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

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#!/usr/bin/env sh
# output is to stdout unless explicitly set through -o or env var
OUTPUTF="$SXHKD_OUTPUTF"
# set fifo input file, according (somewhat) to xdg
if [ -n "$SXHKD_FIFO" ]; then
FIFO="$SXHKD_FIFO"
elif [ -p "${XDG_RUNTIME_DIR}"/sxhkd_fifo ]; then
FIFO="${XDG_RUNTIME_DIR}"/sxhkd_fifo
elif [ -p "${XDG_CACHE_HOME:-$HOME/.cache}"/sxhkd_fifo ]; then
FIFO="${XDG_CACHE_HOME:-$HOME/.cache}"/sxhkd_fifo
elif [ -p "$HOME/.sxhkd_fifo" ]; then
FIFO="$HOME/.sxhkd_fifo"
fi
# set label config file, according (somewhat) to xdg
if [ -n "$SXHKD_LABELCONFIG" ]; then
LABELCONFIG="$SXHKD_LABELCONFIG"
elif [ -f "${XDG_CONFIG_HOME:-$HOME/.config}"/sxhkd/chain-labels.conf ]; then
LABELCONFIG="${XDG_CONFIG_HOME:-$HOME/.config}"/sxhkd/chain-labels.conf
elif [ -f "$HOME/.chain-labels.conf" ]; then
LABELCONFIG="$HOME/.chain-labels.conf"
fi
SXHKDRC_FILE="$XDG_CONFIG_HOME"/sxhkd/sxhkdrc
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 "$1" ] && return 1
parse_labels "$(cat "$1")"
}
# parse sxhkdrc for mode compatible comments
read_sxhkdrc() {
[ ! -f "$1" ] && return 1
_sxhkdrc_content="$(sed -e '/^# mode:/!d;s/^# mode://' <"$1")"
parse_labels "$_sxhkdrc_content"
}
# append
parse_labels() {
LABELS="${LABELS}$(echo "$1" | sed -e '/^#/d;/^[[:blank:]]*$/d')"
}
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
\$XDG_CONFIG_HOME/sxhkd/sxhkdrc (parsing)
The label configuration file uses the following format:
mode name:key chain
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 chain-labels.conf:
media:super + alt + m
system:super + backspace
Instead of using an explicit configuration file, you can put the chain mode
information into the regular sxhkdrc as comments. They need to follow this exact format:
# mode:mode-name:key-chain
They can occur anywhere in the file. The space between # and mode is necessary, and #
needs to be the first character on the line.
The above example file as written into the sxhkdrc:
# mode:media:super + alt + m
# mode:system:super + backspace
If an explicit configuration file exists, it will supersede any mode information in the
sxhkdrc file.
\n"
}
get_version() {
printf \
"%s: 0.3
fifo input pipe:
%s %s
label configuration file:
%s %s
output:
%s \n" \
"$0" \
"$FIFO" \
"$([ -p "$FIFO" ] && echo "(found)" || echo "(NOT FOUND)")" \
"${LABELCONFIG:-"$SXHKDRC_FILE"}" \
"$([ -f "${LABELCONFIG:-"$SXHKDRC_FILE"}" ] && echo "(found)" || echo "(NOT FOUND)")" \
"${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, prefer config file to parsing sxhkdrc
[ -z "$LABELS" ] && read_config "$LABELCONFIG"
[ -z "$LABELS" ] && read_sxhkdrc "$SXHKDRC_FILE"
main "$@"