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|
#!/bin/bash
set -e
FORMAIL=formail
SPLIT_MBOX_DIR=
#--------------------------------------------------
error () {
echo "**Error:**" "$@" >&2
exit 1
}
#--------------------------------------------------
while [ $# -ge 1 ]
do
case "$1" in
"--split-to" )
[[ $# -ge 2 ]] || error "--split-to requires a further parameter: the directory for the split mboxen"
SPLIT_MBOX_DIR="$2"
shift
;;
* )
[[ $# -le 1 ]] || error "Further paramaters follow the mbox parameter"
MBOX_FILE="$1"
;;
esac
shift
done
#--------------------------------------------------
[[ ! -z "$MBOX_FILE" ]] || error "No mbox file given"
[[ -e "$MBOX_FILE" ]] || error "The given mbox file \"${MBOX_FILE}\" does not exist"
[[ ! -d "$MBOX_FILE" ]] || error "The given file \"${MBOX_FILE}\" should be an mbox, but is a directory"
#--------------------------------------------------
if [ -z "$SPLIT_MBOX_DIR" ]
then
SPLIT_MBOX_DIR="$(echo "$MBOX_FILE" | sed -e 's@\(\(.*/\|^\)mbox\)/@\1_split/@')"
[[ "$MBOX_FILE" != "$SPLIT_MBOX_DIR" ]] || error "Determining directory for split mbox failed"
[[ ! -e "$SPLIT_MBOX_DIR" ]] || error "The directory for the split mboxen \"${SPLIT_MBOX_DIR}\" already exists"
fi
mkdir -p "$SPLIT_MBOX_DIR"
PART=0 # the suffix number for the split files
PREVIOUS_SEPARATION_POS=1 # the position of the newline before the mbox From
# separator for the previous message. We initialize it to the beginning of
# the file to get a good start (the first Message does not have a prepented
# newline).
LINE_OFFSET=2 # the parameter passed to tail to strip the correct number of lines.
# This is two for the first iteration, and three for the following iterations
# SEPARATION_POS is the byte offset rom the beginning of the file to a newline
# before a "From" mbox separator. We add the file size as final separation
# point to not omit the last message of the mbox.
for SEPARATION_POS in $( grep -b -B 1 '^From[[:space:]]' "$MBOX_FILE" | grep '^[0-9]*-$' | sed -e 's/-//' ) $(($(stat "-c%s" "$MBOX_FILE")-1))
do
# We first chop off the part after the message, then the part before the
# message and finally "tail" away the remains the the mbox format.
head -c $SEPARATION_POS "$MBOX_FILE" | \
tail -c $((SEPARATION_POS-PREVIOUS_SEPARATION_POS)) | \
tail -n +${LINE_OFFSET} >"${SPLIT_MBOX_DIR}"/part."$PART"
PART=$((PART+1))
PREVIOUS_SEPARATION_POS=$SEPARATION_POS
LINE_OFFSET=3
done
|
