lesspreprocess

#!/bin/bash
# This is a preprocessor for 'less'.  It is used when this environment
# variable is set:   LESSOPEN="|lesspipe %s"

function preprocess {
    filename="$1"
    case "$filename" in
        (*.tar) tar tvvf "$filename" 2>/dev/null ;;
        (*.tgz) tar tzvvf "$filename" 2>/dev/null ;;
        (*.tar.bz2) bzip2 -cd "$filename" "$1" 2>/dev/null | tar tvvf - ;;
        (*.tar.gz) tar tzvvf "$filename" 2>/dev/null ;;
        (*.tar.Z) tar tzvvf "$filename" 2>/dev/null ;;
        (*.tar.z) tar tzvvf "$filename" 2>/dev/null ;;
        (*.bz2) bzip2 -dc "$filename"  2>/dev/null ;;
        (*.Z) gzip -dc "$filename"  2>/dev/null ;;
        (*.z) gzip -dc "$filename"  2>/dev/null ;;
        (*.gz) gzip -dc "$filename"  2>/dev/null ;;
        (*.zip) unzip -l "$filename" 2>/dev/null ;;
        (*.1|*.2|*.3|*.4|*.5|*.6|*.7|*.8|*.9|*.n|*.man)
            FILE="$(file -L "$filename")"
            FILE="$(echo "$FILE" | cut -d ' ' -f 2)"
            [ "$FILE" = 'troff' ] \
            && groff -s -p -t -e -Tascii -mandoc "$filename"
        ;;
        (*.awk|*.groff|*.java|*.js|*.m4|*.php|*.pl|*.pm|*.pod|*.sh|\
         *.ad[asb]|*.asm|*.inc|*.[ch]|*.[ch]pp|*.[ch]xx|*.cc|*.hh|\
         *.lsp|*.l|*.pas|*.p|*.xml|*.xps|*.xsl|*.axp|*.ppd|*.pov|\
         *.diff|*.patch|*.py|*.rb|*.sql|*.ebuild|*.eclass)
            pygmentize -f 256 "$filename"
        ;;

        (.{,ba,z}sh*|.*profile)
            pygmentize -f 256 -l sh "$filename"
        ;;

        (*)
            if grep -E "#\!.*sh.*" "$filename" &> /dev/null
            then
                pygmentize -f 256 -l sh "$filename"
            else
                FILE="$(file -L "$filename")"
                FILE1="$(echo $FILE | cut -d ' ' -f 2)"
                FILE2="$(echo $FILE | cut -d ' ' -f 3)"
                if [ "$FILE1" = 'Linux/i386' \
                  -o "$FILE2" = 'Linux/i386' \
                  -o "$FILE1" = 'ELF' \
                  -o "$FILE2" = 'ELF' ]
                then
                    strings "$filename"
                fi
            fi
        ;;
    esac
}

preprocess "$1"