ewig is a simple text editor (an Ersatz Emacs) written using immutable data-structures in C++.
The code is written in a simple style to showcase a value-based functional architecture. We invite you to study the code. Learn more in the CppCon'17 Talk: Postmodern Immutable Data Structures.
This project is part of a long-term vision helping interactive and concurrent C++ programs become easier to write. Help this project's long term sustainability by becoming a patron or buying a sponsorship package: [email protected]
Try it out
If you are using the Nix package manager (we strongly recommend it) you can just install the software with.
nix-env -if https://github.com/arximboldi/ewig/archive/master.tar.gz
Development
To build the code you need a C++17 compiler, cmake, and ncurses
with unicode support (package libncursesw5-dev in Debian and
friends).
You can install those manually, but the easiest way to get a development environment up and running is by using the Nix package manager. At the root of the repository just type:
nix-shell
This will download all required dependencies and create an isolated environment in which you can use these dependencies, without polluting your system.
Then you can generate a development project using CMake.
mkdir build && cd build
cmake ..
To configure an optimized build and compile do:
cmake .. -DCMAKE_BUILD_TYPE=Release
make
To install the compiled software globally:
sudo make install
Keybindings
Excerpt from
main.cpp:
const auto key_map_emacs = make_key_map(
{
{key::seq(key::ctrl('p')), "move-up"},
{key::seq(key::up), "move-up"},
{key::seq(key::down), "move-down"},
{key::seq(key::ctrl('n')), "move-down"},
{key::seq(key::ctrl('b')), "move-left"},
{key::seq(key::left), "move-left"},
{key::seq(key::ctrl('f')), "move-right"},
{key::seq(key::right), "move-right"},
{key::seq(key::page_down), "page-down"},
{key::seq(key::page_up), "page-up"},
{key::seq(key::backspace), "delete-char"},
{key::seq(key::backspace_),"delete-char"},
{key::seq(key::delete_), "delete-char-right"},
{key::seq(key::home), "move-beginning-of-line"},
{key::seq(key::ctrl('a')), "move-beginning-of-line"},
{key::seq(key::end), "move-end-of-line"},
{key::seq(key::ctrl('e')), "move-end-of-line"},
{key::seq(key::ctrl('i')), "insert-tab"}, // tab
{key::seq(key::ctrl('j')), "new-line"}, // enter
{key::seq(key::ctrl('k')), "kill-line"},
{key::seq(key::ctrl('w')), "cut"},
{key::seq(key::ctrl('y')), "paste"},
{key::seq(key::ctrl('@')), "start-selection"}, // ctrl-space
{key::seq(key::ctrl('_')), "undo"},
{key::seq(key::ctrl('x'), key::ctrl('C')), "quit"},
{key::seq(key::ctrl('x'), key::ctrl('S')), "save"},
{key::seq(key::ctrl('x'), 'h'), "select-whole-buffer"},
{key::seq(key::ctrl('x'), '['), "move-beginning-buffer"},
{key::seq(key::ctrl('x'), ']'), "move-end-buffer"},
{key::seq(key::alt('w')), "copy"},
});License
This software is licensed under the GPLv3 license.
Copyright (C) 2016 Juan Pedro Bolivar Puente
This file is part of ewig.
ewig is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
ewig is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with ewig. If not, see <http://www.gnu.org/licenses/>.
