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#!/bin/bash
###
# Single pass tabulate.
#
# Turn grid-aligned tables into tab-separated values
# using the first line as a template.
# Pre-existing tabs are preserved,
# which is probably not good.
##
# TODO:
# - Optionally require more than one space for column separation.
shopt -s extglob
spitline(){
declare -i prevtab=0
for tabstop in ${tabstops[@]}
do
# Strip trailing spaces.
field=${line:$prevtab:$((tabstop-prevtab))}
field=${field%%*( )}
printf '%s\t' "$field"
prevtab=$tabstop
done
printf '%s\n' "${line:$prevtab}"
}
##
# First line:
##
# The tab stops are where stretches of empty space end.
IFS=$'\n'
read -r firstline
declare -i skip=1
for ((i=0;i<${#firstline};i++))
do
case ${firstline:$i:1} in
\ )
skip=0
;; *)
[[ $skip -eq 0 ]] && tabstops+=($i)
skip=1
esac
done
#echo >&2 ${tabstops[@]}
line=$firstline
spitline
##
# All other lines:
declare -i prevtab
while read -r line
do spitline
done
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