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use std::str::FromStr;
use formula::Formula;
pub mod formula;
pub struct Scurvy {
free: Vec<String>,
pairs: Vec<Pair>,
unknown: Vec<(String, String)>,
print_help: bool,
print_version: bool,
}
struct Pair {
key: Argument,
values: Vec<String>,
}
impl Scurvy {
pub fn make(args: Vec<Argument>) -> Self {
let mut free = vec![];
let mut pairs: Vec<Pair> = args.into_iter().map(|a| a.into()).collect();
let mut unknown = vec![];
let mut print_help = false;
let mut print_version = false;
for arg in std::env::args().skip(1) {
if arg == "-h" || arg == "--help" || arg == "help=" {
print_help = true;
} else if arg == "-V" || arg == "--version" || arg == "version=" {
print_version = true;
}
match arg.split_once('=') {
None => free.push(arg),
Some((key, value)) => {
if let Some(pair) = pairs.iter_mut().find(|p| p.key.matches(key)) {
pair.values.push(value.to_owned());
} else {
unknown.push((key.to_owned(), value.to_owned()));
}
}
}
}
Self {
free,
pairs,
unknown,
print_help,
print_version,
}
}
pub fn should_print_help(&self) -> bool {
self.print_help
}
pub fn should_print_version(&self) -> bool {
self.print_version
}
pub fn free(&self) -> &[String] {
&self.free
}
fn get_pair(&self, key: &str) -> Option<&Pair> {
self.pairs.iter().find(|p| p.key.matches(key))
}
pub fn get(&self, key: &str) -> Option<&str> {
self.pairs
.iter()
.find(|p| p.key.matches(key))
.map(|p| p.values.first().map(|s| s.as_str()))
.flatten()
}
pub fn parse<T: FromStr, F: Into<Formula<T>>>(&self, key: &str, formula: F) -> Option<T> {
let formula = formula.into();
let Some(got) = self.get(key) else {
return None;
};
match got.parse::<T>() {
Ok(o) => {
if let Some((fail, mut check)) = formula.check_fn {
if !check(&o) {
let pair = self.get_pair(key).unwrap();
let str = fail.replace("[opt]", pair.key.preferred_key());
eprintln!("{str}");
std::process::exit(-1);
}
return Some(o);
};
Some(o)
}
Err(_e) => {
eprintln!("{}", formula.failure);
std::process::exit(-1);
}
}
}
pub fn parse_req<T: FromStr, F: Into<Formula<T>>>(&self, key: &str, formula: F) -> T {
let formula = formula.into();
let missing = formula.missing.clone();
match self.parse(key, formula) {
None => match missing {
None => {
let pair = self.get_pair(key).unwrap();
eprintln!("An argument for '{}' is required", pair.key.preferred_key());
std::process::exit(-1);
}
Some(misstr) => {
let pair = self.get_pair(key).unwrap();
let str = misstr.replace("[opt]", pair.key.preferred_key());
eprintln!("{str}");
std::process::exit(-1);
}
},
Some(o) => o,
}
}
}
pub struct Argument {
keys: Vec<String>,
arg_name: Option<&'static str>,
help: &'static str,
}
impl Argument {
pub fn new<'s, K: Into<SingleOrMultiple<'s>>>(key: K) -> Self {
let keys = match key.into() {
SingleOrMultiple::Single(s) => vec![s],
SingleOrMultiple::Multiple(m) => m.to_vec(),
};
Self {
keys: keys.into_iter().map(<_>::to_owned).collect(),
arg_name: None,
help: "",
}
}
pub fn arg(mut self, name: &'static str) -> Self {
self.arg_name = Some(name);
self
}
pub fn help(mut self, help: &'static str) -> Self {
self.help = help;
self
}
fn matches(&self, key: &str) -> bool {
self.keys.iter().find(|k| k.as_str() == key).is_some()
}
fn preferred_key(&self) -> &str {
self.keys.first().unwrap().as_str()
}
}
impl Into<Pair> for Argument {
fn into(self) -> Pair {
Pair {
key: self,
values: vec![],
}
}
}
pub enum SingleOrMultiple<'s> {
Single(&'s str),
Multiple(&'s [&'s str]),
}
impl<'s> From<&'s str> for SingleOrMultiple<'s> {
fn from(value: &'s str) -> Self {
Self::Single(value)
}
}
impl<'s> From<&'s [&'s str]> for SingleOrMultiple<'s> {
fn from(value: &'s [&'s str]) -> Self {
Self::Multiple(value)
}
}
impl<'s, const N: usize> From<&'s [&'s str; N]> for SingleOrMultiple<'s> {
fn from(value: &'s [&'s str; N]) -> Self {
Self::Multiple(value.as_slice())
}
}
|
