rndmemitem

#!/bin/bash
#
# Brings up questions before showing you answers. Good for regular review of fast memory items.
# Needs a .csv file as input to read from.
# The .csv file must be separated by ";" and have the first field as the question, second field as the answer.
# E.g., 
# A;Alfa
# B;Bravo
# C;Charlie
#
# or
#
# Covid;Hands;Face;Space
# etc.

if [[ "$1" == "" ]]
then
 echo "Usage: rndmemitem <.csv file>"
 exit 1
fi

if [[ ! -f "$1" ]]
then
 echo "File $1 not found."
 exit 1
fi

bname=`basename "$1"`
elej=${bname%.*}

# echo "basename: $bname"
# echo "elej: $elej"

k=$elej`date +%N`.txt

# Random order of the file. 
shuf "$1" > /tmp/$k

# Number of question fields (i.e., lines).
# lines=`wc -l /tmp/$k | awk '{ print($1) }'`

# Main part, go through lines, ask question then show answers. Haven't found a nice way to pause awk without newline so doing it with sed instead.

IFS=";"

while read line
do
 #echo "Record is : $line"
# count number of fields
 nfields=`echo "$line" | tr ';' '\n' | wc -l`
 nfieldsm=$(( $nfields - 1 ))

# Make an array out of line, notice IFS above
 read -a larr <<< "$line"
# # echo "${larr[@]}"

# Echo the question, followed by ":"
 echo -n "${larr[0]}: "
# NOTICE for read: file is given as input to read (after closing while)!! Hence the <&1 to read from st input
 read -n1 -s <&1

# All answers still in the same line one by one, except the last one
 for ((i=2; i<=$nfieldsm; i++))
 do
  im=$(( $i - 1 ))
  echo -n "${larr[im]} "
  read -n1 -s <&1
 done

# Last answer will add newline
 echo "${larr[$nfieldsm]}"
done < /tmp/$k

# This was an old version with awk, only displays one answer
# i=0
# while [ $i -lt $lines ]
# do
#  i=$(($i+1))
#  sed -n "${i}p" /tmp/$k | 
#  awk -F\; '{
#   printf ($1"	")
#  }'
#  read -n1 -s
#  sed -n "${i}p" /tmp/$k | 
#  awk -F\; '{
#   print ($2)
#  }'
# done

rm /tmp/$k