xinit: Add .profile

This is for cases when xinirc is not appropriate.

xinit/.profile

@@ -0,0 +1,57 @@
+# .profile --- Initialisation script for display managers.
+#
+# Copyright (c) 2020 Protesilaos Stavrou <info@protesilaos.com>
+#
+# This program is free software; you can redistribute it and/or
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+#
+## Commentary:
+#
+# This script is read by a graphical display manager when logging into
+# the session.  It is conceptually similar to `.xinitrc' and I am
+# considering it as practically equivalent to it for the ordinary
+# functioning of my custom desktop session.  Refer to my dotfiles for
+# the specifics: https://gitlab.com/protesilaos/dotfiles
+
+
+###############
+# Shell setup #
+###############
+
+# Source my bashrc.
+if [ -n "$BASH_VERSION" ]; then
+    if [ -f "$HOME"/.bashrc ]; then
+        source "$HOME"/.bashrc
+    fi
+fi
+
+# Set PATH so it includes user's private executables.
+if [ -d "$HOME"/bin ]; then
+    PATH=$PATH:"$HOME"/bin
+fi
+
+# This is another possible location for user-specific binaries.
+if [ -d "$HOME"/.local/bin ]; then
+    PATH=$PATH:"$HOME"/.local/bin
+fi
+
+##########################
+# Environment essentials #
+##########################
+
+# Auto unlocks the GPG and SSH agents.
+eval $(/usr/bin/gnome-keyring-daemon --start --components=pkcs11,secrets,ssh)
+export SSH_AUTH_SOCK
+
+# Load my XTerm and relevant configurations.
+[ -f "$HOME"/.Xresources ] && xrdb -I "$HOME" -merge "$HOME"/.Xresources