Code Edit

Tab Width

The width (number of characters) of an indent. It is used when displaying the tab characters. It is also used in Auto Indent and Replace tabs by spaces .

Cursor Width

The width of the text cursor in pixels.

Auto Indent

1. When you start a new line, the new line will have the same indent (i.e. white spaces at the beginning of the line) as the old line.
2. If the old line ends with {, an extra indent (a tab character or Tab Width spaces, depending on whether Replace tabs by spaces is enabled) will be inserted at the beginning of the new line.

Wrap Text

If a line is too long to fit in a single line, the line will be separated into several lines.

Auto Complete Parentheses

Automatically add the right parenthesis when you type the left one. For example, when you type (, ) will be added.

When the character next to the cursor is a right parenthesis and you type this parenthesis, instead of typing this parenthesis, the cursor will jump out of the parenthesis.

You can choose the parentheses to auto-complete in the Parentheses settings.

Auto Remove Parentheses

When you delete a left parenthesis, if a corresponding right parenthesis is next to it, the right parenthesis will also be deleted.

You can choose the parentheses to auto-remove in the Parentheses settings.

Jump out of a parenthesis by pressing Tab

When the cursor is next to a right parenthesis, you can use the Tab key to jump out of it. If Auto Complete Parentheses is enabled, this is an alternative of typing the right parenthesis.

You can choose the parentheses to jump out by Tab in the Parentheses settings.

Replace tabs by spaces

When you insert an indent, insert spaces instead of a tab character. The number of spaces is equal to the Tab Width .

Note that this won’t replace the existing tab characters. In Auto Indent , the tab characters in the old line will remain in the new line (however, the new indent inserted after { will be spaces).

Enable Vim emulation

If enabled, the code editor will emulate vim behaviour. In vim emulation, control keys such as Ctrl+N will be handled by the vim layer instead of CP Editor’s default key bindings. We provide some custom commands that can perform various tasks like opening new tabs, running test cases, etc. Here is a list of all supported custom vim commands.

Vim Configuration

The configuration to use in vim mode. The list of all supported vim commands is here .

Vim Commands

Supported Features

Most supported commands can be followed by a motion command or executed in visual mode, work with registers, or be prefixed with a number of repetitions.

Here is a list of emulated commands with notes where behaviour can diverge from Vim.

Modes

• normal
• insert and replace
• visual
• command line (:)

Normal and Visual Modes

• basic movement – h/j/k/l, <C-U>, <C-D>, <C-F>, <C-B>, gg, G, 0, ^, $ etc.
• word movement – w, e, b etc.
• “inner/a” movement – ciw, 3daw, ya{ etc.
• f, t movement
• [, ] movement
• {, } – paragraph movement
• delete/change/yank/paste with register
• undo/redo
• <C-A>, <C-X> – increase or decrease number in decimal/octal/hexadecimal format (e.g. 128<C-A> on or before “0x0ff” changes it to “0x17f”)
• . – repeat last change
• /search, ?search, *, #, n, N – most of the regular expression syntax used in Vim is supported; \< and \> are equivalent to \b
• @, q (macro recording, execution) – special keys are saved as <S-Left>
• marks
• gv – last visual selection; can differ if text is edited around it
• indentation – =, <<, >> etc. with movement, count and in visual mode
• “to upper/lower” – ~, gU, gu etc.
• i, a, o, I, A, O – enter insert mode
• scroll window – zt, zb, zz etc.
• wrap line movement – gj, gk, g0, g^, g$

Command Line Mode

• :map, :unmap, :inoremap etc.
• :source – very basic line-by-line sourcing of vimrc files
• :substitute – substitute expression in range
• :'<,'>!cmd – filter through an external command (e.g. sort lines in file with :%!sort)
• :.!cmd – insert standard output of an external command
• :read
• :yank, :delete, :change
• :move, :join
• :20 – go to address
• :history
• :registers, :display
• :nohlsearch
• :undo, :redo
• :normal
• :<, :>

Insert Mode

• <C-O> – execute single command and return to insert mode
• <C-V> – insert raw character
• <insert> – toggle replace mode

Options (:set …)

• autoindent
• clipboard
• backspace
• expandtab
• hlsearch
• ignorecase
• incsearch
• indent
• iskeyword
• scrolloff
• shiftwidth
• showcmd
• smartcase
• smartindent
• smarttab
• startofline
• tabstop
• tildeop
• wrapscan

Example Vimrc

" highlight matched
set hlsearch
" case insensitive search
set ignorecase
set smartcase
" search while typing
set incsearch
" wrap-around when searching
set wrapscan
" show pressed keys in lower right corner
set showcmd
" tab -> spaces
set expandtab
set tabstop=4
set shiftwidth=4
" keep a 5 line buffer for the cursor from top/bottom of window
set scrolloff=5
" X11 clipboard
set clipboard=unnamed
" use ~ with movement
set tildeop
" mappings
nnoremap ; :
inoremap jj <Esc>
" clear highlighted search term on space
noremap <silent> <Space> :nohls<CR>
" reselect visual block after indent
vnoremap < <gv
vnoremap > >gv
" MOVE LINE/BLOCK
nnoremap <C-S-J> :m+<CR>==
nnoremap <C-S-K> :m-2<CR>==
inoremap <C-S-J> <Esc>:m+<CR>==gi
inoremap <C-S-K> <Esc>:m-2<CR>==gi
vnoremap <C-S-J> :m'>+<CR>gv=gv
vnoremap <C-S-K> :m-2<CR>gv=gv

Custom Vim commands

In this section we present a list of all custom vim commands supported in CP Editor.