Artistic Style をクリップボードに使いたいようなそんな感じ。 mshta と JScript を利用。

astyle_clipboard.bat

@rem -*- coding: shift_jis-dos -*-
@echo off

set ASTYLE="AStyle.exe" --mode=c -n --style=kr

for /f "usebackq" %%s in (`mshta "javascript:var text = clipboardData.getData('text');var fso;var tmpfilename;var tmpfile;if (text) {fso = new ActiveXObject('Scripting.FileSystemObject');tmpfilename = fso.GetTempName();tmpfile = fso.CreateTextFile(tmpfilename);tmpfile.Write(text);tmpfile.Close();fso.GetStandardStream(1).Write(tmpfilename);}close();"`) do set tmpfilename=%%s

rem var text = clipboardData.getData('text');
rem var fso;
rem var tmpfilename;
rem var tmpfile;
rem 
rem if (text) {
rem     fso = new ActiveXObject('Scripting.FileSystemObject');
rem     tmpfilename = fso.GetTempName();
rem     tmpfile = fso.CreateTextFile(tmpfilename);
rem     tmpfile.Write(text);
rem     tmpfile.Close();
rem     fso.GetStandardStream(1).Write(tmpfilename);
rem }
rem 
rem close();

if "%tmpfilename%" == "" exit /b

%ASTYLE% "%tmpfilename%"

mshta "javascript:var fso = new ActiveXObject('Scripting.FileSystemObject');var tmpfilename = '%tmpfilename%';var tmpfile;var text;tmpfile = fso.OpenTextFile(tmpfilename, 1);text = tmpfile.ReadAll();tmpfile.Close();clipboardData.setData('text', text);close();"

rem var fso = new ActiveXObject('Scripting.FileSystemObject');
rem var tmpfilename = '%tmpfilename%';
rem var tmpfile;
rem var text;
rem 
rem tmpfile = fso.OpenTextFile(tmpfilename, 1);
rem text = tmpfile.ReadAll();
rem tmpfile.Close();
rem clipboardData.setData('text', text);
rem 
rem close();

del "%tmpfilename%"