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use std::{env, process};
use super::*;
#[derive(Debug, Clone)]
pub struct ArgParser {
name: String,
author: String,
version: String,
copyright: String,
info: String,
usage: String,
args: Vec<Arg>,
require_args: bool,
pub extra: Vec<String>,
}
impl ArgParser {
pub fn from_argv0() -> Self {
Self::new(&env::args().collect::<Vec<_>>()[0])
}
pub fn new(name: &str) -> Self {
let mut s = Self {
name: String::from(name),
author: String::new(),
version: String::new(),
copyright: String::new(),
info: String::new(),
usage: format!("{} [flags] [options]", name),
args: Vec::new(),
require_args: false,
extra: Vec::new(),
};
s.args(
vec!(
Arg::bool("help", false)
.short('h')
.help("Prints this dialogue"),
Arg::bool("version", false)
.short('v')
.help("Prints the version"),
)
);
s
}
pub fn author(&mut self, s: &str) -> &mut Self {
self.author = String::from(s);
self
}
pub fn version(&mut self, s: &str) -> &mut Self {
self.version = String::from(s);
self
}
pub fn copyright(&mut self, s: &str) -> &mut Self {
self.copyright = String::from(s);
self
}
pub fn info(&mut self, s: &str) -> &mut Self {
self.info = String::from(s);
self
}
pub fn usage(&mut self, s: &str) -> &mut Self {
self.usage = String::from(s);
self
}
pub fn require_args(&mut self, b: bool) -> &mut Self {
self.require_args = b;
self
}
pub fn args(&mut self, args: Vec<&mut Arg>) -> &mut Self{
for arg in args {
self.args.push(arg.clone());
}
self
}
fn set_arg(skip: &mut bool, arg: &mut Arg, next: Option<&String>) {
if let ArgVal::Bool(b) = arg.val {
arg.val = ArgVal::Bool(!b);
} else {
if let Some(next) = next {
if next.starts_with("--") || next.starts_with('-') {
Self::error_exit(&format!("argument \"{}\" where value for \"{}\" should be", next, arg.name));
}
arg.val = ArgVal::Str(next.to_owned());
*skip = true;
} else {
Self::error_exit(&format!("expected value for argument \"{}\"", arg.name));
}
}
}
pub fn get_str(&self, name: &str) -> String {
for arg in &self.args {
if arg.name == name {
if let ArgVal::Str(s) = &arg.val {
return s.clone();
}
}
}
String::new()
}
pub fn get_bool(&self, name: &str) -> bool {
for arg in &self.args {
if arg.name == name {
if let ArgVal::Bool(b) = &arg.val {
return *b;
}
}
}
false
}
pub fn parse(&mut self) -> &mut Self {
let mut args = env::args();
args.next();
self.parse_vec(args.collect::<Vec<String>>())
}
pub fn parse_vec(&mut self, args: Vec<String>) -> &mut Self {
if args.len() == 0 && self.require_args {
self.help_exit();
}
let mut skip = false;
for (idx,arg) in args.iter().enumerate() {
if skip {skip = false; continue}
if let Some(arg) = arg.strip_prefix("--") {
let mut exists = false;
self.args.iter_mut()
.filter(|parg| parg.name == arg)
.for_each(|mut parg| {Self::set_arg(&mut skip, &mut parg, args.get(idx+1)); exists = true});
if !exists {Self::error_exit(&format!("unexpected argument \"{}\"", arg));}
} else if let Some(arg) = arg.strip_prefix('-') {
for ch in arg.chars() {
let mut exists = false;
self.args.iter_mut()
.filter(|parg| parg.short != None)
.filter(|parg| parg.short.unwrap() == ch)
.for_each(|mut parg| {Self::set_arg(&mut skip, &mut parg, args.get(idx+1)); exists = true});
if !exists {Self::error_exit(&format!("unexpected argument \"{}\"", arg));}
}
} else {
self.extra.push(arg.to_owned());
}
}
if self.get_bool("help") {self.help_exit()}
else if self.get_bool("version") {self.version_exit()}
self
}
fn help_exit(&self) {
println!("{} {}\n{}\n{}\n{}\nUsage:\n\t{}\n",
self.name,
self.version,
self.author,
self.info,
self.copyright,
self.usage
);
let mut flags = Vec::new();
let mut options = Vec::new();
&self.args.iter().for_each(|arg| {
match arg.val {
ArgVal::Bool(_) => flags.push(arg),
ArgVal::Str(_) => options.push(arg),
}
});
let mut longest = 0;
&self.args.iter().for_each(|arg| if arg.name.len() > longest {longest = arg.name.len()});
longest += 4;
let print = |input: &Arg| {
match input.short {
Some(short) => print!("\t-{}, --{}", short, input.name),
None => print!("\t --{}", input.name),
}
for _ in input.name.len()..longest {print!(" ")}
println!("{}", input.help);
};
if flags.len() > 0 {
println!("Flags:");
flags.iter().for_each(|f| print(f));
}
if options.len() > 0 {
println!("Options:");
options.iter().for_each(|o| print(o));
}
process::exit(1);
}
fn version_exit(&self) {
println!("{} {}", self.name, self.version);
process::exit(1);
}
fn error_exit(message: &str) {
eprintln!("Error: {}\nTry \"-h\" or \"--help\" for more information.", message);
process::exit(1);
}
}