Batch combine new elements into subtitle files - windows

Question

I want to take a folder with several (15 in this first case) 'subtitle.srt' files (which, as I'm sure you're aware, are just text files with the extension ".srt" instead of ".txt") and modify each file in turn so that a new subtitle is added at the start of each file.
I want the new subtitle to be:-
0
00:00:00,001 --> 00:00:02,100
"Filename"
So, for example, if the first subtitle file in the folder is called "01. What Lies Beneath.srt" and it looks like this:-
1
00:00:02,120 --> 00:00:03,560
<font color="#FFFF00">Previously on Superman & Lois...</font>
2
00:00:03,560 --> 00:00:06,880
<font color="#00FFFF">I'm stepping down from active duty.</font>
<font color="#00FF00">You're going to be hard to replace.</font>
3
Etc., etc...
then after processing, I want it to look like this:-
0
00:00:00,001 --> 00:00:02,100
01. What Lies Beneath
1
00:00:02,120 --> 00:00:03,560
<font color="#FFFF00">Previously on Superman & Lois...</font>
2
00:00:03,560 --> 00:00:06,880
<font color="#00FFFF">I'm stepping down from active duty.</font>
<font color="#00FF00">You're going to be hard to replace.</font>
3
Etc., etc...
I'm rubbish at batch coding so I tried searching out possible ways to do it but nothing I tried worked!
Below are some attempts I made using different "routines" I found; each successive attempt separated (from last to first) by the PAUSE, EXIT commands:-
for %%a in (*.txt) do type append_ns0 >> %%a.srt
pause
exit
for %%a in (*.txt) do type append_ns0 >> %%a
for %%a in (*.txt) do type "%%~na" >> %%a
for %%a in (*.txt) do type append_spc >> %%a.srt
pause
exit
for %%I in (*.txt) do copy "C:\Users\wbcam\Desktop\G classroom\AddTitle.txt"+"%%~nI"+" "+"%%I" "%%~nI.srt"
pause
exit
for %X in (C:\Users\wbcam\Desktop\G classroom\Add Titles\*.txt) do type C:\Users\wbcam\Desktop\G classroom\AddTitles.txt >> %X
pause
exit
To use the COPY command I had to first rename the files from .srt to .txt (I'd rather NOT have to do that; I'm hoping someone can show me how to work on the ,srt files without any intermediate stages) and COPY also seemed to add a hex1A character to the end of the new file but, of course, it couldn't handle the insertion of the Filename (a text string) into the new file as it would only concatenate files not strings (if I, eventually, understood it's operation correctly, Doh!).
And attempts to use the ECHO or TYPE commands just seemed to overwrite everything in the original file leaving only:-
0
00:00:00,001 --> 00:00:02,100
and bugger all else!
Can anyone help out, please?

Answer 1

#ECHO OFF
SETLOCAL
rem The following setting for the source directoryis a name
rem that I use for testing and deliberately includes spaces to make sure
rem that the process works using such names. These will need to be changed to suit your situation.
SET "sourcedir=u:\your files"
FOR /f "delims=" %%b IN (
'dir /b /a-d "%sourcedir%\*.srt" '
) DO (
(
ECHO 0
ECHO 00:00:00,001 --^> 00:00:02,100
ECHO "%%~nb"
ECHO.
TYPE "%sourcedir%\%%b"
)>"%sourcedir%\%%~nb.txt"
MOVE "%sourcedir%\%%~nb.txt" "%sourcedir%\%%b" >NUL
)
GOTO :EOF
Always verify against a test directory before applying to real data.
Perform a directory scan. assigning each filename that matches the mask to %%b.
Write the two required lines, a line containing the name part of the filename in quotes and an empty line to the output, then type the contents of the selected file. Note that the > character in the text needs to be escaped by a caret. The output of the echoes is gathered and redirected to a .txt file and the .txt file is then written over the original file. The 1 file(s) copied message is suppressed by the >nul.
If you prefer, you could replace the two echo lines that insert the fixed text with type somefilename where somefilename contains the fixed text required.
You could replace the move line for testing with
FC "%sourcedir%\%%~nb.txt" "%sourcedir%\%%b"
which will show the differences.
copy adds the control-z following an archaic convention that ^Z marked end-of-file for text files.
--- Addition in response to comment
for /? from the prompt generates documentation about the for command - in general, commandname /? generates documentation for any command, although some commands require -? or -h or --h or --help. Utility designers generally follow the same convention and the details depend on the platform for which the software was originally designed.
for /f ... ('command....') do ... interprets the command-output as though it was a file.
The dir command reports the filenames and subdirectorynames in a directory. By default, it produces a formatted report including filesize and last-update date, but has numerous options including /b to produces a "basic" report (names only, no sizes, headers, summary, dates ,etc.) and /a-d which suppresses directorynames. The /s option means 'and list subdirectories too'. It can also accept a filemask (or ambiguous filename) - which applies equally to directorynames. If the filename supplied contains a ? then this means any ONE character or * which means any number of any characters - any other characters are taken literally and will match regardless of case. Hence, *.srt means any number of any characters followed by .srtwhich should select all file/directorynames that end.srt. The filemask may be preceded by *directoryname\\* which means scan this directory- but *that* directoryname may **not** contain?or*`.
When for /f is supplied with a filename list in basic form, each filename in the list is assigned to the metavariable assigned (%%a in this example) in turn and the do statements are executed using the assigned value in the metavariable. Again, there are many ways of having for /f interpret the value-string that is assigned to the metavariable. Many, many examples of these on SO
In the days of CP/M, filesize was a number of 128-byte blocks. Since files were not often a multiple of 128 bytes long, convention was that a control-z marked the end-of-file. Backwards-compatibility is a big issue in computing as it's wasteful to revise existing systems to cater for a concept-revision. Hence, the control-Z convention is still recognised and observed for text files.