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pollen/setup.rkt

137 lines
4.2 KiB
Racket

#lang racket/base
(require racket/system racket/port racket/file
racket/class racket/list)
(require "debug.rkt" sugar "world.rkt")
(provide setup)
(define cd (current-directory))
(define test-mode (make-parameter #f))
;; simple class for setup tasks
(define task%
(class object%
(init do-proc [undo-proc #f])
(define this-do do-proc)
(define this-undo undo-proc)
(super-new)
(define/public (do-task) (this-do))
(define/public (undo-task) (if this-undo (this-undo) (void)))))
;; function for invoking method of multiple objects
(define-syntax send-each
(syntax-rules ()
;; invoke a method of every object in list
[(send-each objects do-method)
(for-each (λ(obj) (send obj do-method)) objects)]
;; invoke a method of every object in list, but
;; if error, invoke the undo method all the way backwards
;; allows structured cleanup
[(send-each objects do-method undo-method)
(begin
(define (send-stack-inner objects-inner)
(if (empty? objects-inner)
(void)
(with-handlers ([exn:fail? (λ(err)
(begin
(send (car objects-inner) undo-method)
(raise err)))])
(send (car objects-inner) do-method)
(send-stack-inner (cdr objects-inner)))))
;; error has been handled all the way back up the stack
;; so kill it here
(with-handlers ([exn:fail? (λ(err) (void))])
(send-stack-inner objects)))]))
(define (make-polcom-data racket-path)
(format "#! ~a
#lang racket/base
(require pollen/command)
;; pollen setup run in ~a on ~a"
racket-path
cd
(format "~a at ~a" (make-datestamp) (make-timestamp))))
;; task: get confirmation
(define (get-confirmation)
(message (format "Set up ~a as a pollen directory? ['y' or 'yes']" cd))
(define setup-confirm (->string (read)))
(when (not (ormap (λ(input)(equal? setup-confirm input)) (list "y" "yes")))
(error))
(message (format "Setting up ~a as a pollen directory" cd)))
(define (abort-confirmation)
(message "Aborting setup"))
(define confirm-setup
(new task%
[do-proc get-confirmation]
[undo-proc abort-confirmation]))
;; task: make polcom file
(define (delete-polcom-file-if-existing)
(when (file-exists? COMMAND_FILE)
(begin
(message (format "Deleting existing polcom file in ~a" cd))
(delete-file COMMAND_FILE))))
(define (save-polcom-file)
(define path-to-racket-exists? (> (len RACKET_PATH) 0))
(if path-to-racket-exists?
(let ([polcom-data (make-polcom-data RACKET_PATH)])
(message (format "Using ~a as racket path" RACKET_PATH))
(delete-polcom-file-if-existing)
(message (format "Creating new polcom file in ~a" cd))
(if (not (test-mode))
(begin
(display-to-file polcom-data COMMAND_FILE)
(with-output-to-string (λ() (system (format "chmod 755 ~a" COMMAND_FILE)))))
(message "[test mode: file would be saved now]")))
(begin
(message "No path to Racket binary")
(error))))
(define (abort-polcom-file)
(message "Couldn't create polcom file")
(delete-polcom-file-if-existing))
(define make-polcom
(new task%
[do-proc save-polcom-file]
[undo-proc abort-polcom-file]))
;; task: report success
(define (success-messages)
(message "Setup complete")
(define path-to-polcom (format "~a~a" cd COMMAND_FILE))
(message (format "Run '~a start' to start project server" path-to-polcom))
(message (format "Or run '~a help' for a list of commands" path-to-polcom))
(when (not (test-mode)) (exit)))
(define report-success
(new task%
[do-proc success-messages]))
(define (setup)
(define tasks (list confirm-setup make-polcom report-success))
(send-each tasks do-task undo-task))
;; better way to do this is to create separate removal tasks
;; (that may rely on some of the same intermediate functions)
;; so that errors can be caught on the way out too.
;; also, remove conflicts with existing racket name
;;(define (remove)
;; (send-each (reverse tasks) remove-task))
(module+ main
(parameterize ([test-mode #t])
(setup)))