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Add HIDE / UNHIDE commands, to toggle the access "invisible" bit

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This is used by the GS/OS Finder to conceal FINDER.DATA files.
Documented in "Exploring GS/OS and ProDOS 8" by Gary B. Little.
BASIC.SYSTEM's CAT/CATALOG are unaware of this, so the files are still
listed.

Note that the command is named "UNHIDE" rather than "SHOW" as that
sounds like a command to display file contents or something.
This commit is contained in:
Joshua Bell 2023-05-11 09:37:00 -06:00
parent 8cb8f98793
commit 4bdb0808a2
5 changed files with 146 additions and 0 deletions
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2
COMMANDS
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@ -11,3 +11,5 @@ mem
online
type
touch
hide
unhide

1
README.md
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@ -55,6 +55,7 @@ Sample commands included:
* `S` and `D` arguments can be used to specify slot and drive.
* `BELL` - emits the standard Apple II beep
* `BUZZ` - emits the ProDOS "nice little tone"
* `HIDE` / `UNHIDE` - sets / clears the "invisible" bit on a file, used in GS/OS Finder
## Instructions For Developers

68
hide.cmd.s Normal file
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@ -0,0 +1,68 @@
;;; ============================================================
;;;
;;; HIDE - Mark a file as invisible
;;;
;;; Usage: HIDE filename[,S#][,D#]
;;;
;;; * filename can be relative or absolute path
;;;
;;; ============================================================
.include "apple2.inc"
.include "more_apple2.inc"
.include "prodos.inc"
;;; ============================================================
.org $4000
;; NOTE: Assumes XLEN is set by PATH
;; Point BI's parser at the command execution routine.
lda #<execute
sta XTRNADDR
lda #>execute
sta XTRNADDR+1
;; Mark command as external (zero).
lda #0
sta XCNUM
;; Set accepted parameter flags
;; Filename
lda #PBitsFlags::FN1
sta PBITS
;; Slot & Drive handling
lda #PBitsFlags::SD
sta PBITS+1
clc ; Success (so far)
rts1: rts ; Return to BASIC.SYSTEM
;;; ============================================================
execute:
;; Get the existing file info
lda #$A
sta SSGINFO
lda #GET_FILE_INFO
jsr GOSYSTEM
bcs rts1
;;; --------------------------------------------------
;; Clear invisible bit
lda FIACESS
ora #ACCESS_I
sta FIACESS
;; Set new file info
lda #$7
sta SSGINFO
lda #SET_FILE_INFO
jmp GOSYSTEM
;;; --------------------------------------------------

7
prodos.inc
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@ -33,6 +33,13 @@ FT_DIR = $0F
FT_CMD = $F0
FT_BAS = $FC
ACCESS_D = %10000000 ; Access: Destroy-Enable
ACCESS_RN = %01000000 ; Access: Rename-Enable
ACCESS_B = %00100000 ; Access: Backup
ACCESS_I = %00000100 ; Access: Invisible
ACCESS_W = %00000010 ; Access: Write-Enable
ACCESS_R = %00000001 ; Access: Read-Enable
;;; ============================================================
;;; BASIC.SYSTEM Global Page

68
unhide.cmd.s Normal file
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@ -0,0 +1,68 @@
;;; ============================================================
;;;
;;; UNHIDE - Mark a file as not invisible
;;;
;;; Usage: UNHIDE filename[,S#][,D#]
;;;
;;; * filename can be relative or absolute path
;;;
;;; ============================================================
.include "apple2.inc"
.include "more_apple2.inc"
.include "prodos.inc"
;;; ============================================================
.org $4000
;; NOTE: Assumes XLEN is set by PATH
;; Point BI's parser at the command execution routine.
lda #<execute
sta XTRNADDR
lda #>execute
sta XTRNADDR+1
;; Mark command as external (zero).
lda #0
sta XCNUM
;; Set accepted parameter flags
;; Filename
lda #PBitsFlags::FN1
sta PBITS
;; Slot & Drive handling
lda #PBitsFlags::SD
sta PBITS+1
clc ; Success (so far)
rts1: rts ; Return to BASIC.SYSTEM
;;; ============================================================
execute:
;; Get the existing file info
lda #$A
sta SSGINFO
lda #GET_FILE_INFO
jsr GOSYSTEM
bcs rts1
;;; --------------------------------------------------
;; Set invisible bit
lda FIACESS
and #<(~ACCESS_I)
sta FIACESS
;; Set new file info
lda #$7
sta SSGINFO
lda #SET_FILE_INFO
jmp GOSYSTEM
;;; --------------------------------------------------