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advanced.rs
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advanced.rs
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//
// Copyright (c) 2023 Piotr Stolarz
// GNU-like Command line options parser.
//
// Distributed under the 2-clause BSD License (the License)
// see accompanying file LICENSE for details.
//
// This software is distributed WITHOUT ANY WARRANTY; without even the
// implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
// See the License for more information.
//
use cmdopts::{parse_opts, InfoCode, ProcessCode, ParseError, CmdOpt};
fn print_usage()
{
eprintln!("Usage: {} [OPTION]... [--] FILE1 [FILE2]",
std::env::args().next().unwrap());
println!(r"
Available options:
-a, --long_a No value option
-b, --long_b=INT Option with integer value, range [-10..10]
-c, --long_c=STR Option with string value
-d Short option with string value
--long_e=STR Long option with string value
-h, --help Print this help
All options are optional. FILE1 is required, FILE2 is not.
Use -- separator to avoid ambiguity if file name starts with '-'.
")
}
#[derive(Debug)]
struct Options {
a_opt: Option<()>,
b_opt: Option<i32>,
c_opt: Option<String>,
d_opt: Option<String>,
e_opt: Option<String>,
file1: Option<String>,
file2: Option<String>,
help: Option<()>,
}
impl Default for Options {
fn default() -> Self {
Options {
a_opt: None,
b_opt: None,
c_opt: None,
d_opt: None,
e_opt: None,
file1: None,
file2: None,
help: None,
}
}
}
#[allow(unused_imports)]
fn process_cmdopts(opts: &mut Options) -> Result<(), ParseError>
{
use CmdOpt::*;
use InfoCode::*;
use ProcessCode::*;
use ParseError::*;
use OptId::*;
use std::cell::Cell;
#[derive(Clone)]
#[derive(Copy)]
enum OptId {
OptA,
OptB,
OptC,
OptD,
OptE,
OptHelp,
OptSwitch,
}
impl Default for OptId { fn default() -> Self { OptHelp } }
// processed option id
let opt_id: Cell<OptId> = Default::default();
// file parsing index (1-based), 0 for option parsing mode
let mut file_i = 0;
parse_opts(
|opt, constr| {
match opt {
Short(c) => {
match c {
'a' => { opt_id.set(OptA); NoValueOpt },
'b' => { opt_id.set(OptB); ValueOpt },
'c' => { opt_id.set(OptC); ValueOpt },
'd' => { opt_id.set(OptD); ValueOpt },
'h' => { opt_id.set(OptHelp); NoValueOpt },
'-' => {
constr.not_in_group();
opt_id.set(OptSwitch);
NoValueOpt
},
_ => InfoCode::InvalidOpt,
}
},
Long(s) => {
match s.as_str() {
"long_a" => { opt_id.set(OptA); NoValueOpt },
"long_b" => { opt_id.set(OptB); ValueOpt },
"long_c" => { opt_id.set(OptC); ValueOpt },
"long_e" => { opt_id.set(OptE); ValueOpt },
"help" => { opt_id.set(OptHelp); NoValueOpt },
_ => InfoCode::InvalidOpt,
}
},
}
},
|opt, val| {
// if true, mode needs to be switched at the return of the handler
let mut switch_mode = false;
// 1st standalone value switches the parser into files parsing mode
if file_i <= 0 && opt.is_none() {
file_i = 1;
switch_mode = true;
}
if file_i <= 0 {
//
// Options parser
//
// Options w/o associated value
//
let mut handled = true;
match opt_id.get() {
// print help and exit
OptHelp => {
opts.help = Some(());
return Ok(ProcessCode::Break);
},
OptSwitch => {
file_i = 1;
return Ok(ProcessCode::ToggleParsingMode);
},
OptA => {
opts.a_opt = Some(());
},
_ => {
handled = false;
},
}
if handled {
return Ok(ProcessCode::Continue);
}
// Options w/associated string value
//
let val_str = &val.as_ref().unwrap().val;
handled = true;
match opt_id.get() {
OptC => {
opts.c_opt = Some(val_str.clone());
},
OptD => {
opts.d_opt = Some(val_str.clone());
},
OptE => {
opts.e_opt = Some(val_str.clone());
},
_ => {
handled = false;
},
}
if handled {
return Ok(ProcessCode::Continue);
}
// Options w/associated int value
//
let opt_ref = opt.as_ref().unwrap();
let val_i: i32 = val_str.parse().map_err(|_| {
ParseError::InvalidOpt(opt_ref.clone(),
"Integer expected".to_string())
})?;
match opt_id.get() {
OptB => {
if val_i >= -10 && val_i <= 10 {
opts.b_opt = Some(val_i);
} else {
return Err(ParseError::InvalidOpt(opt_ref.clone(),
"Integer in range [-10..10] required".to_string()));
}
},
_ => {},
}
Ok(ProcessCode::Continue)
} else {
//
// Files parser
//
let val_str = &val.as_ref().unwrap().val;
match file_i {
1 => {
opts.file1 = Some(val_str.clone());
},
2 => {
opts.file2 = Some(val_str.clone());
},
_ => {
return Err(ParseError::GenericErr(
"Invalid number of files".to_string()));
},
}
file_i += 1;
if switch_mode {
Ok(ToggleParsingMode)
} else {
Ok(Continue)
}
}
})
}
pub fn main() -> Result<(), i32>
{
// CLI provided options
let mut opts: Options = Default::default();
let rc = process_cmdopts(&mut opts);
if rc.is_ok() {
if std::env::args().len() <= 1 || opts.help.is_some() {
print_usage();
} else if opts.file1.is_none() {
eprintln!("[ERROR] FILE1 required");
return Err(2);
} else {
println!("{:?}", opts);
}
} else {
eprintln!("[ERROR] {}", rc.unwrap_err());
return Err(1);
}
Ok(())
}