remind entry to ics with selection

select_remind_entry.sh

#!/bin/bash

#
# The following script is a ugly hack. But it works, so yeah \m/
#
# It uses awk, cut, head, tail, rem2ics and fzf (whereas this is only for the 
# selection-process and could be replaced).
#
# Purpose:
#
# Let the user select one of his remind calendar entries (nicely formatted, though)
# and export this entry to ics.
#
# Note:
# The format the script prints in the selection process is the following:
#
#    <number> | <date> | <time (optional)> | <description>
#
# The number is lateron used to re-retreive the entry from remind. If the calendar
# in remind changes in between, this WON'T WORK.
# 
# License
#
# Licensed under MIT
# (c) Matthias Beyer
#

select_entry() {
    rem -s | awk '
    function fmtdate(d) {
        return gensub(/([0-9]{4})\/([0-9]{2})\/([0-9]{2})/, "\\3-\\2-\\1", "", d);
    }

    function extract(str,x) {
        return gensub(/(.*)(([0-9]+|\*)\ )+(|([0-9]+:[0-9]+[apm]*-[0-9]+:[0-9]+[apm]*)) *(.*)/, x, "", str);
    }

    function extractDesc(str) {
        return extract(str, "\\6");
    }

    function extractTime(str) {
        return extract(str, "\\4");
    }

    BEGIN {
        n=1;
    }

    {
        printf "%i ", n

        for (nl = length(n); nl < 5; nl++) {
            printf " "
        }

        printf "| "
        n++;

        printf "%s | ", fmtdate($1)

        if (length(extractTime($0)) == 0) {
            for(i=0;i<=14;i++) {
                printf " "
            }
        } else {
            t = extractTime($0)
            l = length(t)
            printf "%s", extractTime($0)
            for(;l<15;l++) {
                printf " "
            }
        }

        printf " | %s\n", extractDesc($0);
    }
    ' | fzf | cut -d " " -f 1
}

n=$(select_entry)
rem -s | head -n $n | tail -n 1 | rem2ics -do 2>/dev/null > attachement.ics