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+.TH GENPKG 1 2012-5-31
+.SH NAME
+genpkg \- ArchLinux package meta generator
+.SH SYNOPSIS
+.B genpkg
+[
+.B names of packages to generate
+]
+.SH DESCRIPTION
+.PP
+If PKGBUILDs are binary package generators, then \fBgenpkg\fR is a package
+generator generator. \fBgenpkg\fR creates PKGBUILDs and supporting files that
+can be used to create source packages or build binary packages. The purpose
+of \fBgenpkg\fR is to more easily automate the creation of packages. The
+primary goal is to map packages from other sources of software releases.
+.PP
+Software releases include perl's CPAN distributions, python's
+PyPI eggs, or ruby's gems. In order to meet my current needs,
+\fBgenpkg\fR currently supports perl CPAN distributions. The design
+should make it easy to add support for any other such sources. \fBgenpkg\fR
+is merely the front to several other scripts which are responsible for the
+different stages of package generation.
+.SH FILES
+.PP
+The following directories are used by genpkg, by default. Right now it
+is only possible to change them by editing genpkg. They are at the top of
+the script.
+.IP \fB$HOME/pkg/dest/\fR
+Generated packages are stored here
+.IP \fB$HOME/pkg/mods/\fR
+Modifications are searched for in this directory.
+.IP \fB$HOME/.genpkg/preps/\fR
+Preparation scripts are searched for here. Each script may have a
+supporting directory as well.
+.IP \fB$HOME/.genpkg/var/\fR
+Data that needs to be saved between invocations by preparation
+scripts is stored here. These are usually indices of releases.
+.SH IMPLEMENTATION NOTES
+.SS Preparation
+.PP
+The first stage is preparation performed by the \fIprepkg(1)\fR script.
+Software releases (i.e. tarballs) must be fetched and general information
+about the package is determined from these downloaded files. Scripts
+called \fI"preps"\fR are each queried in turn to see if the specified package
+is one they recognize. Each package source has its own prep script, though
+currently only one exists for the CPAN. The prep creates a PKGDATA file,
+a simple key/value text file, and initializes the PKGBUILD functions by using
+\fIputpkgtree(1)\fR. \fBprepkg\fR's duty is then finished.
+.SS Modification
+.PP
+While creating perl packages I found that automated techniques
+could not always generate exactly what I wanted. Human intervention would
+sometimes be inevitable. In case modification is necessary, a \fImod\fR script
+can be created. Mods are written in tcl and usually stored in
+\fI$HOME/pkg/mods/\fR. If a mod script with the same name as the package
+is present, the modifications are performed on the PKGDATA and PKGBUILD.
+These duties are handled by \fImodpkg(1)\fR.
+.SS Finalization
+.PP
+Now the package data and functions are merged together into a PKGBUILD.
+\fIinjectdigs(1)\fR is used to generate the MD5 and SHA digests for the
+package files in the source array, as well as any patches or files added.
+\fIvervar(1)\fR is used to replace version strings in PKGBUILD fields with
+\fB$pkgver\fR. After the \fIPKGDATA(5)\fR stream is fed through these
+filters, the \fIpbfields(1)\fR script converts the fields into a PKGBUILD header.
+All of the sections of the PKGBUILD are then merged together and written
+to a file with the help of the \fIgetpkgtree(1)\fR script.
+.SH SEE ALSO
+.PP
+.BR prepkg(1) ,
+.BR modpkg(1) ,
+.BR pbfields(1) ,
+.BR injectdigs(1) ,
+.BR vervar(1) ,
+.BR putpkgtree(1) ,
+.BR getpkgtree(1) ,
+.BR PKGDATA(5)
+.SH AUTHOR
+.PP
+Justin "juster" Davis <jrcd83@gmail.com>