361 lines
10 KiB
Forth
Executable file
361 lines
10 KiB
Forth
Executable file
#!/usr/bin/env retro
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# A Block Editor
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I've written numerous block editors over the years. This is a
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new one that I'm planning to eventually use with Retro/Native.
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This presents a visual, (briefly) modal interface.
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0-----#---1---------2---------3---------4---------5---------6---
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| This is the new block editor! |
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0---------1---------2---------3---------4---------5---------6---
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| Output is shown here |
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0---------1---------2---------3---------4---------5---------6---
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#2 1:0 ::
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The horizontal rulers have column indicators, there are cursor
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position indicators (and the actual cursor location shows at the
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intersection). The bottom line has the current block number, line
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number, and column number.
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Key Bindings
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| Key | Action |
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| --- | ------------------------------ |
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| H | Save and select previous block |
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| S | Save and select next block |
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| h | Move cursor left |
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| t | Move cursor down |
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| n | Move cursor up |
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| s | Move cursor right |
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| i | Save the current block |
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| y | Reload the current block |
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| a | Edit text |
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| c | Move cursor to prior word |
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| r | Move cursor to next word |
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| 1 | Evaluate the current block |
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| x | Erase the current block |
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| q | Save the Blocks and Quit |
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| ` | Clear output buffer |
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| 7 | Share block |
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| b | Copy line |
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| m | Paste line |
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| B | Copy block |
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| M | Paste block |
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| z | Delete line |
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The key bindings are oriented around the Dvorak keyboard layout
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which I use. The key map leverages an approach I stole from
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Samuel Falvo II's VIBE editor: the key handlers are words in
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the dictionary with a format like:
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editor:key<*>
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With the `*` being the key.
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# Sample Blocks
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This will create an empty `retro.blocks` file if one is not
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found. I have a sample included, but it is compressed. To use
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the sample run `gunzip retro.blocks` and keep a copy or a
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symlink to it in your CWD.
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# Configuration
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I define the number of blocks and the file to use. On the non
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hosted Retro systems the block file will be replaced by a
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block storage device.
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~~~
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#16 'BLOCKS const
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~~~
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# Variables
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I am keeping some data in variables. This will include the
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current block number, the current line, and the current row.
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~~~
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'CurrentBlock var
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'CurrentLine var
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'CurrentCol var
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~~~
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# Buffers
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I have one memory region for the current block and a second
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one for the entire set of blocks. I keep the blocks in RAM
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for performance.
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There is also one half block set aside for the output display.
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This is the `TOB` (Text Output Buffer).
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~~~
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'Block d:create #1025 allot
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'Blocks d:create
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BLOCKS #1024 * allot
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'TOB d:create #513 allot
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~~~
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# Block File I/O
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This should be replaced with the block storage device once
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that is added to Nga.
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~~~
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:blocks:initialize (-)
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&Blocks #1024 BLOCKS * [ #32 over store n:inc ] times drop ;
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:block:write (-)
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;
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:block:read (-)
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;
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~~~
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These are used to load a block into the active buffer and
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copy it back to the full set.
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~~~
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{{
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:current-block @CurrentBlock #1024 * &Blocks + ;
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:next [ n:inc ] bi@ ;
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:copy dup-pair fetch swap store ;
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---reveal---
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:block:select (n-)
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!CurrentBlock
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[ &Block buffer:set
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current-block #1024
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[ fetch-next buffer:add ] times drop ] buffer:preserve ;
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:block:update (-)
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current-block &Block #1024 [ copy next ] times drop-pair ;
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}}
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~~~
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# Block Display
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This is fairly long, but mostly due to my desire to have a
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more complex display with column and cursor indicators.
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It should be pretty straightforward though.
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~~~
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:tty:clear (-) clear ;
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{{
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:cursor (cl-)
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swap vga:move-cursor ;
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:indicators @CurrentCol #3 + #0 cursor $# c:put
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#1 @CurrentLine #1 + cursor $# c:put
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#1 #24 cursor ;
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:ruler
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'___0---------1---------2---------3 s:put
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'---------4---------5---------6--- s:put nl ;
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:block# $# c:put @CurrentBlock n:put ;
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:pos @CurrentLine n:put $: c:put @CurrentCol n:put ;
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:status block# sp pos '_::_ s:put dump-stack ;
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:format '_|_ s:put call '_| s:put nl ;
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:line [ #64 [ fetch-next c:put ] times ] format ;
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:code &Block #16 [ line ] indexed-times drop ;
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:format '_|_ s:put call '_| s:put nl ;
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:tob &TOB #4 [ line ] times drop ;
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---reveal---
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:block:display (-)
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tty:clear ruler code ruler tob ruler indicators status ;
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}}
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~~~
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# Text Output Buffer
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~~~
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{{
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'TNext var
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:scroll? (-f)
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@TNext #256 gt? ;
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:scroll-up (-)
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&TOB #64 + &TOB #193 copy #193 !TNext
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&TOB #193 + #64 [ #32 over store n:inc ] times drop ;
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---reveal---
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:c:put<TOB> (c-)
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dup #10 eq? [ drop @TNext #64 + dup #64 mod - !TNext ]
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[ @TNext &TOB + store &TNext v:inc ] choose
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scroll? [ scroll-up ] if ;
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:with-tob (q-)
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&c:put<TOB> &c:put set-hook call &c:put unhook ;
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:tob:initialize (-)
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&TOB #512 [ #32 over store n:inc ] times drop #0 !TNext ;
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}}
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~~~
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# The Editor Core
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~~~
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{{
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:cursor ;
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:handler
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c:get
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'editor:key<_> [ #11 + store ] sip d:lookup
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dup n:-zero? [ d:xt fetch call ] [ drop ] choose ;
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---reveal---
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'DoneEditing var
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:edit
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FALSE !DoneEditing
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tob:initialize blocks:initialize block:read #0 block:select
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[ block:display cursor handler @DoneEditing ] until ;
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}}
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~~~
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# The Rest
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# Key Handlers
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All of the actual work is done by the words that make up
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the key handlers.
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## Evaluate block
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The `1` key is used to evaluate a block. To avoid wasting
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space, a block of memory is allocated to use as a temporary
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`Heap`. The actual `Heap` is saved and restored during the
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tokenization.
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~~~
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{{
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'Tokens d:create #4097 allot
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:prepare &Tokens #4096 [ #0 over store n:inc ] times drop ;
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:generate &Tokens !Heap &Block #32 s:tokenize ;
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:item dup s:length n:zero? [ drop ] [ interpret ] choose ;
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:process [ item ] a:for-each ;
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---reveal---
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:editor:key<1>
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[ prepare &Heap [ generate ] v:preserve process ] with-tob ;
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}}
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~~~
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## Cursor and Block Movement
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~~~
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{{
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:boundaries
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&CurrentLine #0 #15 v:limit
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&CurrentCol #0 #63 v:limit ;
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:keep-in-range #0 BLOCKS n:dec n:limit ;
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---reveal---
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:editor:key<H>
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block:update
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@CurrentBlock n:dec keep-in-range block:select tty:clear ;
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:editor:key<S>
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block:update
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@CurrentBlock n:inc keep-in-range block:select tty:clear ;
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:editor:key<n> &CurrentLine v:dec boundaries ;
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:editor:key<h> &CurrentCol v:dec boundaries ;
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:editor:key<s> &CurrentCol v:inc boundaries ;
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:editor:key<t> &CurrentLine v:inc boundaries ;
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}}
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~~~
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## Navigate to prior, next word
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These are helpful to quickly navigate through a block.
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~~~
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{{
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:limit (n-n) &Block dup #1024 + n:limit ;
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:fetch-prior (a-Ac) [ n:dec ] [ fetch ] bi ;
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:find-next-word
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@CurrentLine #64 * @CurrentCol + &Block + n:inc
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repeat fetch-next #32 -eq? 0; drop again ;
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:find-prior-word
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@CurrentLine #64 * @CurrentCol + &Block + n:dec
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repeat fetch-prior #32 -eq? 0; drop again ;
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:select-next (-)
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find-next-word n:dec limit &Block -
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#64 /mod !CurrentLine !CurrentCol ;
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:select-prior (-)
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find-prior-word n:inc limit &Block -
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#64 /mod !CurrentLine !CurrentCol ;
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---reveal---
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:editor:key<c> select-prior ;
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:editor:key<r> select-next ;
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}}
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~~~
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## Edit (Replace)
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~~~
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{{
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:dest @CurrentLine #64 * @CurrentCol + &Block + ;
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:chars over s:length ;
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:copy [ dup-pair &fetch dip store &n:inc bi@ ] times ;
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---reveal---
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:editor:key<a>
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s:get dest chars copy drop-pair tty:clear ;
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}}
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~~~
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## Erase
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~~~
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:editor:key<x> &Block #1024 [ #32 over store n:inc ] times drop ;
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:editor:key<z> &Block @CurrentLine #64 * + #64
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[ #32 over store n:inc ] times drop ;
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~~~
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## Copy/Paste
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~~~
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{{
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'Copy d:create #65 allot
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'CopyBlock d:create #1025 allot
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---reveal---
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:editor:key<b> &Block @CurrentLine #64 * + &Copy #64 copy ;
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:editor:key<m> &Copy &Block @CurrentLine #64 * + #64 copy ;
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:editor:key<B> &Block &CopyBlock #1024 copy ;
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:editor:key<M> &CopyBlock &Block #1024 copy ;
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}}
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~~~
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## Misc.
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~~~
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:editor:key<i> block:update block:write ;
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:editor:key<y> @CurrentBlock block:select ;
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:editor:key<q> TRUE !DoneEditing ;
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:editor:key<`> tob:initialize ;
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~~~
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~~~
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:editor:key<!>
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&Block @CurrentBlock #2 * ata:write
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&Block #512 + @CurrentBlock #2 * n:inc ata:write ;
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:editor:key<@>
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&Block @CurrentBlock #2 * ata:read
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&Block #512 + @CurrentBlock #2 * n:inc ata:read ;
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~~~
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