opt_get_verb: Get verb from the command line
In decisionpatterns/optigrab: Command-Line Parsing for an R World

Description Usage Arguments Details Value Assumptions See Also Examples

Return the verb for the application. The verb is the first argument that is not part of an option.

1	opt_get_verb(opts = commandArgs())

opts

character; Vector from which to parse options (default: commandArgs() )

Some applications such as git support command verbs, e.g. push, fetch, etc. These style arguments can be retrieved by opt_get_verb.

opt_get_verb look for the first unaccounted for options (after --args). The number of options needed by each flags is determined by and saved by calls to opt_get(). See the details to see how n is automatically determined. When not explicitly defined the number of options needed by each flag is 1. Becasue of this, it convention to call opt_get_verb after all opt_get calls. For most simple applications, it likely doesn't matter.

character of length 1; the verb found from the command-line. NA if a verb cannot be identified.

opt_get_verb assumes any flags occurring before the verb have exactly 1 value. A command line such as "> myscript –verbose verb" will be misparsed; the code will assume that "verb" is the value of the flag "–verbose"