enable command line to properly process quoted string arguments

src/compatibility/_ResetAndBuildVAT.asm

@@ -6,18 +6,22 @@ _ResetAndBuildVAT:
 	call _BuildVAT
 	ld hl,(ti.pTemp)
 	push hl
-	ld hl,'A' shl 8
+	ld hl,'A' shl 8 ; letter variables
 	ld (ti.OP1),hl
 .realvariableloop:
 	ld hl,9
 	call _CreateVar.entryOP1
 	ld a,(ti.OP1+1)
-	cp a,'Z'
+	cp a,'Z'+1 ; create up until theta (letter after Z in TI-BASIC tokens)
 	jr z,.donereals
 	inc a
 	ld (ti.OP1+1),a
 	jr .realvariableloop
 .donereals:
+	ld hl,$72 shl 8 ; Ans
+	ld (ti.OP1),hl
+	ld hl,9
+	call _CreateVar.entryOP1 ; create Ans variable
 	ld hl,(ti.pTemp)
 	ld (ti.OPBase),hl
 	pop hl

src/data/adrive/src/fs/bin/cmd.asm

@@ -440,6 +440,8 @@ cmd_exit:
 	pop ix
 	ret
 
+; input hl pointer to line
+; output hl pointer to character following EOL, replacing the EOL with NULL
 cmd_terminate_line:
 	xor a,a
 	ld (ix-20),a
@@ -452,6 +454,8 @@ cmd_terminate_line:
 	jr z,.eol
 	cp a,$A
 	jr z,.eol
+	; cp a,'>'
+	; jr z,.eol
 	inc hl
 	cp a,$5C ;backslash
 	jr nz,.loop
@@ -468,6 +472,8 @@ cmd_get_arguments.inc_twice:
 	inc hl
 cmd_get_arguments.loop:
 	inc hl
+; input hl pointer to first char of argument string
+; output hl pointer to character following EOL, replacing spaces (outside of quotes) with NULL
 cmd_get_arguments:
 	ld a,(hl)
 	or a,a
@@ -476,34 +482,53 @@ cmd_get_arguments:
 	ret z
 	cp a,$A
 	ret z
-	cp a,$5C ;backslash
+	cp a,'"'
+	jr z,.process_quotes
+	cp a,$27 ; single quote
+	jr z,.process_quotes
+	cp a,$5C ; backslash
 	jr z,.inc_twice
 	cp a,' '
 	jr nz,.loop
 	ld (hl),0
+.done:
 	inc hl
 	ret
 
-cmd_config_data_struct:
-	db "BTBG", 0
-	dl bos.lcd_text_bg
-	db "BTFG", 0
-	dl bos.lcd_text_fg
-	db "BTFG2", 0
-	dl bos.lcd_text_fg2
-	db "BBGC", 0
-	dl bos.lcd_bg_color
-	db 0
+.process_quotes:
+	ld c,a
+	dec hl
+.process_quotes_loop:
+	inc hl
+	ld a,(hl)
+	or a,a
+	jr z,.done
+	cp a,$5C ; backslash
+	jr z,.process_quotes_loop ; handle escaped characters
+	cp a,c
+	jr nz,.process_quotes_loop
+	jr .loop
+
+; cmd_config_data_struct:
+	; db "BTBG", 0
+	; dl bos.lcd_text_bg
+	; db "BTFG", 0
+	; dl bos.lcd_text_fg
+	; db "BTFG2", 0
+	; dl bos.lcd_text_fg2
+	; db "BBGC", 0
+	; dl bos.lcd_bg_color
+	; db 0
 
 cmd_help_info:
 	db " cmd cmds",$A,$9,"run command(s) but exit if one returns an error",$A
 	db " cmd -a cmds",$A,$9,"run all commands(s) regardless of error codes",$A
 	db " cmd -i cmds",$A,$9,"run commands(s), ignoring all errors",$A
 	db " cmd -x file",$A,$9,"run a command file",$A,0
 
-str_system_path:
-	db "/bin/"
-.len:=$-.
+; str_system_path:
+	; db "/bin/"
+; .len:=$-.
 str_ProgramFailedWithCode:
 	db "Error Code ",0
 str_CouldNotLocateExecutable: