mirror of
https://github.com/clap-rs/clap
synced 2024-12-13 22:32:33 +00:00
647896d929
This is the derive support for #3774 (see also #3775, #3777) This combined with `value_parser` replaces `parser`. The main frustration with this is that `ArgAction::Count` (the replacement for `parse(from_occurrences)` must be a `u64`. We could come up with a magic attribute that is meant to be the value parser's parsed type. We could then use `TryFrom` to convert the parsed type to the user's type to allow more. That is an exercise for the future. Alternatively, we have #3792. Prep for this included - #3782 - #3783 - #3786 - #3789 - #3793
93 lines
2.7 KiB
Rust
93 lines
2.7 KiB
Rust
use clap::{CommandFactory, ErrorKind, Parser};
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#[derive(Parser)]
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#[clap(author, version, about, long_about = None)]
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struct Cli {
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/// set version manually
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#[clap(long, value_name = "VER", value_parser)]
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set_ver: Option<String>,
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/// auto inc major
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#[clap(long, action)]
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major: bool,
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/// auto inc minor
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#[clap(long, action)]
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minor: bool,
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/// auto inc patch
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#[clap(long, action)]
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patch: bool,
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/// some regular input
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#[clap(value_parser)]
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input_file: Option<String>,
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/// some special input argument
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#[clap(long, value_parser)]
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spec_in: Option<String>,
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#[clap(short, value_parser)]
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config: Option<String>,
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}
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fn main() {
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let cli = Cli::parse();
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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) = cli.set_ver.as_deref() {
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if cli.major || cli.minor || cli.patch {
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let mut cmd = Cli::command();
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cmd.error(
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ErrorKind::ArgumentConflict,
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"Can't do relative and absolute version change",
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)
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.exit();
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}
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ver.to_string()
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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) = (cli.major, cli.minor, cli.patch);
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match (maj, min, pat) {
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(true, false, false) => major += 1,
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(false, true, false) => minor += 1,
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(false, false, true) => patch += 1,
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_ => {
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let mut cmd = Cli::command();
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cmd.error(
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ErrorKind::ArgumentConflict,
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"Can only modify one version field",
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)
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.exit();
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}
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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 let Some(config) = cli.config.as_deref() {
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// todo: remove `#[allow(clippy::or_fun_call)]` lint when MSRV is bumped.
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#[allow(clippy::or_fun_call)]
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let input = cli
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.input_file
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.as_deref()
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// 'or' is preferred to 'or_else' here since `Option::as_deref` is 'const'
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.or(cli.spec_in.as_deref())
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.unwrap_or_else(|| {
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let mut cmd = Cli::command();
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cmd.error(
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ErrorKind::MissingRequiredArgument,
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"INPUT_FILE or --spec-in is required when using --config",
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)
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.exit()
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});
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println!("Doing work using input {} and config {}", input, config);
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}
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}
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