346 lines
13 KiB
VimL
346 lines
13 KiB
VimL
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" Vim global plugin for dragging virtual blocks
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" Last change: Tue Jul 24 07:19:35 EST 2012
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" Maintainer: Damian Conway
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" License: This file is placed in the public domain.
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"#########################################################################
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"## ##
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"## Add the following (uncommented) to your .vimrc... ##
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"## ##
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"## runtime plugin/dragvisuals.vim ##
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"## ##
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"## vmap <expr> <LEFT> DVB_Drag('left') ##
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"## vmap <expr> <RIGHT> DVB_Drag('right') ##
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"## vmap <expr> <DOWN> DVB_Drag('down') ##
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"## vmap <expr> <UP> DVB_Drag('up') ##
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"## vmap <expr> D DVB_Duplicate() ##
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"## ##
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"## " Remove any introduced trailing whitespace after moving... ##
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"## let g:DVB_TrimWS = 1 ##
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"## ##
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"## Or, if you use the arrow keys for normal motions, choose ##
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"## four other keys for block dragging. For example: ##
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"## ##
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"## vmap <expr> h DVB_Drag('left') ##
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"## vmap <expr> l DVB_Drag('right') ##
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"## vmap <expr> j DVB_Drag('down') ##
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"## vmap <expr> k DVB_Drag('up') ##
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"## ##
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"## Or: ##
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"## ##
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"## vmap <expr> <S-LEFT> DVB_Drag('left') ##
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"## vmap <expr> <S-RIGHT> DVB_Drag('right') ##
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"## vmap <expr> <S-DOWN> DVB_Drag('down') ##
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"## vmap <expr> <S-UP> DVB_Drag('up') ##
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"## ##
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"## Or even: ##
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"## ##
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"## vmap <expr> <LEFT><LEFT> DVB_Drag('left') ##
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"## vmap <expr> <RIGHT><RIGHT> DVB_Drag('right') ##
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"## vmap <expr> <DOWN><DOWN> DVB_Drag('down') ##
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"## vmap <expr> <UP><UP> DVB_Drag('up') ##
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"## ##
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"#########################################################################
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" If already loaded, we're done...
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if exists("loaded_dragvirtualblocks")
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finish
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endif
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let loaded_dragvirtualblocks = 1
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" Preserve external compatibility options, then enable full vim compatibility...
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let s:save_cpo = &cpo
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set cpo&vim
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"====[ Implementation ]====================================
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" Toggle this to stop trimming on drags...
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if !exists('g:DVB_TrimWS')
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let g:DVB_TrimWS = 1
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endif
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function! DVB_Drag (dir)
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" No-op in Visual mode...
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if mode() ==# 'v'
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return "\<ESC>gv"
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" Do Visual Line drag indirectly via temporary nmap
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" (to ensure we have access to block position data)...
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elseif mode() ==# 'V'
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" Set up a temporary convenience...
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exec "nnoremap <silent><expr><buffer> M \<SID>Drag_Lines('".a:dir."')"
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" Return instructions to implement the move and reset selection...
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return '"vyM'
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" Otherwise do Visual Block drag indirectly via temporary nmap
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" (to ensure we have access to block position data)...
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else
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" Set up a temporary convenience...
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exec "nnoremap <silent><expr><buffer> M \<SID>Drag_Block('".a:dir."')"
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" Return instructions to implement the move and reset selection...
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return '"vyM'
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endif
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endfunction
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" Duplicate selected block and place to the right...
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function! DVB_Duplicate ()
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exec "nnoremap <silent><expr><buffer> M \<SID>DuplicateBlock()"
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return '"vyM'
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endfunction
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function! s:DuplicateBlock ()
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nunmap <buffer> M
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" Locate block boundaries...
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let [buf_left, line_left, col_left, offset_left ] = getpos("'<")
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let [buf_right, line_right, col_right, offset_right] = getpos("'>")
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" Identify special '$' blocks...
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let dollar_block = 0
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let start_col = min([col_left+offset_left, col_right+offset_right])
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let end_col = max([col_left+offset_left, col_right+offset_right])
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let visual_width = end_col - start_col + 1
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for visual_line in split(getreg("v"),"\n")
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if strlen(visual_line) > visual_width
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let dollar_block = 1
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let visual_width = strlen(visual_line)
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endif
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endfor
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let square_up = (dollar_block ? (start_col+visual_width-2).'|' : '')
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set virtualedit=all
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return 'gv'.square_up.'yPgv'
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\. (visual_width-dollar_block) . 'lo' . (visual_width-dollar_block) . 'l'
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\. "y:set virtualedit=block\<CR>gv"
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\. (dollar_block ? 'o$' : '')
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endfunction
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" Kludge to hide change reporting inside implementation...
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let s:NO_REPORT = ":let b:DVB_report=&report\<CR>:let &report=1000000000\<CR>"
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let s:PREV_REPORT = ":let &report = b:DVB_report\<CR>"
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" Drag in specified direction in Visual Line mode...
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function! s:Drag_Lines (dir)
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" Clean up the temporary convenience...
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nunmap <buffer> M
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" Locate block being shifted...
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let [buf_left, line_left, col_left, offset_left ] = getpos("'<")
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let [buf_right, line_right, col_right, offset_right] = getpos("'>")
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" Drag entire lines left if possible...
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if a:dir == 'left'
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" Are all lines indented at least one space???
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let lines = getline(line_left, line_right)
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let all_indented = match(lines, '^[^ ]') == -1
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nohlsearch
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" If can't trim one space from start of each line, be a no-op...
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if !all_indented
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return 'gv'
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" Otherwise drag left by removing one space from start of each line...
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else
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return s:NO_REPORT
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\ . "gv:s/^ //\<CR>"
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\ . s:PREV_REPORT
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\ . "gv"
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endif
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" To drag entire lines right, add a space in column 1...
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elseif a:dir == 'right'
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return s:NO_REPORT
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\ . "gv:s/^/ /\<CR>:nohlsearch\<CR>"
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\ . s:PREV_REPORT
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\ . "gv"
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" To drag entire lines upwards...
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elseif a:dir == 'up'
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let EOF = line('$')
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" Can't drag up if at first line...
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if line_left == 1 || line_right == 1
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return 'gv'
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" Needs special handling at EOF (because cursor moves up on delete)...
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elseif line_left == EOF || line_right == EOF
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let height = line_right - line_left
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let select_extra = height ? height . 'j' : ""
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return s:NO_REPORT
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\ . 'gvxP'
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\ . s:PREV_REPORT
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\ . 'V' . select_extra
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" Otherwise just cut-move-paste-reselect...
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else
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let height = line_right - line_left
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let select_extra = height ? height . 'j' : ""
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return s:NO_REPORT
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\ . 'gvxkP'
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\ . s:PREV_REPORT
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\ . 'V' . select_extra
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endif
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" To drag entire lines downwards...
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elseif a:dir == 'down'
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let EOF = line('$')
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" This is how much extra we're going to have to reselect...
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let height = line_right - line_left
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let select_extra = height ? height . 'j' : ""
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" Needs special handling at EOF (to push selection down into new space)...
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if line_left == EOF || line_right == EOF
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return "O\<ESC>gv"
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" Otherwise, just cut-move-paste-reselect...
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else
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return s:NO_REPORT
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\ . 'gvxp'
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\ . s:PREV_REPORT
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\ . 'V' . select_extra
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endif
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endif
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endfunction
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" Drag in specified direction in Visual Block mode...
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function! s:Drag_Block (dir)
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" Clean up the temporary convenience...
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nunmap <buffer> M
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" Locate block being shifted...
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let [buf_left, line_left, col_left, offset_left ] = getpos("'<")
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let [buf_right, line_right, col_right, offset_right] = getpos("'>")
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" Identify special '$' blocks...
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let dollar_block = 0
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let start_col = min([col_left+offset_left, col_right+offset_right])
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let end_col = max([col_left+offset_left, col_right+offset_right])
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let visual_width = end_col - start_col + 1
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for visual_line in split(getreg("v"),"\n")
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if strlen(visual_line) > visual_width
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let dollar_block = 1
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let visual_width = strlen(visual_line)
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endif
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endfor
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let square_up = (dollar_block ? (start_col+visual_width-2).'|' : '')
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" Drag left...
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if a:dir == 'left'
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"Can't drag left at left margin...
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if col_left == 1 || col_right == 1
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return 'gv'
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" Otherwise reposition one column left (and optionally trim any whitespace)...
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elseif g:DVB_TrimWS
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" May need to be able to temporarily step past EOL...
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let prev_ve = &virtualedit
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set virtualedit=all
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" Are we moving past other text???
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let square_up_final = ""
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if dollar_block
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let lines = getline(line_left, line_right)
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if match(lines, '^.\{'.(start_col-2).'}\S') >= 0
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let dollar_block = 0
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let square_up_final = (start_col+visual_width-3).'|'
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endif
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endif
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let vcol = start_col - 2
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return 'gv'.square_up.'xhP'
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\ . s:NO_REPORT
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\ . "gvhoho:s/\\s*$//\<CR>gv\<ESC>"
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\ . ':set virtualedit=' . prev_ve . "\<CR>"
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\ . s:PREV_REPORT
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\ . ":nohlsearch\<CR>gv"
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\ . (dollar_block ? '$' : square_up_final )
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else
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return 'gv'.square_up.'xhPgvhoho'
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endif
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" Drag right...
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elseif a:dir == 'right'
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" May need to be able to temporarily step past EOL...
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let prev_ve = &virtualedit
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set virtualedit=all
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" Reposition block one column to the right...
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if g:DVB_TrimWS
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let vcol = start_col
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return 'gv'.square_up.'xp'
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\ . s:NO_REPORT
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\ . "gvlolo"
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\ . ":s/\\s*$//\<CR>gv\<ESC>"
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\ . ':set virtualedit=' . prev_ve . "\<CR>"
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\ . s:PREV_REPORT
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\ . (dollar_block ? 'gv$' : 'gv')
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else
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return 'gv'.square_up.'xp:set virtualedit=' . prev_ve . "\<CR>gvlolo"
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endif
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" Drag upwards...
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elseif a:dir == 'up'
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" Can't drag upwards at top margin...
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if line_left == 1 || line_right == 1
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return 'gv'
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endif
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" May need to be able to temporarily step past EOL...
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let prev_ve = &virtualedit
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set virtualedit=all
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" If trimming whitespace, jump to just below block to do it...
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if g:DVB_TrimWS
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let height = line_right - line_left + 1
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return 'gv'.square_up.'xkPgvkoko"vy'
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\ . height
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\ . 'j:s/\s*$//'
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\ . "\<CR>:nohlsearch\<CR>:set virtualedit="
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\ . prev_ve
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\ . "\<CR>gv"
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\ . (dollar_block ? '$' : '')
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" Otherwise just move and reselect...
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else
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return 'gv'.square_up.'xkPgvkoko"vy:set virtualedit='
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\ . prev_ve
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\ . "\<CR>gv"
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\ . (dollar_block ? '$' : '')
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endif
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" Drag downwards...
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elseif a:dir == 'down'
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" May need to be able to temporarily step past EOL...
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let prev_ve = &virtualedit
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set virtualedit=all
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" If trimming whitespace, move to just above block to do it...
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if g:DVB_TrimWS
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return 'gv'.square_up.'xjPgvjojo"vyk:s/\s*$//'
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\ . "\<CR>:nohlsearch\<CR>:set virtualedit="
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\ . prev_ve
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\ . "\<CR>gv"
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\ . (dollar_block ? '$' : '')
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" Otherwise just move and reselect...
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else
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return 'gv'.square_up.'xjPgvjojo"vy'
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\ . "\<CR>:set virtualedit="
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\ . prev_ve
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\ . "\<CR>gv"
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\ . (dollar_block ? '$' : '')
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endif
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endif
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endfunction
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" Restore previous external compatibility options
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let &cpo = s:save_cpo
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