.bash_prompt

#!/usr/bin/env bash
#
# Sexier bash prompt by Amerzel
# https://github.com/Amerzel/sexy-bash-prompt
# Forked from https://github.com/twolfson/sexy-bash-prompt

# If we are on a colored terminal
if tput setaf 1 &> /dev/null; then
  # Reset the shell from our `if` check
  tput sgr0 &> /dev/null

  # If you would like to customize your colors, use
  # # Attribution: http://linuxtidbits.wordpress.com/2008/08/11/output-color-on-bash-scripts/
  # for i in $(seq 0 $(tput colors)); do
  #   echo " $(tput setaf $i)Text$(tput sgr0) $(tput bold)$(tput setaf $i)Text$(tput sgr0) $(tput sgr 0 1)$(tput setaf $i)Text$(tput sgr0)  \$(tput setaf $i)"
  # done

  # If the terminal supports at least 256 colors, write out our 256 color based set
  if [[ $(tput colors) -ge 256 ]] &> /dev/null; then
    ROOT_USER_COLOR=$(tput setaf 196)   # RED
    USER_COLOR=$(tput setaf 33)         # BLUE
    PREPOSITION_COLOR=$(tput setaf 244) # GREY
    DEVICE_COLOR=$(tput setaf 39)       # CYAN
    DIR_COLOR=$(tput setaf 250)         # LIGHTER GREY
    GIT_STATUS_COLOR=$(tput setaf 202)  # ORANGE
    PROMPT_COLOR=$(tput setaf 250)      # LIGHTER GREY
    FILL_COLOR=$(tput setaf 244)        # LIGHTER GREY
  else
  # Otherwise, use colors from our set of 8
    ROOT_USER_COLOR=$(tput setaf 1)    # RED
    USER_COLOR=$(tput setaf 4)         # BLUE
    PREPOSITION_COLOR=$(tput setaf 7)  # WHITE
    DEVICE_COLOR=$(tput setaf 4)       # BLUE
    DIR_COLOR=$(tput setaf 7)          # WHITE
    GIT_STATUS_COLOR=$(tput setaf 1)   # RED
    PROMPT_COLOR=$(tput setaf 7)       # WHITE
    FILL_COLOR=$(tput setaf 7)         # WHITE
  fi

  # Save common color actions
  BOLD=$(tput bold)
  RESET=$(tput sgr0)
else
# Otherwise, use ANSI escape sequences for coloring
  # If you would like to customize your colors, use
  # DEV: 30-39 lines up 0-9 from `tput`
  # for i in $(seq 0 109); do
  #   echo -n -e "\033[1;${i}mText$(tput sgr0) "
  #   echo "\033[1;${i}m"
  # done
  ROOT_USER_COLOR="\033[1;31m"   # RED
  USER_COLOR="\033[1;34m"        # BLUE
  PREPOSITION_COLOR="\033[1;90m" # GREY
  DEVICE_COLOR="\033[1;36m"      # CYAN
  DIR_COLOR="\033[1;90m"         # GREEN
  GIT_STATUS_COLOR="\033[1;31m"  # RED
  PROMPT_COLOR="\033[1;90m"      # GREY
  FILL_COLOR="\033[1;90m"        # GREY
  BOLD=""
  RESET="\033[m"
fi

function get_git_branch() {
  # On branches, this will return the branch name
  # On non-branches, (no branch)
  REF="$(git symbolic-ref HEAD 2> /dev/null | sed -e 's/refs\/heads\///')"
  if [[ $REF != "" ]]; then
    echo $REF
  else
    echo "(no branch)"
  fi
}

function is_on_git() {
  git rev-parse 2> /dev/null
}

get_git_info () {
  # Grab the branch
  BRANCH="$(get_git_branch)"

  # If there are any branches
  if [[ $BRANCH != "" ]]; then
    # Echo the branch
    OUTPUT=$BRANCH

    # Echo our output
    echo $OUTPUT
  fi
}

# Symbol displayed at the line of every prompt
function get_prompt_symbol() {
  # If we are root, display `#`. Otherwise, `$`
  if [[ $UID == 0 ]]; then
    echo "#"
  else
    echo "\$"
  fi
}

# Dynamic USER_COLOR
function get_user_color() {
  # If we are root, display ROOT_USER_COLOR. Otherwise, USER_COLOR
  if [[ $UID == 0 ]]; then
    echo $ROOT_USER_COLOR
  else
    echo $USER_COLOR
  fi
}

function prompt_command() {
    # create a $fill of all screen width minus the time string and a space:
    let FILLSIZE=${COLUMNS}-9
    FILL=""
    while [ "$FILLSIZE" -gt "0" ]
    do
        FILL="-${FILL}" # fill with underscores to work on
        let FILLSIZE=${FILLSIZE}-1
    done
}

# Define the sexier-bash-prompt
PS1="\[$FILL_COLOR\]$FILL \t\n\
\[$(get_user_color)\]\u\
\[$PREPOSITION_COLOR\]@\
\[$DEVICE_COLOR\]\h \
\[$PREPOSITION_COLOR\]\
\[$DIR_COLOR\]\w\
\[$PREPOSITION_COLOR\]\
\$( is_on_git && \
  echo -n \"${BOLD} \" && \
  echo -n \"\[$GIT_STATUS_COLOR\]\$(get_git_info)\" && \
  echo -n \"\[$PROMPT_COLOR\]\")\n\
$(get_prompt_symbol) \[$RESET\]"

PROMPT_COMMAND=prompt_command