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//! Simple command-line argument parser.
//!
//! No external dependencies. Supports `--flag`, `--key value`, `-v` (count),
//! and positional arguments.
use std::collections::HashMap;
/// Parsed command-line arguments.
pub struct Args {
pub flags: HashMap<String, String>,
pub positional: Vec<String>,
pub verbosity: u8,
pub quiet: u8,
}
impl Args {
/// Parse command-line arguments (skipping argv[0]).
pub fn parse() -> Self {
Self::parse_from(std::env::args().skip(1).collect())
}
/// Parse from a list of argument strings.
pub fn parse_from(args: Vec<String>) -> Self {
let mut flags = HashMap::new();
let mut positional = Vec::new();
let mut verbosity: u8 = 0;
let mut quiet: u8 = 0;
let mut iter = args.into_iter();
while let Some(arg) = iter.next() {
if arg == "--" {
// Everything after -- is positional
positional.extend(iter);
break;
} else if arg.starts_with("--") {
let key = arg[2..].to_string();
// Check for --key=value syntax
if let Some(eq_pos) = key.find('=') {
let (k, v) = key.split_at(eq_pos);
flags.insert(k.to_string(), v[1..].to_string());
} else {
// Boolean flags that don't take values
match key.as_str() {
"version" | "exampleconfig" | "help" | "stdin" | "stdout" | "force"
| "blackholed" => {
flags.insert(key, "true".into());
}
_ => {
// Next arg is the value
if let Some(val) = iter.next() {
flags.insert(key, val);
} else {
flags.insert(key, "true".into());
}
}
}
}
} else if arg.starts_with('-') && arg.len() > 1 {
// Short flags
let chars: Vec<char> = arg[1..].chars().collect();
for &c in &chars {
match c {
'v' => verbosity = verbosity.saturating_add(1),
'q' => quiet = quiet.saturating_add(1),
'a' | 'r' | 't' | 'j' | 'p' | 'P' | 'x' | 'D' | 'l' | 'f' | 'A' => {
flags.insert(c.to_string(), "true".into());
}
_ => {
// Short flag that may take a value: -c /path, -s rate
// Only consume next arg if it doesn't look like a flag
if chars.len() == 1 {
let next_is_value = iter
.as_slice()
.first()
.map(|s| !s.starts_with('-') || s == "-")
.unwrap_or(false);
if next_is_value {
let val = iter.next().unwrap();
flags.insert(c.to_string(), val);
} else {
flags.insert(c.to_string(), "true".into());
}
} else {
flags.insert(c.to_string(), "true".into());
}
}
}
}
} else {
positional.push(arg);
}
}
Args {
flags,
positional,
verbosity,
quiet,
}
}
/// Get a flag value by long or short name.
pub fn get(&self, key: &str) -> Option<&str> {
self.flags.get(key).map(|s| s.as_str())
}
/// Check if a flag is set.
pub fn has(&self, key: &str) -> bool {
self.flags.contains_key(key)
}
/// Get config path from --config or -c flag.
pub fn config_path(&self) -> Option<&str> {
self.get("config").or_else(|| self.get("c"))
}
}
#[cfg(test)]
mod tests {
use super::*;
fn args(s: &[&str]) -> Args {
Args::parse_from(s.iter().map(|s| s.to_string()).collect())
}
#[test]
fn parse_config_and_verbose() {
let a = args(&["--config", "/path/to/config", "-vv", "-s"]);
assert_eq!(a.config_path(), Some("/path/to/config"));
assert_eq!(a.verbosity, 2);
assert!(a.has("s"));
}
#[test]
fn parse_version() {
let a = args(&["--version"]);
assert!(a.has("version"));
}
#[test]
fn parse_positional() {
let a = args(&["-t", "abcd1234"]);
assert!(a.has("t"));
assert_eq!(a.positional, vec!["abcd1234"]);
}
#[test]
fn parse_short_config() {
let a = args(&["-c", "/my/config"]);
assert_eq!(a.config_path(), Some("/my/config"));
}
#[test]
fn parse_quiet() {
let a = args(&["-qq"]);
assert_eq!(a.quiet, 2);
}
#[test]
fn parse_new_boolean_flags() {
let a = args(&["-l", "-f", "-m", "-A"]);
assert!(a.has("l"));
assert!(a.has("f"));
assert!(a.has("m"));
assert!(a.has("A"));
}
#[test]
fn parse_long_boolean_flags() {
let a = args(&["--stdin", "--stdout", "--force", "--blackholed"]);
assert!(a.has("stdin"));
assert!(a.has("stdout"));
assert!(a.has("force"));
assert!(a.has("blackholed"));
}
#[test]
fn parse_exampleconfig() {
let a = args(&["--exampleconfig"]);
assert!(a.has("exampleconfig"));
}
#[test]
fn flag_with_value_vs_boolean() {
// -s with a non-flag value should capture it
let a = args(&["-s", "rate"]);
assert_eq!(a.get("s"), Some("rate"));
// -s followed by another flag should be boolean
let a = args(&["-s", "-v"]);
assert!(a.has("s"));
assert_eq!(a.get("s"), Some("true"));
assert_eq!(a.verbosity, 1);
// -m with a value
let a = args(&["-m", "5"]);
assert_eq!(a.get("m"), Some("5"));
// -m alone (boolean)
let a = args(&["-m"]);
assert!(a.has("m"));
// -B with a hash value
let a = args(&["-B", "abcdef1234567890"]);
assert_eq!(a.get("B"), Some("abcdef1234567890"));
// -B alone (boolean for base32 mode)
let a = args(&["-B"]);
assert!(a.has("B"));
}
}