1 files changed, 20 insertions, 8 deletions
diff --git a/utils/run.ts b/utils/run.ts
index 60ae1e6..06e7d9f 100644
--- a/utils/run.ts
+++ b/utils/run.ts
@@ -1,7 +1,10 @@
+import { Either } from "./mod.ts";
+
+export class ProcessError extends Error {}
 export const getStdout = async (
   cmd: string[] | string,
   options: Deno.CommandOptions = {},
-): Promise<string> => {
+): Promise<Either<ProcessError, string>> => {
   const [exec, ...args] = (typeof cmd === "string") ? cmd.split(" ") : cmd;
   const command = new Deno.Command(exec, {
     args,
@@ -10,12 +13,21 @@ export const getStdout = async (
     ...options,
   });
 
-  const { code, stdout, stderr } = await command.output();
-
-  const stdoutText = new TextDecoder().decode(stdout);
-  const stderrText = new TextDecoder().decode(stderr);
-
-  if (code !== 0) throw new Error(`command failed\n${stderrText}`);
+  try {
+    const { code, stdout, stderr } = await command.output();
+    const stdoutText = new TextDecoder().decode(stdout);
+    const stderrText = new TextDecoder().decode(stderr);
 
-  return stdoutText;
+    if (code !== 0) {
+      return Either.left<ProcessError, string>(
+        new ProcessError(`command failed\n${stderrText}`),
+      );
+    }
+    return Either.right<ProcessError, string>(stdoutText);
+  } catch (e) {
+    if (e instanceof Error) {
+      return Either.left<ProcessError, string>(e);
+    }
+    throw new Error("unknown error " + e);
+  }
 };