[−][src]Crate getopt_long
This crate is so simple. Just see the following example:
let help_long = "help".to_string(); let config_long = "config".to_string(); let list_long = "list".to_string(); let shell_long = "shell".to_string(); let run_long = "run".to_string(); let rows_long = "rows".to_string(); let row_id_long = "row-id".to_string(); let dict_long = "dictionary".to_string(); let longopts = &[ Opt::new( Some(help_long.clone()), help_long.chars().next(), HasArg::NoArgument, "help and version information", ) .map_err(|e| on_the_spot!(e))?, Opt::new( Some(config_long.clone()), config_long.chars().next(), HasArg::NoArgument, "config file name with full path", ) .map_err(|e| on_the_spot!(e))?, Opt::new( Some(list_long.clone()), list_long.chars().next(), HasArg::NoArgument, "list all dictionaries", ) .map_err(|e| on_the_spot!(e))?, Opt::new( Some(shell_long.clone()), shell_long.chars().next(), HasArg::NoArgument, "run as a Lua shell", ) .map_err(|e| on_the_spot!(e))?, Opt::new( Some(run_long.clone()), run_long.chars().next(), HasArg::RequiredArgument, "run a Lua script file", ) .map_err(|e| on_the_spot!(e))?, Opt::new( Some(rows_long.clone()), None, HasArg::NoArgument, "query rows count in a dictionary", ) .map_err(|e| on_the_spot!(e))?, Opt::new( Some(row_id_long.clone()), None, HasArg::RequiredArgument, "query a row information in a dictionary", ) .map_err(|e| on_the_spot!(e))?, Opt::new( Some(dict_long.clone()), dict_long.chars().next(), HasArg::RequiredArgument, "dictionary name used to query", ) .map_err(|e| on_the_spot!(e))?, ]; let opts = getopt_long(longopts).map_err(|e| on_the_spot!(e))?; let config = { let mut short = config_long.clone(); short.split_off(1); let config_name = if let Some(config) = opts.args.get(&short) { config.clone() } else if let Some(config) = opts.args.get(&config_long) { config.clone() } else { "/Users/xt/.dict/config.lua".to_string() }; Config::load(&config_name)? }; let action = loop { let mut short = help_long.clone(); short.split_off(1); if opts.args.get(&short).is_some() || opts.args.get(&help_long).is_some() { usage( "rdict", "query a word information from some remote dictionaries.", "0.1.0", longopts, ); break Action::Quit; } short = list_long.clone(); short.split_off(1); if opts.args.get(&short).is_some() || opts.args.get(&list_long).is_some() { break Action::List; } short = shell_long.clone(); short.split_off(1); if opts.args.get(&short).is_some() || opts.args.get(&shell_long).is_some() { break Action::Shell; } short = run_long.clone(); short.split_off(1); if let Some(script) = opts.args.get(&short) { break Action::Run {script: script.clone()} } else if let Some(script) = opts.args.get(&run_long) { break Action::Run {script: script.clone()} } short = dict_long.clone(); short.split_off(1); let dict_name = if let Some(dict) = opts.args.get(&short) { dict.clone() } else if let Some(dict) = opts.args.get(&dict_long) { dict.clone() } else { config.default_dictionary_name()? }; if opts.args.get(&rows_long).is_some() { break Action::Rows { dict: dict_name }; } if let Some(id) = opts.args.get(&row_id_long) { let id: u32 = id .parse() .map_err(|e: <u32 as std::str::FromStr>::Err| on_the_spot!(e))?; break Action::RowId { id, dict: dict_name, }; } break Action::Query { words: opts.operands.iter().map(|v| v.clone()).collect(), dict: dict_name, }; }; action.do_with_config(config).await
In a shell, key:
./hello -h
show as below:
Description:
query a word information from some remote dictionaries.
Version:
0.1.0
Usage:
rdict [options [args]] [operands]
Options:
-h, --help help and version information
-c, --config config file name with full path
-l, --list list all dictionaries
-s, --shell run as a Lua shell.
-r, --run =Arg run a Lua script file.
--rows query rows count in a dictionary
--row-id =Arg query a row information in a dictionary
-d, --dictionary =Arg dictionary name used to query
Just so. It is very simple and useful.
Structs
Arguments | |
Opt |
Enums
HasArg | |
OptError |
Functions
getopt_long | |
usage |
Type Definitions
OptResult |