Custom PS1 prompt

bashrc

if ((psi==1));then
  PS1='$(
  exitstatus=$?
  if ((exitstatus==0));then
	exitstatus=''
  fi
  predots=""
  postdots=""
  extrachars=6
  if [[ "$PWD" =~ ^$HOME ]];then
	pwd=${PWD/$HOME/\~}
  else
	pwd=$PWD
  fi
  if [[ -z $COLUMNS ]];then
	if type -P tput >/dev/null;then
	  COLUMNS=$(tput cols)
	else
	  COLUMNS=80
	fi
  fi
  (( PATHLEN=COLUMNS-${#USER}-extrachars-${#exitstatus} ))
  if (( PATHLEN>=1 )) && (( ${#pwd}>PATHLEN ));then
	DIR=${pwd/*\/}
	if (( ${#DIR}>PATHLEN ));then
	  postdots=...
	  pwd="${DIR:0:$(( PATHLEN-3 ))}"
	else
	  predots=...
	  pwd="${pwd:$(( ${#pwd}-PATHLEN+3 ))}"
	fi
  fi
  if ((EUID>0));then
	promptchar=$
  else
	promptchar=#
  fi
  printf '\''\[\e[1;31m\]%s\[\e[0m\]'\'' $exitstatus
  printf '\''\[\e[0m\][ \[\e[1m\]%s\[\e[0m\]: '\'' "$USER"
  printf '\''\[\e[0;31m\]%s\[\e[0m\]'\'' "$predots"
  printf %s "$pwd"
  printf '\''\[\e[0;31m\]%s\[\e[0m\]'\'' "$postdots"
  printf '\'' ]\n\[\e[1m\]%s\[\e[0m\] '\'' $promptchar
  )'
elif ((psi==2));then
  # style:
  # meow: .../meoow/nodefinder/example1 $
  # meow: aaaaaaaaaaaaaaaaaaaaaaaaaa... $
  PS1='$(
  exitstatus=$?
  if ((exitstatus==0));then
	exitstatus=''
  fi
  predots=""
  postdots=""
  extrachars=7
  if [[ "$PWD" =~ ^$HOME ]];then
	pwd=${PWD/$HOME/\~}
  else
	pwd=$PWD
  fi
  if [[ -z $COLUMNS ]];then
	if type -P tput >/dev/null;then
	  COLUMNS=$(tput cols)
	else
	  COLUMNS=80
	fi
  fi
  (( PATHLEN=COLUMNS/2-${#USER}-extrachars-${#exitstatus} ))
  if (( PATHLEN>=1 )) && (( ${#pwd}>PATHLEN ));then
	DIR=${pwd/*\/}
	if (( ${#DIR}>PATHLEN ));then
	  postdots=...
	  pwd="${DIR:0:$(( PATHLEN-3 ))}"
	else
	  predots=...
	  pwd="${pwd:$(( ${#pwd}-PATHLEN+3 ))}"
	fi
  fi
  if ((EUID>0));then
	promptchar=$
  else
	promptchar=#
  fi
  printf '\''\[\e[1;31m\]%s\[\e[0m\]'\'' $exitstatus
  printf '\''\[\e[0m\] \[\e[1m\]%s\[\e[0m\]: '\'' "$USER"
  printf '\''\[\e[0;31m\]%s\[\e[0m\]'\'' "$predots"
  printf %s "$pwd"
  printf '\''\[\e[0;31m\]%s\[\e[0m\]'\'' "$postdots"
  printf '\'' \[\e[1m\]%s\[\e[0m\] '\'' $promptchar
  )'
elif ((psi==3));then
  # style:
  # [ meow@mmm-air: ...huber__/go/src/github.com/meoow/nodefinder/example1 ]
  # $
  # [ meow@mmm-air: aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa... ]
  # $
  PS1='$(
  exitstatus=$?
  if ((exitstatus==0));then
	exitstatus=''
  fi
  predots=""
  postdots=""
  extrachars=7
  if [[ "$PWD" =~ ^$HOME ]];then
	pwd=${PWD/$HOME/\~}
  else
	pwd=$PWD
  fi
  if [[ -z $COLUMNS ]];then
	if type -P tput >/dev/null;then
	  COLUMNS=$(tput cols)
	else
	  COLUMNS=80
	fi
  fi
  (( PATHLEN=COLUMNS-${#USER}-${#HOSTNAME}-extrachars-${#exitstatus} ))
  if (( PATHLEN>=1 )) && (( ${#pwd}>PATHLEN ));then
	DIR=${pwd/*\/}
	if (( ${#DIR}>PATHLEN ));then
	  postdots=...
	  pwd="${DIR:0:$(( PATHLEN-3 ))}"
	else
	  predots=...
	  pwd="${pwd:$(( ${#pwd}-PATHLEN+3 ))}"
	fi
  fi
  if ((EUID>0));then
	promptchar=$
  else
	promptchar=#
  fi
  printf '\''\[\e[1;31m\]%s\[\e[0m\]'\'' $exitstatus
  printf '\''\[\e[0m\][ \[\e[1m\]%s\[\e[0m\]@%s: '\'' "$USER" "$HOSTNAME"
  printf '\''\[\e[0;31m\]%s\[\e[0m\]'\'' "$predots"
  printf %s "$pwd"
  printf '\''\[\e[0;31m\]%s\[\e[0m\]'\'' "$postdots"
  printf '\'' ]\n\[\e[1m\]%s\[\e[0m\] '\'' $promptchar
  )'
elif ((psi==4));then
  PS1='$(
  exitstatus=$?
  if ((exitstatus==0));then
	exitstatus=''
  fi
  extrachars=6
  if [[ "$PWD" =~ ^$HOME ]];then
	pwd=${PWD/$HOME/\~}
  else
	pwd=$PWD
  fi
  if [[ -z $COLUMNS ]];then
	if type -P tput >/dev/null;then
	  COLUMNS=$(tput cols)
	else
	  COLUMNS=80
	fi
  fi
  (( PATHLEN=COLUMNS-${#USER}-extrachars-${#exitstatus} ))
  pwdlen=${#pwd}
  if (( pwdlen>PATHLEN ));then
	newdirlist=()
	IFS=/ pwdlist=($pwd)
	for (( i=0; i<${#pwdlist[@]}; i++ ));do
	  p=${pwdlist[i]}
	  plen=${#p}
	  if (( pwdlen<=PATHLEN )) || (( plen<2 ));then
		newdirlist+=(0 "$p")
	  else
		if (( (pwdlen-PATHLEN)>plen ));then
		  (( pwdlen-=(${#p}-1 )))
		  newdirlist+=(31 ${p:0:1})
		else
		  (( endlen=plen-(pwdlen-PATHLEN) ))
		  p=${p:0:$endlen}
		  newdirlist+=(31 "$p")
		  (( pwdlen=PATHLEN ))
		fi
	  fi
	done
  else
	newdirlist=(0 "$pwd")
  fi
  if ((EUID>0));then
	promptchar=$
  else
	promptchar=#
  fi
  printf '\''\[\e[1;31m\]%s\[\e[0m\]'\'' $exitstatus
  printf '\''\[\e[0m\][ \[\e[1m\]%s\[\e[0m\]: '\'' "$USER"
  printf '\''\[\e[%dm\]%s\[\e[0m\]/'\'' "${newdirlist[@]}"
  printf '\''\b ]\n\[\e[1m\]%s\[\e[0m\] '\'' $promptchar
  )'
elif ((psi==5));then
  PS1='$(
  exitstatus=$?
  if ((exitstatus==0));then
	exitstatus=''
  fi
  extrachars=7
  if [[ "$PWD" =~ ^$HOME ]];then
	pwd=${PWD/$HOME/\~}
  else
	pwd=$PWD
  fi
  if [[ -z $COLUMNS ]];then
	if type -P tput >/dev/null;then
	  COLUMNS=$(tput cols)
	else
	  COLUMNS=80
	fi
  fi
  (( PATHLEN=COLUMNS/2-${#USER}-extrachars-${#exitstatus} ))
  pwdlen=${#pwd}
  newdirlist=()
  if (( pwdlen>PATHLEN ));then
	IFS=/ pwdlist=($pwd)
	for (( i=0; i<${#pwdlist[@]}; i++ ));do
	  p=${pwdlist[i]}
	  plen=${#p}
	  if (( pwdlen<=PATHLEN )) || (( plen<2 ));then
		newdirlist+=(0 "$p")
	  else
		if ((( pwdlen-PATHLEN)>plen ));then
		  (( pwdlen-=(${#p}-1) ))
		  newdirlist+=(31 ${p:0:1})
		else
		  (( endlen=plen-(pwdlen-PATHLEN) ))
		  p=${p:0:$endlen}
		  newdirlist+=(31 "$p")
		  (( pwdlen=PATHLEN ))
		fi
	  fi
	done
  else
	newdirlist=(0 "$pwd")
  fi
  if ((EUID>0));then
	promptchar=$
  else
	promptchar=#
  fi
  printf '\''\[\e[1;31m\]%s\[\e[0m\]'\'' $exitstatus
  printf '\''\[\e[0m\] \[\e[1m\]%s\[\e[0m\]: '\'' "$USER"
  printf '\''\[\e[%dm\]%s\[\e[0m\]/'\'' "${newdirlist[@]}"
  printf '\''\b \[\e[1m\]%s\[\e[0m\] '\'' $promptchar
  )'
fi