Lem SDL2

Note: the SDL2 UI is deprecated in favor of the Webview one. It won’t receive updates.

Lem has nightly releases (Linux AppImages, MacOS and Windows binaries), but not for the SDL2 GUI.

Dependencies:

• sbcl
• sdl2
• qlot
• git

• Debian-like distro

sudo apt install sbcl build-essential libsdl2-dev libsdl2-image-dev libsdl2-ttf-dev fd-find

• Fedora-like distro

sudo dnf install sbcl SDL2-devel SDL2_image-devel SDL2_ttf-devel fd-find
sudo dnf group install c-development development-tools

• Automatic installer

curl -L https://qlot.tech/installer | bash

Note: For an alternative installation, see https://github.com/fukamachi/qlot#installation

There are two ways to install Lem:

1. Local installation:

mkdir $HOME/common-lisp
cd $HOME/common-lisp
git clone https://github.com/lem-project/lem.git
cd lem && make sdl2

Note: You can also run make sdl2-ncurses to build Lem with both the SDL2 and ncurses interfaces. You can then choose the interface at startup with -i / --interface, either “sdl2” or “ncurses”.

Then add the executable to your PATH by adding this line to your ~/.bashrc:

export PATH="$HOME/common-lisp/lem:$PATH"

2. System-wide installation:

git clone https://github.com/lem-project/lem.git
cd lem

First ensure qlot is installed for the root user:

sudo bash -c "curl -L https://qlot.tech/installer | bash"

Then install Lem:

sudo make install

This will:

• Build Lem with both SDL2 and ncurses interfaces
• Install the executable system-wide
• Add a desktop entry file with relevant file associations
• Configure SDL2 as the default interface

You can still switch between interfaces using the -i / --interface option when launching Lem.

Copy the app file to the applications folder and type the following in your terminal:

xattr -d com.apple.quarantine /Applications/lem.app

To create an executable that you can run as a GUI you will need to use Automator.

• Launch Automator
• Choose ‘Application’ as the type for your document

You should now see three columns. In the second column there will be a collection of actions that you can run in this ‘application’. Scroll down until you see Run Shell Script. Double click on this and on the right you should now see a text box where you can enter your script:

Replace the contents of this shell script with the following:

source ~/.zshrc
cd ~/common-lisp/lem
./lem -i sdl2 &
exit 0

Save this as an application (this should be the default) with the name Lem to \Applications.

You should now be abel to run this as an application from the Applications folder.

If your keyboard is a JIS layout, you need to put the following settings in $HOME/.lem/init.lisp

#+lem-sdl2
(lem-sdl2:set-keyboard-layout :jis)