Replace Python script w/ Cargo script.

update.rs

@@ -0,0 +1,88 @@
+#!/usr/bin/env -S cargo +nightly -Zscript
+```cargo
+[dependencies]
+clap = { version = "4.4", features = ["derive"] }
+toml = { version = "0.8" }
+```
+
+use clap::Parser;
+use std::process::ExitCode;
+use std::fs::read_to_string;
+use std::error::Error;
+use toml::Table;
+use toml::from_str;
+
+#[derive(Parser, Debug)]
+#[clap(version)]
+struct Args {
+	#[arg(short = 'u')]
+	update: bool,
+
+	#[arg(short = 'g')]
+	generate: bool,
+}
+
+fn main() -> ExitCode {
+	let args = Args::parse();
+
+	return match (args.update, args.generate) {
+		(true, true) => {
+			eprintln!("error: can specify only one of --update and --generate");
+			ExitCode::FAILURE
+		}
+		(false, false) => {
+			eprintln!("error: must specify one of --update or --generate");
+			ExitCode::FAILURE
+		}
+		(true, false) => if let Err(err) = update() {
+			eprintln!("error: {}", err);
+			ExitCode::FAILURE
+		} else {
+			ExitCode::SUCCESS
+		},
+		(false, true) => if let Err(err) = generate() {
+			eprintln!("error: {}", err);
+			ExitCode::FAILURE
+		} else {
+			ExitCode::SUCCESS
+		},
+	}
+
+}
+
+/// Update the cached metadata.
+fn update() -> Result<(), Box<dyn Error>> {
+	/*
+	The intent of this function is that it will read
+	the `languages.toml` file, then filter down to the
+	ones that are on GitHub and update the metadata
+	file, found at `.data/stars.toml` with star data
+	based on the GitHub API responses, same deal with
+	`.data/active.toml`.
+	*/
+
+	let langs = toml_from_file("languages.toml")?;
+
+	Ok(())
+}
+
+/// Regenerate the README.
+fn generate() -> Result<(), Box<dyn Error>> {
+	/*
+	This takes the list of languages from
+	`languages.toml`, and also loads `.data/stars.toml`,
+	and uses the data from both to generate a new
+	`README.md` file.
+	*/
+
+	let langs = toml_from_file("languages.toml")?;
+
+	Ok(())
+}
+
+/// Read the TOML data from a file.
+fn toml_from_file(file: &str) -> Result<Table, Box<dyn Error>> {
+	Ok(from_str(&read_to_string(file)?)?)
+}
+
+