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421snippet if
if [[ ${0} ]] ; then
echo ""
fi
endsnippet
snippet timestamped
(while [ 1 ] ; do echo command ; sleep 1; done) | awk '{ print strftime("\033[32m%Y-%m-%dT%H:%M:%S\033[0m"), $0 }'
endsnippet
snippet indented
indented() {
awk '{ print strftime(" "), \$0 }'
}
endsnippet
snippet echo-color
echo-color() {
local color
color="\$1"
shift
echo -e "\e[\${color};40;1mscript\e[30;40;1m:\e[\${color};40;1m \$@\e[0m"
}
echo-info() {
echo-color 32 "\$@"
}
echo-warn() {
echo-color 33 "\$@"
}
endsnippet
snippet readarray
local $1
if [[ -z "$inputvar" ]]; then
$1=()
else
readarray -t $1 <<< "$inputvar"
fi
endsnippet
snippet pythonscriptargs
python2 -c "import sys; print(sys.argv[1:])" "$@"
endsnippet
snippet perlscriptargs
perl -MData::Dumper -e '$Data::Dumper::Terse = 1; $Data::Dumper::Indent = 0; print Dumper(\@ARGV), "\n"' -- "$@"
endsnippet
snippet prelude
#!/bin/bash
set -eu
set -o pipefail
set +o posix
shopt -s inherit_errexit
###############################################################
# Main functions
###############################################################
some-func() {
:
}
###############################################################
# Infra
###############################################################
help() {
cat << EOF
EOF
}
main() {
if [[ "\$@" == "" ]] ; then
help
else
local func
func=\$(declare -F | awk '\$0 == "declare -f '\$1'"')
if [[ \${func} != "" ]] && [[ \${func} != "declare -f main" ]] ; then
"\$@"
else
>&2 echo "script: unknown command: \${1}"
return 1
fi
fi
}
main "\$@"
endsnippet
snippet heredoc
cat > filename << EOF
${0}
EOF
endsnippet
snippet pipe-heredoc-tab
command <<- EOF
${0}
EOF
endsnippet
snippet pipe-noeval-heredoc-tab
command <<- "EOF"
${0}
EOF
endsnippet
snippet trace
_trace_to_file() {
export PS4='\$(date "+%Y.%m.%d-%H:%M:%S.%N") \${BASH_SOURCE}:\${FUNCNAME[0]:+\${FUNCNAME[0]}():}\${LINENO}: '
exec 3<> \$1
BASH_XTRACEFD=3
set -x
}
endsnippet
snippet trace-pretty-stdout
PS4='\033[38;5;237m$(date "+%Y.%m.%d-%H:%M:%S.%N" | cut -c-23) \033[38;5;243m${BASH_SOURCE}\033[38;5;237m:${FUNCNAME[0]:+${FUNCNAME[0]}():}\033[38;5;243m${LINENO}\033[38;5;237m: \033[00m'
endsnippet
snippet rematch
if [[ "\${arg}" =~ ^root=(.*)$ ]]; then
echo "\${BASH_REMATCH[1]}"
fi
endsnippet
snippet arrayiter
local key
for key in "\${!array[@]}"; do
local value=\${array[\${key}]}
done
endsnippet
snippet escapeargs
escapeargs() {
local i
for i in "$@"; do
printf " %s" \'
printf "%s" "$i" | sed -E "s#'#'\\\''#g"
printf "%s" \'
done
}
endsnippet
snippet awkstdin
awk -f - ${inputfile} << EOF
BEGIN { max=0 } {
if (match(\$1, /^Patch([0-9]+)/, arr)) {
if (arr[1] > max) max = arr[1];
}
} END { print max }
EOF
endsnippet
snippet array-pop
unset 'array[-1]'
endsnippet
snippet argparse
local interactive=0
local positional=()
while [[ \$# != 0 ]] ; do
if [[ "\$1" =~ ^--(.*)\$ ]] ; then
shift
local param
param="\${BASH_REMATCH[1]}"
case \${param} in
interactive) interactive=1 ;;
*) "invalid parameter \${param}"; return 1 ;;
esac
else
positional+=("\$1")
shift
fi
done
set -- "\${positional[@]}"
endsnippet
snippet argparse-elab
main-params-parse() {
local _verbose=0
local _debug=0
while [[ \$# != 0 ]] ; do
if [[ \$1 =~ ^-[a-zA-Z0-9]+\$ ]] ; then
for ((i=2;i<=\${#1};i++)); do # Iterate characters
local c=\${1:\$i-1:1}
case \${1:\$i-1:1} in
v) _verbose=1 ;;
d) _debug=1 ;;
*) echo "Invalid parameter \${c}" ; return -1 ;;
esac
done
shift
elif [[ "\$1" == "--verbose" ]] ; then
_verbose=1
shift
continue
elif [[ "\$1" == "--debug" ]] ; then
_debug=\$1
shift
continue
fi
break # Continue to positional arguments
done
verbose=\${_verbose}
remaining_args=("\$@")
}
main-params-parse "\$@" # Outputs remaining_args
set +u ; set -- "\${remaining_args[@]}" ; set -u
endsnippet
snippet perline-parse
while read a b ; do
echo ${a} ${b}
done < <(command)
endsnippet
snippet sigint
trap ctrl_c INT
function ctrl_c() {
${0}
}
endsnippet
snippet stderr
>&2 echo "error"
endsnippet
snippet tempdir
local tmp_dir=$(mktemp -d -t prefix-XXXXXXXXXX)
# Stuff
rm -rf ${tmp_dir}
endsnippet
snippet oldarrayeval
\${${1}[@]+"${${1}[@]}"}
endsnippet
snippet bashrpc
__receiver-rpc() {
# Decode command and args
local decoded_args=()
while IFS= read var ; do
decoded_args+=("\${var}")
done < <(perl -e 'print pack("H*", \$_), "\n" for @ARGV' "\$@")
# Execute them
"\${decoded_args[@]}"
}
__this-script-with-copy() {
if [[ "\${THIS_SCRIPT:-}" != "" ]] ; then
echo THIS_SCRIPT=\${THIS_SCRIPT}
echo \${THIS_SCRIPT} | perl -pE '\$_=pack("H*",\$_)' | tr -d '\240'
else
echo THIS_SCRIPT=\$(perl -pE '\$_=unpack("H*",\$_)' \${BASH_SOURCE})
cat \${BASH_SOURCE}
fi
}
rpc() {
local node
node="\$1"
shift
__this-script-with-copy | \
ssh \${node} 'bash -s -- __receiver-rpc '\$(perl -e 'print unpack("H*", \$_), "\n" for @ARGV' "\$@")
}
endsnippet
snippet spawnjobs
local pids=()
local pid_work=()
local work
for work in a b c; do
some-work &
pids+=(\$!)
pid_work+=("${work}")
done
local idx
local failed_names=()
for idx in "\${!pids[@]}"; do
local e
set +e
wait \${pids[\${idx}]}
e=\$?
set -e
if [[ "\${e}" != "0" ]] ; then
failed_names+=(\${pid_work[\${idx}]})
fi
done
if [[ \${failed_names[@]+"\${failed_names[@]}"} != "" ]] ; then
echo "Some failed: \${failed_names[@]}"
return 1
fi
echo All succeeded
endsnippet
snippet clean-background-on-termination
function leave() {
kill $(jobs -p)
wait $(jobs -p) 2>/dev/null || true
}
trap leave EXIT
endsnippet
snippet scriptpath
local scriptpath
scriptpath=$(dirname $(realpath ${BASH_SOURCE}))
endsnippet
snippet runparameterized
#!/bin/bash
# export KEY=VAL
exec $(realpath $(dirname ${BASH_SOURCE}))/run "\$@"
endsnippet
snippet params-ssh-relay
local params
params=$(python3 -c "import sys; print(repr(sys.argv[1:]).encode('utf-8').hex())" "$@")
ssh -t ${host} "exec python3 -c 'import sys, os; a = eval(bytes.fromhex(sys.argv[1])); os.execlp(a[0], *a)' ${params}"
endsnippet
snippet to-hex
$(echo -n "$1" | perl -ne 'print unpack("H*", \$_)')
endsnippet
snippet from-hex
"$(echo -n "$1" | perl -ne 'print pack("H*", \$_)')"
endsnippet
snippet embed-python3
python3 -c "
import sys, os
print('hello')
"
endsnippet
snippet is-empty-dir
is-empty-dir() {
if [[ "\$(find "$1" -maxdepth 2 -mindepth 1 | wc -l)" == "0" ]] ; then return 0; fi
return 1
}
endsnippet
snippet detached
__run-detached() {
tmp_dir_to_delete="\$1"
shift
function leave() {
case ${tmp_dir_to_delete} in
/tmp/*)
rm -rf ${tmp_dir_to_delete}
;;
esac
}
trap leave EXIT
"$@"
}
detached() {
# Copy the script aside and run it from tmp
local tmp_dir=$(mktemp -d -t syslab-XXXXXXXXXX)
cp ${BASH_SOURCE} ${tmp_dir}/syslab
exec ${tmp_dir}/syslab __run-detached ${tmp_dir} "$@"
}
endsnippet
snippet simplekv
local example
local arg
for arg in "\$@"; do [[ $arg =~ ^([a-zA-F0-9_]+)=(.*)$ ]] && eval "${BASH_REMATCH[1]}=${BASH_REMATCH[2]}"; done
[[ "\$example" == "0" ]] || echo example
endsnippet
snippet sequence
main() {
local a=()
while [[ \$# != 0 ]] ; do
if [[ "$1" =~ ^--$ ]] ; then
"${a[@]}"
shift
a=()
continue
fi
a+=("\$1")
shift
done
"${a[@]}"
}
main "$@"
endsnippet