Moving lines up or down in a file

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#UP #vim #J#

本文介绍了一种在Vim编辑器中高效移动文本行的方法，通过设置自定义快捷键，可以在正常模式、插入模式及可视模式下轻松地将当前行或选中的多行文本上下移动，并自动调整缩进。

Moving lines up or down in a file

From Vim Tips Wiki

Tip 646 Previous Next created 2004 · complexity basic · author Frank Butler · version 6.0

The following mappings in your vimrc provide a quick way to move lines of text up or down. The mappings work in normal, insert and visual modes, allowing you to move the current line or a selected block of lines.

nnoremap <M-j> mz:m+<CR>`z==
nnoremap <M-k> mz:m-2<CR>`z==
inoremap <M-j> <Esc>:m+<CR>==gi
inoremap <M-k> <Esc>:m-2<CR>==gi
vnoremap <M-j> :m'>+<CR>gv=`<my`>mzgv`yo`z
vnoremap <M-k> :m'<-2<CR>gv=`>my`<mzgv`yo`z

Press Alt-j to move the current line down, or press Alt-k to move the current line up. The == re-indents the line to suit its new position.

Explanation

The command :m 5 moves the current line to below line 5. If the number starts with + or -, it is relative to the current line, so :m +5 moves the current line down by 5 lines (+5 is interpreted as .+5 where . means the current line). The space after :m is not required, and the +1 can be written as + (the 1 is assumed).

Comments

TO DO

A quick test shows that this is very nice, and if polished, it could be a featured tip.
Why does it use a mark? I only tried the normal-mode mapping, but it seemed to work fine with the mz and `z removed.
Need to improve my above explanation.