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https://github.com/kentnl/dist-zilla-plugin-bootstrap-lib

A minimal boot-strapping for Dist::Zilla Plug-ins
https://github.com/kentnl/dist-zilla-plugin-bootstrap-lib

dist-zilla perl

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A minimal boot-strapping for Dist::Zilla Plug-ins

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# NAME



Dist::Zilla::Plugin::Bootstrap::lib - A minimal boot-strapping for Dist::Zilla Plug-ins.



# VERSION



version 1.001002



# SYNOPSIS



    [Bootstrap::lib]

    try_built   = 1  ; try using an existing built distribution named Dist-Name-*

    fallback    = 0  ; if try_built can't find a built distribution, or there's more than one, don't bootstrap

                     ; using lib/ instead



# DESCRIPTION



This module exists for loading either `/lib` or `/Dist-Name-$VERSION/lib` into your `@INC` early on.



This is mostly useful for writing [`Dist::Zilla`](https://metacpan.org/pod/Dist::Zilla) plug-ins, so that you may build and release

a plug-in using itself.



# USE CASES



## Simple single-phase self-dependency



This module really is only useful in the case where you need to use something like



    dzil -Ilib



For _every_ call to [`Dist::Zilla`](https://metacpan.org/pod/Dist::Zilla), and this is mainly a convenience.



For that



    [Bootstrap::lib]



on its own will do the right thing.



## Installed-Only self-dependency



The other useful case is when you would normally do



    dzil build                 # pass 1 that generates Foo-1.234 with a pre-installed Foo-1.233

    dzil -IFoo-1.234/lib build # pass 2 that generates Foo-1.234 with Foo-1.234



For that



    [Bootstap::lib]

    try_built   = 1

    fallback    = 0



Will do what you want.



    dzil build   # pass1 -> creates Foo-1.234 without bootstrapping

    dzil build   # pass2 -> creates Foo-1.234 boot-strapped from the previous build



## 2-step self-dependency



There's a 3rd useful case which is a hybrid of the 2, where you /can/ build from your own sources without needing a

pre-installed version, just you don't want that for release code ( e.g.: $VERSION being `undef` in code that is run during

release is "bad" )



    [Bootstrap::lib]

    try_built = 1

    fallback  = 1



Then



    dzil build  # pass1 -> creates Foo-1.234 from bootstrapped $root/lib

    dzil build  # pass2 -> creates Foo-1.234 from bootstrapped $root/Foo-1.234



# PRECAUTIONS



## DO NOT



**DO NOT** use this library from inside a bundle. It will not likely work as expected, and you **DO NOT** want

to bootstrap everything in all cases.



## NO VERSION



On its own,



    [Bootstrap::lib]



At present, using this module in conjunction with a module with no explicitly defined version in the

source will result in the _executed_ instance of that plug-in _also_ having **NO VERSION**.



If this is a problem for you, then its suggested you try either variation of using



    [Bootstrap::lib]

    try_built = 1

    ; no_fallback = 1   #



## SUCKS AT GUESSING



The core mechanism behind `try_built` relies on looking in your project directory for a previous build directory of some kind.



And there's no way for it to presently pick a "best" version when there are more than one, or magically provide a better

solution if there are "zero" versions readily available.



This is mostly because there is no way to determine the "current" version we are building for, because the point in the

execution cycle is so early, no version plugins are likely to be even instantiated yet, and some version plugins are dependent on

incredibly complex precursors ( like git ), so by even trying to garner the version we're currently building, we could be

prematurely cutting off a vast majority of modules from even being able to bootstrap.



Even as it is, us using `zilla->name` means that if your dist relies on some process to divine its name, the module that

does this must:



- be loaded and declared prior to `Bootstrap::lib` in the `dist.ini`

- not itself be the module you are presently developing/bootstrapping



The only way of working around that I can envision is adding parameters to `Bootstrap::lib` to specify the dist name and version

name... but if you're going to do that, you may as well stop using external plugins to discover that, and hard-code those values

in `dist.ini` to start with.



## STILL NOT REALLY A PLUGIN



Starting at version 0.04000000 ( read: 0.04\_0000\_00 aka 0.04 + 0 x 4 + 0 x 2 ) this module is a fully fledged class, different

only from standard Dist::Zilla Plugins in that it doesn't partake in normal phase order, and only executes during a special

custom `::Bootstrap` phase, which is more or less a different name and implementation of `BUILD`, in that `bootstrap` is

invoked after `plugin_from_config` is called ( where `new` is called ), which occurs somewhere in the middle of

`register_component`



This module also appears on the plugin stash, and responds naturally to `metaconfig` requests.



# AUTHOR



Kent Fredric 



# COPYRIGHT AND LICENSE



This software is copyright (c) 2017 by Kent Fredric .



This is free software; you can redistribute it and/or modify it under

the same terms as the Perl 5 programming language system itself.