breezewiki/src/config.rkt

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#lang racket/base
(require racket/function
racket/pretty
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racket/runtime-path
racket/string
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ini)
(provide
config-parameter
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config-true?
config-get)
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(define-runtime-path path-config "../config.ini")
(define (config-parameter key)
(hash-ref config key))
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(define (config-true? key)
(not (member ((config-parameter key)) '("" "false"))))
(define (config-get key)
((config-parameter key)))
(define default-config
'((application_name . "BreezeWiki")
(canonical_origin . "")
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(debug . "false")
(instance_is_official . "false") ; please don't turn this on, or you will make me very upset
(port . "10416")
(strict_proxy . "true")))
(define loaded-alist
(with-handlers
([exn:fail:filesystem:errno?
(λ (exn)
(begin0
'()
(displayln "note: config file not detected, using defaults")))]
[exn:fail:contract?
(λ (exn)
(begin0
'()
(displayln "note: config file empty or missing [] section, using defaults")))])
(define l
(hash->list
(hash-ref
(ini->hash
(call-with-input-file path-config
(λ (in)
(read-ini in))))
'||)))
(begin0
l
(printf "note: ~a items loaded from config file~n" (length l)))))
(define env-alist
(let ([e-names (environment-variables-names (current-environment-variables))]
[e-ref (λ (name) (bytes->string/latin-1 (environment-variables-ref (current-environment-variables) name)))])
(map (λ (name) (cons (string->symbol (string-downcase (substring (bytes->string/latin-1 name) 3)))
(e-ref name)))
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(filter (λ (name) (string-prefix? (string-downcase (bytes->string/latin-1 name)) "bw_")) e-names))))
(when (> (length env-alist) 0)
(printf "note: ~a items loaded from environment variables~n" (length env-alist)))
(define combined-alist (append default-config loaded-alist env-alist))
(define config
(make-hasheq
(map (λ (pair)
(cons (car pair) (make-parameter (cdr pair))))
combined-alist)))
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(when (config-true? 'debug)
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; all values here are optimised for maximum prettiness
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(parameterize ([pretty-print-columns 80])
(display "config: ")
(pretty-write (sort
(hash->list (make-hasheq combined-alist))
symbol<?
#:key car))))