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" Vim global plugin for math on visual regions
" Maintainer: Damian Conway
" License: This file is placed in the public domain.
"######################################################################
"## ##
"## To use: ##
"## ##
"## vmap <expr> ++ VMATH_YankAndAnalyse() ##
"## nmap ++ vip++ ##
"## ##
"## (or whatever keys you prefer to remap these actions to) ##
"## ##
"######################################################################
" If already loaded, we're done...
if exists("loaded_vmath")
finish
endif
let loaded_vmath = 1
" Preserve external compatibility options, then enable full vim compatibility...
let s:save_cpo = &cpo
set cpo&vim
" Grab visual selection and do simple math on it...
function! VMATH_YankAndAnalyse ()
if &showmode
" Don't reselect the visual region if showmode is enabled
" because it will clobber the sum/avg/etc report with the
" "-- VISUAL --" message.
return "y:call VMATH_Analyse()\<CR>"
else
return "y:call VMATH_Analyse()\<CR>gv"
endif
endfunction
" What to consider a number...
let s:NUM_PAT = '^[+-]\?\d\+\%([.]\d\+\)\?\([eE][+-]\?\d\+\)\?$'
" How widely to space the report components...
let s:REPORT_GAP = 3 "spaces between components
" Do simple math on current yank buffer...
function! VMATH_Analyse ()
" Extract data from selection...
let selection = getreg('')
let raw_numbers = filter(split(selection), 'v:val =~ s:NUM_PAT')
let numbers = map(copy(raw_numbers), 'str2float(v:val)')
" Results include a newline if original selection did...
let newline = selection =~ "\n" ? "\n" : ""
" Calculate and en-register various interesting metrics...
let summation = len(numbers) ? join( numbers, ' + ') : '0'
call setreg('s', s:tidy( eval( summation ) )) " Sum --> register s
call setreg('a', s:average(raw_numbers) ) " Average --> register a
call setreg('x', s:tidy( s:max(numbers) )) " Max --> register x
call setreg('n', s:tidy( s:min(numbers) )) " Min --> register n
call setreg('r', @n . ' to ' . @x ) " Range --> register r
call setreg('c', len(numbers) ) " Count --> register c
" Default paste buffer should depend on original contents (TODO)
call setreg('', @s )
" Report...
let gap = repeat(" ", s:REPORT_GAP)
highlight NormalUnderlined term=underline cterm=underline gui=underline
echohl NormalUnderlined
echo 's'
echohl NONE
echon 'um: ' . @s . gap
echohl NormalUnderlined
echon 'a'
echohl NONE
echon 'vg: ' . @a . gap
echon 'mi'
echohl NormalUnderlined
echon 'n'
echohl NONE
echon ': ' . @n . gap
echon 'ma'
echohl NormalUnderlined
echon 'x'
echohl NONE
echon ': ' . @x . gap
echohl NormalUnderlined
echon 'c'
echohl NONE
echon 'ount: ' . @c
endfunction
" Prettify numbers...
function! s:tidy (number)
let tidied = printf('%g', a:number)
return substitute(tidied, '[.]0\+$', '', '')
endfunction
" Compute average with meaningful number of decimal places...
function! s:average (numbers)
" Compute average...
let summation = eval( len(a:numbers) ? join( a:numbers, ' + ') : '0' )
let avg = 1.0 * summation / s:max([len(a:numbers), 1])
" Determine significant figures...
let min_decimals = 15
for num in a:numbers
let decimals = strlen(matchstr(num, '[.]\d\+$')) - 1
if decimals < min_decimals
let min_decimals = decimals
endif
endfor
" Adjust answer...
return min_decimals > 0 ? printf('%0.'.min_decimals.'f', avg)
\ : string(avg)
endfunction
" Reimplement these because the builtins don't handle floats (!!!)
function! s:max (numbers)
if !len(a:numbers)
return 0
endif
let numbers = copy(a:numbers)
let maxnum = numbers[0]
for nextnum in numbers[1:]
if nextnum > maxnum
let maxnum = nextnum
endif
endfor
return maxnum
endfunction
function! s:min (numbers)
if !len(a:numbers)
return 0
endif
let numbers = copy(a:numbers)
let minnum = numbers[0]
for nextnum in numbers[1:]
if nextnum < minnum
let minnum = nextnum
endif
endfor
return minnum
endfunction
" Restore previous external compatibility options
let &cpo = s:save_cpo
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