My sshrc dofile to carry a custom bash prompt to remote *nix with ssh/mosh access.

hiwaysshrc.sh

#!/usr/bin/env bash
##
##  hiwaysshrc.sh
##  --------------------------------------------------
##  
##  Install:
##
##      $ ln -s $(pwd)/hiwaysshrc.sh ~/.sshrc
##      $ echo "source ~/.sshrc" >> ~/.bash_profile
##
##  --------------------------------------------------
##  Requires: 
##    https://github.com/Russell91/sshrc
##


## Uncomment the next line to enable debug mode.
# set -x


## User settings
## --------------------------------------------------

# Set your preferred timezone here.
export TZ="Asia/Kolkata"

## Aliases
## --------------------------------------------------

# Original commands are accessible
# by prefixing the alias with a backslash (ex: $ \ssh ).
alias ssh="sshrc"
alias mosh="moshrc"
alias sudp="sudo_with_prompt"  # think "sudo -s"

# Navigation
alias cds="cd ~/source/"
alias cdsc="cd ~/source/community"

# Development
alias ggf="git clone"  # Git clone. 
alias ggs="git clone --depth 1"  # Shallow git clone.


## Shortcuts
## --------------------------------------------------

alias l="ls -cAGt"
alias ll="ls -cAGtl"
alias llg="ls -cAGtl|grep"


## Defaults and automatic settings
## --------------------------------------------------

SSHRC="$BASH_SOURCE"
USER_ID=$( id -ur )


## Text / Strings Helper Functions
## --------------------------------------------------

function text_case_lower { tr '[A-Z]' '[a-z]'; }
function text_case_upper { tr '[a-z]' '[A-Z]'; }


## ANSI formatting codes
## --------------------------------------------------
# ANSI support is limited in tput on FreeBSD.
# Prefer raw codes.

ansi_reset="\033[0;0m"
ansi_fmt_superuser="\033[7;8m\033[31;47m"
ansi_fmt_hostname="\033[0;34m"
ansi_fmt_icons="\033[2;30m"
ansi_fmt_clock="\033[0;34m"
ansi_fmt_workdir="\033[3;3m\033[26;47m"
ansi_fmt_prompt_char="\033[0;38m"
ansi_fmt_prompt_char_root="\033[0;31m"


## Shell Helper Functions
## --------------------------------------------------

function previous_command_exit_status {
	local _exit_status="$?"
	if [ $_exit_status -eq 0 ]; then
		echo -n "";
	else
		echo -n "$ansi_fmt_superuser$_exit_status$ansi_reset";
	fi
}

function sudo_with_prompt {
  \sudo bash --rcfile $SSHRC
}

function mkurl-scp {
  # expects a single filename as argument.
  echo "scp $( whoami )@$( hostname ):$( pwd )/$1 ./$1"
}


## Prompt
## --------------------------------------------------

function format_identity {
	if [ $1 -eq 0 ]; then
		echo -n "$ansi_fmt_superuser$2$ansi_reset@$ansi_fmt_hostname$3$ansi_reset";
	else
		echo -n "$2$ansi_reset@$ansi_fmt_hostname$3$ansi_reset"
	fi
}

function format_clock {
	# Latest Unicode emoji may not work with mosh and hence moshrc.
	# See: https://github.com/mobile-shell/mosh/issues/234
  #	echo -n "🇮🇳 $ansi_fmt_clock$_time_tz$ansi_reset"

  # Using codepoints that work through mosh:
  echo -n "$ansi_fmt_icons"
	echo -n "☗ $ansi_fmt_clock\D{%H:%M}$ansi_reset"
}


function format_utc_clock {
	# Latest Unicode emoji may not work with mosh and hence moshrc.
	# See: https://github.com/mobile-shell/mosh/issues/234
  # echo -n "🌍 $ansi_fmt_clock$( date -u +%H:%M )$ansi_reset"

  # Using codepoints that work through mosh:
  echo -n "$ansi_fmt_icons"
  echo -n "☯ $ansi_fmt_clock$( date -u +%H:%M )$ansi_reset"
}


function format_pwd {
	local _pwd="\w"
	echo -n "$ansi_fmt_workdir$_pwd$ansi_reset"
}

function format_prompt_char {
	if [ $1 -eq 0 ]; then
		echo -n "$ansi_fmt_prompt_char_root# $ansi_reset";
	else
		echo -n "$ansi_fmt_prompt_char$ $ansi_reset";
	fi
}

function format_prompt {
	# We first store previous command's exit status, 
	# then run other commands, since executing any command
	# before capturing this variable will overwrite it!
	local _prev_exit_status="$( previous_command_exit_status )"

	local _username="\u"
	local _hostname="$( hostname -s | text_case_lower )"

	local _clock="$( format_clock ) $( format_utc_clock )"
 	local _identity="$( format_identity $USER_ID $_username $_hostname )"
 	local _working_directory="$( format_pwd )"
 	
	# Compose the prompt
	local _prompt_line_1="$_prev_exit_status"
	local _prompt_line_2="$_clock $_identity:$_working_directory"
	local _prompt_char="$(format_prompt_char $USER_ID)"

  # Echo prompt to allow `prompt_command` to grab the output
  # and set as PS1.
	echo "$_prompt_line_1\r\n$_prompt_line_2\r\n$_prompt_char"
}

function prompt_command {
  PS1="$(format_prompt)"
}

# `prompt_command` will be called when a bash prompt
# is about to be displayed. This works for user shell,
# however doen not work if you initiate a sudo shell.
# See `sudo_with_prompt` under aliases for workaround.
PROMPT_COMMAND=prompt_command