everything

src/lib/meow.ts

@@ -0,0 +1,62 @@
+export interface ArgEvaluatable {
+	enabled(): boolean;
+	envs(): EnvVar[];
+	binary(): string;
+	prefix(): string;
+	suffix(): string;
+	priority(): number;
+	arguments(): Arguments[];
+}
+
+export type EnvVar = {
+	var: string;
+	val: string;
+};
+
+export type Arguments = {
+	arg: string;
+	val: string;
+	prio: number;
+	/** Fixed value set — renders a dropdown in the UI instead of a text input. */
+	values?: string[];
+	/** JS regex source the value input must match (HTML pattern attr); empty/cleared always valid. */
+	pattern?: string;
+};
+
+function compareArgPrio(a: Arguments, b: Arguments) {
+	return a.prio - b.prio;
+}
+
+export class ArgEval {
+	Components: ArgEvaluatable[];
+
+	constructor(components: ArgEvaluatable[]) {
+		this.Components = components;
+	}
+
+	public eval(): string {
+		const active = this.Components.filter((c) => c.enabled());
+
+		const env = active.flatMap((c) => c.envs().map((e) => e.var + '=' + e.val)).join(' ');
+
+		const progs = [...active]
+			.sort((a, b) => a.priority() - b.priority())
+			.map((c) =>
+				[
+					c.prefix(),
+					c.binary(),
+					...c
+						.arguments()
+						.sort(compareArgPrio)
+						.flatMap((a) => (a.val ? `${a.arg} ${a.val}` : a.arg)),
+					c.suffix()
+				]
+					.filter((s) => s !== '')
+					.join(' ')
+			)
+			.filter((s) => s !== '')
+			.join(' ');
+
+		return [env, progs, '%command%'].filter((s) => s !== '').join(' ');
+	}
+}