#!/bin/sh

# Adapted from mosh https://unix.stackexchange.com/a/389119

# The colorizing doesn't work for me, but I've left it in

# in case it turns out to work in some cases.

# For a simpler solution, zipgrep can search epubs.

PAT=${1:?"Usage: grep-epub PAT *.epub files to grep"}

shift

: ${1:?"Need epub files to grep"}

if [ $# -ge 1 ]; then

extra="--with-filename"

else

extra=

fi

for i in $* ;do

output=$(

unzip -p $i "*.htm*" "*.xml" "*.opf" | # unzip only html and content files to stdin

perl -lpe 's![<][^>]{1,200}?[>]!!g;' | # get rid of small html <b>tags

grep -Piaso ".{0,30}$PAT.{0,30}" | # keep some context around matches

grep -Pi --color "$PAT" # color the matches.

)

if [ x"$output" != x ]; then

echo "======" $i

echo $output

echo

fi

done