nixos-config/static/bash/bash.helpers

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2021-01-15 10:26:39 -08:00
#!/usr/bin/env bash
function __makeTerminalTitle() {
local title=''
local CURRENT_DIR="${PWD/#$HOME/\~}"
if [ -n "${SSH_CONNECTION}" ] || [ $UID -eq 0 ]; then
title+="`hostname`:${CURRENT_DIR} [`whoami`@`hostname -f`]"
else
title+="${CURRENT_DIR} [`whoami`]"
fi
echo -en '\033]2;'${title}'\007'
}
function __getMachineId() {
if [ -f /etc/machine-id ]; then
echo $((0x$(cat /etc/machine-id | head -c 15)))
elif [ -x "$(which hostid 2>&1)" ]; then
echo $(( (${#HOSTNAME}+0x$(hostid))))
else
echo "00000000"
fi
}
function __makePS1() {
local EXIT="$?"
if [ ! -n "${HOST_COLOR}" ]; then
local H=$(__getMachineId)
HOST_COLOR=$(tput setaf $((H%5 + 2))) # foreground
fi
PS1=''
if [ ${USER} == root ]; then
PS1+="\[${Red}\]" # root
elif [ ${USER} != ${LOGNAME} ]; then
PS1+="\[${Blue}\]" # normal user
else
PS1+="\[${Green}\]" # normal user
fi
PS1+="\u\[${Color_Off}\]"
if [ -n "${SSH_CONNECTION}" ] || [ $UID -eq 0 ]; then
PS1+="\[${Purple}\]@\[${Color_Off}\]"
PS1+="\[${UWhite}${HOST_COLOR}\]\h\[${Color_Off}\]" # host displayed only if ssh connection
fi
PS1+="\[${Purple}\]:\w" # working directory
# screen sessions
local SCREEN_PATHS="/var/run/screens/S-`whoami` /var/run/screen/S-`whoami` /var/run/uscreens/S-`whoami`"
for screen_path in ${SCREEN_PATHS}; do
if [ -d ${screen_path} ]; then
SCREEN_JOBS=`ls ${screen_path} | wc -w`
if [ ${SCREEN_JOBS} != 0 ]; then
local current_screen="$(echo ${STY} | cut -d '.' -f 1)"
if [ -n "${current_screen}" ]; then
current_screen=":${current_screen}"
fi
PS1+=" \[${BGreen}\][s${SCREEN_JOBS}${current_screen}]\[${Color_Off}\]"
fi
break
fi
done
# git branch
if [ -x "`which git 2>&1`" ]; then
local branch="$(git name-rev --name-only HEAD 2>/dev/null)"
if [ -n "${branch}" ]; then
local git_status="$(git status --porcelain -b 2>/dev/null)"
local letters="$( echo "${git_status}" | grep --regexp=' \w ' | sed -e 's/^\s\?\(\w\)\s.*$/\1/' )"
local untracked="$( echo "${git_status}" | grep -F '?? ' | sed -e 's/^\?\(\?\)\s.*$/\1/' )"
local status_line="$( echo -e "${letters}\n${untracked}" | sort | uniq | tr -d '[:space:]' )"
PS1+=" \[${Blue}\](git: ${branch}"
if [ -n "${status_line}" ]; then
PS1+=" ${status_line}"
fi
PS1+=")\[${Color_Off}\]"
fi
fi
PS1+="\n"
# exit code
if [ ${EXIT} != 0 ]; then
PS1+="\[${BRed}\][!${EXIT}]\[${Color_Off}\]"
else
PS1+="\[${Green}\][${EXIT}]\[${Color_Off}\]"
fi
PS1+="\[${Purple}\]->\[${Color_Off}\] " # prompt
__makeTerminalTitle
}