Made `lookup_plugin_name()` return an `IntoIterator` for if we allow dirs to be plugins in the future. (Currently, it will always be just `Option`)

Added `PluginTrust<"a>: Cow<"a, Path>` as return type from this iterator, so the caller can know the trust of the path the plugin was loaded from.

Fortune for rng's current commit: Future blessing − 末吉

src/plugin/searcher.rs

@@ -6,6 +6,9 @@ use std::path::{
 };
 use std::{
     fs, io,
+    borrow::{
+	Cow, Borrow, 
+    },
     //collections::HashMap,
 };
 use regex::{
@@ -558,7 +561,89 @@ impl<P: AsRef<Path>> LookupVisitor<P>
     }
 }
 
-pub fn lookup_plugin_name(name: impl AsRef<str>) -> Option<PathBuf>
+/// Denoted a plugin and if it was loaded from a trusted path or not
+#[derive(Debug, Clone, Eq, Hash, PartialOrd, Ord)]
+pub enum PluginTrust<'a>
 {
-    todo!("Create a LookupVisitor(<path>) for each path in `locations`, then call `start_lookup(<trusted path>, name)` on each *in order* specified in `locations`")
+    Trusted(Cow<'a, Path>),
+    Untrusted(Cow<'a, Path>)
+}
+
+impl<'a> Borrow<Path> for PluginTrust<'a>
+{
+    #[inline(always)] 
+    fn borrow(&self) -> &Path
+    {
+	match self {
+	    Self::Trusted(a) | Self::Untrusted(a) => a.borrow()
+	}
+    }
+}
+
+impl<'a> AsRef<Path> for PluginTrust<'a>
+{
+    #[inline] 
+    fn as_ref(&self) -> &Path
+    {
+	self.borrow()
+    }
+}
+
+impl<'a> From<PluginTrust<'a>> for Cow<'a, Path>
+{
+    #[inline] 
+    fn from(from: PluginTrust<'a>) -> Self
+    {
+	match from {
+	    PluginTrust::Trusted(a) | PluginTrust::Untrusted(a) => a
+	}
+    }
+}
+
+impl<'a, T: AsRef<Path> + ?Sized> PartialEq<T> for PluginTrust<'a>
+{
+    #[inline] 
+    fn eq(&self, other: &T) -> bool
+    {
+	other.as_ref() == self.as_ref()
+    }
+}
+
+impl<'a> PluginTrust<'a>
+{
+    /// Was this plugin loaded from a trusted path?
+    #[inline(always)] 
+    pub fn is_trusted(&self) -> bool
+    {
+	if let Self::Trusted(_) = self {
+	    true
+	} else {
+	    false
+	}
+    }
+    
+    /// Was this plugin loaded from an untrusted path?
+    #[inline]
+    pub fn is_untrusted(&self) -> bool
+    {
+	!self.is_trusted()
+    }
+}
+
+impl From<PluginTrust<'static>> for PathBuf
+{
+    #[inline] 
+    fn from(from: PluginTrust<'static>) -> Self
+    {
+	match from {
+	    PluginTrust::Trusted(a) | PluginTrust::Untrusted(a) => a.into_owned()
+	}
+    }
+}
+
+
+pub fn lookup_plugin_name(name: impl AsRef<str>) -> impl IntoIterator<Item = PluginTrust<'static>> + Send + 'static
+{
+    todo!("Create a LookupVisitor(<path>) for each path in `locations`, then call `start_lookup(<trusted path>, name)` on each *in order* specified in `locations`");
+    None::<PluginTrust> //TODO: ^ see above
 }