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Shebang

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dtmilano edited this page Apr 29, 2013 · 4 revisions

shebang

Shebang extends the standard shebang line functionality found on Linux, Mac OSX and Windows Cygwin allowing for use cases that would be otherwise impossible.

See the details at https://github.com/dtmilano/shebang

Using shebang with AndroidViewClient scripts

shebang can be used to simplify script creation and the way scripts locate AndroidViewClient modules.

Linux

A typical shebang for a script would be:

#! /usr/local/bin/shebang monkeyrunner -plugin $AVC_HOME/bin/androidviewclient-$AVC_VERSION.jar @!

This shebang line uses:

  • Absolute path of shebang to enable the use of shebang line extensions
  • monkeyrunner set as the interpreter for the script
  • $AVC_HOME environment variable to locate AndroidViewClient installation (AVC_HOME is used instead of ANDRODI_VIEW_CLIENT_HOME to reduce the shebang command line length and prevent reaching Linux maximum length which is BINPRM_BUF_SIZE = 128)
  • $AVC_VERSION to specify the jar version to be used (AVC_VERSION is used instead of ANDRODI_VIEW_CLIENT_VERSION to reduce the shebang command line length and prevent reaching Linux maximum length which is BINPRM_BUF_SIZE = 128)
  • @! to mark the end of shebang arguments

Mac OS X

A typical shebang for a script would be:

#! /usr/bin/env shebang monkeyrunner -plugin $ANDROID_VIEW_CLIENT_HOME/bin/androidviewclient-$ANDROID_VIEW_CLIENT_VERSION.jar @!

This shebang line uses:

  • /usr/bin/env to look for shebang executable in PATH
  • shebang to enable the use of shebang line extensions
  • monkeyrunner set as the interpreter for the script
  • $ANDROID_VIEW_CLIENT_HOME environment variable to locate AndroidViewClient installation
  • $ANDROID_VIEW_CLIENT_VERSION to specify the jar version to be used
  • @! to mark the end of shebang arguments

Imports

Using previous shebang command line permits to further simplify the imports as showed by this snippet:

#! /usr/bin/env shebang monkeyrunner -plugin $ANDROID_VIEW_CLIENT_HOME/bin/androidviewclient-$ANDROID_VIEW_CLIENT_VERSION.jar @!

from com.dtmilano.android.viewclient import ViewClient
...
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