clean-cache.sh

   1 #!/bin/bash
   2
   3 set -euo pipefail
   4
   5 if [[ -z ${XDG_CACHE_HOME:-} ]]; then
   6     cache_dir=$HOME/.cache
   7 else
   8     cache_dir=$XDG_CACHE_HOME
   9 fi
  10
  11 if [[ ! -e $cache_dir ]]; then
  12     echo "Can't find $cache_dir, exiting..."
  13     exit 1
  14 fi
  15
  16 if [[ -z ${CLEAN_CACHE_CONFIG:-} ]]; then
  17     rc_path="~/.config/moggers87/clean_cacherc"
  18 else
  19     rc_path=$CLEAN_CACHE_CONFIG
  20 fi
  21
  22 expanded_path=${rc_path/#\~/$HOME}
  23
  24 if [ -e $expanded_path ]; then
  25     . $expanded_path
  26 fi
  27
  28 if [[ -z ${days:-} ]]; then
  29     days=360
  30 fi
  31
  32 progname=`basename $0`
  33
  34 sub_help() {
  35     echo "$progname [command]"
  36     echo ""
  37     echo "Commands:"
  38     echo ""
  39     echo "  clean"
  40     echo "    Cleans $cache_dir of files that haven't been accessed in the last $days days. Deletes empty directories. Expects environment variables set in $rc_path. Set days to control what is considered old." | fmt
  41     echo ""
  42     echo "  find"
  43     echo "    Same as clean, except it returns the list of files that would be removed rather than actually removing them" | fmt
  44     echo ""
  45     echo "  example"
  46     echo "    Add an example config file to $rc_path if that path does not already exist" | fmt
  47     echo ""
  48 }
  49
  50 sub_example() {
  51     if [ -e $expanded_path ]; then
  52         echo "$rc_path already exists, refusing to overwrite!"
  53         return 1
  54     fi
  55     mkdir -p `dirname $expanded_path`
  56     cat <<EOF > $expanded_path
  57 # how many days old should something be before it's removed from the cache?
  58 export days=365
  59 EOF
  60 }
  61
  62 sub_clean() {
  63     find $cache_dir -type f -atime +$days -delete
  64     find $cache_dir -type d -empty -delete
  65 }
  66
  67 sub_find() {
  68     find $cache_dir -type f -atime +$days
  69 }
  70
  71 subcommand=${1:-}
  72 case $subcommand in
  73     "" | "-h" | "--help")
  74         sub_help
  75         ;;
  76     *)
  77         shift
  78         if [ -n "$(type -t sub_${subcommand})" ]; then
  79             sub_${subcommand} $@
  80         else
  81             echo "Error: '$subcommand' is not a valid command" >&2
  82             exit 1
  83         fi
  84         ;;
  85 esac