Launch emacs in the Linux subsystem for Windows

launch_emacs.bat

REM Launch emacs in the Linux subsystem for Windows for a quoted filename.
REM Daniel Rothfus
REM Sept 3, 2017
REM
REM To add Linux emacs as a right-click item in the context menu, add a registry
REM key at Computer\HKEY_CLASSES_ROOT\*\shell\emacs\command with the default
REM value "C:\...\launch_emacs.bat" "%1". Set the parent key's default value to
REM the entry's desired name, such as "Launch in Emacs".
REM
REM This script is an MVP and as such it probably has many edge cases around
REM characters allowed in Windows paths that are interpreted differently in a
REM bash shell.

@echo off

set arg1=%1
set "path=%arg1:~1,-1%"
set "crel=%path:C:=%"
set "r1=%crel:\=/%"
set "r2=%r1: =\ %"

"C:\Windows\System32\bash" -c "emacs /mnt/c%r2%"