A wrapper script for i3-agenda used to show the output in SwiftBar.

agenda.15m.sh

#!/bin/bash
# <swiftbar.hideAbout>true</swiftbar.hideAbout>
# <swiftbar.hideRunInTerminal>true</swiftbar.hideRunInTerminal>
# <swiftbar.hideLastUpdated>true</swiftbar.hideLastUpdated>
# <swiftbar.hideDisablePlugin>true</swiftbar.hideDisablePlugin>

# max attempts count
max_attempts=5
# number of lines to interpret as error message
error_threshold=5

error_counter=0

run-command(){
    output="$($@ 2>&1)"

    if [[ $(echo "$output" | wc -l) -gt $error_threshold ]]; then

        # retry every 15 seconds for max_attempts times
        if [[ $error_counter -lt $max_attempts ]]; then
            sleep 15
            ((error_counter++))
            run-command $@
        else
            echo "error"
            export error_msg="$output"
        fi

    else
        echo "$output"
    fi
}

run-command ~/bin/agenda
echo "---"
href="href='https://calendar.google.com/calendar/u/0/r/'"

i=1
while :; do 
    event=$(run-command /usr/local/bin/python $HOME/Projects/i3-agenda/i3_agenda/__init__.py -c $HOME/.i3agenda/client.json -ttl 30 --limchar 30 --skip $i --today | pybidi)
    ((i++))
    if [[ "$event" == "No events" ]]; then
        exit 0
    fi
    if [[ "$event" == "error" ]]; then
        echo "$error_msg"
        exit 1
    fi
    echo "$event | $href"
done