From 0da7b7b7b98e3c85f2984a008aa23876b93546ff Mon Sep 17 00:00:00 2001
From: Simon Ruderich <simon@ruderich.org>
Date: Sun, 26 Apr 2009 14:33:44 +0200
Subject: [PATCH] matrix: Add plugin, version 1.10.

Matrix screen saver.
---
 plugin/matrix.vim | 325 ++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 325 insertions(+)
 create mode 100644 plugin/matrix.vim

diff --git a/plugin/matrix.vim b/plugin/matrix.vim
new file mode 100644
index 0000000..9ed838d
--- /dev/null
+++ b/plugin/matrix.vim
@@ -0,0 +1,325 @@
+" matrix.vim - Don Yang (uguu.org)
+"
+" Matrix screensaver for VIM.
+"
+"Usage:
+" After loading the script, use :Matrix to start.
+" Press any key a few times to exit.
+"
+" You will need to edit s:mindelay and s:maxdelay below to match your
+" machine speed and window size.
+"
+"Known Issues:
+" Sometimes you need to press keys a few times to exit instead of just
+" once.  Press and hold is another way to go... feels like getchar is
+" checking for keypress state instead of keystroke availability.
+"
+" If the window is too small, script will not run.  If the window is
+" resized and become too small (less than 8 rows or 10 columns) after
+" the script started, script will abort and *buffers may be lost*, so
+" don't do that.  Resizing the window to most other sizes will be fine.
+"
+" Doesn't work if multiple windows exist before script started.  In
+" that case the script will abort with error message.
+"
+" If the current buffer is modified, some error messages will appear
+" before the script starts, and an extra window is left behind after
+" the script exits.  Workaround: save your buffers first.
+"
+"Other Info:
+" Inspired by cmatrix...
+" Didn't feel inspired enough to start using pico/nano, of course ^_^;
+"
+" 05/13/08 - disable cursorline, cursorcolumn and spell
+"            (thanks to Diederick Niehorster for the suggestion).
+" 12/21/06 - multiwindow support by S. Lockwood-Childs.
+" 10/03/05 - added silent! to cursor positioning code to stop drawing
+"            numbers during animation (thanks to David Eggum for the
+"            suggestion).
+" 10/02/05 - disable showmatch
+" 03/16/05 - make new buffer modifiable before running
+" 01/27/05 - added sleep to consume less CPU
+"            removed frame counter
+" 01/26/05 - initial version
+
+
+" Speed range, must be positive.  Lower delay = faster.
+let s:mindelay = 1
+let s:maxdelay = 5
+
+" Session file for preserving original window layout
+let s:session_file = tempname()
+
+
+function! s:Rand()
+   let b:seed = b:seed * 22695477 + 1
+   if b:seed < 0
+      return -b:seed
+   endif
+   return b:seed
+endfunction
+
+function! s:CreateObject(i)
+   while 1
+      let b:x{a:i} = s:Rand() % b:columns
+      if b:reserve{b:x{a:i}} > 4
+         break
+      endif
+   endwhile
+   let b:y{a:i} = 1
+   let b:t{a:i} = s:Rand() % b:s{b:x{a:i}}
+   let b:head{a:i} = s:Rand() % 4
+   let b:len{a:i} = s:Rand() % b:h + 3
+   let b:reserve{b:x{a:i}} = 1 - b:len{a:i}
+endfunction
+
+function! s:DrawObject(i)
+   let x = b:x{a:i} * 2 + 1
+   let y = b:y{a:i}
+
+   " Draw head
+   if y <= b:h
+      if b:head{a:i}
+         silent! exec 'norm! :' . y . nr2char(13) . x . '|R' . b:d[s:Rand()%b:dl] . '_' . nr2char(27)
+         if y > 1
+            silent! exec 'norm! kR' . ((s:Rand() % 2) ? '`' : ' ') . nr2char(27)
+         endif
+      else
+         let a = ((s:Rand() % 2) ? '`' : ' ') . nr2char(27)
+         silent! exec 'norm! :'. y . nr2char(13) . x . '|R' . b:d[s:Rand() % b:dl] . a
+      endif
+   else
+      if b:head{a:i} && y == b:h + 1
+         silent! exec 'norm! :' . b:h . nr2char(13) . (x + 1) . '|R' . ((s:Rand() % 2) ? '`' : ' ') . nr2char(27)
+      endif
+   endif
+
+   " Draw tail
+   let y = y - b:len{a:i}
+   if 1 <= y && y <= b:h
+      silent! exec 'norm! :'. y . nr2char(13) . x . '|R  ' . nr2char(27)
+   endif
+   let b:reserve{b:x{a:i}} = y
+endfunction
+
+function! s:Animate()
+   let i = 0
+
+   while i < b:objcount
+      " Animate object
+      if b:t{i} <= 0
+         if b:y{i} - b:len{i} <= b:h
+            " Draw
+            call s:DrawObject(i)
+            let b:t{i} = b:s{b:x{i}}
+            let b:y{i} = b:y{i} + 1
+         else
+            " Regenerate
+            call s:CreateObject(i)
+         endif
+      endif
+
+      let b:t{i} = b:t{i} - 1
+      let i = i + 1
+   endwhile
+   redraw
+   if getchar(1)
+      let b:run = 0
+   endif
+   sleep 20m
+endfunction
+
+function! s:Reset()
+   " Clear screen
+   let b:w = winwidth(0)
+   let b:h = winheight(0)
+   exec 'norm! gg"_dG' . b:h . 'O' . nr2char(27) . 'gg'
+   redraw
+   if b:w < 10 || b:h < 8
+      let b:run = 0
+      return
+   endif
+
+   " Set number of columns.  This is rounded down due to line wrapping
+   " at the last column if the screen width is even.  So you end up
+   " seeing the cursor blinking a lot at the right side of the screen.
+   " Alternatively, ':set rl' before running the script to have it
+   " blink on the left side.
+   let b:columns = (b:w - 1) / 2
+
+   " Initialize columns.
+   let i = 0
+   while i < b:columns
+      " Set delay time.  Each column gets the same delay time.
+      let b:s{i} = s:Rand() % (s:maxdelay - s:mindelay) + s:mindelay
+
+      " Unreserve column
+      let b:reserve{i} = b:h
+      let i = i + 1
+   endwhile
+
+   " Initialize objects
+   let b:objcount = b:columns - 2
+   let i = 0
+   while i < b:objcount
+      call s:CreateObject(i)
+      let i = i + 1
+   endwhile
+endfunction
+
+function! s:Init()
+   " Create new buffer and hide the existing buffers.  Hiding the
+   " existing buffers without switching to a new buffer preserves
+   " undo history.
+   exec 'mksession! ' . s:session_file
+   let s:num_orig_win = winnr("$")
+
+   " move to top window, so created window will become window 1,
+   " then attempt to create new window
+   1 wincmd w
+   silent! new
+
+   " check that there really is an additional window
+   if winnr("$") != s:num_orig_win + 1
+      return 1
+   endif
+   let s:newbuf = bufnr('%')
+
+   " close all but window 1, which is the new window
+   only
+
+   setl bh=delete bt=nofile ma nolist nonu noro noswf tw=0 nowrap
+
+   " Set GUI options
+   if has('gui')
+      let s:o_gcr = &gcr
+      let s:o_go = &go
+      set gcr=a:ver1-blinkon0 go=
+   endif
+   if has('cmdline_info')
+      let s:o_ru = &ru
+      let s:o_sc = &sc
+      set noru nosc
+   endif
+   if has('title')
+      let s:o_ts = &titlestring
+      exec 'set titlestring=\ '
+   endif
+   if v:version >= 700
+      let s:o_spell = &spell
+      let s:o_cul = &cul
+      let s:o_cuc = &cuc
+      set nospell nocul nocuc
+   endif
+   let s:o_ch = &ch
+   let s:o_ls = &ls
+   let s:o_lz = &lz
+   let s:o_siso = &siso
+   let s:o_sm = &sm
+   let s:o_smd = &smd
+   let s:o_so = &so
+   let s:o_ve = &ve
+   set ch=1 ls=0 lz nosm nosmd siso=0 so=0 ve=all
+
+   " Initialize PRNG
+   let b:seed = localtime()
+   let b:run = 1
+
+   " Clear screen and initialize objects
+   call s:Reset()
+
+   " Set colors.  Output looks better if your color scheme has black
+   " background.  I would rather not have the script change the
+   " current color scheme since there is no good way to restore them
+   " afterwards.
+   hi MatrixHidden ctermfg=Black ctermbg=Black guifg=#000000 guibg=#000000
+   hi MatrixNormal ctermfg=DarkGreen ctermbg=Black guifg=#008000 guibg=#000000
+   hi MatrixBold ctermfg=LightGreen ctermbg=Black guifg=#00ff00 guibg=#000000
+   hi MatrixHead ctermfg=White ctermbg=Black guifg=#ffffff guibg=#000000
+   sy match MatrixNormal /^.*/ contains=MatrixHidden
+   sy match MatrixHidden contained /.`/ contains=MatrixBold
+   sy match MatrixHidden contained /._/ contains=MatrixHead
+   sy match MatrixBold contained /.\(`\)\@=/
+   sy match MatrixHead contained /.\(_\)\@=/
+
+   " Create random char dictionary
+   let b:d = ''
+   let i = 33
+   while i < 127
+      if i != 95 && i != 96
+         let b:d = b:d . nr2char(i)
+      endif
+      let i = i + 1
+   endwhile
+   let b:dl = strlen(b:d)
+   return 0
+endfunction
+
+function! s:Cleanup()
+   " Restore options
+   if has('gui')
+      let &gcr = s:o_gcr
+      let &go = s:o_go
+      unlet s:o_gcr s:o_go
+   endif
+   if has('cmdline_info')
+      let &ru = s:o_ru
+      let &sc = s:o_sc
+      unlet s:o_ru s:o_sc
+   endif
+   if has('title')
+      let &titlestring = s:o_ts
+      unlet s:o_ts
+   endif
+   if v:version >= 700
+      let &spell = s:o_spell
+      let &cul = s:o_cul
+      let &cuc = s:o_cuc
+      unlet s:o_cul s:o_cuc
+   endif
+   let &ch = s:o_ch
+   let &ls = s:o_ls
+   let &lz = s:o_lz
+   let &siso = s:o_siso
+   let &sm = s:o_sm
+   let &smd = s:o_smd
+   let &so = s:o_so
+   let &ve = s:o_ve
+   unlet s:o_ch s:o_ls s:o_lz s:o_siso s:o_sm s:o_smd s:o_so s:o_ve
+
+   " Restore old buffers
+   exec 'source ' . s:session_file
+   exec 'bwipe ' . s:newbuf
+   unlet s:newbuf
+
+   " Clear keystroke
+   let c = getchar(0)
+endfunction
+
+function! Matrix()
+   if s:Init()
+      echohl ErrorMsg
+      echon 'Can not create window'
+      echohl None
+      return
+   endif
+
+   while b:run
+      if b:w != winwidth(0) || b:h != winheight(0)
+         call s:Reset()
+      else
+         call s:Animate()
+      endif
+   endwhile
+
+   call s:Cleanup()
+endfunction
+
+
+if !has('virtualedit') || !has('windows') || !has('syntax')
+   echohl ErrorMsg
+   echon 'Not enough features, need at least +virtualedit, +windows and +syntax'
+   echohl None
+else
+   command! Matrix call Matrix()
+endif
-- 
2.44.1