wip search is kind of working

femto.tal

@@ -47,7 +47,6 @@
 ( - search )
 ( - search&replace )
 ( - windows line-ending support (CRLF) )
-( - consider using abssolute cursor positions )
 
 |00 @System     [ &vector $2 &wst  $1 &rst    $1 &pad   $4 &r $2 &g $2 &b $2   &debug $1 &halt $1 ]
 |10 @Console    [ &vector $2 &read $1 &pad    $5 &write $1 &error  $1 ]
@@ -134,6 +133,13 @@
     &data $40       ( small scratch pad when reading data )
 ]
 
+( search uses .tmp/pos and .tmp/data to track query string )
+@searching [
+    &active $1
+    &orig-row $2
+    &orig-col $2
+]
+
 ( startup )
 |0100
     ;init-zero-page JSR2
@@ -588,6 +594,17 @@
         .state/quitting LDZ ;quit-now JCN2
         BRK
 
+@search ( -> )
+    ;messages/search-prompt ;messages/null ;do-search ;start-prompt JSR2
+    ;draw-prompt-and-cursor JSR2
+    BRK
+
+@do-search ( -> )
+    #01 .searching/active STZ
+    ;draw-all JSR2
+    ( ;move-to-next-match JMP2 )
+    BRK
+
 @toggle-color ( -> )
     .config/color LDZ2 #3733 EQU2 ,&wrap-around JCN
     .config/color LDZ2 #0100 ADD2 .config/color STZ2 ,&done JMP
@@ -660,6 +677,26 @@
     ;clear-line JSR2
     JMP2r
 
+@cancel-search
+    #00 .searching/active STZ
+    ;draw-all JSR2
+    BRK
+
+@finish-search
+    #00 .searching/active STZ
+    ;draw-all JSR2
+    BRK
+
+@move-to-next-match BRK
+@move-to-prev-match BRK
+
+@on-key-searching
+    .Console/read DEI #07 EQU ( C-g ) ;cancel-search JCN2
+    .Console/read DEI #0d EQU ( \r  ) ;finish-search JCN2
+    .Console/read DEI #6e EQU ( n ) ;move-to-next-match JCN2
+    .Console/read DEI #70 EQU ( p ) ;move-to-prev-match JCN2
+    ;ignore JMP2
+
 @on-key-prompt
     .Console/read DEI #07 EQU ( C-g ) ;cancel-prompt JCN2
     .Console/read DEI #0d EQU ( \r  ) ;finish-prompt JCN2
@@ -674,6 +711,7 @@
 ( TODO: tab input? )
 @on-key
     ;clear-message-line JSR2
+    .searching/active LDZ ;on-key-searching JCN2
     .prompt/active LDZ ;on-key-prompt JCN2
     .state/saw-vt LDZ ;on-key-vt JCN2
     .state/saw-xterm LDZ ;on-key-xterm JCN2
@@ -689,6 +727,7 @@
     .Console/read DEI #0e EQU ( C-n ) ;down JCN2
     .Console/read DEI #0f EQU ( C-o ) ;save JCN2
     .Console/read DEI #10 EQU ( C-p ) ;up JCN2
+    .Console/read DEI #13 EQU ( C-s ) ;search JCN2
     .Console/read DEI #16 EQU ( C-v ) ;page-down JCN2
     .Console/read DEI #18 EQU ( C-x ) ;quit JCN2
     .Console/read DEI #1a EQU ( C-z ) ;debug JCN2
@@ -805,6 +844,79 @@
     ;emit-dec2-pad JSR2
     ansi ( LIT2 'm '0 emit emit ) emit-0 emit-m JMP2r
 
+@matches-at ( s* -> limit* )
+    LIT2r :tmp/data
+    &loop
+        LDAkr STHr ,&non-zero JCN ,&done JMP
+    &non-zero
+        LDAk LDAkr STHr NEQ ,&fail JCN
+        INC2 INC2r ,&loop JMP
+    &done
+        POP2r JMP2r
+    &fail
+        POP2r POP2 #0000 JMP2r
+
+@draw-region ( offset* limit* col* row* -> )
+    OVR2 ( offset limit col row col )
+    .term/cols LDZ2 SWP2 SUB2 STH2 ( offset limit col row [cols-col] )
+    ;term-move-cursor JSR2 ( offset limit [cols-col] )
+    OVR2 STH2r ADD2 ( offset limit offset+cols-col )
+    ;min2 JSR2 STH2 ( offset [cutoff] )
+    &loop ( i [cutoff] )
+        DUP2 STH2kr LTH2 ,&continue JCN ,&done JMP
+    &continue ( i [cutoff] )
+        LDAk #00 EQU ,&done JCN
+        LDAk #18 DEO INC2 ,&loop JMP        
+    &done
+        POP2 POP2r JMP2r
+
+@screen-limit ( -> sc-limit* )
+    .term/rows LDZ2 .buffer/line-offset LDZ2 ADD2 ( row0+rows )
+    DUP2 .buffer/line-count LDZ2 LTH2 ,&not-end JCN
+        POP2 .buffer/limit LDZ2 JMP2r
+    &not-end
+        ;abs-line JMP2
+
+@draw-matches ( -> )
+    ( return if not searching )
+    .searching/active LDZ #00 EQU ,&return JCN ( )
+    ;emit-color-reverse JSR2
+
+    .term/lmargin LDZ2 ( #0000 ) ,&x STR2 #0000 ,&y STR2 ( x <- 0, y <- 0 )
+
+    .buffer/offset LDZ2 DUP2
+    ;screen-limit JSR2 SUB2 STH2 ( offset [-count] )
+
+    &loop ( offset [-count] )
+        STH2kr #0000 EQU2 ,&done JCN
+        DUP2 ;matches-at JSR2 ( offset mlim [-count] )
+        DUP2 ORA ,&found JCN
+        POP2 ( offset [-count] )
+        LDAk #0a EQU ,&newline JCN
+        #0001 ,&next JMP ( offset n [-count] )
+    &found ( offset mlim [-count] )
+        STH2k ( offset mlim [mlim -count] )
+        OVR2 SWP2 ,&x LDR2 ,&y LDR2 ( offset offset mlim x y [mlim -count] )
+        ;draw-region JSR2 ( offset [mlim -count] ) ( POP2 POP2 POP2 POP2 ( FIXME ) )
+        STH2r ( offset mlim [-count] )
+        OVR2 SUB2 ( offset mlim-offset [-count] )
+    &next ( offset n [-count] )
+        DUP2 ,&x LDR2 ADD2 ,&x STR2 ( offset n [-count )
+        STH2k ( offset n [n -count] )
+        ADD2 ADD2r ( offset+n [n-count] )
+        ,&loop JMP
+    &newline ( offset [-count] )
+        .term/lmargin LDZ2 ( #0000 ) ,&x STR2
+        ,&y LDR2 INC2 ,&y STR2
+        INC2 INC2r
+        ,&loop JMP
+    &done
+        POP2 POP2r
+        ;emit-reset JSR2
+    &return
+        JMP2r
+    [ &x $2 &y $2 ]
+
 @emit-tab ( -> )
     #0000 .config/tab-width LDZ2 SUB2
     LIT2r 2018
@@ -868,6 +980,7 @@
         ,&eof-loop JMP
     &done POP2 POP2r POP2r
     ;emit-reset JSR2
+    ;draw-matches JSR2
     ;draw-statusbar JSR2
     ;draw-prompt-and-cursor JSR2
     JMP2r
@@ -1094,6 +1207,7 @@
             &lines 20 "lines] 00
             &goto-line "Go 20 "to 20 "line: 20 00
             &save-prompt "File 20 "Name 20 "to 20 "Write: 20 00
+            &search-prompt "Text 20 "to 20 "Search 20 "for: 20 00
             &quit-prompt "Save 20 "modified 20 "file 20 "(y/n)? 20 00
             &unknown-input "Unknown 20 "input: 20 00
             &saved "-- 20 00