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Re-implement (part of) define-view in view.scm

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This new macro should replace most of the functionality of the old
one, for the moment it only allows specification of what to print how.
This commit is contained in:
Tom Willemsen 2012-10-04 11:08:19 +02:00
parent d6c24c4346
commit bf68193be8
2 changed files with 22 additions and 57 deletions
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56
undone/main.scm
View file

@ -23,62 +23,6 @@
((_ key alist)
#'(get-field-value key alist #f)))))
(define-syntax define-view
(lambda (x)
(syntax-case x (where sort-by)
((_ name doc fmt fields fields* ...
where predicate
sort-by sort-predicate sort-field)
(with-syntax ((view-name
(datum->syntax
x (symbol-append (syntax->datum #'name) '-view)))
(filtered-list
#`(filter (lambda (elm)
(and #,@(map
(lambda (field)
#`(get-field #,field elm))
#'(fields fields* ...))))
todo-list)))
#`(begin
(define (view-name)
doc
(for-each
(lambda (item)
(let (#,@(map
(lambda (field)
#`(#,field (get-field-value #,field item)))
#'(fields fields* ...)))
(if predicate
(format #t fmt
#,@(map (lambda (field)
field)
#'(fields fields* ...))))))
#,(if (syntax->datum #'sort-predicate)
#`(stable-sort
filtered-list
(lambda (a b)
(sort-predicate
(get-field-value sort-field a)
(get-field-value sort-field b))))
#'filtered-list)))
(set! view-list
(append view-list
(list (cons 'name view-name)))))))
((_ name doc fmt fields fields* ...
sort-by sort-predicate sort-field)
#'(define-view name doc fmt fields fields* ...
where #t
sort-by sort-predicate sort-field))
((_ name doc fmt fields fields* ...
where predicate)
#'(define-view name doc fmt fields fields* ...
where predicate
sort-by #f nil))
((_ name doc fmt fields fields* ...)
#'(define-view name doc fmt fields fields* ...
where #t
sort-by #f nil)))))
(define (stored-file xdg-env file)
"Try to get FILE stored either in XDG-ENV or the home directory."
(let ((xdg (getenv xdg-env))

23
undone/view.scm
View file

@ -1,7 +1,28 @@
(define-module (undone view)
#:use-module (oop goops)
#:export (<view> view-list sort-view filter-view print-item
get-list-for print-view view-doc))
get-list-for print-view view-doc define-view))
(define-syntax define-view
(lambda (x)
(syntax-case x (item)
((_ name doc print-item-form)
(with-syntax ((view-name
(datum->syntax
x (symbol-append '< (syntax->datum #'name) '-view>)))
(item (datum->syntax x 'item)))
#`(begin
(define-class view-name (<view>))
(define-method (view-doc (v view-name))
doc)
(define-method (print-item (v view-name) item)
print-item-form)
(set! view-list
(append view-list
(list (cons 'name view-name))))))))))
(define-generic sort-view)
(define-generic filter-view)