refactor: dedupe cli config cron and install flows

src/infra/shell-inline-command.ts

@@ -0,0 +1,35 @@
+export const POSIX_INLINE_COMMAND_FLAGS = new Set(["-lc", "-c", "--command"]);
+export const POWERSHELL_INLINE_COMMAND_FLAGS = new Set(["-c", "-command", "--command"]);
+
+export function resolveInlineCommandMatch(
+  argv: string[],
+  flags: ReadonlySet<string>,
+  options: { allowCombinedC?: boolean } = {},
+): { command: string | null; valueTokenIndex: number | null } {
+  for (let i = 1; i < argv.length; i += 1) {
+    const token = argv[i]?.trim();
+    if (!token) {
+      continue;
+    }
+    const lower = token.toLowerCase();
+    if (lower === "--") {
+      break;
+    }
+    if (flags.has(lower)) {
+      const valueTokenIndex = i + 1 < argv.length ? i + 1 : null;
+      const command = argv[i + 1]?.trim();
+      return { command: command ? command : null, valueTokenIndex };
+    }
+    if (options.allowCombinedC && /^-[^-]*c[^-]*$/i.test(token)) {
+      const commandIndex = lower.indexOf("c");
+      const inline = token.slice(commandIndex + 1).trim();
+      if (inline) {
+        return { command: inline, valueTokenIndex: i };
+      }
+      const valueTokenIndex = i + 1 < argv.length ? i + 1 : null;
+      const command = argv[i + 1]?.trim();
+      return { command: command ? command : null, valueTokenIndex };
+    }
+  }
+  return { command: null, valueTokenIndex: null };
+}