56 lines
2.0 KiB
Bash
Executable File
56 lines
2.0 KiB
Bash
Executable File
#!/usr/bin/env bash
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# Print the current weather as a short icon+temp string, e.g. "🌦️ +83°F",
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# plus -- in --json mode (for waybar) a multi-line "current conditions"
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# tooltip. A single cached wttr.in response is served immediately -- even when
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# stale -- and refreshed in the background, so a slow network never delays the
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# lock screen's first frame or waybar's tooltip. Override the location with
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# WEATHER_CITY or edit CITY below.
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set -u
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CITY="${WEATHER_CITY:-Denver}"
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CACHE_DIR="${XDG_RUNTIME_DIR:-/tmp}"
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CACHE="${CACHE_DIR}/wttr.cache"
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CACHE_MAX_AGE=1800 # 30 minutes
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# First line is the waybar text; the following lines are the hover tooltip.
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FORMAT='%c+%t%5Cn%5Cn%C%5CnTemperature:+%t+%28feels+like+%f%29%5CnHumidity:+%h%5CnWind:+%w%5CnPrecipitation:+%p%5CnPressure:+%P%5CnUV+index:+%u'
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URL="https://wttr.in/${CITY}?format=${FORMAT}"
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fetch() {
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TMP="${CACHE}.tmp.$$"
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if curl -fsS --connect-timeout 2 --max-time 5 "${URL}" > "${TMP}" 2>/dev/null; then
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mv "${TMP}" "${CACHE}"
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cat "${CACHE}"
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else
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rm -f "${TMP}" || true
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return 1
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fi
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}
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# Fresh cache: use it as-is.
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if [ -f "${CACHE}" ] && [ "$(( $(date +%s) - $(stat -c %Y "${CACHE}") ))" -lt "${CACHE_MAX_AGE}" ]; then
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BODY="$(cat "${CACHE}")"
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# Stale cache: use it immediately, then refresh in the background so the
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# caller never blocks. flock keeps a pile-up of refreshes from several clients
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# (lock screen, waybar) from running concurrent curls.
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elif [ -f "${CACHE}" ]; then
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BODY="$(cat "${CACHE}")"
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(
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exec 9>"${CACHE}.lock"
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flock -n 9 || exit 0
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fetch >/dev/null 2>&1
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) &
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disown
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# No cache at all: fetch synchronously, but with tight timeouts.
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else
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BODY="$(fetch)"
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fi
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if [ "${1:-text}" = "--json" ]; then
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TEXT="$(printf '%s' "${BODY}" | head -n 1)"
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TOOLTIP="$(printf '%s' "${BODY}" | tail -n +2)"
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jq -nc --arg text "${TEXT}" --arg tip "${TOOLTIP}" '{text: $text, tooltip: $tip}'
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exit 0
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fi
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printf '%s' "${BODY}" | head -n 1
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