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|
__tmp="`mktemp -d`"
__trylock() {
local dir
dir="$__tmp/$1.lock"
mkdir "$dir" &>/dev/null
return $?
}
__queue_init() {
local r
local w
mkdir "$__tmp/$1.read.lock" ; r=$?
mkdir "$__tmp/$1.write.lock" ; w=$?
if [ "$r" '=' '0' -a "$w" '=' '0' ] ; then
return 0
else
return 1
fi
}
__queue_try_read() {
__trylock "$1.read"
return $?
}
__queue_try_write() {
__trylock "$1.write"
return $?
}
__queue_make_readable() {
rm -r "$__tmp/$1.read.lock" &>/dev/null
return $?
}
__queue_make_writable() {
rm -r "$__tmp/$1.write.lock" &>/dev/null
return $?
}
__read() {
cat "$__tmp/$1" 2> /dev/null
return $?
}
__write() {
cat > "$__tmp/$1" 2> /dev/null
return $?
}
__update_prompt() {
local prompt
prompt=''
linux_distro="$DISTRO"
if [ -n "$linux_distro" ] ; then
linux_distro='\[\e[1;34m\][\[\e[0;34m\]'"$linux_distro"'\[\e[1;34m\]]'
if [ -n "$prompt" ] ; then
prompt="$prompt "
fi
prompt="$prompt$linux_distro"
fi
git_head="`git -C /spack rev-parse --abbrev-ref HEAD 2>/dev/null`"
if [ "$?" '=' '0' ] ; then
if [ "$git_head" '=' 'HEAD' ] ; then
git_head="`git -C /spack rev-parse HEAD 2>/dev/null | cut -c1-8`..."
fi
else
git_head=''
fi
if [ -n "$git_head" ] ; then
git_head='\[\e[1;32m\](\[\e[0;32m\]'"$git_head"'\[\e[1;32m\])'
if [ -n "$prompt" ] ; then
prompt="$prompt "
fi
prompt="$prompt$git_head"
fi
if [ -n "$prompt" ] ; then
prompt="$prompt "
fi
prompt="$prompt"'\[\e[0;m\]\W: '
echo "$prompt" | __write prompt
}
set -m
(
__queue_init query
__queue_init prompt
__update_prompt
__queue_make_readable prompt
__queue_make_writable query
while sleep 0.010 ; do
last_q_time=''
while sleep 0.010 ; do
q_time="`date +%s%N`"
if __queue_try_read query ; then
last_q_time="$q_time"
__queue_make_writable query
fi
if [ -n "$last_q_time" -a \
"$(( (q_time - last_q_time)/10000000 > 100 ))" '=' '1' ] ; then
break
fi
done
__update_prompt
__queue_make_readable prompt
done
) &>/dev/null &
set +m
__update_prompt_main_first_call=1
__update_prompt_main() {
if [ "$__update_prompt_main_first_call" '=' '1' ] ; then
while sleep 0.001 ; do
if __queue_try_read prompt ; then
PS1="`__read prompt`"
break
fi
done
__update_prompt_main_first_call=0
else
if __queue_try_read prompt ; then
PS1="`__read prompt`"
fi
fi
if __queue_try_write query ; then
__queue_make_readable query
fi
}
PROMPT_COMMAND=__update_prompt_main
|
