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# copy-concurrently
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Copy files, directories and symlinks
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```
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const copy = require('copy-concurrently')
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copy('/path/to/thing', '/new/path/thing').then(() => {
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// this is now copied
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}).catch(err => {
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// oh noooo
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})
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```
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Copies files, directories and symlinks. Ownership is maintained when
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running as root, permissions are always maintained. On Windows, if symlinks
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are unavailable then junctions will be used.
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## PUBLIC INTERFACE
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### copy(from, to, [options]) → Promise
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Recursively copies `from` to `to` and resolves its promise when finished.
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If `to` already exists then the promise will be rejected with an `EEXIST`
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error.
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Options are:
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* maxConcurrency – (Default: `1`) The maximum number of concurrent copies to do at once.
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* recurseWith - (Default: `copy.item`) The function to call on each file after recursing into a directory.
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* isWindows - (Default: `process.platform === 'win32'`) If true enables Windows symlink semantics. This requires
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an extra `stat` to determine if the destination of a symlink is a file or directory. If symlinking a directory
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fails then we'll try making a junction instead.
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Options can also include dependency injection:
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* Promise - (Default: `global.Promise`) The promise implementation to use, defaults to Node's.
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* fs - (Default: `require('fs')`) The filesystem module to use. Can be used
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to use `graceful-fs` or to inject a mock.
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* writeStreamAtomic - (Default: `require('fs-write-stream-atomic')`) The
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implementation of `writeStreamAtomic` to use. Used to inject a mock.
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* getuid - (Default: `process.getuid`) A function that returns the current UID. Used to inject a mock.
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## EXTENSION INTERFACE
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Ordinarily you'd only call `copy` above. But it's possible to use it's
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component functions directly. This is useful if, say, you're writing
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[move-concurently](https://npmjs.com/package/move-concurrently).
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### copy.file(from, to, options) → Promise
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Copies an ordinary file `from` to destination `to`. Uses
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`fs-write-stream-atomic` to ensure that the file is either entirely copied
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or not at all.
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Options are:
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* uid, gid - (Optional) If `getuid()` is `0` then this and gid will be used to
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set the user and group of `to`. If uid is present then gid must be too.
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* mode - (Optional) If set then `to` will have its perms set to `mode`.
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* fs - (Default: `require('fs')`) The filesystem module to use. Can be used
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to use `graceful-fs` or to inject a mock.
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* Promise - (Default: `global.Promise`) The promise implementation to use, defaults to Node's.
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* writeStreamAtomic - (Default `require('fs-write-stream-atomic')`) The
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implementation of `writeStreamAtomic` to use. Used to inject a mock.
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### copy.symlink(from, to, options) → Promise
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Copies a symlink `from` to destination `to`. If you're using Windows and
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symlinking fails and what you're linking is a directory then junctions will
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be tried instead.
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Options are:
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* top - The top level the copy is being run from. This is used to determine
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if the symlink destination is within the set of files we're copying or
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outside it.
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* fs - (Default: `require('fs')`) The filesystem module to use. Can be used
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to use `graceful-fs` or to inject a mock.
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* Promise - (Default: `global.Promise`) The promise implementation to use, defaults to Node's.
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* isWindows - (Default: `process.platform === 'win32'`) If true enables Windows symlink semantics. This requires
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an extra `stat` to determine if the destination of a symlink is a file or directory. If symlinking a directory
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fails then we'll try making a junction instead.
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### copy.recurse(from, to, options) → Promise
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Reads all of the files in directory `from` and adds them to the `queue`
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using `recurseWith` (by default `copy.item`).
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Options are:
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* queue - A [`run-queue`](https://npmjs.com/package/run-queue) object to add files found inside `from` to.
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* recurseWith - (Default: `copy.item`) The function to call on each file after recursing into a directory.
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* uid, gid - (Optional) If `getuid()` is `0` then this and gid will be used to
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set the user and group of `to`. If uid is present then gid must be too.
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* mode - (Optional) If set then `to` will have its perms set to `mode`.
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* fs - (Default: `require('fs')`) The filesystem module to use. Can be used
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to use `graceful-fs` or to inject a mock.
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* getuid - (Default: `process.getuid`) A function that returns the current UID. Used to inject a mock.
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### copy.item(from, to, options) → Promise
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Copies some kind of `from` to destination `to`. This looks at the filetype
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and calls `copy.file`, `copy.symlink` or `copy.recurse` as appropriate.
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Symlink copies are queued with a priority such that they happen after all
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file and directory copies as you can't create a junction on windows to a
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file that doesn't exist yet.
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Options are:
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* top - The top level the copy is being run from. This is used to determine
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if the symlink destination is within the set of files we're copying or
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outside it.
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* queue - The [`run-queue`](https://npmjs.com/package/run-queue) object to
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pass to `copy.recurse` if `from` is a directory.
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* recurseWith - (Default: `copy.item`) The function to call on each file after recursing into a directory.
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* uid, gid - (Optional) If `getuid()` is `0` then this and gid will be used to
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set the user and group of `to`. If uid is present then gid must be too.
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* mode - (Optional) If set then `to` will have its perms set to `mode`.
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* fs - (Default: `require('fs')`) The filesystem module to use. Can be used
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to use `graceful-fs` or to inject a mock.
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* getuid - (Default: `process.getuid`) A function that returns the current UID. Used to inject a mock.
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* isWindows - (Default: `process.platform === 'win32'`) If true enables Windows symlink semantics. This requires
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an extra `stat` to determine if the destination of a symlink is a file or directory. If symlinking a directory
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fails then we'll try making a junction instead.
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* Promise - (Default: `global.Promise`) The promise implementation to use, defaults to Node's.
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* writeStreamAtomic - (Default `require('fs-write-stream-atomic')`) The
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implementation of `writeStreamAtomic` to use. Used to inject a mock.
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