Create text files with parsed data, suitable for import into Google Groups.

extractor.sh

#!/usr/bin/env bash
#
# extractor
#
# Create text files with parsed data, suitable for import into Google Groups.
#
# Author: M. Krinitz <mjk235 [at] nyu [dot] edu>
# Date: 2021.05.15
# License: MIT

#######################
# Note on mailing lists
#######################

# "Ideal case" mailing list takes the form:

# # list-o-steves 
# # 
# Stephen Gary Wozniak <imalegend@example.com>
# Stephen William Hawking <imaboygenius@example.com>
# Steven Anthony Ballmer <imapc@example.com>
# Steve Austin <imastonecoldsunofagun@example.com>
# Steven Paul Jobs <imamac@example.com>
# Stevland Hardaway Morris <imawonder@example.com>

# For reference: 
# https://support.google.com/a/answer/9400087?hl=en&visit_id=638157825756116575-2877305235&rd=1#zippy=%2Cupload-users-from-a-csv-file

###########
# Variables
###########

domain="example.com"
file_type="csv"
timestamp=$(date "+%b %d %X")

###########
# Functions
###########

# Make file
# e.g.: ste.filetype

# Headers
# Row 1: Group email
# e.g.: username@example.com
# Row 2: Column headers
# e.g.: Group Email [Required], Member Email, Member Type, Member Role, Member Name

make_file () {

  printf "%s\n" "creating: $file.$file_type with headers..."
 
  printf "%s\n" "$file@$domain" > "$file"."$file_type"
  printf "%s\n" "Group Email [Required], Member Email, Member Type, Member Role, Member Name" >> "$file"."$file_type"

}

# Parse list
# grep to ignore lines starting with: '#'
# pipe to awk
# awk set offset character to comma (,)
# then use field separator " " (one (1) blank space)
# then add: one (1) blank space, last column, add USER, add MEMBER, add first column
# e.g.: ,<username@example.com>,USER,MEMBER,Steve

parse_list () {

  printf "%s\n" "parsing list: $file..."
  
  grep "^[^#]" "$file" | awk -v OFS=, -F " " '{print "", $NF, "USER", "MEMBER", $1}' >> "$file"."$file_type"

}

# Iterate
# If file in pwd is directory or symbolic link, skip
# else do the dew.

iterate () {

  for file in *; do

    if [[ -d "$file" || -L "$file" ]]; then

      printf "%s\n" "The item: $file is a directory or symbolic link, skipping..."

    else [[ -f "$file" ]]

      printf "%s\n" "The item: $file is a file, continuing..."
      
      filter_list
      make_file
      parse_list
fi
done

}

# Exit status check
# If non-zero (0) exit status, DANGER

exit_status () {

  if [[ $retVal -ne 0 ]]; then

    printf "%s\n" "ACHTUNG!!! Something went wrong, homie."

  else

    printf "%s\n" "Done. Exiting @ $timestamp."

  fi

}

# Main function

main () {
 
  printf "%s\n" "Running: extractor.sh @ $timestamp."

  iterate

}

main "$@"

retVal=$?
exit_status