====== Cheatsheet ======
  * [[http://rainbow.life.tsinghua.edu.cn/~xuelab/tutorial/vim/vi-vim-cheat-sheet-and-tutorial.pdf | vim cheat sheet and tutorial]]

====== Cookbook ======
  * http://www.oualline.com/vim-cook.html
  * spell check: http://vimdoc.sourceforge.net/htmldoc/spell.html#spell-quickstart
  * mouse copy&paste: http://vim.1045645.n5.nabble.com/How-to-configure-vim-to-use-the-mouse-AND-to-copy-and-paste-td3047221.html
  * expand tabs: http://vim.wikia.com/wiki/Converting_tabs_to_spaces
  * covert between dos/unix format: http://vim.wikia.com/wiki/File_format#cite_note-broken-0

====== Trouble Shooting ======
===== How to change file format and remove dos line endlings =====
  * If your vim show "[dos]" on the bottom, you can change it by
<code>
:e ++ff=unix
# similar commands include
:e ++ff=dos
:e ++ff=mac
</code>

  * To remove ^M
<code>
:%s/^M//g
# will do it if you use Ctrl-v Ctrl-m to input the ^M
</code>
===== How to change default font in windows =====
  * In C:\Users\<username>\_vimrc: [[https://superuser.com/questions/364792/how-can-i-set-the-default-font-for-gvim-on-windows | ref]]

(The # shall be removed.)
<code>
if has("gui_kde")
    #set guifont=Consolas/13/-1/5/50/0/0/0/0/0
elseif has("gui_gtk")
    #set guifont=Consolas\ 13
elseif has("gui_running")
    if has("win32") || has("win64")
        #set guifont=Consolas:h12
    else
        #set guifont=-xos4-terminus-medium-r-normal--14-140-72-72-c-80-iso8859-1
    endif
endif
</code>

===== How to enable ctrl+c/ctrl+v/ctrl+a etc in windows =====
  * Add "source $VIMRUNTIME/mswin.vim" into C:\Users\yxue\_vimrc

<markdown>
# Tricks

## Vertical rulers on a specific column

[Setup a Ruler on a Specific Column in Vim | Baeldung on Linux](https://www.baeldung.com/linux/vim-ruler-on-specific-column)

In python's [PEP 8](https://peps.python.org/pep-0008/), the maximum line length is limited to 79 (and docstrings/comments to 72). So a vertical indication line is necessary.

You can add a vertical ruler by typing:
```
:set colorcolumn=72,80
```
The line's color can be adjusted, `ctermbg` for vim called from terminal while `guibg` for vim called from GUI (which is gvim)
```
:highlight colorcolumn ctermbg=lightgrey guibg=lightgrey
```

The two lines can be added to `~/.vimrc` for automatic loading. (The # shall be removed.)
```
#set colorcolumn=72,80
highlight colorcolumn ctermbg=lightgrey guibg=lightgrey
```
</markdown>