Mercurial > vim
view runtime/macros/urm/README.txt @ 9830:6049c1f01391 v7.4.2190
commit https://github.com/vim/vim/commit/50fa8dd00c241fa0786fe92ecc02fee4e5d28e06
Author: Bram Moolenaar <Bram@vim.org>
Date: Tue Aug 9 22:58:21 2016 +0200
patch 7.4.2190
Problem: When startup test fails it's not easy to find out why.
GUI test fails with Gnome.
Solution: Add the help entry matches to a list an assert that.
Set $HOME for Gnome to create .gnome2 directory.
author | Christian Brabandt <cb@256bit.org> |
---|---|
date | Tue, 09 Aug 2016 23:00:08 +0200 |
parents | 3fc0f57ecb91 |
children | d6dde6229b36 |
line wrap: on
line source
This is another proof that Vim is perfectly compatible with Vi. The URM macro package was written by Rudolf Koenig ("Rudi") (rudolf@koeniglich.de) for hpux-vi in August 1991. Getting started: type in your shell: vim urm<RETURN> in vim: :so urm.vim<RETURN> in vim: * (to load the registers and boot the URM-machine :-) in vim: g (for 'go') and watch the fun. Per default, 3 and 4 are multiplied. Watch the Program counter, it is visible as a komma moving around. This is a "standard URM" (Universal register machine) interpreter. The URM concept is used in theoretical computer science to aid in theorem proving. Here it proves that vim is a general problem solver (if you bring enough patience). The interpreter begins with register 1 (not 0), without macros and more-lines capability. A dot marks the end of a program. (Bug: there must be a space after the dot.) The registers are the first few lines, beginning with a '>' . The program is the first line after the registers. You should always initialize the registers required by the program. Output register: line 2 Input registers: line 2 to ... Commands: a<n> increment register <n> s<n> decrement register <n> <x>;<y> execute command <x> and then <y> (<x>)<n> execute command <x> while register <n> is nonzero . ("dot blank") halt the machine. Examples: Add register 2 to register 3: (a2;s3)3. Multiply register 2 with register 3: (a4;a5;s2)2; ((a2;s4)4; s3; (a1;a4;s5)5; (a5;s1)1)3. There are more (complicated) examples in the file examples. Note, undo may take a while after a division.