1 files changed, 59 insertions, 0 deletions
diff --git a/u/process/exec.ts b/u/process/exec.ts
new file mode 100644
index 0000000..a2cdbca
--- /dev/null
+++ b/u/process/exec.ts
@@ -0,0 +1,59 @@
+import {
+    Either,
+    IEither,
+    type ITraceable,
+    LogLevel,
+    LogMetricTraceSupplier,
+    Metric,
+    TraceUtil,
+} from '@emprespresso/pengueno';
+import { promisify } from 'node:util';
+import { exec as execCallback } from 'node:child_process';
+const exec = promisify(execCallback);
+
+export type Command = string[] | string;
+export type StdStreams = { stdout: string; stderr: string };
+
+export const CmdMetric = Metric.fromName('Exec').asResult();
+type Environment = Record<string, string>;
+type Options = { env?: Environment; clearEnv?: boolean };
+export const getStdout = (
+    cmd: ITraceable<Command, LogMetricTraceSupplier>,
+    options: Options = {},
+): Promise<IEither<Error, string>> =>
+    cmd
+        .flatMap(TraceUtil.withFunctionTrace(getStdout))
+        .flatMap((tCmd) => tCmd.traceScope(() => `Command = ${tCmd.get()}`))
+        .map((tCmd) => {
+            const cmd = tCmd.get();
+            const _exec = typeof cmd === 'string' ? cmd : cmd.join(' ');
+            const env = options.clearEnv ? options.env : { ...process.env, ...options.env };
+            return Either.fromFailableAsync<Error, StdStreams>(exec(_exec, { env }));
+        })
+        .map(
+            TraceUtil.promiseify((tEitherStdStreams) =>
+                tEitherStdStreams.get().mapRight(({ stderr, stdout }) => {
+                    if (stderr) tEitherStdStreams.trace.traceScope(LogLevel.DEBUG).trace(`StdErr = ${stderr}`);
+                    return stdout;
+                }),
+            ),
+        )
+        .peek(TraceUtil.promiseify(TraceUtil.traceResultingEither(CmdMetric)))
+        .get();
+
+export const getStdoutMany = (
+    cmds: ITraceable<Array<Command>, LogMetricTraceSupplier>,
+    options: Options = {},
+): Promise<IEither<Error, Array<string>>> =>
+    cmds
+        .coExtend((t) => t.get())
+        .reduce(
+            async (_result, tCmd) => {
+                const result = await _result;
+                return result.joinRightAsync(
+                    () => tCmd.map((cmd) => getStdout(cmd, options)).get(),
+                    (stdout, pre) => pre.concat(stdout),
+                );
+            },
+            Promise.resolve(Either.right<Error, Array<string>>([])),
+        );