60 lines
2.0 KiB
Scheme
60 lines
2.0 KiB
Scheme
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(library (ikarus.apropos)
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(export apropos)
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(import
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(except (ikarus) apropos)
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(only (psyntax library-manager) library-subst library-name))
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(define (compose f g)
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(lambda (x) (f (g x))))
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(define (match-maker s1)
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(let ([n1 (string-length s1)])
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(lambda (s2)
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(let ([m (fx- (string-length s2) n1)])
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(let f ([i2 0])
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(and (fx<=? i2 m)
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(or (let g ([i1 0] [i2 i2])
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(or (fx= i1 n1)
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(and (char=? (string-ref s1 i1)
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(string-ref s2 i2))
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(g (fx+ i1 1) (fx+ i2 1)))))
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(f (fx+ i2 1)))))))))
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(define ($apropos-list name who)
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(let ([name
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(cond
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[(string? name) name]
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[(symbol? name) (symbol->string name)]
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[else
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(die who "not a string or symbol" name)])])
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(let ([libs (installed-libraries)]
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[matcher
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(compose (match-maker name)
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(compose symbol->string car))])
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(fold-right
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(lambda (lib rest)
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(let ([ls (filter matcher (library-subst lib))])
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(if (null? ls)
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rest
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(cons (cons (library-name lib) (map car ls)) rest))))
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'()
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(list-sort
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(lambda (lib1 lib2)
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(let f ([ls1 (library-name lib1)] [ls2 (library-name lib2)])
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(and (pair? ls2)
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(or (null? ls1)
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(let ([s1 (symbol->string (car ls1))]
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[s2 (symbol->string (car ls2))])
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(or (string<? s1 s2)
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(and (string=? s1 s2)
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(f (cdr ls1) (cdr ls2)))))))))
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(installed-libraries))))))
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(define (apropos name)
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(for-each
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(lambda (x) (printf "~a:\n ~a\n" (car x) (cdr x)))
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($apropos-list name 'apropos))))
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