pub fn parse(
    command_line: &Vec<&str>,
    spec: &CliSpec
) -> Result<CliParsed, ParserError>
Expand description

Parsers the given command line based on the given spec and returns the result.
In case of error (such as invalid input), an error will be returned.
In case the command line does not match the spec, Ok(None) will be returned.

Example

use cliparser::types::{
    Argument, ArgumentHelp, ArgumentOccurrence, ArgumentValueType, CliSpec, CliSpecMetaInfo,
    Command, PositionalArgument,
};
use cliparser::{help, parse, version};
use std::collections::{HashMap, HashSet};

fn main() {
    let mut cli_spec = CliSpec::new();

    // Add meta info to support help and version text generation
    cli_spec = cli_spec
        .set_meta_info(Some(CliSpecMetaInfo {
            author: Some("Sagie Gur-Ari".to_string()),
            version: Some("1.2.3-beta".to_string()),
            description: Some("Amazing example".to_string()),
            project: Some("example".to_string()),
            help_post_text: Some(
                "See more info at: https://github.com/sagiegurari/cargo-make".to_string(),
            ),
        }))
        // Define the prefix of the arguments.
        // It can be a command/s (path prefix ignored) and/or a sub command/s
        // If not defined, the parsing will start checking the arguments only.
        // In this example, the spec defines two ways to invoke a process, either
        // as 'makers' or as 'cargo make' and afterwards the arguments.
        .add_command("makers")
        .add_subcommand(vec!["cargo", "make"])
        // Positional arguments come after all the known argument keys.
        // If the positional is None, positional arguments are not allowed.
        // Add -- to the command line forces positional arguments and stops key
        // based argument parsing.
        .set_positional_argument(Some(PositionalArgument {
            name: "args".to_string(),
            help: Some(ArgumentHelp::TextAndParam(
                "The command line arguments".to_string(),
                "ARGS".to_string(),
            )),
        }))
        // Add a 'flag' only argument which is an argument that does not accept any value.
        // You can define multiple variations of the parameter name.
        // For example, in this case putting --flag or -f in the command line would be parsed
        // as the 'flag' parameter.
        .add_argument(Argument {
            name: "flag".to_string(),
            key: vec!["--flag".to_string(), "-f".to_string()],
            argument_occurrence: ArgumentOccurrence::Single,
            value_type: ArgumentValueType::None,
            default_value: None,
            help: Some(ArgumentHelp::Text(
                "A flag without value example".to_string(),
            )),
        })
        // Add an argument that accepts a single value, for example -s value
        .add_argument(Argument {
            name: "single".to_string(),
            key: vec!["--s1".to_string(), "-s".to_string()],
            argument_occurrence: ArgumentOccurrence::Single,
            value_type: ArgumentValueType::Single,
            default_value: None,
            help: Some(ArgumentHelp::Text(
                "A parameter with single value example".to_string(),
            )),
        })
        // Add an argument that accepts multiple values
        .add_argument(Argument {
            name: "mo".to_string(),
            key: vec!["--mo1".to_string(), "-mo2".to_string()],
            argument_occurrence: ArgumentOccurrence::Multiple,
            value_type: ArgumentValueType::Single,
            default_value: None,
            help: Some(ArgumentHelp::Text(
                "A parameter with multiple values example".to_string(),
            )),
        })
        // Add an argument that can appear multiple times.
        // Even if the value type if Single, multiple occurrences will
        // enable the argument to collect multiple values (one for each occurrence).
        .add_argument(Argument {
            name: "mv".to_string(),
            key: vec!["--mv1".to_string(), "-mv2".to_string()],
            argument_occurrence: ArgumentOccurrence::Single,
            value_type: ArgumentValueType::Multiple,
            default_value: None,
            help: Some(ArgumentHelp::Text(
                "A parameter with single value but can appear multiple times example".to_string(),
            )),
        })
        // We can define a 'default' value.
        // In case the argument is not in the command line, we will get the default value.
        // However, the argument names list in the parsed struct will not include this
        // argument as it was not found. Only the argument values will contain it.
        // This is a good way to understand that we have a value but it was not entered by the caller.
        .add_argument(Argument {
            name: "default".to_string(),
            key: vec!["--d1".to_string(), "-d".to_string()],
            argument_occurrence: ArgumentOccurrence::Single,
            value_type: ArgumentValueType::Single,
            default_value: Some("some default".to_string()),
            help: Some(ArgumentHelp::Text(
                "A parameter with default value example".to_string(),
            )),
        });

    // Parsers the given command line based on the given spec and returns the result.
    // In case of invalid input or the provided spec does not match the command line, an error will be returned.
    // In order to parse the process command line instead of providing it, use the parse_process.
    // Also, if you want to provide multiple specs and have each one checked, until the first one
    // which fits is found, use the parse_any and parse_process_any functions.
    let result = parse(
        &vec![
            "cargo", "make", "-mv2", "4", "5", "6", "--mo1=1", "-mo2", "2", "-f", "-s", "3",
            "arg1", "arg2", "-mo2", "arg5",
        ],
        &cli_spec,
    );

    // The CliParsed struct includes multiple members that define what was found
    // arguments - A collection of all arguments found (list of names not keys).
    // Arguments that were not found by defaulted to a given value will not be listed here.
    // argument_values - A map of all values for arguments found.
    // The map will exclude arguments that do not accept value but include arguments not provided
    // on the command line but were defaulted to a given value.
    // The map keys are the argument names (not keys) and the value is the list of all values
    // found for all occurrences.
    assert!(result.is_ok());
    let cli_parsed = result.unwrap();
    println!("Cli Parsed:\n{:?}", &cli_parsed);

    let mut argument_names = HashSet::new();
    argument_names.insert("flag".to_string());
    argument_names.insert("single".to_string());
    argument_names.insert("mo".to_string());
    argument_names.insert("mv".to_string());
    argument_names.insert("args".to_string());
    let mut argument_values = HashMap::new();
    argument_values.insert("single".to_string(), vec!["3".to_string()]);
    argument_values.insert("mo".to_string(), vec!["1".to_string(), "2".to_string()]);
    argument_values.insert(
        "mv".to_string(),
        vec!["4".to_string(), "5".to_string(), "6".to_string()],
    );
    argument_values.insert(
        "args".to_string(),
        vec![
            "arg1".to_string(),
            "arg2".to_string(),
            "-mo2".to_string(),
            "arg5".to_string(),
        ],
    );
    argument_values.insert("default".to_string(), vec!["some default".to_string()]);
    assert_eq!(cli_parsed.arguments, argument_names);
    assert_eq!(cli_parsed.argument_values, argument_values);

    // generate help text
    let help_text = help(&cli_spec);
    println!("{}", help_text);

    // generate version text
    let version_text = version(&cli_spec);
    println!("{}", version_text);
}