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.bash_profile

#!/bin/bash

# Description:
#   This script is executed for login shells.

#From man bash:
#  When bash is invoked as an interactive login shell, or as a  non-inter‐
#  active  shell with the --login option, it first reads and executes com‐
#  mands from the file /etc/profile, if that file exists.   After  reading
#  that file, it looks for ~/.bash_profile, ~/.bash_login, and ~/.profile,
#  in that order, and reads and executes commands from the first one  that
#  exists  and  is  readable.  The --noprofile option may be used when the
#  shell is started to inhibit this behavior.

# Sources the user's personal profile, bash will not source it as this
# script already exists.
[ -e ~/.profile ] && source ~/.profile

# When  an  interactive  shell that is not a login shell is started, bash
# reads and executes commands from ~/.bashrc, if that file exists.   This
# may  be inhibited by using the --norc option.  The `--rcfile file` option
# will force bash to read and  execute  commands  from `file` instead  of
# ~/.bashrc.

#Sources the rc script
[[ $- == *i* ]] && [ -e ~/.bashrc ] && source ~/.bashrc

.bashrc

#!/usr/bin/env bash

# Just to be safe, if not running interactively, don't do anything
[[ $- != *i* ]] && return

# Note:
# My personal .dotfiles package will source the bashrc script from bash_profile
# for interactive login shells. Login and non-login shells will then be equals.

# Fix for missing .profile sourcing
# shellcheck disable=SC1091
[[ -z "${XDG_DATA_HOME:-}" ]] && . ~/.profile

# ... HERE, ADD ANYTHING FOR THE BASH SHELL
# DON'T do environment manipulations, do those in ~/.profile

.profile

#!/bin/bash

# ~/.profile: executed by the command interpreter for login shells.
# This file is not read by bash(1), if ~/.bash_profile or ~/.bash_login exists.
# see /usr/share/doc/bash/examples/startup-files for examples.
# The files are located in the bash-doc package.

# This file should not have any ill-advised effect when not used with bash.
# This file should be sourced by your .bash_profile otherwise bash will not read it.

# These files are for setting the USER-WIDE environment.

.xsessionrc

#!/bin/bash

# This file is not *as* standard as the others.
#
#   The Debian reference manual describes how the defaults work:
#    1. If the user has a ~/.xsessionrc file, read it.
#    2. If a specific session was selected in gdm3, run it.
#    3. Otherwise, if the user has a ~/.xsession or ~/.Xsession file, run it.
#    ...
# 
# Sources
#    - https://wiki.debian.org/Xsession
#    - https://github.com/sddm/sddm/blob/0ef0df7e7140d182b4df6087692498486de7a094/data/scripts/Xsession#L65

source ~/.profile