dbus 0.7.1

Bindings to D-Bus, which is a bus commonly used on Linux for inter-process communication.
Documentation 
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use crate::{Message, MessageType};
use crate::strings::{BusName, Path, Interface, Member};

#[derive(Clone, Debug, Default)]
/// A "match rule", that can match Messages on its headers.
///
/// A field set to "None" means no filter for that header, 
/// a field set to "Some(_)" must match exactly.
pub struct MatchRule<'a> {
    /// Match on message type (you typically want to do this)
    pub msg_type: Option<MessageType>,
    /// Match on message sender
    pub sender: Option<BusName<'a>>,
    /// If false (the default), match if sender could possibly match, due to mismatch between unique names and taken bus names
    pub strict_sender: bool,
    /// Match on message object path
    pub path: Option<Path<'a>>,
    /// Match on message interface
    pub interface: Option<Interface<'a>>,
    /// Match on message member (signal or method name)
    pub member: Option<Member<'a>>,
    _more_fields_may_come: (),
}

fn msg_type_str(m: MessageType) -> &'static str {
    use crate::MessageType::*;
    match m {
        Signal => "signal",
        MethodCall => "method_call",
        MethodReturn => "method_return",
        Error => "error",
    }
}


impl<'a> MatchRule<'a> {
    /// Make a string which you can use in the call to "add_match".
    ///
    /// Panics: if msg_type is set to Some(MessageType::Invalid)
    pub fn match_str(&self) -> String {
        let mut v = vec!();
        if let Some(x) = self.msg_type { v.push(("type", msg_type_str(x))) };
        if let Some(ref x) = self.sender { v.push(("sender", &x)) };
        if let Some(ref x) = self.path { v.push(("path", &x)) };
        if let Some(ref x) = self.interface { v.push(("interface", &x)) };
        if let Some(ref x) = self.member { v.push(("member", &x)) };

        // For now we don't need to worry about internal quotes in strings as those are not valid names. 
        // If we start matching against arguments, we need to worry.
        let v: Vec<_> = v.into_iter().map(|(k, v)| format!("{}='{}'", k, v)).collect();
        v.join(",")
    }

    /// Returns whether or not the message matches the rule.
    pub fn matches(&self, msg: &Message) -> bool {
        if let Some(x) = self.msg_type { if x != msg.msg_type() { return false; }};

        if let Some(ref x) = self.sender {
            if let Some(s) = msg.sender() {
                let check = self.strict_sender || (s.starts_with(":") == x.starts_with(":"));
                if check && s != *x { return false }
            } else if self.strict_sender { return false }
        };
        if self.path.is_some() && msg.path() != self.path { return false };
        if self.interface.is_some() && msg.interface() != self.interface { return false };
        if self.member.is_some() && msg.member() != self.member { return false };
        true
    }

    /// Create a new struct which matches every message.
    pub fn new() -> Self { Default::default() }

    /// Create a new struct which matches signals on the interface and member name.
    pub fn new_signal<I: Into<Interface<'a>>, N: Into<Member<'a>>>(intf: I, name: N) -> Self {
        let mut m = Self::new();
        m.msg_type = Some(MessageType::Signal);
        m.interface = Some(intf.into());
        m.member = Some(name.into());
        m
    }


    /// Returns a clone with no borrowed references
    pub fn static_clone(&self) -> MatchRule<'static> {
        MatchRule {
            msg_type: self.msg_type,
            sender: self.sender.as_ref().map(|x| x.clone().into_static()),
            strict_sender: self.strict_sender,
            path: self.path.as_ref().map(|x| x.clone().into_static()),
            interface: self.interface.as_ref().map(|x| x.clone().into_static()),
            member: self.member.as_ref().map(|x| x.clone().into_static()),
            _more_fields_may_come: (),
        }
    }
}