saving works pretty well

femto.tal

@@ -96,6 +96,8 @@
 
 @state [
     &saw-esc $1     ( did we just see ESC? )
+    &modified $1    ( has the buffer been modified? )
+    &quitting $1    ( are we in the process of quitting? )
 ]
 
 ( prompt uses .tmp/pos and .tmp/data to track user input )
@@ -269,20 +271,18 @@
     ;cur-rel-row JSR2 #0001 LTH2 ,&screen-up JCN
     ;dec-row JSR2
     ;draw-statusbar JSR2
-    ;draw-cursor JSR2 BRK
+    &done ;draw-cursor JSR2 BRK
     &screen-up
     ;cur-abs-row JSR2 #0001 SUB2
     ;jump-to-line JSR2
-    ;draw-all JSR2
+    ;draw-all JSR2 BRK
-    &done BRK
 
 @down ( -> )
     ;cur-abs-row JSR2 ;last-abs-row JSR2 EQU2 ,&done JCN
     ;inc-row JSR2
     ;ensure-visible-cursor JSR2
     ;draw-statusbar JSR2
-    ;draw-cursor JSR2 BRK
+    &done ;draw-cursor JSR2 BRK
-    &done BRK
 
 @page-up ( -> )
     ;bof-is-visible JSR2 ,&at-bof JCN
@@ -315,11 +315,33 @@
         ;cur-len JSR2 .cursor/col STZ2
         ;draw-cursor JSR2 BRK
 
-@quit quit!
+@quit
+    #01 .state/quitting STZ
+    .state/modified LDZ ,&is-modified JCN
+        quit!
+    &is-modified
+        ;messages/quit-prompt ;messages/null ;do-quit ;start-prompt JSR2
+        ;draw-prompt JSR2
+        ;draw-cursor JSR2
+        BRK
 
-@ignore BRK
+@do-quit
+    .tmp/data LDZ LIT 'n EQU ;quit-now JCN2
+    .tmp/data LDZ LIT 'y EQU ;save JCN2
+        #00 .state/quitting STZ
+        ;move-to-message-line JSR2
+        ;messages/unknown-input ;print JSR2
+        ;tmp/data ;print JSR2
+        BRK
+
+@quit-now quit!
+
+@ignore
+    ;draw-cursor JSR2
+    BRK
 
 @insert ( c^ -> )
+    #01 .state/modified STZ
     ;cur-pos JSR2 ;shift-right JSR2
     ;cur-col JSR2 INC2 .cursor/col STZ2
     ;draw-all JSR2
@@ -334,6 +356,7 @@
     BRK
 
 @insert-tab ( -> )
+    #01 .state/modified STZ
     .config/insert-tabs LDZ ,&use-tabs JCN
     #0000 .config/tab-width LDZ2 SUB2
     &loop
@@ -348,6 +371,7 @@
 
 ( TODO: handle last line )
 @newline ( c^ -> )
+    #01 .state/modified STZ
     #0a ;cur-pos JSR2 ;shift-right JSR2
     #0000 .cursor/col STZ2
     ;inc-row JSR2
@@ -371,6 +395,7 @@
     GTH2 JMP2r
 
 @backspace ( -> )
+    #01 .state/modified STZ
     ;at-buffer-start JSR2 ,&skip JCN
     ;at-line-start JSR2 ,&prev-line JCN
         ;cur-col JSR2 #0001 SUB2 .cursor/col STZ2
@@ -394,6 +419,7 @@
     BRK
 
 @delete ( -> )
+    #01 .state/modified STZ
     ;last-pos JSR2 #0001 SUB2 ( lst-1 )
     ;cur-pos JSR2 LTH2 ,&skip JCN
     ;cur-pos JSR2 LDAk STH ( cur [c] )
@@ -515,8 +541,12 @@
     ;move-to-message-line JSR2
     .File/success DEI2 STH2r EQU2 ( ok? ) ,&ok JCN
     ;messages/save-failed ,&finish JMP
-    &ok ;messages/save-ok
+    &ok #00 .state/modified STZ ;messages/save-ok 
-    &finish ;print JSR2 ;tmp/data ;print JSR2 BRK
+    &finish
+        ;print JSR2 ;tmp/data ;print JSR2
+        ;draw-all JSR2
+        .state/quitting LDZ ;quit-now JCN2
+        BRK
 
 @tmp-file-name "file.tmp 00
 
@@ -531,6 +561,14 @@
     .Console/read DEI LIT 'v EQU ( M-v ) ;page-up JCN2
     BRK
 
+@clear-line ( -> )
+    ansi LIT '2 emit LIT 'K emit JMP2r
+
+@clear-message-line
+    ;move-to-message-line JSR2
+    ;clear-line JSR2
+    JMP2r
+
 @on-key-prompt
     .Console/read DEI #07 EQU ( C-g ) ;cancel-prompt JCN2
     .Console/read DEI #0d EQU ( \r  ) ;finish-prompt JCN2
@@ -540,10 +578,11 @@
     .Console/read DEI ( printable ASCII ) ;insert-prompt JMP2
     BRK
 
-( TODO: C-g or C-h for help )
+( TODO: C-h for help )
 ( TODO: C-s for search )
 ( TODO: tab input? )
 @on-key
+    ;clear-message-line JSR2
     .prompt/active LDZ ;on-key-prompt JCN2
     .state/saw-esc LDZ ;on-key-escaped JCN2
     .Console/read DEI #01 EQU ( C-a ) ;bol JCN2
@@ -608,6 +647,11 @@
     &on-prompt
         JMP2r
 
+@get-save-status
+    .state/modified LDZ ,&is-modified JCN
+                 ;messages/saved JMP2r
+    &is-modified ;messages/unsaved JMP2r
+
 @draw-statusbar ( -> )
     #0000 .term/rows LDZ2 ;term-move-cursor JSR2
     ;emit-color-reverse JSR2
@@ -618,7 +662,7 @@
     &done POP2 POP2 POP2r
 
     #0000 .term/rows LDZ2 ;term-move-cursor JSR2
-    ;messages/saved ;print JSR2
+    ;get-save-status JSR2 ;print JSR2
     ;filename ;print JSR2
     #20 emit
     LIT '[ emit
@@ -638,8 +682,7 @@
     JMP2r
 
 @draw-prompt ( -> )
-    #0000 .term/rows LDZ2 INC2 ;term-move-cursor JSR2
+    ;clear-message-line JSR2
-    ansi LIT '2 emit LIT 'K emit
     .prompt/active LDZ ,&is-active JCN
         JMP2r
     &is-active
@@ -929,12 +972,15 @@
     DEOr JMP2r
 
 ( various string constants used as messages for the user )
-@messages [ &input-error "input 20 "error: 20 00
+@messages [ &null 00
+            &input-error "input 20 "error: 20 00
             &bytes 20 "bytes, 00
             &save-ok "Successfully 20 "saved 20 00
             &save-failed "Failed 20 "to 20 "save 20 00
             &lines 20 "lines] 00
             &save-prompt "File 20 "Name 20 "to 20 "Write: 20 00
+            &quit-prompt "Save 20 "modified 20 "file 20 "(y/n)? 20 00
+            &unknown-input "Unknown 20 "input: 20 00
             &saved "-- 20 00
             &unsaved "** 20 00 ]