#!/bin/bash - not strictly necessary, but helps nano with syntax highlighting.
# Bash specific configuration.

__prompt_user_colour() {
  # Determine the colour of the username in the prompt.

  if [[ "$LOGNAME" == "root" ]]; then
    printf "%s" "1;31m"		# Bright Red.
  elif [[ "$LOGNAME" == "tadgy" ]]; then
    printf "%s" "1;32m"		# Bright Green.
  else
    printf "%s" "1;36m"		# Bright Cyan.
  fi

  return 0
}

# Determine the platform being logged into.
PLATFORM="${PLATFORM:-$(uname -s)}"

# Make bash a little more pleasent - these are valid for all versions.
shopt -s cdspell checkhash checkwinsize cmdhist histappend no_empty_cmd_completion

# Exit the shell on a Ctl+D.
IGNOREEOF=0

# History control.
HISTCONTROL="ignoredups"
HISTFILE="$HOME/.bash_history-${HOSTNAME%%.*}"
HISTFILESIZE=1000000
HISTIGNORE="bg:bg *:fg:fg *:jobs:exit:clear:history"
HISTSIZE=1000000
HISTTIMEFORMAT="%d/%m/%y %H:%M:%S  "
history -a
history -r

# Git prompt options.
GIT_PROMPT_SHOW_TYPE=1
GIT_PROMPT_SHOW_UPSTREAM=1
GIT_PROMPT_SHOW_UPSTREAM_EXTENDED=1
GIT_PROMPT_SHOW_IGNORED=1
GIT_PROMPT_SHOW_UNSTAGED=1
GIT_PROMPT_SHOW_UNCOMMITTED=1
GIT_PROMPT_SHOW_UNTRACKED=1
GIT_PROMPT_SHOW_STASH=1

# Version specific set up.
if (( BASH_VERSINFO[0] >= 4 )); then
  # Add to the shopts.
  shopt -s checkjobs dirspell

  # Trim the path in the prompt.
  PROMPT_DIRTRIM=2
  # Coloured username + host + directory in the prompt.
  PS1='[\[\033[$(__prompt_user_colour)\]\u\[\033[0m\]@\[\033[1;33m\]\h\[\033[0m\]] \[\033[1;34m\]\w\[\033[0m\]'
else
  # Coloured username + host + directory in the prompt.
  PS1='[\[\033[$(__prompt_user_colour)\]\u\[\033[0m\]@\[\033[1;33m\]\h\[\033[0m\]] \[\033[1;34m\]$(printf "%s" "${PWD/#$HOME/~}" | awk -F/ '\''{if (NF>3) {printf ".../" $(NF-1) "/" $NF} else {printf $0}}'\'')\[\033[0m\]'
fi

# Set the debugger prompt.
# shellcheck disable=SC2155
export PS4='+(\[\033[1;33m\]$?\[\033[0m\]) \[\033[1;34m\]${BASH_SOURCE##*/}\[\033[0m\]${FUNCNAME[0]:+(\[\033[1;32m\]${FUNCNAME[0]}\[\033[0m\])}:\[\033[1;31m\]$LINENO\[\033[0m\]: '

# Common aliases.
hash bc >/dev/null 2>&1 && alias bc='bc -lq'
hash grep >/dev/null 2>&1 && { alias egrep='grep -E --color=auto'; alias fgrep='grep -F --color=auto'; alias grep='grep --color=auto'; }

# Platform specific set up.
if [[ "$PLATFORM" = "Linux" ]]; then
  # Linux specific functions.
  hash ps grep >/dev/null 2>&1 && psgrep() {
    if [[ -n "$1" ]]; then
      # shellcheck disable=SC2009
      ps -auwwx | command grep -E --color=always -- "(.*RSS.*|$1)" | command grep -F -v '(.*RSS.*|'
    else
      printf "%s: %s\\n" "Usage" "${FUNCNAME[0]} <something>" >&2
      return 1
    fi
  }

  # Linux specific aliases.
  hash diff >/dev/null 2>&1 && alias diff='diff --color=auto -u'
  hash ftpwho >/dev/null 2>&1 && alias ftpwho='ftpwho -v'
  hash gpg2 >/dev/null 2>&1 && alias gpg='command gpg2' && alias gpg2='gpg2 --pinentry-mode=loopback'
  hash iftop >/dev/null 2>&1 && alias iftop='TERM=vt100 iftop'
  hash iotop >/dev/null 2>&1 && alias iotop='TERM=linux iotop'
  hash ip >/dev/null 2>&1 && alias ip='ip -color=auto'
  hash last less >/dev/null 2>&1 && alias laston='last -a | less'
  hash ls >/dev/null 2>&1 && alias ls='ls -bFv --color=auto'
  hash minicom >/dev/null 2>&1 && alias minicom='minicom -m -c on'
  hash mkpasswd >/dev/null 2>&1 && { alias mkpasswd='mkpasswd -m sha512crypt'; alias pwgen='mkpasswd -m sha512crypt'; }
  hash nc >/dev/null 2>&1 && alias pastebin='nc termbin.com 9999'
  hash pinfo >/dev/null 2>&1 && alias info='pinfo'
  hash ping >/dev/null 2>&1 && alias ping='ping -b'
  hash xclip >/dev/null 2>&1 && alias file2clip='DISPLAY=:0.0 xclip -selection clipboard'
elif [[ "$PLATFORM" = "Darwin" ]]; then
  # Darwin specific aliases (some dependant on macports).
  hash df >/dev/null 2>&1 && [[ ! -e "/opt/local/libexec/gnubin/df" ]] && alias df='df -kP'
  hash diff >/dev/null 2>&1 && alias diff='diff -u'
  [[ -e "/opt/local/libexec/gnubin//diff" ]] && alias diff='diff --color=auto -u'
  hash last less >/dev/null 2>&1 && alias laston='last | less'

  hash ls >/dev/null 2>&1 && alias ls='ls -bFGO'
  [[ -e "/opt/local/libexec/gnubin/ls" ]] && alias ls='ls -bFv --color=auto'
  [[ -e "/opt/local/libexec/gnubin/nc" ]] && alias pastebin='nc termbin.com 9999'
  [[ -e "/opt/local/bin/pinfo" ]] && alias info='pinfo'
  hash top >/dev/null 2>&1 && alias top='top -o cpu -S'
else
  printf "%s: %s\\n" "${BASH_SOURCE##*/}" "unsupported platform: $PLATFORM" >&2
fi

# Read in the shell configuration from .bashrc.d/*.
for FILE in "$HOME"/.bashrc.d/*; do
  [[ -x "$FILE" ]] && source "$FILE"
done
unset FILE

# Finalise the prompt.
PS1+=' ->'