Add environment wrapper script

[jcfr]

Updating the environment on Linux and macOS is similar to Windows (expect the variables to set are LD_LIBRARY_PATH and DYLD_LIBRARY_PATH).

Considering the idea is to support the development workflow, we should avoid updating the registry as this could introduce some hard to track issues.

There are few approaches to address this:

1. Generate .bat. and.sh` scripts acting as proxy that would be used like this:

   autoscoper_set_env.sh /path/to/autoscoper
   autoscoper_set_env.bat /path/to/autoscoper.exe

2. Integrate commontk/AppLauncher like it is done in Slicer

3. Integrate the forward launcher (see kwsys/SharedForward)

For now, I suggest to move forward with approach (1)

Steps

• Manually craft such script for windows (as this is your platform of development). Content would be similar to the following:

  @echo off
  setlocal enabledelayedexpansion
  
  set argCount=0
  for %%x in (%*) do (
  set /A argCount+=1
  set "argVec[!argCount!]=%%~x"
  )
  
  @set Path=C:\path\to\Qt\5.15.2\msvc2019_64\bin;%Path%
  
  echo [%*]
  
  if %argCount% gtr 0 (
  echo "Starting %1"
  %*
  ) else (
  echo Usage: %0 \path\to\executable [argument1 [...]] 1>&2
  )

• Once you have the script working, add CMake/autoscoper_set_env.bat.in and replace the text @set Path=C:\path\to\Qt\5.15.2\msvc2019_64\bin;%Path% with @PATHS_CONFIG@ and add the call

  set(PATHS_CONFIG "@set Path=${_qt5Core_install_prefix};%Path%")
  configure_file(
  CMake/autoscoper_set_env.bat.in
  ${Autoscoper_BINARY_DIR}/${Autoscoper_BIN_DIR}/autoscoper_set_env.bat
  @ONLY
  )

[jcfr]

For future reference, the setting of argCount in the windows bash script was adapted from https://superuser.com/questions/901932/how-do-i-detect-the-number-of-parameters-to-a-batch-file-and-loop-through-them