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|
# Environment variables:
#
# PS1_SHOWHOSTNAME
# 'auto' (default): Only show hostname over SSH
# 'yes': Always show hostname
# anything else: Never show hostname
if [ "${TERM}" = dumb ]
then
return
fi
__show-hostname ()
{
case ${PS1_SHOWHOSTNAME} in
(''|auto)
[ "${SSH_CONNECTION}" ];;
(yes)
true;;
(*)
false;;
esac
}
__have-gitprompt ()
{
[ -f /usr/lib/git-core/git-sh-prompt ]
}
__set-title ()
{
local title
local git_root=$(git root 2> /dev/null)
if [ ${git_root} ]
then
title=$(basename ${git_root})
else
local path=${PWD/~/\~}
if __show-hostname
then
title="${USER}@${HOSTNAME}:${path}"
else
title="${USER}:${path}"
fi
fi
# Cf. console_codes(4):
#
# ESC ] 2 ; txt ST Set window title to txt.
#
# ST is a "string terminator", either "ESC \" or "BEL".
echo -ne "\E]2;${title}\a"
}
# In order to know how much space PS1 takes, Bash needs us to delimit
# non-printing characters with \[ and \].
__start-nonprinting ()
{
if [ ${BUILDING_PS1} ]
then
echo -en '\['
fi
}
__end-nonprinting ()
{
if [ ${BUILDING_PS1} ]
then
echo -en '\]'
fi
}
__fontify ()
{
local -A codes=(
[bold]=1
[dim]=2
[red]=31
[green]=32
[blue]=34
)
local text=$1
shift
__start-nonprinting
echo -en '\E['
for ((i=1; i<=$#; i++))
do
echo -en ${codes[${!i}]}
if ((i<$#))
then
echo -en ';'
else
echo -en 'm'
fi
done
__end-nonprinting
echo -en "${text}"
__start-nonprinting
echo -en '\E[0m'
__end-nonprinting
}
__set-prompt ()
{
BUILDING_PS1=t
PS1=''
PS1+="$(__write-context)\n"
PS1+=$(__fontify '\$' dim)
PS1+=' '
unset BUILDING_PS1
}
__current-column ()
{
# Cf. console_codes(4) ยง ECMA-48 Status Report Commands
local position
read -sdR -p$'\E[6n' position
local pattern='\[[0-9]+;([0-9]+)'
if [[ ${position} =~ ${pattern} ]]
then
echo ${BASH_REMATCH[1]}
else
echo 0
fi
}
__signal-no-newline ()
{
local signal="/\n"
__fontify ${signal} bold red
}
__draw-rule ()
{
local line=''
for ((i=$(__current-column); i<COLUMNS; i++))
do
line+=โ
done
# If we do not add a newline, whatever comes after will be shoved
# offscreen when autowrap is off.
line+='\n'
__fontify ${line} $@
}
__write-context ()
{
local context=''
context+=$(__fontify '\u' green)
if __show-hostname
then
context+=$(__fontify @ dim)
context+=$(__fontify '\h' bold green)
fi
context+=$(__fontify : dim)
context+=$(__fontify '\w' bold blue)
if [ ${PS1_SHOWGITSTATUS} ]
then
context+=$(__fontify "$(__git_ps1 '(%s)')" red)
fi
echo ${context}
}
__refresh-terminal ()
{
local last_status=$?
local last_column=$(__current-column)
__set-title
if [ ${last_column} -ne 1 ]
then
__signal-no-newline
fi
if [ ${last_status} -ne 0 ]
then
__fontify "${last_status} " bold red
__draw-rule dim red
else
__draw-rule dim
fi
__set-prompt
}
if __have-gitprompt
then
. /usr/lib/git-core/git-sh-prompt
GIT_PS1_SHOWDIRTYSTATE=t
GIT_PS1_SHOWUPSTREAM=auto
PS1_SHOWGITSTATUS=t
fi
export PROMPT_COMMAND=__refresh-terminal
|
