GIMP2.8で指定したフォルダ内の画像を一括サムネイル化するやつ作った(Python-Fu)

#!/usr/bin/env python
#coding: UTF-8

from gimpfu import *
import math, os, glob

def plugin_main(resImg, resDrawablepath, path, mW, mH, str_before, str_after, isWin):
	
	if not os.path.exists(path):
		gimp.message("指定されたフォルダ( " + path + " )は存在しません。")
		return
	
	if mW == 0 and mH == 0:
		gimp.message("サムネイルサイズ縦横が両方とも0(auto)になっています。いずれかひとつのサイズを指定してください。")
		return
	
	strSeparator = "\/"
	if isWin == TRUE:
		strSeparator = "\\"
	
	orgMW = mW
	orgMH = mH
	
	fnames = []
	types = ["*.gif", "*.jpeg", "*.jpg", "*.png"]
	
	for exts in types:
		fnames.extend(glob.glob(path + strSeparator + exts))
	
	for fname in fnames:
		img = pdb.gimp_file_load(fname, '')
		
		orgWidth = img.width
		orgHeight = img.height
		aspectRatio = 1.0 * orgWidth / orgHeight
		
		if orgWidth <= orgMW or orgHeight <= orgMH:
			continue
		
		if orgMW == 0:
			mW = round(1.0 * orgMH * aspectRatio)
			mH = orgMH
		
		if orgMH == 0:
			mW = orgMW
			mH = round(1.0 * orgMW / aspectRatio)
		
		if str_before == "" and str_after == "":
			str_before = "thumb_"
		
		fileName, ext = os.path.splitext(os.path.basename(fname))
		fileName = str_before + fileName + str_after
		newPath = path + strSeparator + fileName + ext
		
		pdb.gimp_image_scale_full(img, mW, mH, 3)
		
		if ext == ".gif":
			pdb.file_gif_save(img, img.layers[0], newPath, newPath, 0, 0, 0, 0)
		if ext == ".jpg" or ext == ".jpeg":
			pdb.file_jpeg_save(img, img.layers[0], newPath, fileName + ext, 1.0, 1.0, 0, 0, "", 0, 0, 0, 0)
		if ext == ".png":
			pdb.file_png_save(img, img.layers[0], newPath, fileName + ext, 0, 9, 0, 0, 0, 0, 0)
	
register(
	"python_fu_create_thumbnail_as_folder",
	"指定されたサイズで指定フォルダ内の全画像(gif, jpg, jpeg, png)のサムネイルを作成します",
	"指定されたサイズで指定フォルダ内の全画像(gif, jpg, jpeg, png)のサムネイルを作成します",
	"Yajirushi Yajirushi",
	"Yajirushi Yajirushi",
	"2016/9/12",
	"<Image>/File/フォルダ内のサムネイルを生成...",
	"*",
	[
	   (PF_DIRNAME, "targetPath", "対象のフォルダ", "."),
	   (PF_INT, "maxWidth", "横幅[px]<<0 = auto>>", 0),
	   (PF_INT, "maxHeight", "高さ[px]<<0 = auto>>", 300),
	   (PF_STRING, "namePref", "ファイル名接頭辞", 'thumb_'),
	   (PF_STRING, "namePref", "ファイル名接尾辞", ''),
	   (PF_BOOL, "isWINDOWS", "Windows環境？", TRUE)
	],
	[],
	plugin_main)
	
main()