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#lang scribble/manual
@require[@for-label[polyglot file-watchers unlike-assets unlike-assets/logging]]

@title{@tt{polyglot} CLI}

To simplify use, Polyglot comes with a @tt{polyglot} CLI that acts as a
front-end to the @racketmodname[polyglot] collection. You can also use @tt{raco
polyglot} for backwards compatibility.

The @tt{build}, @tt{demo} and @tt{develop} commands forward events
from @racket[unlike-assets-logger] to STDOUT. The @tt{build} and
@tt{demo} commands report the number of warnings and errors
encountered during processing.

@section{@tt{polyglot start}: Start a Project}

@verbatim[#:indent 2]|{
$ polyglot start -f my-functional-website
$ polyglot start my-imperative-website
}|

The @tt{start} command creates a project directory with the given name
in the working directory. By default, the project will use
@racket[polyglot/imperative%] and include some supported starter
code. If you specify @litchar{-f} or @litchar{--functional}, the
project will reflect use of @racket[polyglot/functional%] instead.

@section{@tt{polyglot build}: Build a Project Once}

The @tt{build} command accepts a path as an argument and attempts to
build a project using a workflow. If a workflow cannot be determined,
the @tt{build} command will try to use @racket[polyglot/imperative%]
for backwards-compatibility reasons. If the path is a relative path,
it will be converted to a complete path relative to the current
working directory.

The behavior will vary slightly if you specify a directory or a file.

@subsection{Specifying a Directory}

@verbatim[#:indent 2]|{
$ polyglot build my-website
}|

When you specify a directory, the @tt{build} command will try to
require @racket[polyglot+%] from @tt{my-website/.polyglotrc.rkt},
falling back to @racket[polyglot/imperative%] on failure. It will then
instantiate the selected workflow class, and start processing
from @tt{my-website/assets/index.md}.

@subsection{Specifying an Asset File}

@verbatim[#:indent 2]|{
$ polyglot build my-website/assets/styles/styles.css
}|

When you specify a file, the @tt{build} command will require
@racket[polyglot+%] from the @tt{.polyglotrc.rkt} in the nearest
project directory, falling back to @racket[polyglot/imperative%] on
failure. It will then instantiate the selected workflow class, and
start processing from the asset specified in the command line.

@section{@tt{polyglot develop}: Build a Project Live}
The @tt{develop} command builds a project once, then rebuilds your
website in response to changes in assets detected using
@racket[robust-watch]. It will stop when you press Control-C.

@verbatim[#:indent 2]|{
$ polyglot develop my-website
}|

The @tt{develop} command will also start a local development server
unless @tt{-n} or @tt{-}@tt{-no-server} is specified. You can also
set a port using @tt{-p}/@tt{-}@tt{-port}, or use the default of
@racket[8080].

@verbatim[#:indent 2]|{
$ polyglot develop -p 6790 my-website
$ polyglot develop -n my-website # Server won't start
}|

The process that monitors and rebuilds assets operates independently of the
server. If you do not start the development server, the @tt{develop} command
will still rebuild assets in response to changes.

The rules for how the @tt{develop} command treats paths are the same
as the @tt{build} command.

You can specify a delay, in milliseconds, that must elapse after the last
detected change in assets before the command tries rebuilding your site. By
default, this is 500 milliseconds. You can use this to aggregate changes and
avoid triggering too many builds when saving changes rapidly in your project.

@verbatim[#:indent 2]|{
$ polyglot develop --delay 1000 my-website
}|

@section{@tt{polyglot demo}: Build Demo Project}

@verbatim[#:indent 2]|{
$ polyglot demo
}|

The @tt{demo} command is a special case of @tt{build} that targets the README
from Polyglot's own source code. The distribution directory will appear in
the working directory. This command is meant to verify that a Polyglot
installation is supported on the target platform and is working as intended.

@section{@tt{polyglot publish}: Publish to S3}

The @tt{publish} command builds a project once, then writes the
contents of a project's @tech{distribution directory} to an AWS S3
bucket. The rules for how the @tt{publish} command treats paths are
the same as the @tt{build} command.

@verbatim[#:indent 2]|{
$ polyglot publish my-website my-bucket
}|

Before you use this command, @bold{read this entire section.} If you
do not agree with ANY of it, then use the AWS CLI or the
@racketmodname[aws/s3] library to publish your website.

Use the @litchar{-d} or @litchar{--dry-run} switch to
avoid writing content to S3 and instead merely report
what the command would otherwise do to the bucket.

@verbatim[#:indent 2]|{
$ polyglot publish -d my-website my-bucket
}|

Use the @litchar{-r} or @litchar{--region} switch to
change the applicable S3 region.

@verbatim[#:indent 2]|{
$ polyglot publish -r us-east-2 my-website my-bucket
}|

Use the @litchar{--delete-diff} switch to delete all objects in the S3
bucket that are not part of the distribution uploaded to the
bucket. Most people won't need this.

@verbatim[#:indent 2]|{
$ polyglot publish --delete-diff my-website my-bucket
}|

@subsection{Assumptions}
@itemlist[
@item{The bucket is configured for static web hosting.}
@item{HTML files should never be cached.}
@item{All other files should be cached forever.}
]

@subsection{Process}
@itemlist[#:style 'ordered
@item{Authenticate against AWS with @racket[read-keys/aws-cli].}
@item{Read all keys in the bucket and compare them to the local contents of the dist directory. Remember the elements that are remote but not local.}
@item{Uploads the contents of the dist directory to the root of the bucket, overwriting any objects that already exist.}
@item{If @racket[--delete-diff] is set on the command, delete from the bucket the objects marked in Step 2.}]

@bold{If you want to ensure no broken links, then do not ever use
@racket[--delete-diff]}. You'll only want to use that option if the
space savings and hygiene are actually worth it, and if
@italic{everything} in the bucket that you need for your website is
produced by a Polyglot build.

@section{Shared Command Options}

Some command-line flags may be specified after @tt{polyglot} but
before a subcommand.

Use the @litchar{-v} or @litchar{--verbose} option to include debug
level events from @racket[unlike-assets-logger] in STDOUT.

@verbatim[#:indent 2]|{
$ polyglot -v build some-site
}|

Use the @litchar{-b} or @litchar{--by-module} option with a path
to a Racket module to forcibly use that module in place of a project's
@tt{.polyglotrc.rkt}.

@verbatim[#:indent 2]|{
$ polyglot -b /etc/polyglot.d/shared-config.rkt build some-site
}|
