From b8b4c9b5b13158b0e0846297b080bd37c51ddd10 Mon Sep 17 00:00:00 2001
From: "Fred T. Hamster" <fred@gruntose.com>
Date: Sun, 6 Apr 2025 14:08:07 -0400
Subject: [PATCH] cleans directories with different hierarchies

this new tool compare_whacker is super handy.
i have a newer scheme for managing my digital pictures and an older scheme.
the two schemes are incompatible (old one used the camera name as the main index
and the new scheme just uses the data from the picture metadata).
the compare whacker was written so i could clean up a redundant copy of my pictures
that were stored in the old scheme.  i needed to find all the picture names that were
the same across the two.
NOTE: some pictures re-use the filenames on the pictures, and this creates havoc with
this script.  use more precise hierarchies if you have lots of identical file names!
---
 scripts/files/compare_whacker.sh | 109 +++++++++++++++++++++++++++++++
 1 file changed, 109 insertions(+)
 create mode 100644 scripts/files/compare_whacker.sh

diff --git a/scripts/files/compare_whacker.sh b/scripts/files/compare_whacker.sh
new file mode 100644
index 00000000..dcfe0595
--- /dev/null
+++ b/scripts/files/compare_whacker.sh
@@ -0,0 +1,109 @@
+#!/usr/bin/env bash
+
+# grab the arguments.
+SOURCE_DIR="$1"; shift
+WHACKING_DAY_DIR="$1"; shift
+
+function print_instructions()
+{
+  echo "
+$(basename $0): This script needs two directory names as arguments.
+The first argument should be a source directory where the 'good' files are
+located.  The files in this first source folder will not be touched.
+The second argument should be a target directory where some of the same files
+that are in the source directory can be found.  We don't want these target
+files if they're already in the source, so they will be deleted if the user
+okays this action.
+"
+}
+
+# validate the arguments.
+if [ -z "$SOURCE_DIR" -o ! -d "$SOURCE_DIR" ]; then
+  print_instructions
+  echo "the source directory (arg 1) was not provided or does not exist."
+  exit 1
+fi
+if [ -z "$WHACKING_DAY_DIR" -o ! -d "$WHACKING_DAY_DIR" ]; then
+  print_instructions
+  echo "the whacking target directory (arg2) was not provided or does not exist."
+  exit 1
+fi
+# verify that we are not smashing the same exact directory on itself.
+check_source="$(cd $SOURCE_DIR; pwd)"
+check_target="$(cd $WHACKING_DAY_DIR; pwd)"
+if [ "$check_source" == "$check_target" ]; then
+  print_instructions
+  echo "the two directories evaluate to the same location!  this would be bad."
+  exit 1
+fi
+
+# make a temporary file for our filename processing.
+TMPFILE="$(mktemp /tmp/compwhacker.XXXXXX)"
+
+# find the list of things we want to whack.
+declare -A potential_whackees
+find "$WHACKING_DAY_DIR" -follow -type f  > "$TMPFILE"
+while read filename; do
+  basepiece="${filename##*/}"
+  potential_whackees[$basepiece]="$filename"
+done < "$TMPFILE"
+
+# find all the source images that we have in imaginations.
+declare -A source_files
+find "$SOURCE_DIR" -follow -type f  > "$TMPFILE"
+while read filename; do
+  basepiece="${filename##*/}"
+  source_files[$basepiece]="$filename"
+done < "$TMPFILE"
+
+# clean up now that we're done with the temporary file.
+rm "$TMPFILE"
+
+# now iterate through all the whackable files and see if we have a match on the source side.
+declare -A legit_whackables
+for maybe_whack in "${!potential_whackees[@]}"; do
+  source_location="${source_files[$maybe_whack]}"
+#echo "found in source: $source_location"
+  if [ ! -z "$source_location" ]; then
+    legit_whackables[$maybe_whack]="${potential_whackees[$maybe_whack]}"
+#echo "added a legit whackable at: ${legit_whackables[$maybe_whack]}"
+  fi
+done
+
+if [ ${#legit_whackables[@]} -eq 0 ]; then
+  echo "
+There were no whackable files found for:
+  source='$SOURCE_DIR'
+  whacking target='$WHACKING_DAY_DIR'"
+  exit 0
+fi
+
+echo "
+We have found a set of files to clean up:
+"
+for iter in "${!legit_whackables[@]}"; do
+  echo "[$iter] => ${legit_whackables[$iter]}"
+done
+
+echo "
+Do you want to proceed on cleaning up the above list of files from
+the whackable location of '$WHACKING_DAY_DIR' (yes/no)?
+"
+read line
+
+# just get first character.
+firstchar="${line::1}"
+# make it lower case also.
+firstchar="${firstchar,,}"
+
+
+if [ "$firstchar" == "y" ]; then
+  echo Proceeding with cleanup...
+  for zapper in "${legit_whackables[@]}"; do
+    rm "$zapper"
+  done
+else
+  echo "Skipping the cleanup due to your answer of '$line'"
+fi
+
+
-- 
2.34.1