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|
# Environment variables:
#
# PS1_SHOWHOSTNAME
# 'auto' (default): Only show hostname over SSH
# 'yes': Always show hostname
# anything else: Never show hostname
__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=${USER}
if __show-hostname
then
title+="@${HOSTNAME}"
fi
title+=:
local path=${PWD/~/\~}
local git_root=$(git rev-parse --show-toplevel 2> /dev/null)
if [ -z "${git_root}" -o "${git_root}" = ~ ]
then
title+=${path}
else
local project=$(basename "${git_root}")
path=$(realpath --relative-to "${git_root}" "${PWD}")
if [ "${path}" = . ]
then
title+=${project}
else
title+=${project}/${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=$1
shift
__start-nonprinting
echo -en '\E['
local i
for ((i=1; i<=$#; 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="$(__write-context)\n$(__fontify '\$' dim) "
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 ()
{
echo $(__fontify ๐ bold red)
}
__draw-rule ()
{
local i line
for ((i=$(__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 ()
{
__fontify '\u' green
if __show-hostname
then
__fontify @ dim
__fontify '\h' bold green
fi
__fontify : dim
__fontify '\w' bold blue
if [ ${PS1_SHOWGITSTATUS} ]
then
__fontify "$(__git_ps1 '(%s)')" red
fi
}
__refresh-terminal ()
{
local last_status=$?
__set-title
if [ $(__current-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
}
PS2='โฆ '
if [ "${TERM}" = dumb ]
then
PS1='$? \u:\w\$ '
return
fi
PS2=$(__fontify "${PS2}" dim)
if __have-gitprompt
then
. /usr/lib/git-core/git-sh-prompt
GIT_PS1_SHOWDIRTYSTATE=t
GIT_PS1_SHOWUPSTREAM=auto
PS1_SHOWGITSTATUS=t
fi
PROMPT_COMMAND=__refresh-terminal
|
