archive: add archive function

modules/archive/README.md

@@ -1,11 +1,12 @@
 Archive
 =======
 
-Provides functions to list and extract archives.
+Provides functions to create, list, and extract archives.
 
 Functions
 ---------
 
+  - `archive` creates an archive based on the provided archive name.
   - `lsarchive` lists the contents of one or more archives.
   - `unarchive` extracts the contents of one or more archives.
 
@@ -15,8 +16,8 @@ Supported Formats
 The following archive formats are supported when the required utilities are
 installed:
 
-  - *.tar.gz*, *.tgz* require `tar`.
-  - *.tar.bz2*, *.tbz* require `tar`.
+  - *.tar.gz*, *.tgz* require `tar` (optionally `pigz`).
+  - *.tar.bz2*, *.tbz* require `tar` (optionally `pbzip2`).
   - *.tar.xz*, *.txz* require `tar` with *xz* support.
   - *.tar.zma*, *.tlz* require `tar` with *lzma* support.
   - *.tar* requires `tar`.
@@ -30,11 +31,16 @@ installed:
   - *.7z* requires `7za`.
   - *.deb* requires `ar`, `tar`.
 
+Additionally, if `pigz' and/or `pbzip2` are installed, `archive` will use them over
+their traditional counterparts, `gzip` and `bzip2` respectively, to take full advantage
+of all available CPU cores for compression.
+
 Authors
 -------
 
 *The authors of this module should be contacted via the [issue tracker][1].*
 
   - [Sorin Ionescu](https://github.com/sorin-ionescu)
+  - [Matt Hamilton](https://github.com/Eriner)
 
 [1]: https://github.com/sorin-ionescu/prezto/issues