[Rpm-maint] [rpm-software-management/rpm] Please add stdin support for `rpmspec -P` (Issue #1926)

[Andreas Schneider]

Hello,

I would be nice to have a stdin mode for `rpmspec -P`.

I'm using `rpmspec -P` in my neovim together with [null-ls](https://github.com/jose-elias-alvarez/null-ls.nvim/) to get warnings and errors directly displayed inside the editor. Currently it uses a temporary file, using stdin would be much faster ...

![rpmspec](https://user-images.githubusercontent.com/545480/154801492-0cfdf9b4-f925-4194-8c22-153b242251c7.png)

```
local helpers = require("null-ls.helpers")

local rpmspec = {
    name = "rpmspec",
    method = null_ls.methods.DIAGNOSTICS,
    filetypes = { "spec" },
    generator = null_ls.generator({
        command = "rpmspec",
        args = {
            "-P",
            "$FILENAME"
        },
        to_temp_file = true,
        from_stderr = true,
        format = "line",
        check_exit_code = { 0, 1 },
        on_output = helpers.diagnostics.from_patterns({
            -- error
            {
                pattern = [[(%w+): (.*): line (%d+): (.*)]],
                groups = { "severity", "filename", "row", "message" },
            },
            -- warning (completely differs from error)
            {
                pattern = [[(%w+): (.*) in line (%d+):]],
                groups = { "severity", "message", "row" },
            },
        }),
    }),
}

null_ls.register(rpmspec)
```

Also the error/warning could be a bit more consistent ... ;-)



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