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TODO clean this up, for now collect snippets

There are the if and branch commands to implement conditional execution of other commands. The difference is that if takes argument expressions, while branch takes a command list and then does its own evaluation.

The following example shows a method definition, using if with (…) syntax for its arguments:

# COMMAND: Return path to item data (never empty, unlike `d.base_path`);
#          multi-file items return a path ending with a '/'. 
method.insert = d.data_path, simple,\
    "if=(d.is_multi_file),\
        (cat, (d.directory), /),\
        (cat, (d.directory), /, (d.name))"