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profiles/base/.bashrc.d/10-gentoo-color-r2.bash

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+#!/usr/bin/env bash
+# copied from https://gitweb.gentoo.org/repo/gentoo.git/tree/app-shells/bash
+
+if [[ ${NO_COLOR} ]]; then
+	# Respect the user's wish not to use color. See https://no-color.org/.
+	gentoo_color=0
+elif [[ ${COLORTERM@a} == *x* && ${COLORTERM} == @(24bit|truecolor) ]]; then
+	# The COLORTERM environment variable can reasonably be trusted here.
+	# See https://github.com/termstandard/colors for further information.
+	gentoo_color=1
+else
+	# Check TERM against a whitelist covering a majority of popular
+	# terminal emulators and virtual console implementations known to
+	# support color. If no matching entry is found, try to use tput(1) to
+	# determine whether color is supported.
+	case ${TERM} in
+		*color*    |\
+		*direct*   |\
+		*ghostty   |\
+		[Ekx]term* |\
+		alacritty  |\
+		aterm      |\
+		contour    |\
+		dtterm     |\
+		foot*      |\
+		jfbterm    |\
+		linux      |\
+		mlterm     |\
+		rxvt*      |\
+		screen*    |\
+		tmux*      |\
+		wsvt25*    ) gentoo_color=1 ;;
+		*          ) gentoo_color=$(tput colors 2>/dev/null)
+	esac
+fi
+
+# For direxpand to be missing indicates that bash is lacking readline support.
+prompt_exit_code() {
+	local -r exit_code=$?
+	if [[ ${exit_code} -ne 0 ]]; then
+		printf "%s " "${exit_code}"
+	fi
+}
+
+if (( gentoo_color <= 0 )) || ( ! shopt -u direxpand 2>/dev/null ); then
+	# Define a prompt without color.
+	PS1='\u@\h \w \$ '
+elif (( EUID == 0 )); then
+	# If root, omit the username and print the hostname in red.
+	PS1='\[\e[01;31m\]\h\[\e[01;34m\] \w \$\[\e[00m\] '
+else
+	# Otherwise, print the username and hostname in green.
+	PS1='\[\e[01;32m\]\u@\h\[\e[01;34m\] \[\e[01;31m\]$(prompt_exit_code)\[\e[01;34m\]\w \$\[\e[00m\] '
+fi
+
+if (( gentoo_color > 0 )); then
+	# Colorize the output of diff(1), grep(1) and a few coreutils utilities.
+	# However, do so only where no alias/function by the given name exists.
+	for _ in diff dir grep ls vdir; do
+		if [[ $(type -t "$_") == file ]]; then
+			alias "$_=$_ --color=auto"
+		fi
+	done
+
+	# Enable colors for ls(1) and some other utilities that respect the
+	# LS_COLORS variable. Prefer ~/.dir_colors, per bug #64489.
+	if hash dircolors 2>/dev/null; then
+		if [[ -f ~/.dir_colors ]]; then
+			eval "$(COLORTERM=1 dircolors -b -- ~/.dir_colors)"
+		elif [[ -f /etc/DIR_COLORS ]]; then
+			eval "$(COLORTERM=1 dircolors -b /etc/DIR_COLORS)"
+		else
+			eval "$(COLORTERM=1 dircolors -b)"
+		fi
+	fi
+fi
+
+unset -v gentoo_color