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pollen/render.rkt

222 lines
12 KiB
Racket

#lang racket/base
(require racket/file racket/path racket/match compiler/cm)
(require sugar/test sugar/define sugar/file)
(require "file.rkt" "cache.rkt" "world.rkt" "debug.rkt" "pagetree.rkt" "project.rkt" "template.rkt" "rerequire.rkt" "cache-ns.rkt")
;; used to track renders according to modification dates of component files
(define mod-date-hash (make-hash))
;; when you want to generate everything fresh.
;; render functions will always go when no mod-date is found.
(define (reset-mod-date-hash)
(set! mod-date-hash (make-hash)))
(module-test-internal
(check-pred hash? mod-date-hash))
;; using internal contracts to provide some extra safety (negligible performance hit)
(define/contract (valid-path-arg? x)
(any/c . -> . boolean?)
(or (equal? #f x) (complete-path? x)))
(define/contract (valid-path-args? x)
(any/c . -> . boolean?)
(and (list? x) (andmap valid-path-arg? x)))
(module-test-internal
(require racket/runtime-path)
(define-runtime-path sample-dir "test/data/samples")
(define samples (parameterize ([current-directory sample-dir])
(map path->complete-path (directory-list "."))))
(define-values (sample-01 sample-02 sample-03) (apply values samples)))
(define/contract (path->mod-date-value path)
((or/c #f complete-path?) . -> . (or/c #f integer?))
(and path (file-exists? path) (file-or-directory-modify-seconds path)))
(module-test-internal
(check-false (path->mod-date-value (path->complete-path "garbage-path.zzz")))
(check-equal? (path->mod-date-value sample-01) (file-or-directory-modify-seconds sample-01)))
;; each key for mod-date-hash is a list of file / mod-date pairs (using pollen/cache keymaking function)
;; when a file is rendered, a new key is stored in the hash (with trivial value #t)
;; after that, the hash-key-comparision routine intrinsic to hash lookup
;; can be used to test whether a render is obsolete.
;; create a new key with current files. If the key is in the hash, the render has happened.
;; if not, a new render is needed.
(define (update-mod-date-hash source-path template-path)
(hash-set! mod-date-hash (paths->key source-path template-path) #t))
(define (mod-date-missing-or-changed? source-path template-path)
(not (hash-has-key? mod-date-hash (paths->key source-path template-path))))
(define (list-of-pathish? x) (and (list? x) (andmap pathish? x)))
(define/contract+provide (render-batch . xs)
(() #:rest list-of-pathish? . ->* . void?)
;; Why not just (map render ...)?
;; Because certain files will pass through multiple times (e.g., templates)
;; And with render, they would be rendered repeatedly.
;; Using reset-modification-dates is sort of like session control.
(reset-mod-date-hash)
(for-each (λ(x) ((if (pagetree-source? x)
render-pagetree
render-from-source-or-output-path) x)) xs))
(define/contract+provide (render-pagetree pagetree-or-path)
((or/c pagetree? pathish?) . -> . void?)
(define pagetree (if (pagetree? pagetree-or-path)
pagetree-or-path
(cached-require pagetree-or-path (world:current-main-export))))
(parameterize ([current-directory (world:current-project-root)])
(for-each render-from-source-or-output-path (map ->complete-path (pagetree->list pagetree)))))
(define/contract+provide (render-from-source-or-output-path so-pathish)
(pathish? . -> . void?)
(let ([so-path (->complete-path so-pathish)]) ; so-path = source or output path (could be either)
(cond
[(ormap (λ(test) (test so-path)) (list has/is-null-source? has/is-preproc-source? has/is-markup-source? has/is-scribble-source? has/is-markdown-source? has/is-template-source?))
(let-values ([(source-path output-path) (->source+output-paths so-path)])
(render-to-file-if-needed source-path output-path))]
[(pagetree-source? so-path) (render-pagetree so-path)]))
(void))
(define/contract (render-needed? source-path template-path output-path)
(complete-path? (or/c #f complete-path?) complete-path? . -> . (or/c #f symbol?))
;; return symbol rather than boolean for extra debugging information
(cond
[(not (file-exists? output-path)) 'file-missing]
[(mod-date-missing-or-changed? source-path template-path) 'mod-key-missing-or-changed]
[(let-values ([(source-dir source-name _) (split-path source-path)])
(not (world:current-render-cache-active source-dir))) 'render-cache-deactivated]
[else #f]))
(define/contract+provide (render-to-file-if-needed source-path [template-path #f] [maybe-output-path #f])
((complete-path?) ((or/c #f complete-path?) (or/c #f complete-path?)) . ->* . void?)
(define output-path (or maybe-output-path (->output-path source-path)))
(define template-path (get-template-for source-path))
(when (render-needed? source-path template-path output-path)
(render-to-file source-path template-path output-path)))
(define/contract+provide (render-to-file source-path [template-path #f] [maybe-output-path #f])
((complete-path?) ((or/c #f complete-path?) (or/c #f complete-path?)) . ->* . void?)
(define output-path (or maybe-output-path (->output-path source-path)))
(define render-result (render source-path template-path)) ; will either be string or bytes
(display-to-file render-result output-path #:exists 'replace
#:mode (if (string? render-result) 'text 'binary)))
(define/contract+provide (render source-path [template-path #f])
((complete-path?) ((or/c #f complete-path?)) . ->* . (or/c string? bytes?))
(define render-proc
(cond
[(ormap (λ(test render-proc) (and (test source-path) render-proc))
(list has/is-null-source? has/is-preproc-source? has/is-markup-source? has/is-scribble-source? has/is-markdown-source? has/is-template-source?)
(list render-null-source render-preproc-source render-markup-or-markdown-source render-scribble-source render-markup-or-markdown-source render-preproc-source))]
[else (error (format "render: no rendering function found for ~a" source-path))]))
(message (format "rendering: /~a" (find-relative-path (world:current-project-root) source-path)))
(define render-result (apply render-proc (cons source-path (if template-path (list template-path) null))))
;; wait till last possible moment to store mod dates, because render-proc may also trigger its own subrenders
;; e.g., of a template.
(update-mod-date-hash source-path template-path)
render-result)
(define/contract (render-null-source source-path)
(complete-path? . -> . bytes?)
;; All this does is copy the source. Hence, "null".
;; todo: add test to avoid copying if unnecessary (good idea in case the file is large)
(file->bytes source-path))
(define/contract (render-scribble-source source-path)
(complete-path? . -> . string?)
(match-define-values (source-dir source-filename _) (split-path source-path))
(dynamic-rerequire source-path) ; to suppress namespace caching by dynamic-require below
(define scribble-render (dynamic-require 'scribble/render 'render))
(time (parameterize ([current-directory (->complete-path source-dir)])
;; if there's a compiled zo file for the Scribble file,
;; (as is usually the case in existing packages)
;; it will foul up the render
;; so recompile first to avoid "can't redefine a constant" errors.
(managed-compile-zo source-path)
;; BTW this next action has side effects: scribble will copy in its core files if they don't exist.
(scribble-render (list (dynamic-require source-path 'doc)) (list source-path))))
(define result (file->string (->output-path source-path)))
(delete-file (->output-path source-path)) ; because render promises the data, not the side effect
result)
(define/contract (render-preproc-source source-path)
(complete-path? . -> . (or/c string? bytes?))
(match-define-values (source-dir _ _) (split-path source-path))
(time (parameterize ([current-directory (->complete-path source-dir)])
(render-through-eval `(begin (require pollen/cache)(cached-require ,source-path ',(world:current-main-export)))))))
(define/contract (render-markup-or-markdown-source source-path [maybe-template-path #f])
((complete-path?) ((or/c #f complete-path?)) . ->* . (or/c string? bytes?))
(match-define-values (source-dir _ _) (split-path source-path))
(define template-path (or maybe-template-path (get-template-for source-path)))
(render-from-source-or-output-path template-path) ; because template might have its own preprocessor source
(define expr-to-eval
`(begin
(require (for-syntax racket/base))
(require pollen/include-template pollen/cache pollen/debug pollen/pagetree)
,(require-directory-require-files source-path)
(parameterize ([current-pagetree (make-project-pagetree ,(world:current-project-root))])
(let ([,(world:current-main-export) (cached-require ,(path->string source-path) ',(world:current-main-export))]
[,(world:current-meta-export) (cached-require ,(path->string source-path) ',(world:current-meta-export))])
(local-require pollen/template pollen/top)
(define here (metas->here ,(world:current-meta-export)))
(cond
[(bytes? ,(world:current-main-export)) ,(world:current-main-export)] ; if main export is binary, just pass it through
[else
;; `include-template` is the slowest part of the operation (the eval itself is cheap)
(include-template #:command-char ,(world:current-command-char) (file ,(->string (find-relative-path source-dir template-path))))])))))
(time (parameterize ([current-directory (->complete-path source-dir)]) ; because include-template wants to work relative to source location
(render-through-eval expr-to-eval))))
(define/contract (templated-source? path)
(complete-path? . -> . boolean?)
(or (markup-source? path) (markdown-source? path)))
(define/contract+provide (get-template-for source-path)
(complete-path? . -> . (or/c #f complete-path?))
(match-define-values (source-dir _ _) (split-path source-path))
(and (templated-source? source-path) ; doesn't make sense if it's not a templated source format
(let ([output-path (->output-path source-path)])
(or ; Build the possible paths and use the first one that either exists, or has existing source (template, preproc, or null)
(ormap (λ(p) (if (ormap file-exists? (list p (->template-source-path p) (->preproc-source-path p) (->null-source-path p))) p #f))
(filter (λ(x) (->boolean x)) ; if any of the possibilities below are invalid, they return #f
(list
;; this op touches the cache so set up current-directory correctly
(parameterize ([current-directory (world:current-project-root)])
(let ([source-metas (cached-require source-path (world:current-meta-export))])
(and (hash-has-key? source-metas (->symbol (world:current-template-meta-key)))
(build-path source-dir (select-from-metas (->string (world:current-template-meta-key)) source-metas))))) ; path based on metas
(and (filename-extension output-path) (build-path (world:current-project-root)
(add-ext (world:current-default-template-prefix) (get-ext output-path))))))) ; path to default template
(and (filename-extension output-path) (build-path (world:current-server-extras-path) (add-ext (world:current-fallback-template-prefix) (get-ext output-path)))))))) ; fallback template
(define/contract (render-through-eval expr-to-eval)
(list? . -> . (or/c string? bytes?))
(parameterize ([current-namespace (make-base-namespace)]
[current-output-port (current-error-port)])
(eval expr-to-eval)))