initial 2 commit

src/config/env/file.ts

@@ -0,0 +1,55 @@
+import { exists, readFile } from 'node:fs/promises'
+import { InvalidEnvFileLine } from '../../errors'
+import { setByPath } from '../../utils/path'
+import { relativePath } from '../resolution'
+
+export function parseFile(contents: string) {
+  const variables: Record<string, string> = {}
+  const lines = contents
+    .trim()
+    .split('\n')
+    .map((l) => l.trim())
+  const matcher = /^\s*(?<variable>\w+)\s*=(?<value>.*)$/
+  for (const line of lines) {
+    if (!line) continue
+    const match = matcher.exec(line)
+    if (!match) throw new InvalidEnvFileLine(line)
+    variables[match.groups!.variable] = match.groups!.value.trim()
+  }
+  return variables
+}
+
+const PREFIX = 'AUTORESTIC_'
+
+function envVariableToObjectPath(env: string): string {
+  if (env.startsWith(PREFIX)) env = env.replace(PREFIX, '')
+  return (
+    env
+      // Convert to object path
+      .replaceAll('_', '.')
+      // Escape the double unterscore. __ -> .. -> _
+      .replaceAll('..', '_')
+      .toLowerCase()
+  )
+}
+
+/**
+ * Fill the config file with the env file variables.
+ * These take precedence before the config file itself.
+ */
+export async function enrichConfig(rawConfig: any, path: string) {
+  const envFilePath = relativePath(path, '.autorestic.env')
+  let variables: Record<string, string> = {}
+
+  if (await exists(envFilePath)) {
+    const envFile = parseFile(await readFile(envFilePath, 'utf-8'))
+    Object.assign(variables, envFile)
+  }
+
+  Object.assign(variables, process.env)
+
+  for (const [key, value] of Object.entries(variables)) {
+    if (!key.startsWith(PREFIX)) continue
+    setByPath(rawConfig, envVariableToObjectPath(key), value)
+  }
+}