[文本处理] [已解决]批处理如何对含有指定内容行的特定字段进行替换[附源码，求]

kingshui

昨晚写了个firefox启动器的批处理，对于prefs.js里的“download”那段本来是想用变量替换的方法来实现的，但是实在是想不出来好招。所以写了下面一堆来实现我要的效果。
求精简及指正
比如：路径的判读，这里没有实现。文本操作我总感觉我写的不够精简，求指正。谢谢

@echo off
setlocal enableextensions
cd /d %~dp0

:checkini
if exist myfirefox.ini goto downdir
echo [Settings]>myfirefox.ini
echo FirefoxPath=Firefox\firefox.exe>>myfirefox.ini
echo ProfileDir=profiles>>myfirefox.ini
echo CustomPluginsDir=plugin>>myfirefox.ini
echo CustomCacheDir=>>myfirefox.ini
echo CheckDefaultBrowser=1>>myfirefox.ini
echo params=/Prefetch:1 -turbo>>myfirefox.ini
echo DownDir=Downloads>>Myfirefox.ini

setlocal enabledelayedexpansion
for /f "delims=" %%i in ('findstr "=" Myfirefox.ini') do set %%i

:cleancache
if exist %ProfileDir%\cache ( rd /s/q %ProfileDir%\cache )
if exist %ProfileDir%\_CACHE_CLEAN_ ( del /f/q %ProfileDir%\_CACHE_CLEAN_ )
if exist cache rd /s/q cache
if exist _cache_clean_ del /f/q _cache_clean_

:downdir
if not exist %DownDir% md %DownDir%
set prefs=%~dp0%ProfileDir%\prefs.js
set downdir=%~dp0%DownDir%
set dirname=%downdir:\=\\%
set "ddir=user_pref("browser.download.folderList", 2);"
set "downdir=user_pref("browser.download.dir","%dirname%");"
find "browser.download.dir" %prefs%
set msg=%errorlevel%
if %msg% equ 1 (
	echo,>> %prefs%
	echo !downdir! >> %prefs%
	)
if %msg% equ 0 (
	findstr /v "browser.download.dir" %prefs%>str
	move /y str %prefs%
	echo,>> %prefs%
	echo !downdir! >> %prefs%
	)

find "user_pref("browser.download.folderList", 2);" %prefs%
set ddirerror=%errorlevel%
if %ddirerror% equ 1 (
	echo,>> %prefs%
	echo !ddir! >> %prefs%	
	)
if %ddirerror% equ 0 (
	findstr  /v "browser.download.folderList" %prefs%>dstr
	move /y dstr %prefs%
	echo,>> %prefs%
	echo !ddir! >> %prefs%	
	)

:run
start %FirefoxPath% -profile %ProfileDir% %params%
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Batcher

你想把prefs.js里面的什么内容替换成什么？

kingshui

回复 2# Batcher

不好意思，没表达清楚，
如

user_pref("browser.download.dir", "X:\\PortableAPPC\\MyFirefox\\Downloads");
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这里面的"X:\\PortableAPPC\\MyFirefox\\Downloads"这一节，因为要经常移动，所以这个目录会变，我想把他自动替换成当前目录下的Downloads目录

不知道可不可以把这一节的随机（算是随机吧，反正不固定）的内容截掉来替换成%~dp0Downloads呢？
可不可以 用for /f "tokens=3,4* delims=" 这个方法截取呢？不知道怎么用双引号作截断。
请指点，谢谢。

Batcher

回复 3# kingshui

@echo off
for /f tokens^=1-5^ delims^=^" %%a in (a.txt) do (
    echo %%a"%%b"%%c"%~dp0Downloads"%%e
)
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kingshui

回复 4# Batcher

非常感谢，不过prefs.js是多行内容

# Mozilla User Preferences

/* Do not edit this file.
 *
 * If you make changes to this file while the application is running,
 * the changes will be overwritten when the application exits.
 *
 * To make a manual change to preferences, you can visit the URL about:config
 */

user_pref("app.update.lastUpdateTime.addon-background-update-timer", 1363012569);
user_pref("app.update.lastUpdateTime.background-update-timer", 1363042459);
user_pref("app.update.lastUpdateTime.blocklist-background-update-timer", 1363012689);
user_pref("app.update.lastUpdateTime.browser-cleanup-thumbnails", 1363046299);
user_pref("app.update.lastUpdateTime.search-engine-update-timer", 1363035379);
user_pref("browser.cache.disk.capacity", 358400);
user_pref("browser.cache.disk.smart_size.first_run", false);
user_pref("browser.cache.disk.smart_size.use_old_max", false);
user_pref("browser.cache.disk.smart_size_cached_value", 358400);
user_pref("browser.download.dir", "X:\\PortableAPPC\\MyFirefox\\Downloads");
user_pref("browser.download.folderList", 2);
user_pref("browser.download.panel.firstSessionCompleted", true);
user_pref("browser.download.panel.shown", true);
user_pref("browser.migration.version", 9);
user_pref("browser.newtabpage.enabled", false);
user_pref("browser.newtabpage.storageVersion", 1);
user_pref("browser.pagethumbnails.storage_version", 3);
user_pref("browser.panorama.experienced_first_run", true);
user_pref("browser.panorama.session_restore_enabled_once", true);
user_pref("browser.places.smartBookmarksVersion", 4);
user_pref("browser.preferences.advanced.selectedTabIndex", 4);
user_pref("browser.rights.3.shown", true);
user_pref("browser.safebrowsing.enabled", false);
user_pref("browser.safebrowsing.malware.enabled", false);
user_pref("browser.search.selectedEngine", "Google AS - 中文网页");
user_pref("browser.sessionstore.restore_on_demand", false);
user_pref("browser.shell.checkDefaultBrowser", false);
user_pref("browser.startup.homepage", "chrome://ubufox/locale/ubufox.properties");
user_pref("browser.startup.homepage_override.buildID", "20130310030906");
user_pref("browser.startup.homepage_override.mstone", "22.0a1");
user_pref("browser.startup.page", 3);
user_pref("browser.syncPromoViewsLeftMap", "{\"passwords\":0}");
user_pref("browser.tabs.warnOnClose", false);
user_pref("capability.policy.maonoscript.javascript.enabled", "allAccess");
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是不是用以下这段会比较好点？

setlocal enabledelayedexpansion
if not exist %DownDir% md %DownDir%
set prefs=%~dp0%PFDir%\prefs.js
set downdir=%~dp0%DownDir%
set dirname=%downdir:\=\\%
set ddir=user_pref("browser.download.folderList", 2);
set downdir=user_pref("browser.download.dir","%dirname%");
set count=0
for /f "skip=2" delims=[] tokens=1" %%i in  ('find /n "browser.download.dir" %prefs%) do (
	set /a row=%%i-2
	for /f "delims=" %%j in (%prefs%) do (
		set /a count=!count!+1
		if !count! equ !row! (echo !downdir!>>str) else (echo %%j>>str)
	)
)
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要认真学习了。楼上的批完全理解了之后应该会明白很多，谢谢，非常感谢