From aed8ce9da277f5ecffe968b324f242c41c3b752a Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Sun, 7 Apr 2024 10:50:31 +0200 Subject: Adding upstream version 2:9.0.1378. Signed-off-by: Daniel Baumann --- runtime/macros/urm/README.txt | 47 +++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 47 insertions(+) create mode 100644 runtime/macros/urm/README.txt (limited to 'runtime/macros/urm/README.txt') diff --git a/runtime/macros/urm/README.txt b/runtime/macros/urm/README.txt new file mode 100644 index 0000000..a1ecc65 --- /dev/null +++ b/runtime/macros/urm/README.txt @@ -0,0 +1,47 @@ +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 +in vim: :so urm.vim +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 increment register +s decrement register +; execute command and then +() execute command while register 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. + -- cgit v1.2.3