from_env() -> Result<Self, env::VarError> {
+		let nixpkgs_path = env::var("BOT_NIXPKGS_PATH")?;
+		let nixpkgs_branches_raw = env::var("BOT_NIXPKGS_BRANCHES")?;
+		let nixpkgs_branches = Self::split_string_list(&nixpkgs_branches_raw);
+
+		Ok(Self {
+			nixpkgs_path,
+			nixpkgs_branches,
+		})
+	}
+}