dir2cbz

#!/usr/bin/env bash

# Converts every given directory to a CBZ-file.
# Can read a directory list from stdin or parameters.
# The script will never delete the original directories.
# 
# EXAMPLE:
#
# If a directory structure is the following:
#
# Volume 01
# |- Page 01.jpg
# |- Page 02.jpg
# '- Page 03.jpg
# Volume 02
# |- Page 01.jpg
# |- Page 02.jpg
# '- Page 03.jpg
#
# ... and the following arguments are given:
#
# $ dir2cbz "/path/to/Volume 01" "/path/to/Volume 02"
#
# ... dir2cbz will convert directories Volume 01 and Volume 02
# into CBZ files "Volume 01.cbz" and "Volume 02.cbz".

# Resulting archive format, defaulting to zip. If rar or 7z are used, remember
# to update DEST_TYPE to match by setting it to cbr or cb7
ARCHIVE_TYPE=zip

# Resulting comic book archive format, must match with ARCHIVE_TYPE, eg.
# ARCHIVE_TYPE=rar -> DEST_TYPE=cbr.
DEST_TYPE=cbz

# 7z options used when archiving the directory, do not change '-t'. '-mx' can
# be changed to change compression ratio (0=no compression, 9=max compression).
OPTS=(-t$ARCHIVE_TYPE -mx=0)

convert_to_archive () {
    dir="$(readlink -f "$1")"

    # Check if the given argument is a directory
    if [[ ! -d "$dir" ]]; then continue; fi

    # If the destination file already exists, in part or cbz format,
    # do not overwrite either and skip archival.
    if [[ -f "$dir.$DEST_TYPE" ]]; then
        echo "WARNING: file '$dir.$DEST_TYPE' already exists, skipping."
        return
    fi
    if [[ -f "$dir.part" ]]; then
        echo "WARNING: file '$dir.part' already exists, skipping."
        return
    fi

    # Go inside directory tree so that the resulting archive has proper
    # root directory, archive working directory files with '.' and move
    # part-file to the destination type (cbz) if 7z succeeds.
    cd "$dir" \
        && 7z a "${OPTS[@]}" "$dir.part" . > /dev/null 2>&1 \
        && mv "$dir.part" "$dir.$DEST_TYPE"
    cd - > /dev/null
}

# If parameters are given to the script, cycle through them.
# Otherwise read stin.
if [[ ! -z "$1" ]]; then
    for dir in "$@"; do
        convert_to_archive "$dir"
    done
else
    while read dir; do
        convert_to_archive "$dir"
    done
fi