On Friday 25 November 2005 09:37, jpff@codemist.co.uk wrote:

> Is not the best way to handle the need for an environment variable to
> create a shell wrapper?  I could adjust the installation program to
> create such a wrapped system; would need a name though!

I actually used this method and it works well for standalone
executables, and also makes the utilities much smaller. It still
requires the user to set up the environment in the case of using
Csound modules from external software like PD, Python, etc., though
(of course, if you are only interested in a Csound4-style package
with static command line executables only, this is not an issue).

For example, the wrapper script for the single precision "csound"
frontend is (installed as /usr/local/bin/csound):

  #!/bin/sh

  export OPCODEDIR="/usr/local/lib/csound/plugins"
  export CSSTRNGS="/usr/local/lib/csound/xmg"

  if [ "${LD_LIBRARY_PATH}" == "" ] ; then
      export LD_LIBRARY_PATH="/usr/local/lib/csound/lib"
  else
      export LD_LIBRARY_PATH="/usr/local/lib/csound/lib:${LD_LIBRARY_PATH}"
  fi

  exec "/usr/local/lib/csound/bin/csound" "$@"

Another example (/usr/local/bin/cvanal64):

  #!/bin/sh

  export OPCODEDIR64="/usr/local/lib/csound/plugins64"
  export CSSTRNGS="/usr/local/lib/csound/xmg"

  if [ "${LD_LIBRARY_PATH}" == "" ] ; then
      export LD_LIBRARY_PATH="/usr/local/lib/csound/lib"
  else
      export LD_LIBRARY_PATH="/usr/local/lib/csound/lib:${LD_LIBRARY_PATH}"
  fi

  exec "/usr/local/lib/csound/bin/csound64" -U cvanal "$@"

I generate the wrapper scripts with the following Python function:

pkgDir = '../__csound'
binDir = '/usr/local/bin'
binDir2 = '/usr/local/lib/csound/bin'
libDir2 = '/usr/local/lib/csound/lib'
pluginDir32 = '/usr/local/lib/csound/plugins'
pluginDir64 = '/usr/local/lib/csound/plugins64'
xmgDir = '/usr/local/lib/csound/xmg'

def makeFrontEnd(utilName, is64bit):
    fName = '%s%s/%s%s' % (pkgDir, binDir, utilName, ['', '64'][is64bit])
    f = open(fName, 'w')
    tmp =  '#!/bin/sh\n'
    tmp += '\n'
    tmp += 'export %s="%s"\n'
    tmp += 'export CSSTRNGS="%s"\n'
    tmp += '\n'
    tmp += 'if [ "${LD_LIBRARY_PATH}" == "" ] ; then\n'
    tmp += '    export LD_LIBRARY_PATH="%s"\n'
    tmp += 'else\n'
    tmp += '    export LD_LIBRARY_PATH="%s:${LD_LIBRARY_PATH}"\n'
    tmp += 'fi\n'
    tmp += '\n'
    tmp += 'exec "%s/%s"%s "$@"\n'
    print >> f, tmp % (['OPCODEDIR', 'OPCODEDIR64'][is64bit],
                       [pluginDir32, pluginDir64][is64bit],
                       xmgDir, libDir2, libDir2,
                       binDir2, ['csound', 'csound64'][is64bit],
                       ['', ' -U %s' % utilName][int(utilName != 'csound')])
    f.close
    os.chmod(fName, 0755)


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