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65#lang racket/base
(require racket/match)
(provide
(struct-out procdef)
read-procdef
read-procdefs)
(define procdef-re
#rx"(?m:([^:]+):[ ]+(.+))\n?")
(struct procdef (name command)
#:transparent)
(define (read-procdef [in (current-input-port)])
(define-values (line col pos)
(port-next-location in))
(match (regexp-match procdef-re in)
[#f
(if (and line col)
(error 'read-procdef "invalid process definition at ~a:~a" line col)
(error 'read-procdef "invalid process definition at pos ~a" pos))]
[(list _ name command) (procdef (bytes->string/utf-8 name)
(bytes->string/utf-8 command))]))
(define (read-procdefs [in (current-input-port)])
(let loop ([procdefs null])
(if (eof-object? (peek-byte in))
(reverse procdefs)
(loop (cons (read-procdef in) procdefs)))))
(module+ test
(require rackunit)
(check-exn
exn:fail?
(lambda _
(read-procdef (open-input-string ""))))
(check-exn
exn:fail?
(lambda _
(read-procdef (open-input-string "web:"))))
(check-equal?
(read-procdef (open-input-string "web: npm start"))
(procdef "web" "npm start"))
(define multiline #<<PROCFILE
assets: npm start
web: raco koyo serve
PROCFILE
)
(let ([multiline-in (open-input-string multiline)])
(check-equal? (read-procdef multiline-in) (procdef "assets" "npm start"))
(check-equal? (read-procdef multiline-in) (procdef "web" "raco koyo serve")))
(let ([multiline-in (open-input-string multiline)])
(check-equal? (read-procdefs multiline-in)
(list (procdef "assets" "npm start")
(procdef "web" "raco koyo serve")))))