mirror of https://github.com/jkjoy/sunpeiwen.git
64 lines
2.7 KiB
Markdown
64 lines
2.7 KiB
Markdown
# ncp - Asynchronous recursive file & directory copying
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[](http://travis-ci.org/AvianFlu/ncp)
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Think `cp -r`, but pure node, and asynchronous. `ncp` can be used both as a CLI tool and programmatically.
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## Command Line usage
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Usage is simple: `ncp [source] [dest] [--limit=concurrency limit]
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[--filter=filter] --stopOnErr`
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The 'filter' is a Regular Expression - matched files will be copied.
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The 'concurrency limit' is an integer that represents how many pending file system requests `ncp` has at a time.
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'stoponerr' is a boolean flag that will tell `ncp` to stop immediately if any
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errors arise, rather than attempting to continue while logging errors. The default behavior is to complete as many copies as possible, logging errors along the way.
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If there are no errors, `ncp` will output `done.` when complete. If there are errors, the error messages will be logged to `stdout` and to `./ncp-debug.log`, and the copy operation will attempt to continue.
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## Programmatic usage
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Programmatic usage of `ncp` is just as simple. The only argument to the completion callback is a possible error.
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```javascript
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var ncp = require('ncp').ncp;
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ncp.limit = 16;
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ncp(source, destination, function (err) {
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if (err) {
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return console.error(err);
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}
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console.log('done!');
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});
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```
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You can also call ncp like `ncp(source, destination, options, callback)`.
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`options` should be a dictionary. Currently, such options are available:
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* `options.filter` - a `RegExp` instance, against which each file name is
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tested to determine whether to copy it or not, or a function taking single
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parameter: copied file name, returning `true` or `false`, determining
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whether to copy file or not.
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* `options.transform` - a function: `function (read, write) { read.pipe(write) }`
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used to apply streaming transforms while copying.
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* `options.clobber` - boolean=true. if set to false, `ncp` will not overwrite
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destination files that already exist.
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* `options.dereference` - boolean=false. If set to true, `ncp` will follow symbolic
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links. For example, a symlink in the source tree pointing to a regular file
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will become a regular file in the destination tree. Broken symlinks will result in
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errors.
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* `options.stopOnErr` - boolean=false. If set to true, `ncp` will behave like `cp -r`,
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and stop on the first error it encounters. By default, `ncp` continues copying, logging all
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errors and returning an array.
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* `options.errs` - stream. If `options.stopOnErr` is `false`, a stream can be provided, and errors will be written to this stream.
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Please open an issue if any bugs arise. As always, I accept (working) pull requests, and refunds are available at `/dev/null`.
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