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pollen/server-routes.rkt

155 lines
6.7 KiB
Racket

#lang racket/base
(require racket/list racket/contract racket/rerequire racket/file racket/format xml)
(require (only-in net/url url-query url->path url->string))
(require (only-in web-server/http/request-structs request-uri request-client-ip))
(require "world.rkt" "regenerate.rkt" "readability.rkt" "predicates.rkt" "debug.rkt")
(module+ test (require rackunit))
;;; Routes for the server module
;;; separated out for ease of testing
;;; because it's tedious to start the server just to check a route.
(provide (all-defined-out))
;; extract main xexpr from a path
(define/contract (file->xexpr path #:regen [regen #t])
((complete-path?) (#:regen boolean?) . ->* . tagged-xexpr?)
(when regen (regenerate path)) ; refresh path
(dynamic-rerequire path) ; stores module mod date; reloads if it's changed
(dynamic-require path 'main))
(module+ test
(check-equal? (file->xexpr (build-path (current-directory) "tests/server-routes/foo.p") #:regen #f) '(root "\n" "foo")))
;; read contents of file to string
;; just file->string with a regenerate option
(define/contract (slurp path #:regen [regen #t])
((complete-path?) (#:regen boolean?) . ->* . string?)
(when regen (regenerate path))
(file->string path))
(module+ test
(check-equal? (slurp (build-path (current-directory) "tests/server-routes/bar.html") #:regen #f) "<html><body><p>bar</p></body></html>"))
;; add a wrapper to tagged-xexpr that displays it as monospaced text
;; for "view source"ish functions
;; takes either a string or an xexpr
(define/contract (format-as-code x)
(xexpr? . -> . tagged-xexpr?)
`(div ((style "white-space:pre-wrap;font-family:AlixFB,monospaced")) ,x))
(module+ test
(check-equal? (format-as-code '(p "foo")) '(div ((style "white-space:pre-wrap;font-family:AlixFB,monospaced")) (p "foo"))))
;; server routes
;; these all produce an xexpr, which is handled upstream by response/xexpr
;; server route that returns html
;; todo: what is this for?
(define/contract (route-html path)
(complete-path? . -> . xexpr?)
(file->xexpr path))
;; server route that returns raw html, formatted as code
;; for viewing source without using "view source"
(define/contract (route-raw-html path)
(complete-path? . -> . xexpr?)
(format-as-code (slurp path #:regen #f)))
;; todo: consolidate with function above, they're the same.
;; server route that shows contents of file on disk
(define/contract (route-source path)
(complete-path? . -> . xexpr?)
(format-as-code (slurp path)))
;; server route that returns xexpr (before conversion to html)
(define/contract (route-xexpr path)
(complete-path? . -> . xexpr?)
(format-as-code (~v (file->xexpr path))))
(define/contract (route-index)
(-> xexpr?)
;; This function generates the Pollen dashboard.
;; First, generate some lists of files.
;; get lists of files by mapping a filter function for each file type
(define-values (pollen-files preproc-files pmap-files template-files)
(let ([all-files-in-project-directory (directory-list pollen-file-root)])
(apply values
(map (λ(test) (filter test all-files-in-project-directory))
(list pollen-source? preproc-source? pmap-source? template-source?)))))
;; The actual post-preproc files may not have been generated yet
;; so calculate their names (rather than rely on directory list)
(define post-preproc-files (map (λ(path) (remove-ext path)) preproc-files))
;; Make a combined list of preproc files and post-preproc file, in alphabetical order
(define all-preproc-files (sort (append preproc-files post-preproc-files)
#:key path->string string<?))
;; calculate names of post-pollen files
;; todo: this isn't quite right. Assumes post-pollen file will have html extension.
;; not necessarily true (it will assume the extension of its template.)
;; But pulling out all the template extensions requires parsing all the files,
;; which is slow and superfluous, since we're trying to be lazy about rendering.
(define post-pollen-files (map (λ(path) (add-ext (remove-ext path) 'html)) pollen-files))
;; Make a combined list of pollen files and post-pollen files, in alphabetical order
(define all-pollen-files (sort (append pollen-files post-pollen-files) #:key path->string string<?))
;; Utility function for making file rows
(define (make-file-row file routes)
;; Utility function for making cells
(define (make-link-cell type)
(let* ([source (add-ext (remove-ext file) POLLEN_SOURCE_EXT)]
[preproc-source (add-ext file POLLEN_PREPROC_EXT)]
[file-string (->string file)]
[name (case type
['direct file-string]
['preproc-source "source"]
[else (->string type)])]
[target (case type
['direct name]
[(source xexpr) (format "/~a/~a" type source)]
['preproc-source (format "/~a/~a" 'raw preproc-source)]
['force (format "/~a?force=true" file-string)]
[else (format "/~a/~a" type file-string)])])
`(td (a ((href ,target)) ,name))))
`(tr ,(make-link-cell 'direct) ,@(map make-link-cell routes)))
(if (andmap empty? (list pmap-files all-pollen-files all-preproc-files template-files))
'(body "No files yet. Get to work!")
`(body
(style ((type "text/css")) "td a { display: block; width: 100%; height: 100%; padding: 8px; }"
"td:hover {background: #eee}")
(table ((style "font-family:Concourse T3;font-size:115%"))
;; options for pmap files and template files
,@(map (λ(file) (make-file-row file '(raw))) (append pmap-files template-files))
;; options for pollen files
,@(map (λ(file) (make-file-row file '(raw source xexpr force))) post-pollen-files)
;; options for preproc files
;; branching in λ is needed so these files can be interleaved on the list
,@(map (λ(file) (make-file-row file '(raw preproc-source))) post-preproc-files)))))
(define (get-query-value url key)
; query is parsed as list of pairs, key is symbol, value is string
; '((key . "value") ... )
(let ([result (memf (λ(x) (equal? (car x) key)) (url-query url))])
(and result (cdar result)))) ; second value of first result
; default route
(define (route-default req)
(define request-url (request-uri req))
(define path (reroot-path (url->path request-url) pollen-file-root))
(define force (equal? (get-query-value request-url 'force) "true"))
(with-handlers ([exn:fail? (λ(e) (message "Default route ignoring" (url->string request-url)))])
(regenerate path #:force force)))