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147 lines
3.7 KiB
Rust
147 lines
3.7 KiB
Rust
use clap::Args;
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use std::fmt;
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use std::str::FromStr;
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/// Represents some command with arguments to execute.
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///
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/// NOTE: Must be derived with `#[clap(flatten)]` to properly take effect.
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#[derive(Args, Clone, Debug, PartialEq, Eq)]
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pub struct Cmd {
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/// The command to execute.
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#[clap(name = "CMD")]
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cmd: String,
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/// Arguments to provide to the command.
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#[clap(name = "ARGS")]
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args: Vec<String>,
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}
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impl Cmd {
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/// Creates a new command from the given `cmd`.
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pub fn new<C, I, A>(cmd: C, args: I) -> Self
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where
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C: Into<String>,
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I: Iterator<Item = A>,
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A: Into<String>,
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{
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Self {
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cmd: cmd.into(),
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args: args.map(Into::into).collect(),
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}
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}
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}
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impl From<Cmd> for String {
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fn from(cmd: Cmd) -> Self {
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cmd.to_string()
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}
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}
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impl fmt::Display for Cmd {
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fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
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write!(f, "{}", self.cmd)?;
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for arg in self.args.iter() {
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write!(f, " {arg}")?;
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}
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Ok(())
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}
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}
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impl<'a> From<&'a str> for Cmd {
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/// Parses `s` into [`Cmd`], or panics if unable to parse.
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fn from(s: &'a str) -> Self {
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s.parse().expect("Failed to parse into cmd")
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}
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}
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impl FromStr for Cmd {
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type Err = Box<dyn std::error::Error>;
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fn from_str(s: &str) -> Result<Self, Self::Err> {
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let tokens = if cfg!(unix) {
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shell_words::split(s)?
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} else if cfg!(windows) {
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winsplit::split(s)
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} else {
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unreachable!(
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"FromStr<Cmd>: Unsupported operating system outside Unix and Windows families!"
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);
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};
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// If we get nothing, then we want an empty command
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if tokens.is_empty() {
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return Ok(Self {
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cmd: String::new(),
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args: Vec::new(),
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});
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}
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let mut it = tokens.into_iter();
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Ok(Self {
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cmd: it.next().unwrap(),
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args: it.collect(),
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})
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}
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}
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/*
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impl FromArgMatches for Cmd {
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fn from_arg_matches(matches: &ArgMatches) -> Result<Self, Error> {
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let mut matches = matches.clone();
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Self::from_arg_matches_mut(&mut matches)
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}
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fn from_arg_matches_mut(matches: &mut ArgMatches) -> Result<Self, Error> {
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let cmd = matches.get_one::<String>("cmd").ok_or_else(|| {
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Error::raw(
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ErrorKind::MissingRequiredArgument,
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"program must be specified",
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)
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})?;
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let args: Vec<String> = matches
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.get_many::<String>("arg")
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.unwrap_or_default()
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.map(ToString::to_string)
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.collect();
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Ok(Self::new(format!("{cmd} {}", args.join(" "))))
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}
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fn update_from_arg_matches(&mut self, matches: &ArgMatches) -> Result<(), Error> {
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let mut matches = matches.clone();
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self.update_from_arg_matches_mut(&mut matches)
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}
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fn update_from_arg_matches_mut(&mut self, _matches: &mut ArgMatches) -> Result<(), Error> {
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Ok(())
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}
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}
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impl Args for Cmd {
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fn augment_args(cmd: Command) -> Command {
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cmd.arg(
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Arg::new("cmd")
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.required(true)
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.value_name("CMD")
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.help("")
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.action(ArgAction::Set),
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)
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.trailing_var_arg(true)
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.arg(
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Arg::new("arg")
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.value_name("ARGS")
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.num_args(1..)
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.action(ArgAction::Append),
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)
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}
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fn augment_args_for_update(cmd: Command) -> Command {
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Self::augment_args(cmd)
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}
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} */
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/* #[cfg(test)]
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mod tests {
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use super::*;
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#[test]
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fn verify_cmd() {
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Cmd::augment_args(Command::new("distant")).debug_assert();
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}
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} */
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