批處理實現文本內容居中顯示的代碼
2020-06-09 13:48:55
供稿：網友
a.txt
代碼:
[Promise don't come easy]
I should have known all along.
There was something wrong.
I just never read between the lines.
Then I woke up one day and found you on your way.
Leaving nothing but my heart behind.
What can I do to make it up to you.
Promises don't come easy.
But tell me if there's a way to bring you back home to stay.
Well I'd promises anything to you.
I've been walkin' around with my head hanging down.
Wondrin' what I'm gonna do.
'Cause when you walked out that door.
要求，CMD原始窗口中，不調節窗口大小，不生成臨時文件，居中顯示文本內容。輸出如下：
代碼:
[Promise don't come easy]
I should have known all along.
There was something wrong.
I just never read between the lines.
Then I woke up one day and found you on your way.
Leaving nothing but my heart behind.
What can I do to make it up to you.
Promises don't come easy.
But tell me if there's a way to bring you back home to stay.
Well I'd promises anything to you.
I've been walkin' around with my head hanging down.
Wondrin' what I'm gonna do.
'Cause when you walked out that door.
Batcher：
sed -e :a -e "s/^./{1,77/}$/ & /;ta" a.txt
sed.exe
http://xiazai.jb51.net/201010/tools/sed_jb51.rar
batman：思路說明：
以下代碼是充分findstr命令的示例，使用findstr /n來取得行號同時兼容空行，
并將行號進行變量賦值；使用findstr /o來取得第行的字符偏移量，但要通過
上、下行的字符偏移差，因為字符偏移值是類計遞加的，同時每行回車增加
兩個字符偏移，所以不可避免要對最后一行強加回車，在不破壞原文件的情
況下只好生成臨時文件；利用findstr /o能夠一次性獲得文本所有行的字符偏
移量也就是字符總數，效率和逐字符判斷相比肯定是高得多了。
－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－
代碼如下:
@echo off
copy /y 1.txt 2.txt>nul
echo.>>2.txt&echo end>>2.txt
for /f "tokens=1,2* delims=: " %%i in ('findstr /n /o .* 2.txt') do (
set "_%%i=%%j"&set ".%%i=%%k"
if %%i geq 2 call :lp %%i
)
del /q 2.txt&pause>nul&goto :eof
:lp
set /a n=%1-1
set /a num=_%1-_%n%-2
set /a kl=(80-num)/2
for /l %%i in (1,1,%kl%) do set /p= <NUL
call,set /p=%%.%n%%%<NUL&ECHO.
