VE: Improve I and F buffer typing

Previously, it would keep the old buffer displayed why typing over
it. I had kept it thus because I didn't want to erase the buffer
right away because the behavior is that when we type nothing, we
keep the buffer as-is and repeat the action.

Now, the behavior of I and F is much better. It keeps the buffer
displayed until the first non-return keystroke and then erases it.

Also, fixed PSP leak in _type and fixed PSP overuse in successful
_F (they balanced out).

blk/105

@@ -1,8 +1,6 @@
 : _type ( buf -- )
-    C< DUP 0xd = IF 2DROP EXIT THEN OVER DUP _zbuf ( c a )
-    BEGIN ( c a )
-        C!+ C< SWAP
-    OVER 0x0d = UNTIL ( c a ) C! ;
+    C< DUP 0xd = IF 2DROP EXIT THEN SWAP DUP _zbuf ( c a )
+    BEGIN ( c a ) C!+ C< TUCK 0x0d = UNTIL ( c a ) C! ;
 ( user-facing lines are 1-based )
 : T 1- DUP 64 * EDPOS ! _pln ;
 : P IBUF _type IBUF EDPOS @ _cpos 64 MOVE BLK!! ;

blk/107

@@ -1,10 +1,10 @@
-: _F ( F without _pln. used in VE )
-    FBUF _type FBUF EDPOS @ _cpos ( a1 a2 )
+: _F ( F without _type and _pln. used in VE )
+    FBUF EDPOS @ _cpos ( a1 a2 )
     BEGIN
         C@+ ROT ( a2+1 c2 a1 ) C@+ ROT ( a2+1 a1+1 c1 c2 )
-        = NOT IF DROP FBUF THEN
+        = NOT IF DROP FBUF THEN ( a2 a1 )
         TUCK C@ 0xd = ( a1 a2 f1 )
         OVER BLK) = OR ( a1 a2 f1|f2 )
-    UNTIL
-    DUP BLK) < IF BLK( - FBUF + -^ EDPOS ! THEN DROP ;
-: F _F EDPOS @ 64 / _pln ;
+    UNTIL ( a1 a2 )
+    DUP BLK) < IF BLK( - FBUF + -^ EDPOS ! ELSE DROP THEN ;
+: F FBUF _type _F EDPOS @ 64 / _pln ;

blk/108

@@ -3,8 +3,8 @@
 : _rbufsz ( size of linebuf to the right of curpos )
     EDPOS @ 64 MOD 63 -^ ;
 : i COMPILE I ; IMMEDIATE ( save overshadowed )
-: _I ( I without _pln. used in VE )
-    IBUF _type _rbufsz IBUF _blen 2DUP > IF
+: _I ( I without _pln and _type. used in VE )
+    _rbufsz IBUF _blen 2DUP > IF
         TUCK - ( ilen chars-to-move )
         SWAP EDPOS @ _cpos 2DUP + ( ctm ilen a a+ilen )
         3 PICK MOVE- ( ctm ilen )
@@ -12,4 +12,4 @@
     ELSE DROP ( ilen becomes rbuffsize )
     THEN
     DUP IBUF EDPOS @ _cpos ROT MOVE ( ilen ) EDPOS +! BLK!! ;
-: I _I EDPOS @ 64 / _pln ;
+: I IBUF _type _I EDPOS @ 64 / _pln ;

blk/127

@@ -3,3 +3,8 @@
 : setpos ( -- ) EDPOS @ 64 /MOD
     3 + ( header ) SWAP 3 + ( gutter ) SWAP AT-XY ;
 : cmv ( n -- , char movement ) acc@ * EDPOS @ + pos! ;
+: buftype ( buf ln -- )
+    3 OVER AT-XY C< DUP 0xd = IF 2DROP DROP EXIT THEN
+    ( buf ln c ) 63 nspcs SWAP 4 SWAP AT-XY ( buf c )
+    SWAP DUP _zbuf BEGIN ( c a )
+        C!+ C< TUCK 0x0d = UNTIL ( c a ) C! ;

blk/128

@@ -2,8 +2,8 @@
 : $g ACC @ selblk 0acc ;
 : $[ BLK> @ acc@ - selblk ;
 : $] BLK> @ acc@ + selblk ;
-: $I mode! 'I' EMIT 3 1 AT-XY _I contents mode! SPC ;
-: $F mode! 'F' EMIT 3 2 AT-XY _F setpos mode! SPC ;
+: $I mode! 'I' EMIT IBUF 1 buftype _I contents mode! SPC ;
+: $F mode! 'F' EMIT FBUF 2 buftype _F setpos mode! SPC ;
 : $E E contents ;
 : $X acc@ X contents ;
 : $h -1 cmv ; : $l 1 cmv ; : $k -64 cmv ; : $j 64 cmv ;