219 lines
6.5 KiB
Scheme
219 lines
6.5 KiB
Scheme
;;
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;; members-base.scm
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;;
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;; Storage for member files.
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;;
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;; ISC License
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;;
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;; Copyright 2023 Brmlab, z.s.
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;; Dominik Pantůček <dominik.pantucek@trustica.cz>
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;;
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;; Permission to use, copy, modify, and/or distribute this software
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;; for any purpose with or without fee is hereby granted, provided
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;; that the above copyright notice and this permission notice appear
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;; in all copies.
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;;
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;; THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL
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;; WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED
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;; WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE
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;; AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR
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;; CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS
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;; OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT,
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;; NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
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;; CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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;;
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(declare (unit members-base))
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(module
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members-base
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(
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load-members
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members-base-tests!
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)
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(import scheme
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(chicken base)
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(chicken pathname)
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(chicken file posix)
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(chicken file)
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(chicken format)
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(chicken irregex)
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testing
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utils
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dictionary
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member-file)
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;; Gets all files and symbolic links from given directory. The
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;; symbolic links are represented by cons cells with car being the
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;; name and cdr the link target.
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(define (get-files+symlinks dn)
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(let loop ((fns (directory dn))
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(rs '()))
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(if (null? fns)
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rs
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(let* ((fn (car fns))
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(ffn (make-pathname dn fn)))
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(loop (cdr fns)
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(if (symbolic-link? ffn)
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(cons (cons (string->symbol fn)
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(string->symbol (read-symbolic-link ffn)))
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rs)
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(if (regular-file? ffn)
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(cons (string->symbol fn) rs)
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rs)))))))
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;; Converts a list of symlinks and files in aforementioned format
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;; into a dictionary of regular files as keys with lists of symlinks
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;; as values. If the target file does not exist, adds 'error-0 symbol
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;; as the first alias to this list with the number increasing with
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;; each nonexistent file encountered. The error record is also
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;; generated for symlinks pointing outside of the directory.
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(define (files+symlinks->files-dictionary ls)
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(let* ((links (filter pair? ls))
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(files (filter symbol? ls))
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(fdict
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(let loop ((files files)
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(res (make-dict)))
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(if (null? files)
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res
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(loop (cdr files)
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(dict-set res (car files) '()))))))
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(let loop ((links links)
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(res fdict)
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(errs 0))
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(if (null? links)
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res
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(let* ((link (car links))
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(name (car link))
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(target (cdr link)))
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(if (dict-has-key? res target)
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(loop (cdr links)
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(dict-set res target (cons name (dict-ref res target)))
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errs)
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(loop (cdr links)
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(dict-set res target
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(list (string->symbol (sprintf "error-~A" errs))
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name))
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(+ errs 1))))))))
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;; Checks whether given string is a 4-digit decimal number.
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(define (is-4digit-string? s)
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(if (irregex-search (irregex "^[0-9]{4}$") s)
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#t
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#f))
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;; checks whether given symbol is a 4-digit one.
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(define (is-4digit-symbol? s)
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(is-4digit-string?
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(symbol->string s)))
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;; Returns true if the list contains at least one 4-digit symbol.
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(define (list-contains-4digit-symbol? lst)
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(let loop ((lst lst))
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(if (null? lst)
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#f
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(if (is-4digit-symbol? (car lst))
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#t
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(loop (cdr lst))))))
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;; Returns the first 4-digit symbol from the list.
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(define (get-4digit-symbol-from-list lst)
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(let loop ((lst lst))
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(if (null? lst)
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#f
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(if (is-4digit-symbol? (car lst))
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(car lst)
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(loop (cdr lst))))))
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;; Returns dictionary containing only records with either 4-digit
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;; name or one of its aliases being 4-digit.
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(define (files-dictionary-filter-4digit-symbols d)
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(dict-filter
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(lambda (k v)
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(list-contains-4digit-symbol? (cons k v)))
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d))
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;; Returns a dictionary containing file-name, symlinks, id and info
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;; keys. The info key contains whatever load-member-file from the
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;; member-file module returns. The id key contains whatever is the
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;; first 4-digit symbol in (cons fname aliases) list.
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(define (members-base-load-member mdir fname symlinks)
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(let* ((mr0 (make-dict))
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(mr-fn (dict-set mr0 'file-name fname))
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(mr-sl (dict-set mr-fn 'symlinks symlinks))
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(mr-id (dict-set mr-sl 'id
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(string->number
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(symbol->string
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(get-4digit-symbol-from-list (cons fname symlinks)))))))
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(dict-set mr-id 'info
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(load-member-file
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(make-pathname mdir (symbol->string fname))))))
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;; Loads members database, if the second argument is true, shows
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;; progress. Members database is a dictionary with id being the key
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;; (number) and member record being the value.
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(define (load-members dn . opts)
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(let ((progress? (and (not (null? opts))
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(car opts))))
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(when progress?
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(display "Loading members "))
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(let* ((fss (files-dictionary-filter-4digit-symbols
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(files+symlinks->files-dictionary
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(get-files+symlinks dn))))
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(mb0 (dict-map
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(lambda (symfn symlinks)
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(when progress?
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(display "."))
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(members-base-load-member dn
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symfn
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symlinks))
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fss))
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(mb (dict-reduce (make-dict)
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(lambda (acc symfn mr)
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(dict-set acc (dict-ref mr 'id) mr))
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mb0)))
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(when progress?
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(print " ok."))
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mb)))
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(define (find-member-by-id mb id)
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#f)
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(define (find-member-by-nick mb nick)
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#f)
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(define (list-members-ids mb)
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#f)
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(define (list-members-nicks mb)
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#f)
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;; Performs self-tests of this module.
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(define (members-base-tests!)
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(run-tests
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members-base
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(test-equal? files+symlinks->files-dictionary
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(files+symlinks->files-dictionary
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'(joe (2803 . joe)))
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'((joe 2803)))
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(test-equal? files+symlinks->files-dictionary
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(files+symlinks->files-dictionary
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'(joe
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(2803 . joe)
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(666 . nonexistent)))
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'((nonexistent error-0 666)
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(joe 2803)))
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(test-true is-4digit-string? (is-4digit-string? "0000"))
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(test-false is-4digit-string? (is-4digit-string? "AAAA"))
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(test-false is-4digit-string? (is-4digit-string? "666"))
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(test-true is-4digit-symbol? (is-4digit-symbol? '|0000|))
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(test-false is-4digit-symbol? (is-4digit-symbol? '|ABC|))
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(test-true list-contains-4digit-symbol? (list-contains-4digit-symbol? '(|0000| abc |666|)))
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(test-false list-contains-4digit-symbol? (list-contains-4digit-symbol? '(|00000| abc |666|)))
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(test-eq? get-4digit-symbol-from-list
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(get-4digit-symbol-from-list '(|000| abc |6666| qwer))
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'|6666|)
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))
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)
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