Handle stale data in ens-forecast brief in xmobar

.config/xmobar/ens_brief.sh

@@ -1,9 +1,38 @@
 #!/bin/bash
 # Next day from ens-forecast for xmobar, e.g. "Sat 19/10°  39%" (today before 18:00, then tomorrow)
 # With "week": show the next 7 days in a notification (for a click on the bar)
+# Uses IFS unless its newest saved run is STALE; then the first fallback in MODELS whose download names its
+# run and isn't STALE. The bar names the model when it isn't IFS, and adds a red "!" when it is stale.
+# AIFS/AIGEFS are left out: AIFS comes through the same ECMWF pipeline as IFS and fails with it.
+
+MODELS=(ecmwf_ifs025 ncep_gefs025 icon_seamless_eps google_weathernext2_ensemble)
+declare -A LABEL=([ncep_gefs025]=GEFS [icon_seamless_eps]=ICON [google_weathernext2_ensemble]=Google)
+
+# pick DAYS: sets $line (the --brief output) and $model. IFS unless it is STALE; a fallback only if its
+# download names its run (so it can be checked) and isn't STALE; otherwise IFS anyway.
+pick() {
+    local m l head first="" first_model="" err=""
+    for m in "${MODELS[@]}"; do
+        if ! l=$(ens-forecast --brief "$1" --model "$m" 2>&1); then
+            [[ -z $err ]] && err=$l
+            continue
+        fi
+        l=$(grep -v '^note: ' <<< "$l")    # e.g. "note: ... forecasts only 10 days" (on stderr, models < 14 days)
+        [[ -z $first ]] && first=$l first_model=$m
+        head=${l%%: *}
+        [[ $m != "${MODELS[0]}" && $head != *", run "* ]] && continue    # unlabelled fallback: can't check
+        if [[ $head != *STALE* ]]; then
+            line=$l model=$m
+            return 0
+        fi
+    done
+    if [[ -n $first ]]; then line=$first model=$first_model; return 0; fi
+    line=$err
+    return 1
+}
 
 if [ "$1" = "week" ]; then
-    if ! line=$(ens-forecast --brief 7 2>&1); then
+    if ! pick 7; then
         notify-send "ens-forecast" "$line"
         exit
     fi
@@ -17,6 +46,10 @@ if [ "$1" = "week" ]; then
     exit
 fi
 
-line=$(ens-forecast --brief 1 2>/dev/null) || exit 0
+pick 1 2>/dev/null || exit 0
 read -r day temps rain <<< "${line#*: }"
-echo "$day ${temps%C} "$'\uf043'" $rain"
+label=""
+[[ $model != "${MODELS[0]}" ]] && label="${LABEL[$model]:-$model} "
+stale=""
+[[ ${line%%: *} == *STALE* ]] && stale=" <fc=#f7768e>!</fc>"
+echo "$label$day ${temps%C} "$''" $rain$stale"