Diff two directories and output the differences

diff_directory.sh

#!/bin/bash

# Check for the correct number of arguments
if [ "$#" -ne 3 ]; then
    echo "Usage: $0 <directory1> <directory2> <output_directory>"
    exit 1
fi

# Assign arguments to variables
DIR1="$1"
DIR2="$2"
OUTPUT_DIR="$3"

# Create output directory if it doesn't exist
mkdir -p "$OUTPUT_DIR"

# Function to create a safe filename from a full path
function create_safe_filename {
    echo "$1" | sed "s|$DIR1/||; s|/|_|g; s|$DIR2/||"
}

# Function to handle unique directories
function handle_unique_directory {
    UNIQUE_DIR_PATH="$1"
    SAFE_DIR_NAME=$(create_safe_filename "$UNIQUE_DIR_PATH")

    # Iterate over each file in the unique directory
    find "$UNIQUE_DIR_PATH" -type f | while read -r file; do
        # Generate output file name for each file in the unique directory
        SAFE_FILE_NAME=$(create_safe_filename "$file")
        OUTPUT_FILE="$OUTPUT_DIR/$SAFE_DIR_NAME.$SAFE_FILE_NAME.unique.diff"

        # Create a diff file for the unique file
        echo "Unique file in $UNIQUE_DIR_PATH: $file" > "$OUTPUT_FILE"
        cat "$file" >> "$OUTPUT_FILE"
    done
}

# Compare directories and get differing files and directories, excluding .git
diff -qr --exclude=".git" "$DIR1" "$DIR2" | while read -r line; do
    if [[ "$line" == "Only in"* ]]; then
        # Handle unique files and directories
        # Extract the directory path and file/directory name
        UNIQUE_PATH=$(echo "$line" | cut -d' ' -f3-)
        UNIQUE_DIR=$(echo "$UNIQUE_PATH" | cut -d':' -f1)
        UNIQUE_ITEM=$(echo "$UNIQUE_PATH" | cut -d':' -f2 | xargs)

        # Check if it's a directory or file
        if [ -d "$UNIQUE_DIR/$UNIQUE_ITEM" ]; then
            # Handle unique directory
            handle_unique_directory "$UNIQUE_DIR/$UNIQUE_ITEM"
        elif [ -f "$UNIQUE_DIR/$UNIQUE_ITEM" ]; then
            # Handle unique file
            FULL_PATH="$UNIQUE_DIR/$UNIQUE_ITEM"
            SAFE_OUTPUT_FILE=$(create_safe_filename "$FULL_PATH")
            OUTPUT_PATH="$OUTPUT_DIR/$SAFE_OUTPUT_FILE.unique.file.diff"

            # Copy the content of the unique file into the diff file
            echo "Unique file: $FULL_PATH" > "$OUTPUT_PATH"
            cat "$FULL_PATH" >> "$OUTPUT_PATH"
        fi
    elif [[ "$line" == "Files"* ]]; then
        # Extract file paths
        FILE1=$(echo "$line" | cut -d' ' -f2)
        FILE2=$(echo "$line" | cut -d' ' -f4)

        # Generate output file name based on FILE1's full path
        SAFE_OUTPUT_FILE=$(create_safe_filename "$FILE1")
        OUTPUT_PATH="$OUTPUT_DIR/$SAFE_OUTPUT_FILE.diff"

        # Generate diff file
        diff "$FILE1" "$FILE2" > "$OUTPUT_PATH"
    fi
done