1.0.27

src/lib/server/env-interpolation.ts

@@ -0,0 +1,36 @@
+/**
+ * Parse compose YAML to extract environment variable interpolation mappings.
+ * Returns pairs of [containerEnvKey, interpolationVariable].
+ *
+ * Handles patterns:
+ *   - VAR=${ref}
+ *   - VAR=${ref:-default}
+ *   - VAR=${ref:+alt}
+ *   - VAR=${ref?error}
+ *
+ * Only extracts from `environment:` sections (list format: `- KEY=value`).
+ */
+export function parseEnvInterpolation(composeContent: string): Array<[string, string]> {
+	const results: Array<[string, string]> = [];
+
+	// Step 1: Find lines matching `- ENV_KEY=...${...}...`
+	const linePattern = /^\s*-\s*([A-Za-z_][A-Za-z0-9_]*)=(.*)/gm;
+	let lineMatch;
+	while ((lineMatch = linePattern.exec(composeContent)) !== null) {
+		const containerKey = lineMatch[1];
+		const valueStr = lineMatch[2];
+
+		// Step 2: Extract all ${VAR} references from the value
+		const varPattern = /\$\{([A-Za-z_][A-Za-z0-9_]*)(?:[:\-\+\?][^}]*)?\}/g;
+		let varMatch;
+		while ((varMatch = varPattern.exec(valueStr)) !== null) {
+			const varName = varMatch[1];
+			// Only add if names differ — same-name case handled by direct key matching
+			if (containerKey !== varName) {
+				results.push([containerKey, varName]);
+			}
+		}
+	}
+
+	return results;
+}