96 lines
2.5 KiB
Bash
96 lines
2.5 KiB
Bash
#!/usr/bin/env bash
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if [[ -v IS_SOURCED_UTIL ]]; then return 0; fi
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IS_SOURCED_UTIL=1
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# Show the usage if requested and exit
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maybe_show_usage_and_exit() {
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local -r arg="${1}"
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if [[ "${arg}" =~ ^(-h|-(-)?help)$ ]]; then
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printf %s "${USAGE:-No help}" 1>&2
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exit 0
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fi
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}
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# Get the ms since the epoch until now
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tick_now() {
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local -r out_name="${1}"
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printf -v "${out_name}" %.0f "$(date +%s.%N)"e3
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}
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# Get the ms since the epoch until the given at spec
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tick_at() {
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local -r out_name="${1}" at_spec="${2}"
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local -i now_ms now_s h m s s_to_d
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tick_now now_ms
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if [[ "${at_spec}" =~ ^[0-9]+$ ]]; then
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printf -v "${out_name}" %d $((now_ms + at_spec))
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else
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now_s=$((now_ms / 1000))
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case "${at_spec}" in
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m)
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printf -v "${out_name}" %d $(((now_s + 60 - now_s % 60) * 1000))
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;;
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h)
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printf -v "${out_name}" %d $(((now_s + 3600 - now_s % 3600) * 1000))
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;;
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d)
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# Work off the local time to account for the timezone since the
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# epoch is aligned to a UTC day boundary
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read -r h m s < <(date +'%H %M %S')
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s_to_d=$(((24 - h) * 3600 - m * 60 - s))
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printf -v "${out_name}" %d $(((now_s + s_to_d) * 1000))
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;;
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*)
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return 1
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;;
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esac
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fi
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}
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# Get the ms from now until the given ms since the epoch
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ms_until() {
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local -r out_name="${1}" until_ms="${2}"
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local -i now_ms
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tick_now now_ms
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printf -v "${out_name}" %d $((until_ms - now_ms))
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}
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# Convert integer milliseconds to floating point seconds
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ms_to_s() {
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local -r out_name="${1}"
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local -ri ms="${2}"
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printf -v "${out_name}" %.3f "${ms}e-3"
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}
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# Map the module file name to the module function
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mod_to_fn() {
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local -r out_name="${1}" file_name="${2}"
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printf mod_%s "${file_name//-/_}"
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}
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# Get the pid of the ancestor process with the given name
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root_pid() {
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local -r out_name="${1}"
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local -ri pid="${2:-$$}"
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local -r root_name="${3:-login}"
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local -i current_pid="${pid}"
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local name
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while [[ "${current_pid}" -ne 1 ]]; do
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if [[ ! -r "/proc/${current_pid}/status" ]]; then return 1; fi
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mapfile info < \
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<('grep' --null -E -m 2 '^(Name|PPid):' "/proc/${current_pid}/status" \
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| 'sort' | 'cut' -f 2)
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name="${info[0]##[[:space:]]}"
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name="${name%%[[:space:]]}"
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if [[ "${name}" = "${root_name}" ]]; then
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printf -v "${out_name}" %s "${current_pid}"
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return 0
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fi
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current_pid="${info[1]##[[:space:]]}"
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current_pid="${current_pid%%[[:space:]]}"
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done
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return 1
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}
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