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"
" vertical_region.vim: Move to a line that has non-space characters before or
" in the current column, usually to find lines that begin or end blocks in
" languages where indenting is used to show or specify structure.
"
" Author: Tom Ryder <tom@sanctum.geek.nz>
" License: Same as Vim itself
"
if exists('g:loaded_vertical_region') || &compatible
finish
endif
if v:version < 700
finish
endif
let g:loaded_vertical_region = 1
" Function for expression maps returning navigaton keys to press
function! s:VerticalRegion(count, up, mode) abort
" Get line and column number
let l:num = line('.')
let l:col = col('.')
" Move up or down through buffer, counting hits as we go
let l:hits = 0
while a:up ? l:num > 1 : l:num < line('$')
" Increment or decrement line number
let l:num += a:up ? -1 : 1
" If the line has any non-space characters up to the current column, we
" have a hit; break the loop as soon as we have the count we need
let l:line = getline(l:num)
if strpart(l:line, 0, l:col) =~# '\S'
let l:hits += 1
if l:hits == a:count
break
endif
endif
endwhile
" If not moving linewise for operator mode and not in first column, move to
" same column after line jump; is there a way to do this in one jump?
let l:keys = l:num . 'G'
if a:mode !=# 'o' && l:col > 1
let l:keys .= l:col - 1 . 'l'
endif
" Return normal mode commands
return l:keys
endfunction
" Define plugin maps
nnoremap <expr> <Plug>(VerticalRegionUpNormal)
\ <SID>VerticalRegion(v:count1, 1, 'n')
nnoremap <expr> <Plug>(VerticalRegionDownNormal)
\ <SID>VerticalRegion(v:count1, 0, 'n')
onoremap <expr> <Plug>(VerticalRegionUpOperator)
\ <SID>VerticalRegion(v:count1, 1, 'o')
onoremap <expr> <Plug>(VerticalRegionDownOperator)
\ <SID>VerticalRegion(v:count1, 0, 'o')
xnoremap <expr> <Plug>(VerticalRegionUpVisual)
\ <SID>VerticalRegion(v:count1, 1, 'x')
xnoremap <expr> <Plug>(VerticalRegionDownVisual)
\ <SID>VerticalRegion(v:count1, 0, 'x')
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