Encode the file order in an archive to the metadata of the decompressed files

archive-order-to-date-modified

#!/bin/bash

# https://github.com/aonez/Keka/issues/932#issuecomment-989762514
# By Matt Sephton @gingerbeardman 2021-12-11
# - Created all versions til then
# By @porg 2021-12-15
# - Fixed base60 vs. base100 timestamp bug
# - Added more verbose script output

# Dependencies: p7zip, pipx, osxmetadata

# $ brew install p7zip
# $ brew install pipx
# $ pipx install osxmetadata
# Check your PATH and confirm operation

# Get base of filename
BASE=$(basename "$1" .zip)

# Get files in zip order, use 7z to respect character encodings
FILES=$(7z l -slt -ba "$1" | grep "Path" | sed 's/Path \= //g;')

# Prepare timestamps
DATESTAMP=$(date -r "$1")
UNIXSTAMP=$(date -jf "%a %b %d %T %Z %Y" "$DATESTAMP" +"%s")
TOUCHSTAMP=$(date -jf "%s" "$UNIXSTAMP" +"%Y%m%d%H%M.%S")
TOUCHSTAMP=$(date -jf "%s" "$UNIXSTAMP" +"%Y%m%d%H%M.%S")
YYYYMMDDhhmmss=$(date -jf "%s" "$UNIXSTAMP" +"%Y%-m%-d %H:%M:%S")

# Unzip and only show interesting lines of output
7z x "$1" -aoa -o"$BASE" | grep "[th]ing"

# Set counters
COUNTER=1

# Info on archive

echo "Files in archive:   $(echo "$FILES" | wc -l | tr -d "[:blank:]" )"
echo "Date Stamp:         $DATESTAMP"
echo "Touch Stamp:        $TOUCHSTAMP"
echo "Unix Stamp:         $UNIXSTAMP"
echo


## Loop through file list

echo "File order in archive will be baked into metadata of extracted files:"
echo "- Finder comment gets sequence number"
echo "- Modification date will be created artificially"
echo "  - First file in archive gets same mod-date as archive"
echo "  - Next file each will be one second younger than the previous file"
echo
echo "Extracting files..."
echo
echo -e "Nr\tUnix Date\tYYYY-MM-DD hh:mm:ss\tFile"
echo

echo "$FILES" | while read f
do
  # Show progress
  
  TOUCHSTAMP=$(date -jf "%s" "$UNIXSTAMP" +"%Y%m%d%H%M.%S")
  YYYYMMDDhhmmss=$(date -jf "%s" "$UNIXSTAMP" +"%Y-%m-%d %H:%M:%S")

  echo -e "$COUNTER\t$UNIXSTAMP\t$YYYYMMDDhhmmss\t$f"
  
  # Encode archive order into metadata
  osxmetadata -s findercomment "$COUNTER" "$BASE/$f"	# Finder comment
  touch -t $TOUCHSTAMP "$BASE/$f"	# Date modified
  

  # Adapt counters
  COUNTER=$((COUNTER+1)) # No zero padding necessary. Finder sorts correctly.
  UNIXSTAMP=$((UNIXSTAMP-1)) # Decrement b/c Finder icon view sorting by date modified only descending
done