Show the diff of the current file and the recovered file

vim-recovery-diff

#!/bin/sh

file="$1"
# Check if file exists
if [ ! -f "$file" ]; then
    echo "Error: File '$file' not found" >&2
    exit 1
fi

# Change to directory containing the file
cd "$(dirname "$file")" || exit 1
file=$(basename "$file")

# Get applicable swap files, storing only the filenames
applicable_swaps=$(vim -r 2>&1 | grep "^[0-9].*${file}" | grep -o -E '[^ ]+$' || true)

# If no swap files found
if [ -z "$applicable_swaps" ]; then
    echo "No swap files found for '$file'" >&2
    exit 1
fi

# Count number of applicable swap files
swap_count=$(echo "$applicable_swaps" | wc -l)

# If only one swap file, select it automatically
if [ "$swap_count" -eq 1 ]; then
    swapfile=$applicable_swaps
else
    while true; do
        echo "$applicable_swaps" | cat -n
        echo "Enter the number of the swap file to recover or q to quit: "
        read -r choice

        if [ "$choice" = "q" ]; then
            exit 0
        fi

        # Validate numeric input and range
        if ! echo "$choice" | grep -q '^[0-9]\+$'; then
            echo "Error: Invalid input. Please enter a number or q to quit." >&2
            continue
        fi

        if [ "$choice" -lt 1 ] || [ "$choice" -gt "$swap_count" ]; then
            echo "Error: Please enter a number between 1 and $swap_count" >&2
            continue
        fi

        swapfile=$(echo "$applicable_swaps" | awk "NR==$choice")
        break
    done
fi

if [ -n "$swapfile" ]; then
    recovered_file=$(mktemp -t vim-recover.XXXXXXXXXX)
    
    # Recover the swap file content
    vim -n -r "$file" -c ":w! $recovered_file" -c ":q!"
    
    # Show diff
    diff "$file" "$recovered_file" | less
fi