dotfiles/sxhkd/.local/bin/sxhkd-chain-labels

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#!/usr/bin/env sh
# output is to stdout unless explicitly set through -o
OUTPUTF=""
# set fifo input file, according (somewhat) to xdg
[ -n "$SXHKD_FIFO" ] && FIFO="$SXHKD_FIFO"
[ ! -e "$FIFO" ] && FIFO="${XDG_RUNTIME_DIR}"/sxhkd_fifo
[ ! -e "$FIFO" ] && FIFO="${XDG_CACHE_HOME:-$HOME/.cache}"/sxhkd_fifo
[ ! -e "$FIFO" ] && FIFO="$HOME/.sxhkd_fifo"
# set label config file, according (somewhat) to xdg
[ -n "$SXHKD_LABELCONFIG" ] && LABELCONFIG="$SXHKD_LABELCONFIG"
[ ! -f "$LABELCONFIG" ] && LABELCONFIG="${XDG_CONFIG_HOME:-$HOME/.config}"/sxhkd/chain-labels.conf
[ ! -f "$LABELCONFIG" ] && LABELCONFIG="$HOME/.chain-labels.conf"
main() {
while read -r event; do
detect_event "$event"
done <"$FIFO"
}
detect_event() {
ev="$(echo "$1" | sed -e 's/^H.*$/hotkey/;s/^C.*$/command/;s/^BBegin chain.*$/chainstart/;s/^EEnd chain.*$/chainend/;')"
case $ev in
hotkey) ev_hotkey "$(echo "$1" | sed -e 's/^H//')" ;;
# command) ev_command "$(echo "$1" | sed -e 's/^C//')" ;;
chainstart) ev_chainstart "$(echo "$1" | sed -e 's/^B//')" ;;
chainend) ev_chainend "$(echo "$1" | sed -e 's/^E//')" ;;
*) ;;
esac
}
send_msg() {
if [ -n "$OUTPUTF" ]; then
echo "$1" >"$OUTPUTF"
else
echo "$1"
fi
}
ev_hotkey() {
LAST_HOTKEY="$1"
}
# compare labels to last hotkey, return mode name
ev_chainstart() {
[ -z "$LAST_HOTKEY" ] && return 1
found=$(echo "$LABELS" | sed -e "/$LAST_HOTKEY/!d;s/^\(.\+\):.*$/\1/")
send_msg "$found"
}
ev_chainend() {
send_msg ""
}
# TODO add option to also display last command done in chain
# ev_command() {
# send_msg "command: $1"
# }
# read config from file, remove comments (lines starting with #) and empty lines
read_config() {
[ -f "$1" ] && LABELS="$(sed -e '/^#/d;/^[[:blank:]]*$/d' <"$1")" || LABELS=""
}
get_help() {
printf \
"Usage: sxhkd-chain-labels [-c config file][-o output file][-s input pipe]
By default will take the input from the input pipe (at XDG_RUNTIME_DIR/sxhkd_fifo) and
print the current sxhkd chain mode to stdout. That means, sxhkd needs to be started
with a fifo pipe running, ideally to the XDG_RUNTIME_DIR:
mkfifo \$XDG_RUNTIME_DIR/sxhkd_fifo && sxhkd -s \$XDG_RUNTIME_DIR/sxhkd_fifo
When given a key combination which maps to a specific mode, it will print out the name
of the mode instead. These maps can be passed with -c flag, specifying an options file.
By default it will look in \$XDG_CONFIG_HOME/sxhkd/sxhkd-chain-labels.conf
When passed the -o flag it will replace the contents of the file passed in with the
current sxhkd chain mode, emptying the file when no mode is active.
Default lookup places for files, in descending order:
:input fifo
\$SXHKD_FIFO (env variable)
\$XDG_RUNTIME_DIR/sxhkd_fifo
\$XDG_CACHE_HOME/sxhkd_fifo
~/.cache/sxhkd_fifo
~/.sxhkd_fifo
:label configuration
\$SXHKD_LABELCONFIG (env variable)
\$XDG_CONFIG_HOME/sxhkd/chain-labels.conf
~/.config/sxhkd/chain-labels.conf
~/.chain-labels.conf
The label configuration file uses the following format:
mode-name:chain activation combination
Lines beginning with a # will be ignored. Whitespace is
important, sxhkd will, by default, put a single space
between any component of the key combination.
An example file:
media:super + alt + m
system:super + backspace
\n"
}
get_version() {
printf \
"%s: 0.1
fifo input pipe:
%s
label configuration file:
%s
output:
%s \n" \
"$0" \
"$FIFO" \
"$LABELCONFIG" \
"${OUTPUTF:-stdout}"
}
while getopts "vho:s:c:" opt; do
case "$opt" in
\?)
printf "Usage: sxhkd-chain-labels [-c config file][-o output file][-s input pipe]\n"
exit 0
;;
h)
get_help
exit 0
;;
v)
get_version
exit 0
;;
o) OUTPUTF="$OPTARG" ;;
s) FIFO="$OPTARG" ;;
c) LABELCONFIG="$OPTARG" ;;
esac
done
shift $((OPTIND - 1))
[ "${1:-}" = "--" ] && shift
# look for default label config
[ -z "$LABELS" ] && read_config "$LABELCONFIG"
main "$@"