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Gant -- Execute Tool |
Executing programs and shell scripts can be problematic. It generally involves multiple processes and pipes, and pipes need to be emptied as well as filled or everything can block. The techniques for dealing with this are well known and indeed idiomatic, effectively just boilerplate code. So to avoid everyone having to write the same thing many times, this tool provides the boilerplate code.
To get access to the tool:
{%highlight groovy%} includeTool << gant.tools.Execute {%endhighlight%}
Two methods are then available, executable and shell. The former is used to invoke an executable, whilst the latter invokes a shell that parses and executes the command passed. So for example:
{%highlight groovy%} execute.shell 'echo "Hello" && echo "World!"' {%endhighlight%}
By default output from the executing program is passed through, the programs standard out to the curtrent standard out, and the programms standard error to the current standard error. If this is not the desired behaviour then keyword parameters can be used to alter this. The keywords errProcessing and outProcessing can be assigned closures which are executed in place of the defaults.
{%highlight groovy%} execute.shell 'echo "Hello" && echo "World!"', outProcessing: {} {%endhighlight%}
causes all output from the shell on the standard output to be ignored.
Currently there are two overloads of executable, one taking a single string as the command, teh other taking a list of strings as the command.