app-shells/bash/files/bashrc.d: files from ::gentoo

Signed-off-by: Alarig Le Lay <alarig@swordarmor.fr>

app-shells/bash/files/bashrc.d/10-gentoo-color.bash

@@ -34,7 +34,8 @@ elif (( gentoo_color == 16777216 )); then
 	export COLORTERM=truecolor
 fi
 
-if (( gentoo_color <= 0 )) || ! genfun_has_readline; then
+# For direxpand to be missing indicates that bash is lacking readline support.
+if (( gentoo_color <= 0 )) || [[ ! $(shopt -p direxpand 2>/dev/null) ]]; then
 	# Define a prompt without color.
 	PS1='\u@\h \w \$ '
 elif (( EUID == 0 )); then

app-shells/bash/files/bashrc.d/10-gentoo-title.bash

@@ -1,41 +1,41 @@
 # /etc/bash/bashrc.d/10-gentoo-title.bash
 
-# Set window title with the Title Definition String sequence. For screen, the
-# sequence defines the window title (%t) and for tmux, the pane_title (#T).
-# For tmux to be affected requires that its allow-rename option be enabled.
-# https://www.gnu.org/software/screen/manual/html_node/Control-Sequences.html
-case ${TERM} in
-	screen*|tmux*)
-		genfun_set_pane_title() {
-			printf '\033k%s\033\\' "${HOSTNAME%%.*}"
-		}
-		PROMPT_COMMAND+=('genfun_set_pane_title')
-		;;
-	*)
-		# If the TTY is that of sshd(8) then proceed no further. Alas,
-		# there exist many operating environments in which the window
-		# title would otherwise not be restored upon ssh(1) exiting.
-		if [[ ${SSH_TTY} && ${SSH_TTY} == "$(tty)" ]]; then
-			return
-		fi
-esac
-
-# Assigns the basename of the current working directory, having sanitised it
-# with @Q parameter expansion. Useful for paths containing newlines and such.
-# As a special case, names consisting entirely of graphemes shall not undergo
-# the parameter expansion, for reasons of cleanliness.
-genfun_sanitise_cwd() {
+genfun_set_win_title() {
+	# Assigns the basename of the current working directory, having
+	# sanitised it with @Q parameter expansion. Useful for paths containing
+	# newlines and such. As a special case, names consisting entirely of
+	# graphemes shall not undergo the expansion, for reasons of cleanliness.
+	genfun_sanitise_cwd() {
 		_cwd=${PWD##*/}
 		if [[ ! ${_cwd} ]]; then
 			_cwd=${PWD}
 		elif [[ ${_cwd} == *[![:graph:]]* ]]; then
 			_cwd=${_cwd@Q}
 		fi
+	}
+
+	# Sets the window title with the Set Text Parameters sequence. For
+	# screen, the sequence defines the hardstatus (%h) and for tmux, the
+	# pane_title (#T). For graphical terminal emulators, it is normal for
+	# the title bar to be affected.
+	genfun_set_win_title() {
+		genfun_sanitise_cwd
+		printf '\033]0;%s@%s - %s\007' "${USER}" "${HOSTNAME%%.*}" "${_cwd}"
+	}
+
+	genfun_set_win_title
 }
 
-# Set window title with the Set Text Parameters sequence. For screen, the
-# sequence defines the hardstatus (%h) and for tmux, the window_name (#W).
-# For graphical terminal emulators, it is normal for the title bar be affected.
+# Proceed no further if the TTY is that of sshd(8) and if not running a terminal
+# multiplexer. Alas, there exist many operating environments in which the window
+# title would otherwise not be restored upon ssh(1) exiting. Those who wish for
+# the title to be set unconditionally may adjust ~/.bashrc - or create a custom
+# bashrc.d drop-in - to define PROMPT_COMMAND=(genfun_set_win_title).
+if [[ ${SSH_TTY} && ${TERM} != @(screen|tmux)* && ${SSH_TTY} == "$(tty)" ]]; then
+	return
+fi
+
+# Determine whether the terminal can handle the Set Text Parameters sequence.
 # The only terminals permitted here are those for which there is empirical
 # evidence that the sequence is supported and that the UTF-8 character encoding
 # is handled correctly. Quite rightly, this precludes many vintage terminals.
@@ -48,9 +48,5 @@ case ${TERM} in
 	st-256color   |\
 	tmux*         |\
 	xterm*        )
-		genfun_set_win_title() {
-			genfun_sanitise_cwd
-			printf '\033]2;%s@%s - %s\007' "${USER}" "${HOSTNAME%%.*}" "${_cwd}"
-		}
 		PROMPT_COMMAND+=('genfun_set_win_title')
 esac

app-shells/bash/files/bashrc.d/15-gentoo-bashrc-check.bash

@@ -0,0 +1,24 @@
+# /etc/bash/bashrc.d/15-gentoo-bashrc-check.bash
+
+# Some users have ~/.bashrc as a copy of ${FILESDIR}/bashrc which either matches
+# exactly or is only trivially modified. Such is an improper state of affairs
+# and results in the bashrc.d drop-ins being sourced twice. Warn them that they
+# should use the skeleton file instead. This drop-in should be removed no sooner
+# than one year from the date of its introduction.
+
+if [[ -e ${TMPDIR:-/tmp}/.gentoo-bashrc-check-${EUID} || ! -f ~/.bashrc ]]; then
+	return
+fi
+
+{
+	if grep -qxF 'for sh in /etc/bash/bashrc.d/* ; do' -- ~/.bashrc; then
+		cat >&3 <<'EOF'
+WARNING! Your ~/.bashrc file is based on an old copy of /etc/bash/bashrc, which
+is not intended for use within a home directory. Please either delete ~/.bashrc
+or replace it with a copy of /etc/skel/.bashrc before optionally customizing it
+further. Neglecting to do so may result in bash behaving unexpectedly.
+
+EOF
+	fi
+	touch -- "${TMPDIR:-/tmp}/.gentoo-bashrc-check-${EUID}"
+} 3>&2 2>/dev/null