gcgetics.sh - Extract cids and ics links from google embedded calendars
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.editorconfig
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.editorconfig
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root = true
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[*.sh]
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charset = utf-8
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indent_style = space
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indent_size = 2
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# icsutils
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Tools to work with ics files in bash.
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Tools to work with ics files in bash.
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* `gcgetics.sh` : Extract google calender IDs and ICS links from given embedded google calendar
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165
gcgetics.sh
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165
gcgetics.sh
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#!/usr/bin/env bash
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# Author: Martin Winkler
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# License: Please refer to the repository
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# Origin: https://winklerfamilie.eu/git/SmallThings/icsutils.git
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# Exit on error. Append "|| true" if you expect an error.
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set -o errexit
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# Exit on error inside any functions or subshells.
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set -o errtrace
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# Do not allow use of undefined vars. Use ${VAR:-} to use an undefined VAR
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set -o nounset
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# Catch the error in case mysqldump fails (but gzip succeeds) in `mysqldump |gzip`
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set -o pipefail
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# gc = google calendar
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gc::getIcsUsage() {
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cat <<USAGE_END
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Usage: ${0##*/} [OPTIONS] [URL/FILE]
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Parses a google calendar embbeded URL content for any number
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of containted google calendar id (cid).
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[OPTIONS]
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--file, -f : Input is a file containing a previous curl
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of a google calendar embbeded link.
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--help, -h : Show this help.
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-- : End of Options.
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[URL/FILE]
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Such a URL usually starts with:
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"https://calendar.google.com/calendar/../embed?"
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Where ".." may be empty or a more specific reference.
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If [URL/FILE] is empty or "-", standard input is used.
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USAGE_END
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}
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gc::makeIcsUrl() {
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# Exclude public holiday calendar
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local rexHoliday='group\.v\.calendar'
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[[ "${1:?}" =~ $rexHoliday ]] && return 1
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echo "https://calendar.google.com/calendar/ical/${1}/public/basic.ics"
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}
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gc::findcid() {
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local arg=""
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local content=""
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local file=0
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local cids=()
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local title=()
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local color_green= ; [ -t 1 ] && color_green='\033[1;32m'
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local color_blue= ; [ -t 1 ] && color_blue='\033[1;34m'
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local color_red= ; [ -t 1 ] && color_red='\033[2;31m'
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local color_less= ; [ -t 1 ] && color_less='\033[0m'
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for arg in "${@}" ; do
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case "$1" in
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--file|-f)
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file=1
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shift 1 ;;
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--)
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shift && break ;;
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esac
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done
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if [[ "${1}" = "-" ]] || [ -z "${1}" ] ; then
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file=1
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shift
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fi
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if (( file )) ; then
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content=$(<"${1:-"/dev/stdin"}")
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else
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# could grep for "cids", but unsure if result is always on one line
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content="$(curl --silent -L "${1:-}")"
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fi
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while IFS= read -r line || [[ "${line}" ]] ; do
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cids+=("${line}")
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done < <(grep -oP '(?<=")[^"]*@(group|group\.v)\.calendar\.google\.com(?=")' <<<"${content}")
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while IFS= read -r line || [[ "${line}" ]] ; do
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title+=("${line}")
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done < <(grep -oP '(?<="title":")[^"]*(?=")' <<<"${content}")
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for i in "${!cids[@]}" ; do
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printf '%12s: %b%s%b\n' "Title" "${color_green}" "${title[$i]}" "${color_less}"
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printf '%12s: %s\n' "Calendar ID" "${cids[$i]}"
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printf '%12s: %b' "ICS Url" "${color_blue}"
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gc::makeIcsUrl "${cids[$i]}" || printf '%b\n' "${color_red}No ics file for this calendar${color_less}"
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printf '%b' "${color_less}"
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echo
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done
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}
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gc::getIcs() {
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local arg=
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local element=
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local opt=""
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readonly shortMax=80
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local shortEnd=0
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local color_yellow= ; [ -t 1 ] && color_yellow='\033[1;33m'
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local color_less= ; [ -t 1 ] && color_less='\033[0m'
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# shellcheck disable=SC2034 # arg not used
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for arg in "${@}" ; do
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case "$1" in
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--help|-h)
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gc::getIcsUsage
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return 0 ;;
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--file|-f)
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opt="-f"
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shift ;;
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--)
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shift && break ;;
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esac
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done
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local args=("${@}")
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# Use standard input if no files are present
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[ $# -eq 0 ] && args[0]="-"
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for element in "${args[@]}" ; do
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if [[ $# -gt 1 ]] ; then
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printf "%b## CID information from: " "${color_yellow}"
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# Shorten the URL of PATH if it is greater than $shortMax
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if [[ ${#element} -gt ${shortMax} ]] ; then
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shortEnd=$((${#element} - shortMax/2))
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printf '%s[...]%s' \
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"${element:0:$((shortMax/2))}" \
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"${element:${shortEnd}:${#element}}"
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else
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printf '%s' "${element}"
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fi
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printf '%b\n\n' "${color_less}"
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fi
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gc::findcid ${opt} "${element}"
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done
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}
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### Check if script is _sourced
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### https://stackoverflow.com/a/28776166
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_sourced=0
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if [ -n "${ZSH_EVAL_CONTEXT:-}" ]; then
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case ${ZSH_EVAL_CONTEXT:-} in *:file) _sourced=1;; esac
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elif [ -n "${KSH_VERSION:-}" ]; then
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[ "$(cd "$(dirname -- "$0")" && pwd -P)/$(basename -- "$0")" \
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!= "$(cd "$(dirname -- "${.sh.file}")" && pwd -P)/$(basename -- "${.sh.file}")" ] && _sourced=1
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elif [ -n "${BASH_VERSION:-}" ]; then
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(return 0 2>/dev/null) && _sourced=1
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else # All other shells: examine $0 for known shell binary filenames
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# Detects `sh` and `dash`; add additional shell filenames as needed.
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case ${0##*/} in sh|dash) _sourced=1;; esac
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fi
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###
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if (( ! _sourced )); then
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gc::getIcs "${@}"
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fi
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