;; Utilities for creating a .plt package
(module pack scheme/base
  (require file/gzip
           net/base64
           scheme/system
           scheme/port
           scheme/file
           setup/getinfo)

  (provide pack
	   pack-plt
	   mztar
	   std-filter
	   pack-collections
	   pack-collections-plt)

  (define (x-arg-needs-true-arg who arg1-name v arg2-name)
    (error who (string-append "true value for `~a' argument: ~e "
                              "requires a true value for `~a' argument")
	   arg1-name v arg2-name))

  (define (pack dest name paths collections
                [file-filter   std-filter]
                [encode?       #t]
                [file-mode     'file]
                [unpack-unit   #f]
                [plt-relative? #t]
                [requires      null]
                [conflicts     null]
                [at-plt-home?  #f])
    (pack-plt dest name paths
              #:collections   collections
              #:file-filter   file-filter
              #:encode?       encode?
              #:file-mode     file-mode
              #:unpack-unit   unpack-unit
              #:plt-relative? plt-relative?
              #:requires      null
              #:conflicts     null
              #:at-plt-home?  at-plt-home?))
  
  (define (pack-plt dest name paths
                    #:collections   [collections   null]
                    #:file-filter   [file-filter   std-filter]
                    #:encode?       [encode?       #t]
                    #:file-mode     [file-mode     'file]
                    #:unpack-unit   [unpack-unit   #f]
                    #:plt-relative? [plt-relative? #t]
                    #:requires      [requires      null]
                    #:conflicts     [conflicts     null]
                    #:at-plt-home?  [at-plt-home?  #f]
                    #:test-plt-dirs [test-plt-dirs #f])
    (when (and at-plt-home? (not plt-relative?))
      (x-arg-needs-true-arg 'pack-plt 'at-plt-home? at-plt-home? 'plt-relative?))
    (when (and test-plt-dirs (not at-plt-home?))
      (x-arg-needs-true-arg 'pack-plt 'test-plt-dirs test-plt-dirs 'at-plt-home?))
    (let*-values ([(file) (open-output-file dest #:exists 'truncate/replace)]
                  [(fileout thd)
                   (if encode?
                     (let-values ([(b64-out b64-in) (make-pipe 4096)]
                                  [(gz-out gz-in) (make-pipe 4096)])
                       (thread
                        (lambda ()
                          (let ([normal (lambda ()
                                          (gzip-through-ports gz-out b64-in #f 0)
                                          (close-output-port b64-in))]
                                [gzip (find-executable-path "gzip" #f)])
                            (if gzip
                              (let ([p (process* gzip "-c")])
                                (if (eq? 'running ((list-ref p 4) 'status))
                                  (begin
                                    ;; Use gzip process.
                                    ;; Errors to error port:
                                    (thread
                                     (lambda ()
                                       (dynamic-wind
                                         void
                                         (lambda ()
                                           (copy-port (cadddr p) (current-error-port)))
                                         (lambda ()
                                           (close-input-port (cadddr p))))))
                                    ;; Copy input to gzip:
                                    (thread
                                     (lambda ()
                                       (dynamic-wind
                                         void
                                         (lambda ()
                                           (copy-port gz-out (cadr p)))
                                         (lambda ()
                                           (close-input-port gz-out)
                                           (close-output-port (cadr p))))))
                                    ;; Copy input to b64:
                                    (dynamic-wind
                                      void
                                      (lambda ()
                                        (copy-port (car p) b64-in))
                                      (lambda ()
                                        (close-input-port (car p))
                                        (close-output-port b64-in))))
                                  (normal)))
                              (normal)))))
                       (values gz-in
                               (thread
                                (lambda ()
                                  (base64-encode-stream b64-out file)
                                  (close-output-port file)))))
                     (values file (thread void)))])
      (fprintf fileout "PLT\n")
      (write `(lambda (request failure)
                (case request
                  [(name) ,name]
                  [(unpacker) 'mzscheme]
                  [(requires) ',requires]
                  [(conflicts) ',conflicts]
                  [(plt-relative?) ,plt-relative?]
                  [(plt-home-relative?) ,(and plt-relative? at-plt-home?)]
                  [(test-plt-dirs)
                   ,(and plt-relative? at-plt-home? `',test-plt-dirs)]
                  [else (failure)]))
             fileout)
      (newline fileout)
      (write (or unpack-unit
                 `(unit (import main-collects-parent-dir mzuntar) (export)
                    (mzuntar void)
                    (quote ,collections)))
             fileout)
      (newline fileout)
      (for-each (lambda (path)
                  (mztar (simplify-path path #f) fileout file-filter file-mode))
                paths)
      (close-output-port fileout)
      (thread-wait thd)))

  (define (element->string x)
    (if (path? x) (path->string x) x))

  (define (mztar path output file-filter file-mode)
    (define (path->list p)
      (if (eq? p 'same)
        null
        (let-values ([(base name dir?) (split-path p)])
          (if (path? base)
            (append (path->list base) (list name))
            (list name)))))
    (define-values (init-dir init-files)
      (if (file-exists? path)
        (let-values ([(base name dir?) (split-path path)])
          (values (if (eq? base 'relative) 'same base) (list name)))
        (values (if (string? path) (string->path path) path) #f)))

    (let loop ([dir init-dir] [dpath (path->list init-dir)] [files init-files])
      (printf "MzTarring ~a...\n"
	      (path->string
	       (if files
		   (build-path dir (car files))
		   dir)))
      (fprintf output "~s\n~s\n" 'dir (map element->string dpath))
      (for-each
       (lambda (f)
         (let* ([p (build-path dir f)]
                [filter-val (file-filter p)])
           (when filter-val
             (if (directory-exists? p)
               (loop p (append dpath (list f)) #f)
               (let ([len (file-size p)])
                 ;; (printf "MzTarring ~a\n" p)
                 (fprintf output "~s\n~s\n~s\n*"
                          (case filter-val
                            [(file) 'file]
                            [(file-replace) 'file-replace]
                            [else file-mode])
                          (map element->string (append dpath (list f)))
                          len)
                 (call-with-input-file* p
                   (lambda (p) (copy-port p output))))))))
       (or files (sort (map element->string (directory-list dir)) string<?)))))

  (define (std-filter path)
    (let-values ([(base name dir?) (split-path path)])
      (let ([name (path->bytes name)])
	(not (or (regexp-match? #rx#"^(?:[.](?:git.*|svn|cvsignore)|CVS|compiled|doc)$"
                                name)
		 (regexp-match? #rx#"~$|^#.*#$|^[.]#" name)
		 (regexp-match? #rx#"[.]plt$" name))))))

  (define (pack-collections output name collections replace? extra-setup-collections
                            [file-filter std-filter] [at-plt-home? #f])
    (pack-collections-plt output name collections
                          #:replace? replace?
                          #:extra-setup-collections extra-setup-collections
                          #:file-filter file-filter
                          #:at-plt-home? at-plt-home?))

  (define (pack-collections-plt output name collections
                                #:replace? [replace? #f]
                                #:extra-setup-collections [extra-setup-collections null]
                                #:file-filter [file-filter std-filter]
                                #:at-plt-home? [at-plt-home? #f]
                                #:test-plt-collects? [test-plt-collects? #t])
    (let-values
        ([(dir source-files requires conflicts name)
          (let ([dirs (map (lambda (cp) (apply collection-path cp)) collections)])
            ;; Figure out the base path:
            (let* ([base-path #f]
                   [base-path-setter #f]
                   [rel-paths
                    (map (lambda (dir coll)
                           (let*-values ([(base c-name dir?) (split-path dir)]
                                         [(base subdir)
                                          (let loop ([l (cdr coll)][base base])
                                            (let-values ([(base x-name dir?) (split-path base)])
                                              (if (null? l)
                                                (values base x-name)
                                                (let-values ([(base subdir) (loop (cdr l) base)])
                                                  (values base (build-path subdir x-name))))))])
                             (if base-path
                               (unless (equal? base base-path)
                                 (error 'mzc
                                        "cannot combine collections that live in different directories: \"~a\" and: \"~a\""
                                        base-path-setter
                                        dir))
                               (begin (set! base-path-setter dir)
                                      (set! base-path base)))
                             (build-path 'same subdir c-name)))
                         dirs collections)]
                   [infos (map (lambda (cp) (get-info cp)) collections)]
                   [coll-list?
                    (lambda (cl)
                      (and (list? cl)
                           (andmap (lambda (c)
                                     (and (list? c)
                                          (andmap string? c)
                                          (andmap relative-path? c)))
                                   cl)))]
                   [get-dep-coll
                    (lambda (which)
                      (apply append
                             (map (lambda (i src-cp)
                                    (let ([rl (if i
                                                (i which (lambda () null))
                                                null)])
                                      (unless (coll-list? rl)
                                        (error 'mzc "bad ~a specification in info.rkt for collection ~s"
                                               which src-cp))
                                      rl))
                                  infos collections)))])
              (values base-path
                      rel-paths
                      (get-dep-coll 'requires)
                      (append (if replace? null collections)
                              (get-dep-coll 'conflicts))
                      (or name
                          ((or (car infos) (lambda (n f) (caar collections)))
                           'name
                           (lambda () (caar collections)))))))])
      (let ([output (path->complete-path output)])
        (parameterize ([current-directory dir])
          (pack-plt
           output name
           source-files
           #:collections (append extra-setup-collections
                                 (filter get-info collections))
           #:file-filter file-filter
           #:file-mode (if replace? 'file-replace 'file)
           #:plt-relative? #t
           #:requires
           ;; For each require, get current version
           (map (lambda (r)
                  (let ([i (get-info r)])
                    (let ([v (and i (i 'version (lambda () #f)))])
                      (if v
                        (begin
                          (unless (and (list? v)
                                       (andmap number? v)
                                       (andmap exact? v)
                                       (andmap integer? v))
                            (error
                             'mzc
                             "bad version specification in info.rkt for collection ~s"
                             r))
                          (list r v))
                        (list r null)))))
                requires
                ;; Packer used to automatically include "mzscheme"
                ;; dependency, but we've conlcuded that dependencies
                ;; aren't typically useful.
                #;
                (cons '("mzscheme") requires))
           #:conflicts conflicts
           #:at-plt-home? at-plt-home?
           #:test-plt-dirs (and at-plt-home? test-plt-collects?
                                '("collects"))))))))
