I recently upgraded Clap from version 2.33.3 to 4.4.2 in my Rust project. In the previous version, I used
matches.occurrences_of("verbosity")
to count the number of times a verbosity flag was provided, and
matches.is_present("silent")
to check if a silent flag was provided. However, it seems that in Clap 4.4.2, the occurrences_of method and the multiple attribute for arguments are no longer available. As a result, my code is not working as expected.
let _verbosity = matches.occurrences_of("verbosity");
let _is_silent = matches.is_present("silent");
// Determine verbosity level and log level based on command line arguments.
let log_level = if _is_silent {
log::LevelFilter::Error
} else if _verbosity <= 1 {
log::LevelFilter::Info
} else if _verbosity == 2 {
log::LevelFilter::Debug
} else {
log::LevelFilter::Trace
};`
and
let matches = Command::new("backend_snapshot")
.version("1.0")
.subcommand_required(true)
.about("A snapshot uploader and downloader")
.arg(
Arg::new("verbosity")
.short('v')
.num_args(1..)
.long("verbose")
.help("Increase verbosity level"),
)
.arg(
Arg::new("silent")
.short('s')
.long("silent")
.help("Decrease verbosity level, only important info,
warnings, errors are written"),
)
How can I achieve the same functionality in Clap 4.4.2 as I did in Clap 2.33.3 regarding counting the occurrences of an argument and checking if an argument is present?
I would appreciate any help or advice on how to adapt my code to work with Clap 4.4.2 or any alternative methods to achieve the same functionality.
From the migration guide:
arg!
now sets one of (#3795):
ArgAction::SetTrue
, requiringArgMatches::get_flag
instead ofArgMatches::is_present
ArgAction::Count
, requiringArgMatches::get_count
instead ofArgMatches::occurrences_of