--- gforth/history.fs	1995/04/30 23:18:21	1.5
+++ gforth/history.fs	2006/02/19 15:13:38	1.45
@@ -1,119 +1,317 @@
-\ History file support                                 16oct94py
+\ command line edit and history support                 16oct94py
 
-0 Value history
+\ Copyright (C) 1995,2000,2003,2004,2005 Free Software Foundation, Inc.
 
-2Variable forward^
-2Variable backward^
-2Variable end^
+\ This file is part of Gforth.
+
+\ Gforth is free software; you can redistribute it and/or
+\ modify it under the terms of the GNU General Public License
+\ as published by the Free Software Foundation; either version 2
+\ of the License, or (at your option) any later version.
+
+\ This program is distributed in the hope that it will be useful,
+\ but WITHOUT ANY WARRANTY; without even the implied warranty of
+\ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+\ GNU General Public License for more details.
+
+\ You should have received a copy of the GNU General Public License
+\ along with this program; if not, write to the Free Software
+\ Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111, USA.
+
+:noname
+    char [char] @ - ;
+:noname
+    char [char] @ - postpone Literal ;
+interpret/compile: ctrl  ( "<char>" -- ctrl-code )
 
-: get-history ( addr len -- wid )
-  check-file-prefix drop
-  2dup r/w open-file 0<
-  IF  drop r/w create-file throw  ELSE  nip nip  THEN
-  to history
-  history file-size throw
-  2dup forward^ 2! 2dup backward^ 2! end^ 2! ;
+\ command line editing                                  16oct94py
 
-s" ~/gforth.history" get-history
+: >string  ( span addr pos1 -- span addr pos1 addr2 len )
+  over 3 pick 2 pick chars /string ;
 
-: history-cold  Defers 'cold
-  s" ~/gforth.history" get-history ;
+: bindkey ( xt key -- )  cells ctrlkeys + ! ;
+
+\ history support                                       16oct94py
+
+0 Value history \ history file fid
+
+2Variable forward^
+2Variable backward^
+2Variable end^
 
-' history-cold IS 'cold
+: force-open ( addr len -- fid )
+    2dup r/w open-file
+    IF
+	drop r/w create-file throw
+    ELSE
+	nip nip
+    THEN ;
+
+s" os-class" environment? [IF] s" unix" str= [ELSE] true [THEN] 
+[IF]
+: history-file ( -- addr u )
+    s" GFORTHHIST" getenv dup 0= IF
+	2drop s" ~/.gforth-history"
+    THEN ;
+[ELSE]
+
+: history-dir ( -- addr u )
+  s" TMP" getenv ?dup ?EXIT drop
+  s" TEMP" getenv ?dup ?EXIT drop
+  s" c:/" ;
+
+: history-file ( -- addr u )
+  s" GFORTHHIST" getenv ?dup ?EXIT
+  drop
+  history-dir pad place
+  s" /ghist.fs" pad +place pad count ;
+[THEN]
 
 \ moving in history file                               16oct94py
 
+defer back-restore ( u -- )
+' backspaces is back-restore
+
 : clear-line ( max span addr pos1 -- max addr )
-  backspaces over spaces swap backspaces ;
+  back-restore over spaces swap back-restore ;
+
+\ : clear-tib ( max span addr pos -- max 0 addr 0 false )
+\   clear-line 0 tuck dup ;
 
-: clear-tib ( max span addr pos -- max 0 addr 0 false )
-  clear-line 0 tuck dup ;
+: hist-pos    ( -- ud )  history file-position drop ( throw ) ;
+: hist-setpos ( ud -- )  history reposition-file drop ( throw ) ;
 
-: get-line ( max addr -- max span addr pos dpos )
-  history file-position throw  backward^ 2!
-  2dup swap history read-line throw drop
-  2dup type tuck
-  history file-position throw  forward^ 2! ;
+: get-line ( addr len -- len' flag )
+  swap history read-line throw ;
 
 : next-line  ( max span addr pos1 -- max span addr pos2 false )
   clear-line
-  forward^ 2@ history reposition-file throw
-  get-line  0 ;
+  forward^ 2@ 2dup hist-setpos backward^ 2!
+  2dup get-line drop
+  hist-pos  forward^ 2!
+  tuck 2dup type 0 ;
+
+: find-prev-line ( max addr -- max span addr pos2 )
+  backward^ 2@ forward^ 2!
+  over 2 + negate s>d backward^ 2@ d+ 0. dmax 2dup hist-setpos
+  BEGIN
+      backward^ 2!   2dup get-line  WHILE
+      hist-pos 2dup forward^ 2@ d<  WHILE
+      rot drop
+  REPEAT  2drop  THEN  tuck ;
 
 : prev-line  ( max span addr pos1 -- max span addr pos2 false )
-  clear-line over 2 + negate s>d backward^ 2@ d+ 0. dmax
-  2dup history reposition-file throw
-  BEGIN   2over swap history read-line throw  WHILE
-          >r history file-position throw
-	  2dup backward^ 2@ d<  WHILE  2swap 2drop rdrop
-  REPEAT  ELSE  >r history file-position throw  THEN
-  forward^ 2!  backward^ 2!  r> tuck 2dup type 0 ;
+    clear-line find-prev-line 2dup type 0 ;
 
-: ctrl  ( "<char>" -- ctrl-code )
-  char [char] @ - postpone Literal ; immediate
-
-Create lfpad #lf c,
+\ Create lfpad #lf c,
 
 : (enter)  ( max span addr pos1 -- max span addr pos2 true )
-  >r end^ 2@ history reposition-file throw
-  2dup swap history write-file throw
-  lfpad 1 history write-file throw
-  history file-position throw 2dup backward^ 2! end^ 2!
+  >r end^ 2@ hist-setpos
+  2dup swap history write-line drop ( throw ) \ don't worry about errors
+  hist-pos 2dup backward^ 2! end^ 2!
   r> (ret) ;
 
-\ some other key commands                              16oct94py
-
-: first-pos  ( max span addr pos1 -- max span addr 0 0 )
-  backspaces 0 0 ;
-: end-pos  ( max span addr pos1 -- max span addr span 0 )
-  type-rest 2drop over 0 ;
-
 : extract-word ( addr len -- addr' len' )  dup >r
   BEGIN  1- dup 0>=  WHILE  2dup + c@ bl =  UNTIL  THEN  1+
   tuck + r> rot - ;
 
 Create prefix-found  0 , 0 ,
 
+: sgn ( n -- -1/0/1 )
+ dup 0= IF EXIT THEN  0< 2* 1+ ;
+
+: capscomp  ( c_addr1 u c_addr2 -- n )
+ swap bounds
+ ?DO  dup c@ I c@ <>
+     IF  dup c@ toupper I c@ toupper =
+     ELSE  true  THEN  WHILE  1+  LOOP  drop 0
+ ELSE  c@ toupper I c@ toupper - unloop  THEN  sgn ;
+
 : word-lex ( nfa1 nfa2 -- -1/0/1 )
-  dup 0=  IF  2drop 1  EXIT  THEN
-  cell+ >r cell+ count $1F and
-  dup r@ c@ $1F and =
-  IF  r> char+ capscomp 0<=  EXIT  THEN
-  nip r> c@ $1F and < ;
-
-: search-prefix  ( addr len1 -- suffix len2 )  0 >r  context
-  BEGIN  BEGIN  dup @ over  cell - @ =  WHILE  cell -  REPEAT
-         dup >r -rot r> @ @
-         BEGIN  dup  WHILE  >r dup r@ cell+ c@ $1F and <=
-                IF  2dup r@ cell+ char+ capscomp  0=
-                    IF  r> dup r@ word-lex
-                        IF  dup prefix-found @ word-lex
-                            0>= IF  rdrop dup >r  THEN
-                        THEN >r
-                    THEN
-                THEN  r> @
-         REPEAT  drop rot cell -  dup vp u> 0=
-  UNTIL  drop r> dup prefix-found ! ?dup
-  IF    cell+ count $1F and rot /string rot drop
-  ELSE  2drop s" "  THEN  ;
-
-: tab-expand ( max span addr pos1 -- max span addr pos2 0 )
-  prefix-found cell+ @  0 ?DO  (del)  LOOP
-  2dup extract-word search-prefix
-  dup prefix-found @ 0<> - prefix-found cell+ !
-  bounds ?DO  I c@ (ins)  LOOP
-  prefix-found @ IF  bl (ins)  THEN  0 ;
+    dup 0=
+    IF
+	2drop 1  EXIT
+    THEN
+    name>string 2>r name>string
+    dup r@ =
+    IF
+	rdrop r> capscomp 0<= EXIT
+    THEN
+    r> <
+    nip rdrop ;
+
+: search-voc ( addr len nfa1 nfa2 -- addr len nfa3 )
+    >r
+    BEGIN
+	dup
+    WHILE
+	>r dup r@ name>string nip <=
+	IF
+	    2dup r@ name>string drop capscomp  0=
+	    IF
+		r> dup r@ word-lex
+		IF
+		    dup prefix-found @ word-lex
+		    0>=
+		    IF
+			rdrop dup >r
+		    THEN
+		THEN
+		>r
+	    THEN
+	THEN
+	r> @
+    REPEAT
+    drop r> ;
+
+: prefix-off ( -- )  0 0 prefix-found 2! ;
+
+: prefix-string ( addr len nfa -- addr' len' )
+    dup prefix-found !  ?dup
+    IF
+	name>string rot /string rot drop
+	dup 1+ prefix-found cell+ !
+    ELSE
+	2drop s" " prefix-off
+    THEN ;
+
+: search-prefix  ( addr1 len1 -- addr2 len2 )
+    0 vp dup @ 1- cells over +
+    DO  I 2@ <>
+        IF  I cell+ @ wordlist-id @ swap  search-voc  THEN
+	[ -1 cells ] Literal +LOOP
+    prefix-string ;
+
+: tib-full? ( max span addr pos addr' len' -- max span addr pos addr1 u flag )
+    5 pick over 4 pick + prefix-found @ 0<> - < ;
 
 : kill-prefix  ( key -- key )
-  dup #tab <> IF  0 0 prefix-found 2!  THEN ;
+  dup #tab <> IF  prefix-off  THEN ;
+
+\ UTF-8 support
+
+require utf-8.fs
+
+[IFUNDEF] #esc  27 Constant #esc  [THEN]
+
+: save-cursor ( -- )  #esc emit '7 emit ;
+: restore-cursor ( -- )  #esc emit '8 emit ;
+: .rest ( addr pos1 -- addr pos1 )
+    restore-cursor 2dup type ;
+: .all ( span addr pos1 -- span addr pos1 )
+    restore-cursor >r 2dup swap type r> ;
+: xback-restore ( u -- )
+    drop restore-cursor ;
+
+\ In the following, addr max is the buffer, addr span is the current
+\ string in the buffer, and pos1 is the cursor position in the buffer.
+
+: <xins>  ( max span addr pos1 xc -- max span addr pos2 )
+    >r  2over r@ xc-size + u< IF  ( max span addr pos1 R:xc )
+	rdrop bell  EXIT  THEN
+    >string over r@ xc-size + swap move
+    2dup chars + r@ swap r@ xc-size xc!+? 2drop drop
+    r> xc-size >r  rot r@ chars + -rot r> chars + ;
+: (xins)  ( max span addr pos1 xc -- max span addr pos2 )
+    <xins> .all .rest ;
+: xback  ( max span addr pos1 -- max span addr pos2 f )
+    dup  IF  over + xchar- over -  0 max .all .rest
+    ELSE  bell  THEN 0 ;
+: xforw  ( max span addr pos1 -- max span addr pos2 f )
+    2 pick over <> IF  over + xc@+ xemit over -  ELSE  bell  THEN 0 ;
+: (xdel)  ( max span addr pos1 -- max span addr pos2 )
+    over + dup xchar- tuck - >r over -
+    >string over r@ + -rot move
+    rot r> - -rot ;
+: ?xdel ( max span addr pos1 -- max span addr pos2 0 )
+  dup  IF  (xdel) .all 2 spaces .rest  THEN  0 ;
+: <xdel> ( max span addr pos1 -- max span addr pos2 0 )
+  2 pick over <>
+    IF  xforw drop (xdel) .all 2 spaces .rest
+    ELSE  bell  THEN  0 ;
+: xeof  2 pick over or 0=  IF  bye  ELSE  <xdel>  THEN ;
+
+: xfirst-pos  ( max span addr pos1 -- max span addr 0 0 )
+  drop 0 .all .rest 0 ;
+: xend-pos  ( max span addr pos1 -- max span addr span 0 )
+  drop over .all 0 ;
+
+
+: xclear-line ( max span addr pos1 -- max addr )
+    drop restore-cursor swap spaces restore-cursor ;
+: xclear-tib ( max span addr pos -- max 0 addr 0 false )
+    xclear-line 0 tuck dup ;
+
+: (xenter)  ( max span addr pos1 -- max span addr pos2 true )
+    >r end^ 2@ hist-setpos
+    2dup swap history write-line drop ( throw ) \ don't worry about errors
+    hist-pos 2dup backward^ 2! end^ 2!
+    r> .all space true ;
+
+: xkill-expand ( max span addr pos1 -- max span addr pos2 )
+    prefix-found cell+ @ ?dup IF  >r
+	r@ - >string over r@ + -rot move
+	rot r@ - -rot .all r> spaces .rest THEN ;
+
+: insert   ( string length buffer size -- )
+    rot over min >r  r@ - ( left over )
+    over dup r@ +  rot move   r> move  ;
+
+: xtab-expand ( max span addr pos1 -- max span addr pos2 0 )
+    key? IF  #tab (xins) 0  EXIT  THEN
+    xkill-expand 2dup extract-word dup 0= IF  nip EXIT  THEN
+    search-prefix tib-full?
+    IF    bell  2drop  prefix-off
+    ELSE  dup >r
+	2>r >string r@ + 2r> 2swap insert
+	r@ + rot r> + -rot
+    THEN
+    prefix-found @ IF  bl (xins)  ELSE  .all .rest  THEN  0 ;
+
+: xchar-history ( -- )
+    ['] xforw        ctrl F bindkey
+    ['] xback        ctrl B bindkey
+    ['] ?xdel        ctrl H bindkey
+    ['] xeof         ctrl D bindkey
+    ['] <xdel>       ctrl X bindkey
+    ['] xclear-tib   ctrl K bindkey
+    ['] xfirst-pos   ctrl A bindkey
+    ['] xend-pos     ctrl E bindkey
+    ['] (xenter)     #lf    bindkey
+    ['] (xenter)     #cr    bindkey
+    ['] xtab-expand  #tab   bindkey
+    ['] (xins)       IS insert-char
+    ['] kill-prefix  IS everychar
+    ['] save-cursor  IS everyline
+    ['] xback-restore IS back-restore
+;
+
+xchar-history
+
+\ initializing history
+
+: get-history ( addr len -- )
+    ['] force-open catch
+    ?dup-if
+	\ !! >stderr
+        \ history-file type ." : " .error cr
+	drop 2drop
+	['] false ['] false ['] (ret)
+    else
+	to history
+	history file-size throw
+	2dup forward^ 2! 2dup backward^ 2! end^ 2!
+	['] next-line ['] prev-line ['] (enter)
+    endif
+    dup #lf bindkey
+        #cr bindkey
+     ctrl P bindkey
+     ctrl N bindkey
+;
+
+: history-cold ( -- )
+    history-file get-history xchar-history ;
 
-' kill-prefix IS everychar
+' history-cold INIT8 chained
+history-cold
 
-' next-line  ctrl N cells ctrlkeys + !
-' prev-line  ctrl P cells ctrlkeys + !
-' clear-tib  ctrl K cells ctrlkeys + !
-' first-pos  ctrl A cells ctrlkeys + !
-' end-pos    ctrl E cells ctrlkeys + !
-' (enter)    #lf    cells ctrlkeys + !
-' (enter)    #cr    cells ctrlkeys + !
-' tab-expand #tab   cells ctrlkeys + !