It is about how to get colorized less output for source code.
This howto is written with respect to Ubuntu 17.10.
1) Install source-highlight
sudo apt-get install source-highlight
2) Look for lesspipe
dpkg -L libsource-highlight-common | grep lesspipe
My one is in /usr/share/source-highlight/ folder
3) add two following lines in your .bashrc
export LESSOPEN="| /usr/share/source-highlight/src-hilite-lesspipe.sh %s"
export LESS=' -R '