You cannot select more than 25 topics Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
pollen/scribblings/world.scrbl

122 lines
6.6 KiB
Racket

#lang scribble/manual
@(require "mb-tools.rkt")
@(require scribble/eval pollen/cache pollen/world (for-label racket (except-in pollen #%module-begin) pollen/world pollen/render))
@(define my-eval (make-base-eval))
@(my-eval `(require pollen pollen/world))
@title{World}
@defmodule[pollen/world]
Global values that are used throughout the Pollen system.
@section{Parameters}
I mean @italic{parameters} in the Racket sense, i.e. values that can be fed to @racket[parameterize].
@defparam[world:current-server-port port integer?]{
A parameter that sets the HTTP port for the project server. Initialized to @racket[world:default-port].}
@defparam[world:current-project-root port path?]{
A parameter that holds the root directory of the current project (e.g., the directory where you launched @code{raco pollen start}).}
@defparam[world:current-server-extras-path dir path?]{
A parameter that reports the path to the directory of support files for the project server. Initialized to @racket[#f], but set to a proper value when the server runs.}
@defparam[world:check-directory-requires-in-render? check? boolean?]{
A parameter that determines whether the @racket[world:directory-require] file is checked for changes on every pass through @racket[render]. (Can be faster to turn this off if you don't need it.) Initialized to @racket[#t].}
@section{Values that can be overwritten with @racket[local:]}
These values can be changed by overriding them in your @racket["directory-require.rkt"] source file. Use @racket[define] to make a variable with the same name as the one in @racket[pollen/world], but with the prefix @racket[local:] instead of @racket[world:]. Assign it whatever value you like. When Pollen runs, these definitions will supersede those in @racket[pollen/world].
For instance, suppose you wanted the main export of every Pollen source file to be called @racket[van-halen] rather than @racket[doc], the extension of Pollen markup files to be @racket[rock] rather than @racket[pm], and the command character to be @litchar{🎸} instead of @litchar{}. Your @racket["directory-require.rkt"] would include these defintions:
@fileblock["directory-require.rkt"
@codeblock{
#lang racket/base
(provide (all-defined-out))
(define local:main-export 'van-halen)
(define local:markup-source-ext 'rock)
(define local:command-char #\🎸)
}]
Though any of the values below can be overridden, it may not always be wise to do so. For instance, if you redefined @racket[world:fallback-template-prefix], you would simply break the fallback-template mechanism, because it would look for files that don't exist. But we don't live in a nanny state, so you are entrusted to say what you mean and accept the consequences.
Of course, you can restore the defaults simply by deleting these defined values from @racket["directory-require.rkt"].
These overridable values also come with a corresponding @racket[get-] function that will return the @racket[local:] value if it exists, otherwise the @racket[world:] value. In the example above, @racket[world:command-char] would be @litchar{} no matter what, but @racket[world:get-command-char] would return @litchar{🎸}.
@defoverridable[default-port integer?]{
Determines the default HTTP port for the project server. Initialized to @racket[8080].}
@defoverridable[main-export symbol?]{The main X-expression exported from a compiled Pollen source file. Initialized to @racket[doc].}
@defoverridable[meta-export symbol?]{The meta hashtable exported from a compiled Pollen source file. Initialized to @racket[metas].}
@defoverridable[world:meta-tag-name symbol?]{Name of the tag used to mark metas within Pollen source.}
@defoverridable[world:directory-require string?]{File implicitly required into every Pollen source file from its directory. Initialized to @filepath{directory-require.rkt}.}
@defoverridable[world:server-extras-dir string?]{Name of directory where server support files live. Initialized to @tt{server-extras}.}
@deftogether[(
@defoverridable[preproc-source-ext symbol?]
@defoverridable[markup-source-ext symbol?]
@defoverridable[markdown-source-ext symbol?]
@defoverridable[null-source-ext symbol?]
@defoverridable[pagetree-source-ext symbol?]
@defoverridable[template-source-ext symbol?]
@defoverridable[scribble-source-ext symbol?]
)]
File extensions for Pollen source files, initialized to the following values:
@racket[world:preproc-source-ext] = @code[(format "'~a" world:preproc-source-ext)]
@(linebreak)@racket[world:markup-source-ext] = @code[(format "'~a" world:markup-source-ext)]
@(linebreak)@racket[world:markdown-source-ext] = @code[(format "'~a" world:markdown-source-ext)]
@(linebreak)@racket[world:null-source-ext] = @code[(format "'~a" world:null-source-ext)]
@(linebreak)@racket[world:pagetree-source-ext] = @code[(format "'~a" world:pagetree-source-ext)]
@(linebreak)@racket[world:template-source-ext] = @code[(format "'~a" world:template-source-ext)]
@(linebreak)@racket[world:scribble-source-ext] = @code[(format "'~a" world:scribble-source-ext)]
@defoverridable[decodable-extensions (listof symbol?)]{File extensions that are eligible for decoding.}
@defoverridable[default-pagetree string?]{Pagetree that Pollen dashboard loads by default in each directory. Initialized to @filepath{index.ptree}.}
@defoverridable[pagetree-root-node symbol?]{Name of the root node in a decoded pagetree. It's ignored by the code, so its only role is to clue you in that you're looking at something that came out of the pagetree decoder. Initialized to @code{'pagetree-root}.}
@defoverridable[command-char char?]{The magic character that indicates a Pollen command, function, or variable. Initialized to @racket[#\◊].}
@defoverridable[default-template-prefix string?]{Prefix of the default template. Initialized to @code{"template"}.}
@defoverridable[fallback-template-prefix string?]{Used to generate the name of the fallback template (i.e., the template used to render a Pollen markup file when no other template can be found). Prefix is combined with the output suffix of the source file. Initialized to @code{"fallback"}.}
@defoverridable[template-meta-key symbol?]{Meta key used to store a template name for that particular source file. Initialized to @racket['template].}
@deftogether[(
@(defoverridable world:newline string?)
@(defoverridable world:linebreak-separator string?)
@(defoverridable world:paragraph-separator string?)
)]
Default separators used in decoding. The first two are initialized to @racket["\n"]; the third to @racket["\n\n"].
@defoverridable[dashboard-css string?]{CSS file used for the dashboard. Initialized to @filepath{poldash.css}.}
@defoverridable[paths-excluded-from-dashboard (listof path?)]{Paths not shown in the Pollen dashboard.}