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pollen/template.rkt

89 lines
3.3 KiB
Racket

#lang racket/base
(require (for-syntax racket/base))
(require racket/string xml xml/path sugar/define sugar/container sugar/coerce/contract)
(require "tools.rkt" txexpr "world.rkt" "cache.rkt" "pagetree.rkt")
(require sugar/coerce/value)
(provide (all-from-out sugar/coerce/value))
(define/contract+provide (metas->here metas)
(hash? . -> . pagenode?)
(path->pagenode (select-from-metas 'here-path metas)))
(define (pagenode->path pagenode)
(build-path (world:current-project-root) (symbol->string pagenode)))
(define+provide/contract (select key value-source)
(coerce/symbol? (or/c hash? txexpr? pagenode? pathish?) . -> . (or/c #f txexpr-element?))
(define metas-result (and (not (txexpr? value-source)) (select-from-metas key value-source)))
(or metas-result
(let ([doc-result (select-from-doc key value-source)])
(and doc-result (car doc-result)))))
(define+provide/contract (select* key value-source)
(coerce/symbol? (or/c hash? txexpr?) . -> . (or/c #f (listof txexpr-element?)))
(define metas-result (and (not (txexpr? value-source)) (select-from-metas key value-source)))
(define doc-result (select-from-doc key value-source))
(define result (append (or (and metas-result (list metas-result)) null) (or doc-result null)))
(and (not (null? result)) result))
(define+provide/contract (select-from-metas key metas-source)
(coerce/symbol? (or/c hash? pagenode? pathish?) . -> . (or/c #f txexpr-element?))
(define metas (cond
[(hash? metas-source) metas-source]
[else (get-metas metas-source)]))
(and (hash-has-key? metas key) (hash-ref metas key)))
(define+provide/contract (select-from-doc key doc-source)
(coerce/symbol? (or/c txexpr? pagenode? pathish?) . -> . (or/c #f (listof txexpr-element?)))
(define doc (cond
[(txexpr? doc-source) doc-source]
[else (get-doc doc-source)]))
(define result (se-path*/list (list key) doc))
(and (not (null? result)) result))
(define (get-metas pagenode-or-path)
; ((or/c pagenode? pathish?) . -> . hash?)
(define source-path (->source-path (cond
[(pagenode? pagenode-or-path) (pagenode->path pagenode-or-path)]
[else pagenode-or-path])))
(if source-path
(cached-require source-path world:meta-pollen-export)
(error (format "get-metas: no source found for '~a' in directory ~a" pagenode-or-path (current-directory)))))
(define (get-doc pagenode-or-path)
; ((or/c pagenode? pathish?) . -> . (or/c txexpr? string?))
(define source-path (->source-path (cond
[(pagenode? pagenode-or-path) (pagenode->path pagenode-or-path)]
[else pagenode-or-path])))
(if source-path
(cached-require source-path world:main-pollen-export)
(error (format "get-doc: no source found for '~a' in directory ~a" pagenode-or-path (current-directory)))))
(define+provide/contract (->html x)
(xexpr? . -> . string?)
(xexpr->html x))
(provide when/block)
(define-syntax (when/block stx)
(syntax-case stx ()
[(_ condition body ...)
#'(if condition (string-append*
(with-handlers ([exn:fail? (λ(exn) (error (format "within when/block, ~a" (exn-message exn))))])
(map ->string (list body ...))))
"")]))