Windows "here document" as a FileCopy stats extractor

FileCopyStatsExtract.cmd

@set ERRORLEVEL=&setlocal&echo off
if not defined SED_EXE set SED_EXE=sed.exe
set ARG1=%~dpnx1
if defined ARG1 (
  if exist "%ARG1%" (
    call :sed_here "%~dpnx1"
    exit /b %ERRORLEVEL%
  )
)

echo .
echo usage: "%~nx0" FileCopy_log_to_parse
echo .
echo Here is a trivial example that is possible because "%~nx0" includes an example log
echo "%0" "%0"
echo . & cmd /c ^""%~dpnx0" "%~dpnx0"^"
exit /b -1

:sed_here
:: Run the sed script in the here document against this file
::   Note that it's necessary to escape selected double quotes,
::     semicolons, and commas; for clarity, I also escaped the
::     hat in the regular expressions for clarity
( for /f "delims=" %%C in ('^""%SED_EXE%" -n -e "1^,/^^SED_SCRIPT start$/d^; /^^SED_SCRIPT stop$/^,$ d^; p" "%~dpnx0"^"') do @echo %%C ) | "%SED_EXE%" -f - %1
REM echo exit code %ERRORLEVEL% 1>&2
exit /b %ERRORLEVEL%

Below is the sed script that will be applied to %~dpnx1, i.e., argument one of this script (%0)

SED_SCRIPT start
# *replace* the hold space with two lines extracted from the pattern space
/^FastCopy/  {s/FastCopy(ver\(.*\)) start at \(.*\)/FastCopyVersion = \1\nStartTime = \2/;      h}
# *append* lines matching these patterns to the hold space
/^TotalRead/H
/^TotalWrite/H
/^TotalFiles/H
/^TotalTime/H
/^TransRate/H
/^FileRate/H
/^VerifyRead/H
/^VerifyFiles/H
/^TotalSkip/H
/^SkipFiles/H
# clean up lines matching these patterns and *append* to the hold space
/^<Source>  /{s/^.\(Source\).  /Origin = /; y/"/'/; H}
/^<DestDir> /{s/^.\(DestDir\). /Target = /; y/"/'/; H}
/^<Exclude> /{s/^.\(Exclude\). /\1 = /;     y/"/'/; H}
/^<Command> /{s/^.\(Command\). /\1 = /;     y/"/'/; H}
/^<FileLog> /{s/^.\(FileLog\). /\1 = /;     y/"/'/; H}
# *append* two lines extracted from the pattern space to the hold space, 
#    then exchange with the pattern space and print
/^Result/    {s/Result : (ErrFiles : \(.*\) [/] ErrDirs : \(.*\))/ErrFiles = \1\nErrDirs = \2/; H; x; p}
d
SED_SCRIPT stop
Lines below (and including) this line are not processed by this script.

sed commands used in this sed script:
s - substitute                              https://tinyurl.com/rljdcx2#uh-1
h - copy pattern space to hold buffer       https://tinyurl.com/rljdcx2#uh-55
H - append pattern space to hold buffer     https://tinyurl.com/rljdcx2#uh-55
x - exchange pattern space with hold buffer https://tinyurl.com/rljdcx2#uh-53
p - print the pattern space                 https://tinyurl.com/rljdcx2#uh-31
d - delete pattern space and read next line https://tinyurl.com/rljdcx2#uh-30
/.../ - address pattern, not a true command https://tinyurl.com/rljdcx2#uh-27

Below is an example of a log to parse:

=================================================
FastCopy(ver3.32) start at 2020/03/07 23:32:53

<Source>  C:\Users\art\src\copyDirToZip\test\small
<DestDir> C:\Users\art\src\copyDirToZip\test\stg\g_demo\PI-small-2020
<Exclude> .ds_store;desktop.ini;thumbs.db;ehthumbs.db;.spotlight-v100;.documentrevisions-v100;.fseventsd;.mobilebackups;icon;__macosx
<Command> Diff (Size/Date) (with Verify)
<FileLog> C:\Users\art\AppData\Local\log4cmd\PI-small-2020_step\fastcopyDetails_2020-03-08T05-32-50Z_9AB55498.log
-------------------------------------------------
 No Errors

TotalRead  = 0.1 MB
TotalWrite = 0.1 MB
TotalFiles = 76 (0)
TotalTime  = 0.3 sec
TransRate  = 0.44 MB/s
FileRate   = 286.8 files/s
VerifyRead = 0.1 MB
VerifyFiles= 76

Result : (ErrFiles : 0 / ErrDirs : 0)