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Diffstat (limited to 'stow/vim/.vim/plugin/dragvisuals.vim')
| -rw-r--r-- | stow/vim/.vim/plugin/dragvisuals.vim | 345 |
1 files changed, 345 insertions, 0 deletions
diff --git a/stow/vim/.vim/plugin/dragvisuals.vim b/stow/vim/.vim/plugin/dragvisuals.vim new file mode 100644 index 0000000..12c4f5d --- /dev/null +++ b/stow/vim/.vim/plugin/dragvisuals.vim @@ -0,0 +1,345 @@ +" Vim global plugin for dragging virtual blocks +" Last change: Tue Jul 24 07:19:35 EST 2012 +" Maintainer: Damian Conway +" License: This file is placed in the public domain. + +"######################################################################### +"## ## +"## Add the following (uncommented) to your .vimrc... ## +"## ## +"## runtime plugin/dragvisuals.vim ## +"## ## +"## vmap <expr> <LEFT> DVB_Drag('left') ## +"## vmap <expr> <RIGHT> DVB_Drag('right') ## +"## vmap <expr> <DOWN> DVB_Drag('down') ## +"## vmap <expr> <UP> DVB_Drag('up') ## +"## vmap <expr> D DVB_Duplicate() ## +"## ## +"## " Remove any introduced trailing whitespace after moving... ## +"## let g:DVB_TrimWS = 1 ## +"## ## +"## Or, if you use the arrow keys for normal motions, choose ## +"## four other keys for block dragging. For example: ## +"## ## +"## vmap <expr> h DVB_Drag('left') ## +"## vmap <expr> l DVB_Drag('right') ## +"## vmap <expr> j DVB_Drag('down') ## +"## vmap <expr> k DVB_Drag('up') ## +"## ## +"## Or: ## +"## ## +"## vmap <expr> <S-LEFT> DVB_Drag('left') ## +"## vmap <expr> <S-RIGHT> DVB_Drag('right') ## +"## vmap <expr> <S-DOWN> DVB_Drag('down') ## +"## vmap <expr> <S-UP> DVB_Drag('up') ## +"## ## +"## Or even: ## +"## ## +"## vmap <expr> <LEFT><LEFT> DVB_Drag('left') ## +"## vmap <expr> <RIGHT><RIGHT> DVB_Drag('right') ## +"## vmap <expr> <DOWN><DOWN> DVB_Drag('down') ## +"## vmap <expr> <UP><UP> DVB_Drag('up') ## +"## ## +"######################################################################### + + +" If already loaded, we're done... +if exists("loaded_dragvirtualblocks") + finish +endif +let loaded_dragvirtualblocks = 1 + +" Preserve external compatibility options, then enable full vim compatibility... +let s:save_cpo = &cpo +set cpo&vim + +"====[ Implementation ]==================================== + +" Toggle this to stop trimming on drags... +if !exists('g:DVB_TrimWS') + let g:DVB_TrimWS = 1 +endif + +function! DVB_Drag (dir) + " No-op in Visual mode... + if mode() ==# 'v' + return "\<ESC>gv" + + " Do Visual Line drag indirectly via temporary nmap + " (to ensure we have access to block position data)... + elseif mode() ==# 'V' + " Set up a temporary convenience... + exec "nnoremap <silent><expr><buffer> M \<SID>Drag_Lines('".a:dir."')" + + " Return instructions to implement the move and reset selection... + return '"vyM' + + " Otherwise do Visual Block drag indirectly via temporary nmap + " (to ensure we have access to block position data)... + else + " Set up a temporary convenience... + exec "nnoremap <silent><expr><buffer> M \<SID>Drag_Block('".a:dir."')" + + " Return instructions to implement the move and reset selection... + return '"vyM' + endif +endfunction + +" Duplicate selected block and place to the right... +function! DVB_Duplicate () + exec "nnoremap <silent><expr><buffer> M \<SID>DuplicateBlock()" + return '"vyM' +endfunction + +function! s:DuplicateBlock () + nunmap <buffer> M + " Locate block boundaries... + let [buf_left, line_left, col_left, offset_left ] = getpos("'<") + let [buf_right, line_right, col_right, offset_right] = getpos("'>") + + " Identify special '$' blocks... + let dollar_block = 0 + let start_col = min([col_left+offset_left, col_right+offset_right]) + let end_col = max([col_left+offset_left, col_right+offset_right]) + let visual_width = end_col - start_col + 1 + for visual_line in split(getreg("v"),"\n") + if strlen(visual_line) > visual_width + let dollar_block = 1 + let visual_width = strlen(visual_line) + endif + endfor + let square_up = (dollar_block ? (start_col+visual_width-2).'|' : '') + + set virtualedit=all + return 'gv'.square_up.'yPgv' + \. (visual_width-dollar_block) . 'lo' . (visual_width-dollar_block) . 'l' + \. "y:set virtualedit=block\<CR>gv" + \. (dollar_block ? 'o$' : '') +endfunction + + +" Kludge to hide change reporting inside implementation... +let s:NO_REPORT = ":let b:DVB_report=&report\<CR>:let &report=1000000000\<CR>" +let s:PREV_REPORT = ":let &report = b:DVB_report\<CR>" + + +" Drag in specified direction in Visual Line mode... +function! s:Drag_Lines (dir) + " Clean up the temporary convenience... + nunmap <buffer> M + + " Locate block being shifted... + let [buf_left, line_left, col_left, offset_left ] = getpos("'<") + let [buf_right, line_right, col_right, offset_right] = getpos("'>") + + " Drag entire lines left if possible... + if a:dir == 'left' + " Are all lines indented at least one space??? + let lines = getline(line_left, line_right) + let all_indented = match(lines, '^[^ ]') == -1 + nohlsearch + + " If can't trim one space from start of each line, be a no-op... + if !all_indented + return 'gv' + + " Otherwise drag left by removing one space from start of each line... + else + return s:NO_REPORT + \ . "gv:s/^ //\<CR>" + \ . s:PREV_REPORT + \ . "gv" + endif + + " To drag entire lines right, add a space in column 1... + elseif a:dir == 'right' + return s:NO_REPORT + \ . "gv:s/^/ /\<CR>:nohlsearch\<CR>" + \ . s:PREV_REPORT + \ . "gv" + + " To drag entire lines upwards... + elseif a:dir == 'up' + let EOF = line('$') + + " Can't drag up if at first line... + if line_left == 1 || line_right == 1 + return 'gv' + + " Needs special handling at EOF (because cursor moves up on delete)... + elseif line_left == EOF || line_right == EOF + let height = line_right - line_left + let select_extra = height ? height . 'j' : "" + return s:NO_REPORT + \ . 'gvxP' + \ . s:PREV_REPORT + \ . 'V' . select_extra + + " Otherwise just cut-move-paste-reselect... + else + let height = line_right - line_left + let select_extra = height ? height . 'j' : "" + return s:NO_REPORT + \ . 'gvxkP' + \ . s:PREV_REPORT + \ . 'V' . select_extra + endif + + " To drag entire lines downwards... + elseif a:dir == 'down' + let EOF = line('$') + + " This is how much extra we're going to have to reselect... + let height = line_right - line_left + let select_extra = height ? height . 'j' : "" + + " Needs special handling at EOF (to push selection down into new space)... + if line_left == EOF || line_right == EOF + return "O\<ESC>gv" + + " Otherwise, just cut-move-paste-reselect... + else + return s:NO_REPORT + \ . 'gvxp' + \ . s:PREV_REPORT + \ . 'V' . select_extra + endif + + endif +endfunction + +" Drag in specified direction in Visual Block mode... +function! s:Drag_Block (dir) + " Clean up the temporary convenience... + nunmap <buffer> M + + " Locate block being shifted... + let [buf_left, line_left, col_left, offset_left ] = getpos("'<") + let [buf_right, line_right, col_right, offset_right] = getpos("'>") + + " Identify special '$' blocks... + let dollar_block = 0 + let start_col = min([col_left+offset_left, col_right+offset_right]) + let end_col = max([col_left+offset_left, col_right+offset_right]) + let visual_width = end_col - start_col + 1 + for visual_line in split(getreg("v"),"\n") + if strlen(visual_line) > visual_width + let dollar_block = 1 + let visual_width = strlen(visual_line) + endif + endfor + let square_up = (dollar_block ? (start_col+visual_width-2).'|' : '') + + " Drag left... + if a:dir == 'left' + "Can't drag left at left margin... + if col_left == 1 || col_right == 1 + return 'gv' + + " Otherwise reposition one column left (and optionally trim any whitespace)... + elseif g:DVB_TrimWS + " May need to be able to temporarily step past EOL... + let prev_ve = &virtualedit + set virtualedit=all + + " Are we moving past other text??? + let square_up_final = "" + if dollar_block + let lines = getline(line_left, line_right) + if match(lines, '^.\{'.(start_col-2).'}\S') >= 0 + let dollar_block = 0 + let square_up_final = (start_col+visual_width-3).'|' + endif + endif + + let vcol = start_col - 2 + return 'gv'.square_up.'xhP' + \ . s:NO_REPORT + \ . "gvhoho:s/\\s*$//\<CR>gv\<ESC>" + \ . ':set virtualedit=' . prev_ve . "\<CR>" + \ . s:PREV_REPORT + \ . ":nohlsearch\<CR>gv" + \ . (dollar_block ? '$' : square_up_final ) + else + return 'gv'.square_up.'xhPgvhoho' + endif + + " Drag right... + elseif a:dir == 'right' + " May need to be able to temporarily step past EOL... + let prev_ve = &virtualedit + set virtualedit=all + + " Reposition block one column to the right... + if g:DVB_TrimWS + let vcol = start_col + return 'gv'.square_up.'xp' + \ . s:NO_REPORT + \ . "gvlolo" + \ . ":s/\\s*$//\<CR>gv\<ESC>" + \ . ':set virtualedit=' . prev_ve . "\<CR>" + \ . s:PREV_REPORT + \ . (dollar_block ? 'gv$' : 'gv') + else + return 'gv'.square_up.'xp:set virtualedit=' . prev_ve . "\<CR>gvlolo" + endif + + " Drag upwards... + elseif a:dir == 'up' + " Can't drag upwards at top margin... + if line_left == 1 || line_right == 1 + return 'gv' + endif + + " May need to be able to temporarily step past EOL... + let prev_ve = &virtualedit + set virtualedit=all + + " If trimming whitespace, jump to just below block to do it... + if g:DVB_TrimWS + let height = line_right - line_left + 1 + return 'gv'.square_up.'xkPgvkoko"vy' + \ . height + \ . 'j:s/\s*$//' + \ . "\<CR>:nohlsearch\<CR>:set virtualedit=" + \ . prev_ve + \ . "\<CR>gv" + \ . (dollar_block ? '$' : '') + + " Otherwise just move and reselect... + else + return 'gv'.square_up.'xkPgvkoko"vy:set virtualedit=' + \ . prev_ve + \ . "\<CR>gv" + \ . (dollar_block ? '$' : '') + endif + + " Drag downwards... + elseif a:dir == 'down' + " May need to be able to temporarily step past EOL... + let prev_ve = &virtualedit + set virtualedit=all + + " If trimming whitespace, move to just above block to do it... + if g:DVB_TrimWS + return 'gv'.square_up.'xjPgvjojo"vyk:s/\s*$//' + \ . "\<CR>:nohlsearch\<CR>:set virtualedit=" + \ . prev_ve + \ . "\<CR>gv" + \ . (dollar_block ? '$' : '') + + " Otherwise just move and reselect... + else + return 'gv'.square_up.'xjPgvjojo"vy' + \ . "\<CR>:set virtualedit=" + \ . prev_ve + \ . "\<CR>gv" + \ . (dollar_block ? '$' : '') + endif + endif +endfunction + + +" Restore previous external compatibility options +let &cpo = s:save_cpo + |