Fediversity/website/structure/default.nix

248 lines
7.6 KiB
Nix

{ config, options, lib, pkgs, ... }:
let
inherit (lib)
mkOption
types
;
cfg = config;
types' = {
article = { config, collectionName, ... }: {
imports = [ types'.page ];
options = {
date = mkOption {
description = "Publication date";
type = with types; nullOr str;
default = null;
};
author = mkOption {
description = "Page author";
type = with types; nullOr (either str (listOf str));
default = null;
};
};
config.name = lib.slug config.title;
config.outPath = "${collectionName}/${lib.head config.locations}";
config.template = cfg.templates.article;
};
page = { name, config, ... }: {
options = {
name = mkOption {
description = "Symbolic name for the page, used as a human-readable identifier";
type = types.str;
default = name;
};
title = mkOption {
description = "Page title";
type = types.str;
default = name;
};
locations = mkOption {
description = ''
List of historic output locations for the resulting file
The first element is the canonical location.
All other elements are used to create redirects to the canonical location.
'';
type = with types; nonEmptyListOf str;
};
link = mkOption {
description = "Helper function for transparent linking to other pages";
type = with types; functionTo str;
default = target: "TODO: compute the relative path based on `locations`";
};
outPath = mkOption {
description = ''
Location of the page, used for transparently creating links
'';
type = types.str;
default = lib.head config.locations;
};
description = mkOption {
description = ''
One-sentence description of page contents
'';
type = types.str;
};
summary = mkOption {
description = ''
One-paragraph summary of page contents
'';
type = types.str;
};
body = mkOption {
description = ''
Page contents in CommonMark
'';
type = types.str;
};
template = mkOption
{
description = ''
Function that converts the page contents to files
'';
type = with types; functionTo (functionTo options.files.type);
default = cfg.templates.page;
};
};
};
};
in
{
# TODO: split out:
# - extra module system types into lib'
# - page and article types into their own module values under structure/${page,article}.nix
# yes, actually. those types should probably be configurable
config.collections.news.type = types'.article;
options.pages = mkOption {
description = ''
Collection of pages on the site
'';
type = with types; attrsOf (submodule types'.page);
};
options.collections = mkOption
{
description = ''
Named collections of unnamed pages
'';
type = with types; attrsOf (submodule ({ name, config, ... }: {
options = {
type = mkOption {
description = "Type of entries in the collection";
type = types.deferredModule;
};
entry = mkOption {
description = "An entry in the collection";
type = types.collection (types.submodule ({
_module.args.collection = config.entry;
_module.args.collectionName = name;
imports = [ config.type ];
}));
};
};
}));
};
options.templates = mkOption {
description = ''
Collection of named functions to convert page contents to files
Each template function takes the complete site `config` and the page data structure.
'';
type = with types; attrsOf (functionTo (functionTo options.files.type));
};
# TODO: split out templates and all related helper junk into `../presentation`
config.templates =
let
commonmark = name: markdown: pkgs.runCommand "${name}.html"
{
buildInputs = [ pkgs.cmark ];
} ''
cmark ${builtins.toFile "${name}.md" markdown} > $out
'';
in
{
page = lib.mkDefault (config: page: {
# TODO: create static redirects from `tail page.locations`
# TODO: reconsider using `page.outPath` and what to put into `locations`.
# maybe we can avoid having ".html" suffixes there.
# since templates can output multiple files, `html` is merely one of many things we *could* produce.
${page.outPath} = builtins.toFile "${page.name}.html" ''
<html>
<head>
<meta charset="utf-8" />
<meta http-equiv="X-UA-Compatible" content="IE=edge" />
<meta name="viewport" content="width=device-width, initial-scale=1" />
<title>${page.title}</title>
<meta name="description" content="${page.description}" />
<link rel="canonical" href="${page.outPath}" />
</head>
<body>
${lib.indent " " (builtins.readFile (commonmark page.name page.body))}
<body>
</html>
'';
});
article = lib.mkDefault (config: page: {
# TODO: create static redirects from `tail page.locations`
${page.outPath} = builtins.toFile "${page.name}.html" ''
<html>
<head>
<meta charset="utf-8" />
<meta http-equiv="X-UA-Compatible" content="IE=edge" />
<meta name="viewport" content="width=device-width, initial-scale=1" />
<title>${page.title}</title>
<meta name="description" content="${page.description}" />
${with lib;
if ! isNull page.author then
''<meta name="author" content="${if isList page.author then join ", " page.author else page.author}" />''
else ""
}
<link rel="canonical" href="${page.outPath}" />
</head>
<body>
${lib.indent " " (builtins.readFile (commonmark page.name page.body))}
<body>
</html>
'';
});
};
options.files = mkOption {
description = ''
Files that make up the site, mapping from output path to contents
By default, all elements in `option`{pages} are converted to files using their template or the default template.
Add more files to the output by assigning to this attribute set.
'';
type = with types; attrsOf path;
};
config.files =
let
pages = lib.concatMapAttrs
(name: page: page.template config page)
config.pages;
collections =
let
byCollection = with lib; mapAttrs
(_: collection:
map (entry: entry.template config entry) collection.entry
)
config.collections;
in
with lib; concatMapAttrs
(collection: entries:
foldl' (acc: entry: acc // entry) { } entries
)
byCollection;
in
pages // collections;
options.build = mkOption {
description = ''
The final output of the web site
'';
type = types.package;
default =
let
script = ''
mkdir $out
'' + lib.join "\n" copy;
copy = lib.mapAttrsToList
(
path: file: ''
mkdir -p $out/$(dirname ${path})
cp -r ${file} $out/${path}
''
)
config.files;
in
pkgs.runCommand "source" { } script;
};
}