# FakeVim

FakeVim is library to emulate Vim in QTextEdit, QPlainTextEdit and possibly other Qt widgets.

## Build

To build the library and simple example editor (in `example` directory), run
following commands:

    cmake .
    make

Build and run **example with **CMake\*\*:

    cmake -DBUILD_EXAMPLE=1 .
    make
    ./fakevim_example

Build and run **tests with CMake**:

    cmake -DBUILD_TESTS=1 .
    make
    ctest

## Supported Features

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

Here is list of emulated commands with description where it can diverge from Vim in functionality.

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

### 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

## Implementation

There are appropriate signals emitted for command which has to be processed by the underlying editor widget (folds, windows, tabs, command line, messages etc.).
See example in `example/` directory or implementation of FakeVim plugin in Qt Creator IDE.

## Python Bindings

To install Python bindings for FakeVim see "python/README.md" file.

## Update from Upstream

The source code should be regularly updated from the Qt Creator.

To fetch Qt Creator source code:

    git clone "https://codereview.qt-project.org/qt-creator/qt-creator" /path/to/qt-creator

To update FakeVim source code, run:

    utils/update_from_qtc.sh /path/to/qt-creator
