Re: [FEATURE] List all available languages

[Nala Ginrut <nalaginrut@gmail.com>]

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On Wed, 2013-01-23 at 19:28 +0800, Nala Ginrut wrote:
> As I talked with Andy, we may add a feature to list all available
> languages. And if users add a new language to the %load-path, they may
> see it listed out. Besides, this feature could be used in 'guild
> compile' to detect all the language available.
> 
> Attached is a proc named 'get-all-available-languages', it'll scan all %
> load-path and list the union of the languages available. 
> 
> Please review it.
> If accepted, I'll format a patch into (ice-9 command-line).
> 
> Thanks!

I think Regular Expression would better choice ;-p
New patch attached.


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(use-modules (ice-9 ftw) (srfi srfi-1))

(define (not-inner-lang? str)
  (not (string-match 
	"glil|glil\\.scm|assembly|assembly\\.scm|bytecode|objcode\\.scm|objcode|tree-il|tree-il\\.scm|value|\\.\\.|\\." 
	str)))
    

(define (get-all-available-languages)
  (let lp((rest (map (lambda (x) (string-append x "/language")) %load-path)) (result '()))
    (cond
     ((null? rest) (apply lset-union string=? result))
     (else 
      (let ((ll (scandir (car rest) not-inner-lang?)))
	(lp (cdr rest) (if ll (cons ll result) result)))))))