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| +++++ + ++++ + +++++++ ++ | |
| *+++++ + + ++++++++++++* + +++ +++++ | |
| ++ + + + +++++*+++ + ++ + +++ | |
| + + + + + + ++ + *++ | |
| + + ++ + ++ +++ + ++ | |
| ++ ++ * +++ ++ +++ + .+ | |
| ++ ++ ++ ++ *++ .-- - -- | |
| ---- -- -- -- -*- --- - -- | |
| - --- -- -- -- --* --- - -- | |
| -- -- -- -- -- --- *-------- | |
| -- -- -- -- -- -* -- - -. | |
| +++ + + ++ + + + + + ++ | |
| *++ + +++ + +++ + +++++ ++ | |
| +*++++ +++++++ + +++++++*+ + ++++ ++ + | |
| +++ +++ + +++*+ + ++ +. | |
| - - | |
| -- -- | |
| ---- - --*-- --- -- ----- -- | |
| - ----*-------- ------ - -- --*-- ------ ---- | |
| - ------*-- -- - - -- - --- -. + + +++ | |
| * + + + + + ++ +++ + + + +++ | |
| ++ + *+ + + + + ++ + + ++ | |
| + +++ ++ ++ * + ++ ++ ++ ++ | |
| ++ ++ ++ ++ + + *+ ++ .- -- | |
| -- -- -- ---- - -* ---- -- - | |
| -- -- -- -- --- - *- - --- -- - | |
| -- -- -- -- -- -*------- -- ---.+++ | |
| ++ +* + ++ ++ + ++ ++ ++++++ | |
| ++ + * + ++ + ++ ++ ++ | |
| +++ + ++++ +*+ +++++ ++ ++ ++ | |
| +++++++ * ++++ ++ + ++++ ++ + ++ ++ | |
| +*+ + .- - . -- -- -- -- -- | |
| - - --- - - | |
| .+ ++ +++ + | |
| ++++++ | |
| ++.` | |
| _____________________________________________________________________________ | |
| "> | |
| _____________________________________________________________________________ | |
| t: 0 | |
| hom /^hom | |
| mem gg:/^@c | |
| nex @mjyiW@" | |
| prv @mkyiW@" | |
| inc @mWx01 | |
| dec @mWx24 | |
| bef @mO@c 0x27j0lruk | |
| unu 0lr-@mlru/^@- lrc | |
| aft @mo@c 0x27k0lruj | |
| out @mWy$gg/^? @"lyl/^"> :noh $px27 | |
| stp `myl@rmm@h/\M^x18=@" Wy$@"`m | |
| reg /[][><+-.,`] | |
| clr :g/^@u/d @mWC0x27@o0WDGY@":noh | |
| tap 0 | |
| > @n | |
| < @p | |
| + @i | |
| - @d | |
| [ | |
| ] | |
| , | |
| . @o | |
| ` :the end | |
| ????????btl??c?????????????????? !"#$%&'()*+,-./0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\]^_`abcdefghijklmnopqrstuvwxyz{|}~ | |
| @b | |
| @c 0 | |
| @a | |
| " h go to the instructions | |
| " n next memory address | |
| " p previous memory address | |
| " i increment current memory address | |
| " d decrement current memory address | |
| " b add memory address before current one | |
| " u | |
| " a add memory address after current one | |
| " o output char at current memory address | |
| " s step through current input instruction | |
| " r increment current input instruction pointer | |
| " c clear memory and reset all pointers | |
| ggmm/^hom w"hyg_j"myg_j"nyg_j"pyg_j"iyg_j"dyg_j"byg_j"uyg_j"ayg_j"oyg_j"syg_j"ryg_j"cyg_:noh |
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The above is [almost] a BF interpreter (just missing the bracket and comma commands), which runs in Vim entirely via the Vim macro system, and which I created in mid to late 2012. The fancy message at the top is a sample program.
To use this, open it in Vim, hit
Gto go to the bottom line,yg_to copy it into the default register, then@"to run the default register. This will cause Vim to visit each of the command lines (hom, mem, nex, etc.), copying each into its particular register (note: you can view all registers by typing:reg, followed by enter). With that done, you can run the program. Here, the sample program is the "IT'S A TRAP" text at the top, created with figlet, and replaced by the BF program I wrote using—what else?—a Vim macro, and with a few * characters evenly spaced throughout to pad it out to fit perfectly, as there were a few more characters in the large, script, figlet characters.To run the program, type
641@s, and sit back; it'll take a while, and it will slowly print "it's a trap" in the output area (just below the program). The magic number 641 is simply the count of characters in the program, and the@sis the macro, stored in register s, that steps through a single command character in the program. You can of course use a smaller count to step fewer times, or just keep doing@sto step manually, one command at a time.Make sure your programs end with a ` (grave accent, aka 'backtick'). This meta command causes the interpreter to try to run a Vim command "the end", which doesn't exist, which crashes out of the macro playback, so even if you do 10000@s, to step the program 10k times, it'll still stop at the ` accent, i.e. it'll die at the grave, with the error "E492: Not an editor command: the end" - this is the expected method of termination, and not a bug! You could also pepper these characters throughout your program as breakpoints.
Note on efficiency: Because the interpreter uses search quite a lot to move the "program pointer" around, search highlighting ends up slowing it down a lot, by one or two orders of magnitude. This means that running
:set nohlsearchbefore a long run of steps will greatly speed up playback, while:set hlsearchto turn on search highlighting will slow it down a lot, so you can watch it operate a bit better (but epileptics beware: hlsearch being on causes a lot of flashing, including of the entire program text at the top!).Note 1: There are special characters in this Gist (all the
^Mcharacters), so copy/pasting the text may not work. You'll have to download it, either through "Download ZIP," or by clicking Raw and saving the raw version directly.Note 2: Though this has a .vim extension, it is not a valid VimL script. Don't try to source/run it as one!
Tested and working in Vim 8.0, both in a fully defaulted vim (
$ vim -u NONE), and in my heavily modified Vim with custom vimrc, hundreds of custom mappings, and 76 plugins. I attempted to use only Vim defaults in the interpreter, and I strive not to replace many of those in my own setup. YMMV.