Simple command line parser.
This library provide a very simple API to parse command line arguments.
It will not cover all possible use cases in order to ensure a simple thin API.
The following is a simple usage example (there are more capabilities, see API docs):
use cliparser::types::{
Argument, ArgumentHelp, ArgumentOccurrence, ArgumentValueType, CliSpec, CliSpecMetaInfo,
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);
}In order to use this library, just add it as a dependency:
[dependencies]
cliparser = "^0.1.2"See full docs at: API Docs
See Changelog
Developed by Sagie Gur-Ari and licensed under the Apache 2 open source license.