;;======================================================================
;; Copyright 2006-2011, Matthew Welland.
;;
;; This program is made available under the GNU GPL version 2.0 or
;; greater. See the accompanying file COPYING for details.
;;
;; This program is distributed WITHOUT ANY WARRANTY; without even the
;; implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
;; PURPOSE.
;;======================================================================
;;======================================================================
;; Config file handling
;;======================================================================
(use regex regex-case)
(declare (unit configf))
(declare (uses common))
(declare (uses process))
(include "common_records.scm")
;; return list (path fullpath configname)
(define (find-config configname)
(let* ((cwd (string-split (current-directory) "/")))
(let loop ((dir cwd))
(let* ((path (conc "/" (string-intersperse dir "/")))
(fullpath (conc path "/" configname)))
(if (file-exists? fullpath)
(list path fullpath configname)
(let ((remcwd (take dir (- (length dir) 1))))
(if (null? remcwd)
(list #f #f #f) ;; #f #f)
(loop remcwd))))))))
(define (config:assoc-safe-add alist key val)
(let ((newalist (filter (lambda (x)(not (equal? key (car x)))) alist)))
(append newalist (list (list key val)))))
;; read a config file, returns two level hierarchial hash-table,
;; adds to ht if given (must be #f otherwise)
(define (read-config path ht allow-system)
(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))
(include-rx (regexp "^\\[include\\s+(.*)\\]\\s*$"))
(section-rx (regexp "^\\[(.*)\\]\\s*$"))
(blank-l-rx (regexp "^\\s*$"))
(key-sys-pr (regexp "^(\\S+)\\s+\\[system\\s+(\\S+.*)\\]\\s*$"))
(key-val-pr (regexp "^(\\S+)\\s+(.*)$"))
(comment-rx (regexp "^\\s*#.*"))
(cont-ln-rx (regexp "^(\\s+)(\\S+.*)$")))
(let loop ((inl (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
(comment-rx _ (loop (read-line inp) curr-section-name #f #f))
(blank-l-rx _ (loop (read-line inp) curr-section-name #f #f))
(include-rx ( x include-file ) (begin
(read-config include-file res allow-system)
(loop (read-line inp) curr-section-name #f #f)))
(section-rx ( x section-name ) (loop (read-line inp) section-name #f #f))
(key-sys-pr ( x key cmd ) (if allow-system
(let ((alist (hash-table-ref/default res curr-section-name '()))
(val (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 val))
(loop (read-line inp) curr-section-name #f #f))
(loop (read-line inp) curr-section-name #f #f)))
(key-val-pr ( x key val ) (let ((alist (hash-table-ref/default res curr-section-name '())))
(hash-table-set! res curr-section-name
(config:assoc-safe-add alist key val))
(loop (read-line inp) curr-section-name key #f)))
;; if a continued line
(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))))
(else (debug:print 0 "ERROR: problem parsing " path ",\n \"" inl "\"")
(set! var-flag #f)
(loop (read-line inp) curr-section-name #f #f))))))))
(define (find-and-read-config fname)
(let* ((curr-dir (current-directory))
(configinfo (find-config fname))
(toppath (car configinfo))
(configfile (cadr configinfo)))
(if toppath (change-directory toppath))
(let ((configdat (if configfile (read-config configfile #f #t) #f))) ;; (make-hash-table))))
(if toppath (change-directory curr-dir))
(list configdat toppath configfile fname))))
(define (config-lookup cfgdat section var)
(let ((sectdat (hash-table-ref/default cfgdat section '())))
(if (null? sectdat)
#f
(let ((match (assoc var sectdat)))
(if match
(cadr match)
#f))
)))
(define (setup)
(let* ((configf (find-config))
(config (if configf (read-config configf #f #t) #f)))
(if config
(setenv "RUN_AREA_HOME" (pathname-directory configf)))
config))