|
|
- spawn-error-forwarder [![Build Status](https://travis-ci.org/bendrucker/spawn-error-forwarder.svg?branch=master)](https://travis-ci.org/bendrucker/spawn-error-forwarder)
- =====================
-
- Emit errors on stdout stream for a spawned child process. Useful for capturing errors from a spawned process when you want the output from stdout.
-
- ## Setup
- ```bash
- $ npm install spawn-error-forwarder
- ```
-
- ## API
-
- #### `fwd(child [, errFactory]` -> `child`
-
- Buffers `child.stderr` output. If the spawned process exits with a code `> 0`, the buffered output of `child.stderr` is used to generate an error which is emitted on `child.stdout`. By default, the error message is the output of `child.stderr`. If you provide an `errFactory` function, it will be called with `code, stderr` where `code` is the child's exit code and `stderr` is string that contains the output of `child.stderr`. `errFactory` should return an `Error` to be emitted on `child.stdout`.
-
- ## Example
-
- ```js
- var fwd = require('spawn-error-forwarder');
- var spawn = require('child_process').spawn;
- var child = spawn('git', ['log', 'non-existent-path']);
-
- fwd(child, function (code, stderr) {
- return new Error('git log exited with ' + code + ':\n\n' + stderr);
- });
-
- child.stdout
- .on('error', console.error.bind(console))
- .pipe(process.stdout);
- ```
-
- We want to pipe the output of `git log` to `process.stdout` but since we're providing a path that doesn't exist git will exit with a non-zero code and we'll log its output with `console.error`.
|