#!/usr/bin/env bash
# -*-coding:utf-8 -*-
# Auto updated?
#   Yes
#File :
#   bulkrename
#Author:
#   The-Repo-Club [wayne6324@gmail.com]
#Github:
#   https://github.com/The-Repo-Club/
#
# Created:
#   Sun 31 October 2021, 05:16:39 PM [GMT]
# Modified:
#   Fri 21 January 2022, 02:29:56 PM [GMT]
#
# Description:
#   Run this script by setting it at: # Nemo -> Edit -> Preferences ->
#   Behavior -> Bulk Rename # Select multiple files in Nemo and hit F2 (or
#   right-click -> Rename)
#

# Return the index of the first ocurrence of a substring or -1 if none
# $1 = string
# $2 = substring
function strindex() {
  x="${1%%$2*}"
  [[ "$x" = "$1" ]] && echo -1 || echo "${#x}"
}

# Convert '+' to ' ' and '%20' to ' '
# $1 = string to decode
function urldecode() {
    : "${*//+/ }"; echo -e "${_//%/\\x}";
}

# Log to temporary file if enabled
function log() {
    echo $1 >> "/tmp/nemo-bulk-rename.log"
}

# Add index to string replacing placeholder if exists or at the end.
# $1 = string
# $2 = leadingCeroes
# $3 = index
function replaceCounter() {
    if [[ "$counterIndex" -eq "-1" ]];
    then
        echo "$1_$3";
    else
        printf -v index "%0$2d" $3
        echo ${1/"z:$2"/$index}
    fi
}

log "============ New bulk rename at `date '+%Y-%m-%d %H:%M:%S'` ============"

fileName=$(yad --entry --title="Nemo - Bulk Rename" \
    --window-icon="info" \
    --text="Type new file name without extension ('/' is not allowed).\n\
    Use z:# placeholder mask to specify counter position and amount of leading zeroes.\
    \ni.e.:\n  'filename' = filename_1.ext (no mask)\n  'myz:2file' = my01file.ext (mask)")

if [[ -z "$fileName" ]]; then
    exit 0
elif [[ $fileName == *\/* ]]; then
    notify-send "Bulk Rename: Error" "Please insert a valid file name." -i error -u low
    exit 1
fi

log "renaming files to: $fileName"
placeholder="z:"
counter=1
counterIndex=$(strindex "$fileName" "$placeholder")
leadingCeroes=${fileName:$counterIndex+2:1}

log "found placeholder at: $counterIndex for $leadingCeroes leading ceroes"
# loop throught files passed by Nemo
# paths come in the format "file:///home/user/.."
for i; do
    i=$(urldecode $i)
    # replace "file://" with ""
    oldPath=${i/"file://"/""}
    path="${oldPath%\/*}"
    ext=${oldPath##*.}
    newName="$path/$(replaceCounter "$fileName" "$leadingCeroes" "$counter").$ext"
    log "renaming $oldPath to $newName"
    mv "$oldPath" "$newName"
    counter=$((counter+1))
done
counter=$((counter-1))
notify-send "Bulk Rename: Completed" "Renamed $counter files successfully" -i nemo -u low
exit 1