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(define configf:section-rx (regexp "^\\[(.*)\\]\\s*$"))
(define configf:blank-l-rx (regexp "^\\s*$"))
(define configf:key-sys-pr (regexp "^(\\S+)\\s+\\[system\\s+(\\S+.*)\\]\\s*$"))
(define configf:key-val-pr (regexp "^(\\S+)\\s+(.*)$"))
(define configf:comment-rx (regexp "^\\s*#.*"))
(define configf:cont-ln-rx (regexp "^(\\s+)(\\S+.*)$"))
;; read a line and process any #{ ... } constructs
(define configf:var-expand-regex (regexp "^(.*)#\\{([^\\}\\{]*)\\}(.*)"))
(define (configf:process-line l)
(let loop ((res l))
(if (string? res)
(let ((matchdat (string-search configf:var-expand-regex res)))
(if matchdat
(let ((prestr (cadr matchdat))
(cmd (caddr matchdat))
(poststr (cadddr matchdat))
(result #f))
(with-input-from-string (conc "(" cmd ")")
(lambda ()
(set! result (eval (read)))))
(loop (conc prestr result poststr)))
res))
res)))
(define (shell cmd)
(let* ((output (cmd-run->list cmd))
(res (car output))
(status (cadr output)))
(if (equal? status 0)
(string-intersperse
res
"\n")
(begin
(with-output-to-port (current-error-port)
(print "ERROR: " cmd " returned bad exit code " status))
""))))
(define-inline (configf:read-line p)
(configf:process-line (read-line p)))
;; read a config file, returns hash table of alists
;; read a config file, returns hash table of alists
;; adds to ht if given (must be #f otherwise)
;; envion-patt is a regex spec that identifies sections that will be eval'd
;; in the environment on the fly
(define (read-config path ht allow-system #!key (environ-patt #f))
(debug:print 4 "INFO: read-config " path " allow-system " allow-system " environ-patt " environ-patt)
(if (not (file-exists? path))
(if (not ht)(make-hash-table) ht)
(let ((inp (open-input-file path))
(res (if (not ht)(make-hash-table) ht)))
(let loop ((inl (read-line inp))
(let loop ((inl (configf:read-line inp)) ;; (read-line inp))
(curr-section-name "default")
(var-flag #f);; turn on for key-var-pr and cont-ln-rx, turn off elsewhere
(lead #f))
(if (eof-object? inl)
(begin
(close-input-port inp)
res)
(regex-case
inl
(configf:comment-rx _ (loop (read-line inp) curr-section-name #f #f))
(configf:blank-l-rx _ (loop (read-line inp) curr-section-name #f #f))
(configf:comment-rx _ (loop (configf:read-line inp) curr-section-name #f #f))
(configf:blank-l-rx _ (loop (configf:read-line inp) curr-section-name #f #f))
(configf:include-rx ( x include-file ) (begin
(read-config include-file res allow-system environ-patt: environ-patt)
(loop (read-line inp) curr-section-name #f #f)))
(configf:section-rx ( x section-name ) (loop (read-line inp) section-name #f #f))
(loop (configf:read-line inp) curr-section-name #f #f)))
(configf:section-rx ( x section-name ) (loop (configf:read-line inp) section-name #f #f))
(configf:key-sys-pr ( x key cmd ) (if allow-system
(let ((alist (hash-table-ref/default res curr-section-name '()))
(val-proc (lambda ()
(let* ((cmdres (cmd-run->list cmd))
(status (cadr cmdres))
(res (car cmdres)))
(if (not (eq? status 0))
(begin
(debug:print 0 "ERROR: problem with " inl ", return code " status)
(exit 1)))
(if (null? res)
""
(string-intersperse res " "))))))
(hash-table-set! res curr-section-name
(config:assoc-safe-add alist
key
(case allow-system
((return-procs) val-proc)
((return-string) cmd)
(else (val-proc)))))
(loop (read-line inp) curr-section-name #f #f))
(loop (read-line inp) curr-section-name #f #f)))
(loop (configf:read-line inp) curr-section-name #f #f))
(loop (configf:read-line inp) curr-section-name #f #f)))
(configf:key-val-pr ( x key val ) (let* ((alist (hash-table-ref/default res curr-section-name '()))
(envar (and environ-patt (string-match (regexp environ-patt) curr-section-name)))
(realval (if envar
(config:eval-string-in-environment val)
val)))
(if envar
(begin
(debug:print 4 "INFO: read-config key=" key ", val=" val ", realval=" realval)
(setenv key realval)))
(hash-table-set! res curr-section-name
(config:assoc-safe-add alist key realval))
(loop (read-line inp) curr-section-name key #f)))
(loop (configf:read-line inp) curr-section-name key #f)))
;; if a continued line
(configf:cont-ln-rx ( x whsp val ) (let ((alist (hash-table-ref/default res curr-section-name '())))
(if var-flag ;; if set to a string then we have a continued var
(let ((newval (conc
(config-lookup res curr-section-name var-flag) "\n"
;; trim lead from the incoming whsp to support some indenting.
(if lead
(string-substitute (regexp lead) "" whsp)
"")
val)))
;; (print "val: " val "\nnewval: \"" newval "\"\nvarflag: " var-flag)
(hash-table-set! res curr-section-name
(config:assoc-safe-add alist var-flag newval))
(loop (read-line inp) curr-section-name var-flag (if lead lead whsp)))
(loop (read-line inp) curr-section-name #f #f))))
(loop (configf:read-line inp) curr-section-name var-flag (if lead lead whsp)))
(loop (configf:read-line inp) curr-section-name #f #f))))
(else (debug:print 0 "ERROR: problem parsing " path ",\n \"" inl "\"")
(set! var-flag #f)
(loop (read-line inp) curr-section-name #f #f))))))))
(loop (configf:read-line inp) curr-section-name #f #f))))))))
(define (find-and-read-config fname #!key (environ-patt #f))
(let* ((curr-dir (current-directory))
(configinfo (find-config fname))
(toppath (car configinfo))
(configfile (cadr configinfo)))
(if toppath (change-directory toppath))
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