[esafak]

Yes, using shell functions:

  git_log() {
    git log --pretty=tformat:'%at %ae'
  }

Separating function definitions allows you to run, test, and re-use them.

[DSpinellis]

And, more importantly, assign a name to a process, so that it can appear multiple times in the graph.

[UltraSane]

You might want to try looking at the Neo4j query language Cypher for some possible inspiration for the syntax.