.bash_prompt

#!/bin/bash

# Function to display Git repository status in prompt
prompt_git() {
  local s='' branchName=''

  # Check if the current directory is in a Git repository
  if [ "$(git rev-parse --is-inside-work-tree &>/dev/null; echo "${?}")" == '0' ] && [ "$(git rev-parse --is-inside-git-dir 2> /dev/null)" == 'false' ]; then
    # Update Git index if necessary
    [[ -O "$(git rev-parse --show-toplevel)/.git/index" ]] && git update-index --really-refresh -q &> /dev/null

    # Git status checks
    s+=$(check_uncommitted_changes)
    s+=$(check_unstaged_changes)
    s+=$(check_untracked_files)
    s+=$(check_stashed_files)

    # Get the current branch name or commit hash
    branchName=$(get_git_branch)

    [ -n "${s}" ] && s=" [${s}]"
    echo -e "${1}${branchName}${blue}${s}"
  else
    return
  fi
}

# Additional git functions
check_uncommitted_changes() { ! git diff --quiet --ignore-submodules --cached && echo '+'; }
check_unstaged_changes() { ! git diff-files --quiet --ignore-submodules -- && echo '!'; }
check_untracked_files() { [ -n "$(git ls-files --others --exclude-standard)" ] && echo '?'; }
check_stashed_files() { git rev-parse --verify refs/stash &>/dev/null && echo '$'; }
get_git_branch() { git symbolic-ref --quiet --short HEAD 2> /dev/null || git rev-parse --short HEAD 2> /dev/null || echo '(unknown)'; }

# Detect if running in a cloud environment
detect_cloud_environment() {
  if [[ -f /proc/cpuinfo ]] && grep -q "^flags.* hypervisor" /proc/cpuinfo && [[ ! -d "/mnt/c/Windows/" ]]; then
    cloud="☁️ "
  else
    cloud=""
  fi
}

# Terminal color setup
setup_terminal_colors() {
  if tput setaf 1 &> /dev/null; then
    tput sgr0; # reset colors
    bold=$(tput bold);
    reset=$(tput sgr0);
    black=$(tput setaf 0);
    blue=$(tput setaf 33);
    cyan=$(tput setaf 37);
    green=$(tput setaf 64);
    orange=$(tput setaf 166);
    purple=$(tput setaf 125);
    red=$(tput setaf 124);
    violet=$(tput setaf 61);
    white=$(tput setaf 15);
    yellow=$(tput setaf 136);
  else
    bold='';
    reset="\\e[0m";
    black="\\e[1;30m";
    blue="\\e[1;34m";
    cyan="\\e[1;36m";
    green="\\e[1;32m";
    orange="\\e[1;33m";
    purple="\\e[1;35m";
    red="\\e[1;31m";
    violet="\\e[1;35m";
    white="\\e[1;37m";
    yellow="\\e[1;33m";
  fi
}

# User and Host styling for prompt
set_prompt_styles() {
  [[ "${USER}" == "root" ]] && userStyle="${red}" || userStyle="${blue}"
  [[ "${SSH_TTY}" ]] && hostStyle="${bold}${cyan}" || hostStyle="${cyan}"
}

# PS1 and PS2: Main and secondary prompt string setup
setup_prompts() {
  PS1="\\[\\033]0;\\w\\007\\]"  # Set terminal title to current directory
  PS1+="\\[${bold}\\]\\n"       # Newline
  PS1+="\\[${userStyle}\\]\\u"  # Username
  PS1+="\\[${white}\\] at "
  PS1+="\\[${hostStyle}\\]${cloud}\\h"  # Hostname
  PS1+="\\[${white}\\] in "
  PS1+="\\[${green}\\]\\w"              # Working directory
  PS1+="\$(prompt_git \"${white} on ${violet}\")"  # Git details
  PS1+="\\n"
  PS1+="\\[${white}\\]\$ \\[${reset}\\]"  # `$` prompt and reset color
  export PS1

  PS2="\\[${yellow}\\]→ \\[${reset}\\]"
  export PS2
}

# Check terminal color support
check_terminal_color_support() {
  case "$TERM" in
    xterm-color|*-256color) color_prompt=yes ;;
    *) color_prompt=no ;;
  esac
}

# Configure terminal title for specific terminals
configure_terminal_title() {
  case "$TERM" in
    xterm*|rxvt*)
      PS1="\[\e]0;${debian_chroot:+($debian_chroot)}\u@\h: \w\a\]$PS1"
      ;;
    *)
      ;;
  esac
}

# Invoke the functions
detect_cloud_environment
setup_terminal_colors
set_prompt_styles
setup_prompts
check_terminal_color_support
configure_terminal_title