[gh-11363] Add pipe symbol escaping for Windows batch file

Windows command processor interprets pipe symbols as command separators,
causing JVM arguments with pipes to fail. This commit adds:

1. A call to escapePipes subroutine in the JVM config processing
2. An escapePipes subroutine that escapes unquoted pipe symbols with ^^^|
3. Quote-aware processing to only escape pipes outside of quotes

This ensures that JVM config files work correctly on Windows, macOS, and
Linux with proper pipe symbol handling across all platforms.

Author: gnodet

apache-maven/src/assembly/maven/bin/mvn.cmd

@@ -199,6 +199,9 @@ for /F "usebackq tokens=* delims=" %%a in ("%MAVEN_PROJECTBASEDIR%\.mvn\jvm.conf
         set "trimmed=!trimmed:${MAVEN_PROJECTBASEDIR}=%MAVEN_PROJECTBASEDIR%!"
         set "trimmed=!trimmed:$MAVEN_PROJECTBASEDIR=%MAVEN_PROJECTBASEDIR%!"
 
+        rem Escape pipe symbols that are not within quotes to prevent command separation
+        call :escapePipes "!trimmed!" trimmed
+
         if not "!trimmed!"=="" (
             if "!JVM_CONFIG_MAVEN_OPTS!"=="" (
                 set "JVM_CONFIG_MAVEN_OPTS=!trimmed!"
@@ -287,3 +290,39 @@ if exist "%USERPROFILE%\mavenrc_post.cmd" call "%USERPROFILE%\mavenrc_post.cmd"
 if "%MAVEN_BATCH_PAUSE%"=="on" pause
 
 exit /b %ERROR_CODE%
+
+rem Subroutine to escape pipe symbols that are not within quotes
+:escapePipes
+setlocal EnableDelayedExpansion
+set "input=%~1"
+set "output="
+set "inQuotes=0"
+set "i=0"
+
+:escapeLoop
+set "char=!input:~%i%,1!"
+if "!char!"=="" goto escapeEnd
+
+if "!char!"=="^"" (
+    if "!inQuotes!"=="0" (
+        set "inQuotes=1"
+    ) else (
+        set "inQuotes=0"
+    )
+    set "output=!output!!char!"
+) else if "!char!"=="|" (
+    if "!inQuotes!"=="0" (
+        set "output=!output!^^^|"
+    ) else (
+        set "output=!output!!char!"
+    )
+) else (
+    set "output=!output!!char!"
+)
+
+set /a "i+=1"
+goto escapeLoop
+
+:escapeEnd
+endlocal & set "%~2=%output%"
+goto :eof