pitch-dark/src/prefs.a

;license:MIT
;(c) 2018 by 4am
;
; Global and per-game preferences
;
; Public functions
; - LoadGlobalPreferences
;
; Public variables
; - gForce40              byte       0=false, 1=true
; - gForceUpper           byte       0=false, 1=true
; - gSort                 byte       0=name, 1=year, 2=genre, 3=difficulty
; - gCurrentGame          byte       0..kNumberOfGames-1
; - gVersions[]           array of fixed length records, each 16 bytes

!zone {
TRUE                      = 1
FALSE                     = 0
kDefaultGame              = 30       ; Zork I

; global storage for parsed preference values
gForce40
         !byte 0
gForceUpper
         !byte 0
gSort
         !byte 0
gCurrentGame
         !byte 0
gVersions
         !fill kNumberOfGames*16,0

;------------------------------------------------------------------------------
; LoadGlobalPreferences
;
; in:    current ProDOS prefix is the same as the PITCH.DARK binary
; out:   all registers and flags clobbered
;------------------------------------------------------------------------------
LoadGlobalPreferences
; set defaults first in case prefs file is missing or incomplete
         lda   #FALSE
         sta   gForce40
         lda   #FALSE
         sta   gForceUpper
         lda   #0
         sta   gSort
         lda   #kDefaultGame
         sta   gCurrentGame

         bra   .exit
         ; TODO
         jsr   LoadFile              ; load prefs file at $2000
         !word .globalPrefsFilename
         !word $2000
         !word $2000
         !word kProDOSFileBuffer
         bcs   .exit
.exit
         rts

SaveGlobalPreferences
         ; TODO
         rts

.globalPrefsFilename
         !byte 15
         !raw  "PITCH.DARK.CONF"

.globalPrefsKeys
         !word .force40
         !word .forceupper
         !word .sort
         !word .lastplayed
.force40
         !byte 14
         !raw  "FORCE40COLUMNS"
.forceupper
         !byte 14
         !raw  "FORCEUPPERCASE"
.sort
         !byte 4
         !raw  "SORT"
.lastplayed
         !byte 10
         !raw  "LASTPLAYED"
}