From 45a305640650654899da2d47e761ad9bc09940a7 Mon Sep 17 00:00:00 2001
From: d6 <d_m@plastic-idolatry.com>
Date: Tue, 15 Feb 2022 21:19:44 -0500
Subject: [PATCH] very basic save support + docs

---
 femto.tal | 59 +++++++++++++++++++++++++++----------------------------
 1 file changed, 29 insertions(+), 30 deletions(-)

diff --git a/femto.tal b/femto.tal
index aec590c..8a6aed7 100644
--- a/femto.tal
+++ b/femto.tal
@@ -37,13 +37,9 @@
 (     blue, magenta, cyan, white             )
 
 ( TODO: )
-( - set up term scrolling at start )
 ( - optimize term drawing )
 ( - get long line truncation/scrolling working )
-( - unify insertion/overwrite code )
-( - display cursor coords )
 ( - page up/page down )
-( - jump to end of buffer )
 ( - line numbers in left column (toggle mode?) )
 ( - help text )
 ( - save file command -> tmp first )
@@ -55,6 +51,10 @@
 ( - tab support? )
 ( - windows line-ending support (CRLF) )
 
+( FIXME: )
+( - stop using bytes for row/col/etc. )
+( - consider storing absolute cursor instead )
+
 |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 ]
 |a0 @File       [ &vector $2 &success $2 &stat $2 &delete $1 &append $1 &name $2 &length $2 &read $2 &write $2 ]
@@ -134,7 +134,6 @@
         LDAk LIT '0 SUB #00 SWP STH2 ADD2r
         INC2 ,&loop JMP
     &parse-col
-(        INC2 STH2r ;term/rows STA2 )
         INC2 STH2r #0002 SUB2 ;term/rows STA2
     &loop2
         LDAk LIT 'R EQU ,&done JCN
@@ -181,7 +180,6 @@
     ;setup-terminal-size JSR2          ( detect terminal dimensions )
     BRK
 
-
 @bol
     #00 ;cursor/col STA
     ;draw-statusbar JSR2
@@ -214,7 +212,6 @@
     ;draw-cursor JSR2
     &skip BRK
 
-( TODO: integrate ensure-visible-cursor to move by half-screens )
 @up
     ;cur-line-num JSR2 #0000 EQU2 ,&done JCN
     ;cursor/row LDA #01 LTH ,&screen-up JCN
@@ -227,7 +224,6 @@
     ;draw-all JSR2
     &done BRK
 
-( FIXME: need to handle 'end of buffer' stuff )
 @down
     ;cur-abs-row JSR2 ;last-abs-row JSR2 EQU2 ,&done JCN
     ;cursor/row LDA INC ;cursor/row STA
@@ -246,19 +242,13 @@
     ;draw-all JSR2
     BRK
 
-( @overwrite ( c^ -> )
-    ;cursor/col LDA pen-col GTH ,&skip JCN ( FIXME )
-    ;cur-pos JSR2 STA
-    ;cursor/col LDA #01 ADD ;cursor/col STA
-    ;draw-all JSR2
-    &skip BRK )
-
 ( TODO: handle last line )
 @newline ( c^ -> )
     #0a ;cur-pos JSR2 ;shift-right JSR2
     #00 ;cursor/col STA
     ;cursor/row LDA INC ;cursor/row STA
     ;buffer/line-count LDA2k INC2 SWP2 STA2
+    ;ensure-visible-cursor JSR2
     ;draw-all JSR2
     BRK
 
@@ -268,14 +258,14 @@
 @at-line-start ( -> bool^ )
     ;cursor/col LDA #00 EQU JMP2r
 
-( TODO: handle first line )
 @backspace ( -> )
     ;at-buffer-start JSR2 ,&skip JCN
     ;at-line-start JSR2 ,&prev-line JCN
         ;cur-col JSR2 #01 SUB ;cursor/col STA
         ,&finish JMP
-    &prev-line ( TODO: what if row=0 but offset>0 ? )
-        ;cursor/row LDA #01 SUB ;cursor/row STA
+    &prev-line
+        ;cur-line-num JSR2 #0001 SUB2
+        ;jump-to-line JSR2 ( TODO: fix weird eof behavior )
         ;cur-len JSR2 NIP ;cursor/col STA
         ;buffer/line-count LDA2k #0001 SUB2 SWP2 STA2
     &finish
@@ -365,6 +355,24 @@
     .Console/read DEI LIT 'g EQU ( M-g ) ;goto-line JCN2
     BRK
 
+@move-to-message-line ( -> )
+    #02 height #02 ADD ;term-move-cursor JSR2 JMP2r
+
+( TODO: filename prmopt )
+@save ( -> )
+    ;buffer/limit LDA2 ;buffer/data SUB2 STH2 ( [size] )
+    ;tmp-file-name .File/name DEO2
+    STH2kr         .File/length DEO2
+    ;buffer/data   .File/write DEO2
+
+    ;move-to-message-line JSR2
+    .File/success DEI2 STH2r EQU2 ( ok? ) ,&ok JCN
+    ;messages/save-failed ,&finish JMP
+    &ok ;messages/save-ok
+    &finish ;print JSR2 BRK
+
+@tmp-file-name "file.tmp 00
+
 ( TODO: C-g or C-h for help )
 ( TODO: C-s for search )
 ( TODO: C-v for page down )
@@ -380,6 +388,7 @@
     .Console/read DEI #0c EQU ( C-l ) ;refresh JCN2
     .Console/read DEI #0d EQU ( \r  ) ;newline JCN2
     .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 #18 EQU ( C-x ) ;quit JCN2
     .Console/read DEI #1a EQU ( C-z ) ;debug JCN2
@@ -582,18 +591,6 @@
 @fits-in-one-screen ( -> bool^ )
     ;buffer/line-count LDA2 ;term/rows LDA2 INC2 LTH2 JMP2r
 
-( @doc-start ( -> s* ) ;buffer/data JMP2r
-@doc-limit ( -> s* ) ;buffer/limit LDA2 JMP2r
-@doc-last ( -> s* ) ;buffer/limit LDA2 #0001 SUB2 JMP2r )
-
-( @page-start ( -> s* ) ;buffer/offset LDA2 JMP2r
-@page-limit ( -> s* ) height ;rel-line JSR2 JMP2r
-@page-last ( -> s* ) height ;rel-line JSR2 #0001 SUB2 JMP2r )
-
-( @line-start ( -> s* ) ;cursor/row LDA ;rel-line JSR2 JMP2r
-@line-limit ( -> s* ) ;cursor/row LDA INC ;rel-line JSR2 JMP2r
-@line-last ( -> s* ) ;cursor/row LDA INC ;rel-line JSR2 #0001 SUB2 JMP2r )
-
 @mod-div ( x^ y^ -> x%d x/y )
     DIVk STHk MUL SUB STHr JMP2r
 
@@ -632,6 +629,8 @@
 
 @messages [ &input-error "input 20 "error 00
             &bytes 20 "bytes, 00
+            &save-ok "saved 00
+            &save-failed "failed 00
             &lines 20 "lines] 00
             &saved "-- 20 00
             &unsaved "** 20 00 ]