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A static website compiler
Although there is a native Markdown parser for Chicken these days (called Lowdown) due to historical reasons you'll have to have a markdown program available in your PATH to use Markdown in your Hyde pages for the time being. Alternatively you can define a custom page translator using Lowdown (see translators).
Hyde is a program for compiling static websites from a variety of input files. It is basically a Schemey clone of programs such as Webby and, particularly name-wise, Jekyll. Note that there is another project named Hyde which is similar in purpose but written in Python.
Hyde can be run through the hyde executable contained in this egg.
A website is, in Hyde's sense, a directory containing at least a hyde.scm file. This file is evaluated before any command and can be used to set parameters or define helper functions. It should also contain a directory of source files (unless the (source-dir) parameter points somewhere outside the current directory). Invoking the compilation process will recursively traverse (source-dir) and do one of the following things for each file it finds:
- If the file's extension is unknown to Hyde, copy the file to the same relative path within (output-dir) unchanged.
- If the file's extension is known to Hyde, translate its contents, possibly wrap the result in one or more layouts and write it to the same relative path within (output-dir), possibly changing its extension.
In the latter case, the translator used is determined by the source file's extension (see translators for a list of available translators). Before translation, the file is (read), i.e. the first s-expression in the file is read from it. This s-expression must be an alist (or a null list) holding arbitrary page-vars which are made available within the page's as well as the layouts' evaluation environment. This can be used to set a page title, for example. The rest of the file is considered the page's body and is left to be translated by the translator.
Applying css to a website is done by using scss or regular css. Documentation for the syntax used in scss can be found in scss.
Hyde's functionality is probably best understood by an example session. Let's start by initializing a site:
$ mkdir cool-site $ cd cool-site $ hyde init creating layouts creating src creating out creating hyde.scm creating layouts/default.sxml
We now have a basic site structure. The next step would probably be to add some pages, so let's start by creating an index page in wiki (i.e. svnwiki) format:
$ hyde new wiki index src/index.wiki $ cat src/index.wiki ((title . "index"))
As you can see, Hyde created the source file and inserted the file name as a page-var called title, too (actually it's the other way around: the argument for hyde new is the title and Hyde transforms this into a suitable file name, i.e. it removes special chars and substitutes spaces with dashes). This is handy as the default layout uses this to fill the <title> tag in the resulting HTML document:
$ cat layouts/default.sxml () `((xhtml-1.0-strict) (html (head (title ,($ 'title))) (body (h1 ,($ 'title)) (inject ,contents))))
As we learn from that example, page-vars can be referred to through the $ function which is made available by Hyde in the environment which SXML (as well as SCSS and Atom) pages are evaluated in. Also note the inject transformation rule which allows injection of unescaped HTML into the document. Finally, the variable contents contains the translated page contents (see Available Bindings During Page Evaluation).
Let's add a little content to our page and compile the site:
$ echo 'Hey, welcome to my cool site!' >> src/index.wiki $ hyde cleaning output directory preparing compilation compiling pages * index.wiki -> index.html
$ cat out/index.html <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"> <html> <head> <title>index</title></head> <body> <h1>index</h1> <p>Hey, welcome to my cool site!</p> </body></html>
As you can see, Hyde renamed index.wiki to index.html. This can be changed through the default-extension parameter or by adding a page-var ext to the page:
$ cat src/index.wiki ((title . "index") (ext . "xml")) Hey, welcome to my cool site!
$ hyde cleaning output directory preparing compilation compiling pages * index.wiki -> index.xml
The hyde executable understands the following options:
- -e HYDE_ENV_NAME
- Sets the hyde environment to execute the command in (see Available Commands for which commands respect this option and define-hyde-environment on how to define environments).
The hyde executable understands the following commands:
- hyde init
- Initializes a site in the current directory.
- hyde new <page-type> [<title> ...]
- Creates a new page with the given page type and title. The page's filename will be inferred from the given title by downcasing it and replacing spaces with dashes.
- hyde serve
- Serves the current site with spiffy, (re-)compiling the requested page on each request (useful for development). This command respects the -e option.
- hyde build [<prefix> ...]
- Builds the current site. If prefixes are given then only paths having those prefixes will be built. This command respects the -e option.
- Compiles the current site. This command respects the -e option.
The following parameters are available to configure Hyde's behavior. They are usually set in a site's hyde.scm.
- source-dir #!optional dirparameter
The directory in which source pages are kept. Default: "src"
- layouts-dir #!optional dirparameter
The directory in which layouts are kept. Default: "layouts"
- output-dir #!optional dirparameter
The directory compilation results will be written to. Default: "out"
- default-layouts #!optional layoutsparameter
A list of default layouts which are applied when no other is specified. Default: '("default.sxml")
- clean-before-build #!optional boolparameter
Indicates whether to purge the output-dir before compilation or not. Default: #t
- excluded-paths #!optional regexesparameter
A list of regular expressions matching paths which are to be ignored when compiling. Default: `(,(irregex (seq "~" eos)))
- default-extension #!optional extensionparameter
The file extension to use for compiled pages which don't explicitly specify an extension. Default: "html"
- default-page-vars #!optional page-varsparameter
An alist which maps either (ir)regexps or procedures to page-vars. Each page has its page-source-path matched against the (ir)regexps or is passed to the procedure. If it matches or returns non-#f, the respective page-vars are appended to the page's local page-vars, i.e. local page-vars have precedence over them. Default: '()
The following default-page-vars would set the layouts page-var to ("page.sxml" "default.sxml") for all .sxml pages with the relative path prefix pages/ and the page-vars tags to (awful) for all pages containing the word "cool":
(default-page-vars `(((seq bos "pages/" (+ any) ".sxml" eos) (layouts "page.sxml" "default.sxml")) (,(lambda (page) (irregex-search "cool" (read-page page))) (tags awful))))
- page-eval-env #!optional envparameter
The environment for evaluating SXML and SCSS pages. It needs to be an environment created via the hyde-page-eval-env module which is a (mostly) drop-in replacement for the deprecated environments egg. Note that the top-level environment is always used as a fallback for lookup.
- uri-path-prefix #!optional pathparameter
A string that is prepended to all pages' page-path. Default: "".
An alist of shortcut names (symbols) mapping to URI templates containing format placeholders. These shortcuts can be used with the following page translators:
- The [[link]] syntax is extended to allow shortcuts to be used by prefixing the path with the shortcut name and a colon, for example: [[foo:something]] will use the foo shortcut and substitute the first placeholder with "something".
- The transformation rule shortcut can be used to expand a shortcut name into a URI, for example: (a (@ (href (shortcut foo "something")))).
This feature has been added in version 0.12.
- ignore-page? #!optional predicateparameter
predicate is a procedure accepting a page; when it returns #t that page will not be compiled to an output file (it can still be accessed through pages though).
This parameter has been added in version 0.16.
- ignore-page? #!optional predicateparameter
An alist of all available pages indexed by their source file names relative to (source-dir). The values are page records. Note that it is only bound during site compilation, i.e. not yet when hyde.scm is loaded.
This used to be a constant up until version 0.13 and was only available in the page-eval-env up until 0.20.0.
- page-by-path pathprocedure
Looks up a page by its target path (i.e. page-path), which can be given as a string or a list of strings representing the path components.
Returns the current page's record. Only bound during compilation.
- page-path pageprocedure
Returns the given page's absolute URI path.
- page-source-path pageprocedure
Returns the given page's source path relative to (source-dir).
- page-vars pageprocedure
Returns the given page's page-vars as an alist.
- page-type pageprocedure
Returns the given page's type which is one of the following symbols:
- a page which is handled by one of Hyde's page translators
- a page which is just copied to (output-dir)
- a directory
- read-page page #!rest layoutsprocedure
Returns the given page's contents, possibly wrapped in the given layouts. page may be either a page record or a path relative to (source-dir). This procedure is useful to create aggregate pages. Note that it will translate the contents of dynamic pages even if they have not been compiled, yet. In this case, they will neither be wrapped in page-specific nor the default layouts, only the ones given in layouts.
A translator is a zero-argument procedure which is expected to read the contents of a Hyde page from (current-input-port) and write its translation to (current-output-port). For example, the SXML translator shipped with Hyde reads s-expressions from (current-input-port), evaluates them in (page-eval-env), applies sxml-conversion-rules and finally writes the result rendered as HTML to (current-output-port). Note The page-vars preamble has already been read and interpreted at the point a translator is called. The page being translated is available via (current-page).
Translators for SXML, SCSS, Markdown and svnwiki formatted pages. See translators parameter for which files extensions they are mapped to.
- translators #!optional translators-alistparameter
An alist of source language translators indexed by file extensions. Default:
`(("sxml" ,translate-sxml) ("scss" ,translate-scss (ext . css) (layouts)) ("md" ,translate-markdown) ("wiki" ,translate-svnwiki) ("sw" ,translate-svnwiki))
Additionally, `("atom" ,translate-atom (ext . atom) (layouts)) can be made available by loading the hyde-atom extension from your site's hyde.scm.
(use lowdown) (translators (cons (list "md" markdown->html) (translators)))
- make-external-translator program-name #!optional argsprocedure
Creates a procedure that reads from (current-input-port) and writes to the standard input of the external program program-name (either a string or a thunk returning a string). Optionally a thunk can be passed for args which needs to return a list of arguments for the program. The program's standard output is read back and written to (current-output-port). It can be used to create page translators for external programs, e.g. the markdown translator included in Hyde is defined like this:
(define translate-markdown (make-external-translator markdown-program)) (translators (cons (list "md" translate-markdown) (translators)))
These procedures and macros are mainly intended for use in the hyde.scm or in extension modules.
- (define-hyde-environment name body ...)syntax
Defines an environment name. The body expressions are only evaluated when hyde is executed with -e [name]. This is useful to set different parameters for different scenarios or deployment locations. If no -e option is set, the default environment is used. Just (define-hyde-environment default ...) to override it. See Available Commands for which commands respect environments.
- pathify stringprocedure
Turn string into a URL friendly path name.
(pathify "This is \"something\" nice.") ; => "this-is-something-nice"
Exported since version 0.16.
The set of SXML conversion rules used for translating sxml pages.
Exported since version 0.15.
- serve-page page path continueprocedure
Default handler for the hyde serve command which translates dynamic pages when requested by their target path and tries to serve index files for directories as defined via Spiffy's index-files parameter. Static files are handled by Spiffy's default handler.
See also page-serve-handler.
In pages which are evaluated as Scheme (currently SXML, SCSS and Atom pages), the following bindings are available:
- $ page-var #!optional pageprocedure
Returns the value of page-var (a symbol identifiying the page-var) or #f if no page-var of that name exists. By giving the optional page argument, refer to that page's page-vars instead of the current page's.
The translated contents of the current page. Only available in layouts.
A procedure that is called for every page translation. It needs to accept the following arguments:
- The page being translated
- A thunk which returns the translation result
The procedure needs to return the translation result. Default:
(lambda (page translate) (translate))
Available since version 0.21.0.
A procedure that is called for every request handled by hyde serve. It needs to accept the following arguments:
- The requested page or #f if none was found for the requested path
- The requested path represented as a list of strings
- A thunk to be called in case no response was sent
Available since version 0.21.0.
- Fix external translator support for CHICKEN 5 (thanks Vasilij Schneidermann for the patch)
- First version to support CHICKEN 5
- Add around-page-translate and page-serve-handler hooks.
- Export all page accessors and translators.
- As a result of this, remove many bindings from the default page-eval-env (most notably pages).
- Make make-external-translator use copy-port instead of line-wise reading/writing and turn it into a procedure.
- Also handle dotfiles (e.g. for .htaccess files, thanks Peter Bex for the suggestion).
- Replace deprecated environments egg with mostly drop-in hyde-page-eval-env module.
- Add hyde build command.
- Allow link-shortcuts to be procedures.
- Extract pathify.
- Use big-chicken module environment when possible.
- Fix issue in hyde serve with trailing slashes on paths (thanks John J Foerch for the patch).
- Add ignore-page?. Fix escaping issue in colorize-code (thanks Peter Bex for the patch).
- Add a link with relation alternate to the atom feed emitted by hyde-atom.
- Add hyde-atom module for convenient generation of atom feeds from pages.
- Export sxml-conversion-rules
- Some compatibility changes. Depend on Spiffy >= 4.9.
- Add link-shortcuts.
- Change default-page-vars irregex keys to match against page-source-path instead of page-path.
- Add environments.
- Add uri-path-prefix.
- Add colorize support to svnwiki pages.
- Implement more powerful default-page-vars.
- Add make-external-translator (thanks to Christian Kellermann for the patch).
- Only recompile requested pages instead of the whole site with hyde serve.
- Print usage for unknown commands (thanks to Christian Kellermann).
- Add current-page binding and make it the default argument for all page record field accessors.
- Add svnwiki and atom page translators.
- Make pages a proper type.
- Allow creation of aggregate pages through read-page.
- Drop sxml-shortcuts from sxml-conversion-rules.
- document layout nesting
- change default extension to be an alist mapping source extensions to target extensions
Copyright (c) 2010-2019, Moritz Heidkamp All rights reserved. Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met: Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer. Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution. Neither the name of the author nor the names of its contributors may be used to endorse or promote products derived from this software without specific prior written permission. THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.