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#!/bin/sh
awk=awk
me() { basename "$0"; }
printhelp() {
cat << HELPDOC
Usage:
$(me): [-gh] [COMMAND] [COMMAND ARGS]...
Args:
-g, --gen-cache : Force generate cache
-h, --help : show this help message
Config Syntax:
+host [HOSTNAME]
Add a new host. Hosts can be referenced using their number starting with 1.
[COMMAND]
launch [COMMAND] will start the process specified for the specific hostname. Aliases are separated by |.
[TAB][SHELL]
Run this shell command when the above [COMMAND] is specified. In order of hostnames. Can be a number to reference to a hostname, a '-' to disregard this command for the specific host, or a '^' to reference the previous command.
HELPDOC
}
# Make sure user is using GNU Awk (gawk)
checkawk() {
if ! ($awk -V >/dev/null 2>/dev/null && $awk -V | grep "GNU Awk" >/dev/null); then
if command -v gawk > /dev/null; then
awk=gawk
else
echo "$(me) requires GNU Awk (gawk) to function properly. Please install GNU Awk and try again."
exit 0
fi
fi
}
gencache() {
$awk '
BEGIN {
print "run=\"$1\"; shift"
print "case \"$run\" in"
}
{
sub(/#.*/, "") # Remove comments
if (!/^\s*$/) {
if (/^\+host/) {
sub(/\s*\+host\s*/, "")
h++
hosts[h] = $0
}
else {
if (!/^\t/) {
hostnum = 1
o++
opts[o] = $0
}
else {
sub(/^\t/, "")
if ($0 == "^")
$0 = cache
else if ($0 ~ /^[0-9]*$/)
$0 = cmds[hosts[$0]":"opts[o]]
cmds[hosts[hostnum]":"opts[o]] = cache = $0
hostnum++
}
}
}
}
END {
for (host in hosts) {
if (hosts[host] != "'`hostname`'")
continue
for (cmd in cmds) {
if (cmd ~ hosts[host] && cmds[cmd] && cmds[cmd] != "-") {
i = cmd
sub(/.*:/, "", cmd)
print "\t"cmd") "cmds[i]" \"$@\" & ;;"
}
}
}
print "\t*) command -v \"$run\" >/dev/null && exec \"$run\" \"$@\" || echo \"\\`$run${@:+ $@}\\` Does not exist or exited with an error\" ;;"
print "esac"
}
' $conf > $cache
chmod +x $cache
}
# Config file setup
confdir=${XDG_CONFIG_HOME:-~/.config}/launch
conf=$confdir/config
if [ ! -e $conf ]; then
mkdir -p $confdir
echo "#HOSTS\n+host $(hostname)\n\n#OPTS\ntest\n\techo \"Tested!\"" > $conf
echo "No config file exists! new config file created at $conf! Exiting\n"
printhelp
exit 1
fi
# Cache file setup
cachedir=${XDG_CACHE_HOME:-~/.cache}/launch
cache=$cachedir/cache
[ ! -e $cache ] && mkdir -p $cachedir && gencache
[ $conf -nt $cache ] && gencache
# Command line options
checkawk
case "$1" in
-g|--gen-cache) echo "Generating new cache: $cache"; gencache && cat $cache ;;
-h|--help|'') printhelp ;;
*) exec $cache "$@" ;; # Run
esac
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