rethink commands to allow any number of args

[mvdan]

Right now, commands are always of the form -A expr. I propose that we redesign them so that any number of arguments may be used.

For example, let's say that we want to add a command that lets us control how many occurences of a match we want to have. For example, -c '>= 2' expr. Then, -g expr would be short for -c '> 0' expr, and -v expr would be short for -c '== 0' expr.

If we are to allow any number of arguments, we should drop the notion of flags entirely, as they typically only allow 0 or 1 values. I still think a preceding character other than - would be useful to visualise the start of these chained commands.

I propose ., for example:

gogrep .x expr1 .c '>= 2' expr2

Suggestions of more commands that would use more information than an expression to match are welcome.

@rogpeppe thoughts?

[mvdan]

I'm not going to do this. Instead, gogrep will expose a nice API to write complex queries as Go code. In a way that would resemble writing a linter, but in a much simpler and higher-level way, while also having full access to custom logic via Go code.