Alpine - list upgradeable packages in a nice coloured table

lu.sh

#!/bin/sh

echo 'Updating repository data ...'
apk update

# List upgradeable packages into a temporary file
apk list --upgradeable | sed -e 's/{//g' -e 's/}//g' -e 's/]//g' > /tmp/apk-upgradeable

# Add column headers
echo 'Package,Installed Version,New Version' > /tmp/apk-upgradeable-final

# Iterate over the file and remove the license stuff in the middle
while read line
  do
    # existing package
    section1=$(echo ${line} | cut -d ' ' -f 1)
    section2=$(echo ${line} | cut -d \) -f 2)
    newver=$(echo ${section1} | rev | cut -d '-' -f 1-2 | rev)
    name=$(echo ${section1} | rev | cut -d '-' -f 3- | rev)
    oldver=$(echo ${section2} | rev | cut -d '-' -f 1-2 | rev)
    echo "${name},${oldver},${newver}" >> /tmp/apk-upgradeable-final
done < /tmp/apk-upgradeable

# Set the file variable as the file passed.
file=/tmp/apk-upgradeable-final

# Colours (just comment out or set to blank for no colour)
lineColour1='\e[1;30m'
lineColour2=''
headerColour='\e[1;33m'
borderColour='\e[3;34m'

# Clean up temp file if it exists before starting
# TODO use a bash array to store this data
if [[ -f /tmp/table-column-sizes ]];then rm /tmp/table-column-sizes;fi

# Get total lines in the csv file
total=$(wc -l ${file} | cut -d ' ' -f 1)

# Find longest line for each column
i=1
while true
  do
    if [[ ${i} -eq ${total} ]];then break;fi
    echo $(cat ${file} | cut -d , -f ${i} | wc -L | cut -d ' ' -f 1) >> /tmp/table-column-sizes
    i=$(( i + 1 ))
done

# Get total number of columns
commas=$(head -n 1 ${file} | sed 's/[^,]//g' | awk '{ print length }')
columns=$(( ${commas} + 1 ))

# Print the header
function print_header {
  printf "${borderColour}┌"
  for x in $(seq 1 ${columns})
    do
    maxTmp=$(sed "${x}q;d" /tmp/table-column-sizes)
    max=$(expr ${maxTmp} + 2)
      for o in $(seq 1 ${max})
        do printf '─'
      done
      if [[ ${x} -eq ${columns} ]];then printf '┐\n';else printf '┬';fi
  done
  
  printf '│\e[0m'
  for header in $(seq 1 ${columns})
    do
      headertext=$(head -n 1 ${file} | cut -d , -f ${header})
      printf " ${headerColour}%s\e[0m" "${headertext}"
      # Print padding
      textlen=$(echo ${headertext} | wc -c)
      maxTmp=$(sed "${header}q;d" /tmp/table-column-sizes)
      max=$(expr ${maxTmp} + 3)
      diff=$(expr ${max} - ${textlen} - 1)
      for k in $(seq 1 ${diff})
        do
          printf ' '
      done
      printf "${borderColour}│\e[0m"
  done
  printf '\n'
  printf "${borderColour}├"
  for a in $(seq 1 ${columns})
    do
      maxTmp=$(sed "${a}q;d" /tmp/table-column-sizes)
      max=$(expr ${maxTmp} + 2)
      for b in $(seq 1 ${max})
        do printf '─'
      done
      if [[ ${a} -eq ${columns} ]];then printf '┤\e[0m\n';else printf '┼';fi
  done
}

# Print each row
function print_data {
  line=${1}
  printf "${borderColour}│\e[0m"
  for data in $(seq 1 ${columns})
                do
                datatext=$(sed "${line}q;d" ${file} | cut -d , -f ${data})
                if [[ ${fancy} == 'true' ]]
                  then
                    printf " ${lineColour1}%s\e[0m" "${datatext}"
                  else
                    printf " ${lineColour2}%s\e[0m" "${datatext}"
                fi
                # Print padding
                textlen=$(echo ${datatext} | wc -c)
        maxTmp=$(sed "${data}q;d" /tmp/table-column-sizes)
        max=$(expr ${maxTmp} + 3)
                diff=$(expr ${max} - ${textlen} - 1)
                for k in $(seq 1 ${diff})
                do
                        printf ' '
                done
                printf "${borderColour}│\e[0m"
  done
  printf '\n'
}

# Iterate over each row in the CSV file
i=1
while true
  do
    if [[ $((${i} % 2)) -eq 0 ]];then fancy=false;else fancy=true;fi
    if [[ ${i} -eq 1 ]];then print_header;else print_data ${i};fi
    if [[ ${i} -eq ${total} ]];then break;fi
    i=$(( i + 1 ))
done

# Print the bottom of the table
printf "${borderColour}└"
for g in $(seq 1 ${columns})
  do
    maxTmp=$(sed "${g}q;d" /tmp/table-column-sizes)
    max=$(expr ${maxTmp} + 2)
    for h in $(seq 1 ${max})
      do printf '─'
    done
    if [[ ${g} -eq ${columns} ]];then printf '┘\n\e[0m';else printf '┴';fi
done

# Clean up temp file
if [[ -f /tmp/table-column-sizes ]];then rm /tmp/table-column-sizes;fi

# Print hostname so user knows if they're on a remote device
echo "Hostname: $(hostname)"

# Ask if user wants to proceed with the upgrade
read -p 'Upgrade (yes/no): ' ans

if [[ ${ans} == 'yes' ]]
  then
    echo "Beginning upgrade ..."
    apk upgrade -a
  else
    echo "Aborting"
fi