mirror of
https://github.com/clap-rs/clap
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c9eef44213
This was ported over from the usage parser which modeled after docopt. We just never got around to implementing the rest of the syntax. However, when considering this as a standalone feature, an `arg!(--flag <value>)`, outside of other context, should be optional. This is how the help would display it. Fixes #4206
78 lines
2.7 KiB
Rust
78 lines
2.7 KiB
Rust
use std::path::PathBuf;
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use clap::{arg, command, value_parser, ArgAction, ArgGroup};
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fn main() {
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// Create application like normal
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let matches = command!() // requires `cargo` feature
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// Add the version arguments
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.arg(arg!(--"set-ver" <VER> "set version manually"))
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.arg(arg!(--major "auto inc major").action(ArgAction::SetTrue))
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.arg(arg!(--minor "auto inc minor").action(ArgAction::SetTrue))
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.arg(arg!(--patch "auto inc patch").action(ArgAction::SetTrue))
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// Create a group, make it required, and add the above arguments
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.group(
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ArgGroup::new("vers")
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.required(true)
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.args(["set-ver", "major", "minor", "patch"]),
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)
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// Arguments can also be added to a group individually, these two arguments
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// are part of the "input" group which is not required
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.arg(
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arg!([INPUT_FILE] "some regular input")
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.value_parser(value_parser!(PathBuf))
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.group("input"),
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)
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.arg(
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arg!(--"spec-in" <SPEC_IN> "some special input argument")
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.value_parser(value_parser!(PathBuf))
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.group("input"),
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)
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// Now let's assume we have a -c [config] argument which requires one of
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// (but **not** both) the "input" arguments
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.arg(
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arg!(config: -c <CONFIG>)
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.value_parser(value_parser!(PathBuf))
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.requires("input"),
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)
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.get_matches();
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// Let's assume the old version 1.2.3
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let mut major = 1;
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let mut minor = 2;
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let mut patch = 3;
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// See if --set-ver was used to set the version manually
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let version = if let Some(ver) = matches.get_one::<String>("set-ver") {
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ver.to_owned()
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} else {
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// Increment the one requested (in a real program, we'd reset the lower numbers)
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let (maj, min, pat) = (
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matches.get_flag("major"),
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matches.get_flag("minor"),
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matches.get_flag("patch"),
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);
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match (maj, min, pat) {
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(true, _, _) => major += 1,
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(_, true, _) => minor += 1,
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(_, _, true) => patch += 1,
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_ => unreachable!(),
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};
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format!("{}.{}.{}", major, minor, patch)
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};
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println!("Version: {}", version);
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// Check for usage of -c
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if matches.contains_id("config") {
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let input = matches
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.get_one::<PathBuf>("INPUT_FILE")
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.unwrap_or_else(|| matches.get_one::<PathBuf>("spec-in").unwrap())
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.display();
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println!(
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"Doing work using input {} and config {}",
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input,
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matches.get_one::<PathBuf>("config").unwrap().display()
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);
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}
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}
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