65 lines
1.5 KiB
Forth
Executable file
65 lines
1.5 KiB
Forth
Executable file
#!/usr/bin/env rre
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This will (hopefully) be a functional text editor written in RETRO.
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Interface:
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<filename> : <line-count> : <current-line>
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---------------------------------------------------------------
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99:
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100: :n:square dup * ;
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101:
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* 102: This is the current line
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103:
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---------------------------------------------------------------
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As with my old block editor, this will be primarily line oriented.
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And it's visual, with some simple key bindings.
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~~~
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'SourceFile var
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'FID var
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#0 sys:argv s:keep !SourceFile
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:count-lines #0 @SourceFile [ drop n:inc ] file:for-each-line ;
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#12 'MAX-LINES const
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'CurrentLine var
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:pad (n-n)
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dup #0 #9 n:between? [ '___ puts ] if
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dup #10 #99 n:between? [ '__ puts ] if
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dup #100 #999 n:between? [ '_ puts ] if ;
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:current (n-n)
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dup @CurrentLine eq? [ '*_ puts ] [ '__ puts ] choose ;
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:skip-to
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@CurrentLine n:dec #0 n:max [ @FID file:read-line drop ] times ;
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:display
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@SourceFile file:R file:open !FID
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skip-to
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@CurrentLine count-lines MAX-LINES n:min [ dup current pad putn n:inc ':_ puts @FID file:read-line puts nl ] times drop
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@FID file:close ;
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:handler
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getc
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$j [ &CurrentLine v:inc ] case
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$k [ &CurrentLine v:dec ] case
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$q [ 'stty_-cbreak unix:system #0 unix:exit ] case
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drop ;
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:loop
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'stty_cbreak unix:system
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repeat
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ASCII:ESC '%c[2J s:with-format puts nl
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@CurrentLine count-lines @SourceFile '%s_:_%n_:_%n\n s:with-format puts
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display
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#72 [ $- putc ] times nl
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handler
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again ;
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loop
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~~~
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