nixos-configs/modules/bashrc

# Set the title bar to user@host: pwd
_TITLE_BAR="\u@\h: \w"
_SET_TITLE_BAR="\[\e]0;$_TITLE_BAR\a\]"
# Shorten $HOME to ~ in PWD and shorten other path dir names to one letter
_pwd() {
	if [[ "$PWD" =~ ^"$HOME"($) ]]; then
		printf "~"
	elif [[ "$PWD" = "/" ]]; then
		printf "/"
	else
		if [[ "$PWD" =~ ^"$HOME"/ ]]; then
			printf "~"
			DIR="${PWD#$HOME}"
		else
			DIR="$PWD"
		fi
		for path_elem in $(dirname "$DIR" | tr / '\n' | grep . | cut -c-1); do
			printf '/%s' $path_elem
		done
		printf "/$(basename "$DIR")"
	fi
}
_DIR='$(_pwd)'
# Color codes
_GREEN="\[\033[32;1m\]"
_DIM="\[\e[32;2m\]"
_OLIVE="\[\e[33;2m\]"
_RESET="\[\e[0m\]"
_HOST=$(if [ -z "$SSH_CLIENT" ]; then echo $_DIM; else echo $_OLIVE; fi)
# Nested shell level
_SHLVL=$(printf '\$%.0s' $(seq 1 $SHLVL))
# SSH detection
_SSH='$([ ! -z "$SSH_CLIENT" ] && echo "=>")'
# Build prompt
export PS1="$_SET_TITLE_BAR$_DIM[\A \u@$_RESET$_HOST\h$_DIM:$_RESET$_GREEN$_DIR$_RESET$_DIM]$_SHLVL$_RESET "

export HISTCONTROL=ignoreboth

# Suppress ssh completion from /etc/hosts
# This used to be COMP_KNOWN_HOSTS_WITH_HOSTFILE so most search results refer to it under that name
# This is necessary to avoid StevenBlack blocks appearing in ssh tab completions
export BASH_COMPLETION_KNOWN_HOSTS_WITH_HOSTFILE=