find_and_shorten.sh

#!/usr/bin/env bash
# shellcheck shell=bash
# ----------------------------------------------------------------
# Name: find_and_shorten (Recursive Byte-level Truncate)
# Version: 1.3.1
# (C) miaLDN 2026
# ----------------------------------------------------------------

source "${HOME}/.local/bin/ansi_colors.sh"

MAX_TOTAL_BYTES=143   # eCryptFS max bytes in filename
COMMIT=false
TARGET_DIR="."

while [[ $# -gt 0 ]]; do
    case $1 in
        -y|-yes|--yes) COMMIT=true; shift ;;
        *) TARGET_DIR="$1"; shift ;;
    esac
done

# Depth-first is the 'Bottom-Up' standard
find "$TARGET_DIR" -depth -print0 \
| while IFS= read -r -d '' path; do

    [[ "$path" == "$TARGET_DIR" ]] && continue

    clean_path="${path#./}"
    dir=$(dirname "$clean_path")
    base=$(basename "$clean_path")

    # Only files get extension preservation
    if [[ -f "$path" && "$base" == *.* ]]; then
        ext=".${base##*.}"
        name="${base%.*}"
    else
        ext=""
        name="$base"
    fi

    ext_bytes=$(echo -n "$ext" | wc -c)
    max_name_bytes=$(( MAX_TOTAL_BYTES - ext_bytes ))

    # Byte-level slice for eCryptfs compatibility
    short_name=$(echo -ne "$name\0" | cut -z -b 1-"$max_name_bytes" | xargs -0)
    new_base="${short_name}${ext}"
    final_bytes=$(echo -n "$new_base" | wc -c)

    if [[ "$base" != "$new_base" ]]; then
        if [ "$COMMIT" = true ]; then
            if mv --no-clobber "$path" "${dir}/${new_base}"; then
                echo -e "${BLUE_B}RENAMED:${ANSI_DEFAULT} ${YELLOW1_TEXT}'$base'${ANSI_DEFAULT} (${BOLD_RED}${final_bytes}b${ANSI_DEFAULT})"
            else
                echo -e "${BOLD_RED}COLLISION:${ANSI_DEFAULT} Skipped '$base'"
            fi
        else
            # Ligature-ready >> and High-Viz BOLD_RED
            echo -e "${ORANGE_B}DRY RUN:${ANSI_DEFAULT} ${YELLOW1_TEXT}'$base'${ANSI_DEFAULT} ${BLUE_TEXT}>>${ANSI_DEFAULT} ${GREEN1_TEXT}'$new_base'${ANSI_DEFAULT} (${BOLD_RED}${final_bytes}b${ANSI_DEFAULT})"
        fi
    fi
done