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src/config/error.rs

@@ -7,6 +7,7 @@ use std::{
 
 
 //TODO: Embed info about the file, the line number, the expression, etc?
+//      Will require writing own parser, that embeds such file metadata in its returned expressions. Maybe do this after functionality is implemented for program
 /// Error type for parsing config errors
 #[derive(Debug)]
 pub enum Error {

src/config/format.rs

@@ -113,13 +113,20 @@ impl LispExt for Vec<Sexp>
 }
 
 // Sexp doesn't use try_from(), so...
+/// Extension methods for getting typed values out of S-expression
 pub trait TryIntoExt: Sized
 {
+    /// Return this expression as a List (`Vec<Sexp>`) if possible
     fn try_into_list(self) -> Result<Vec<Sexp>, Error>;
+    
+    /// Return this expression as a non-descript atom if possible
     fn try_into_atom(self) -> Result<Atom, Error>;
 
+    /// Return this expression as a String if possible (atom)
     fn try_into_string(self) -> Result<String, Error>;
+    /// Return this expression as an integer if possible (atom)
     fn try_into_int(self) -> Result<i64, Error>;
+    /// Return this expression as a float if possible (atom)
     fn try_into_float(self) -> Result<f64, Error>;
 }
 
@@ -204,13 +211,21 @@ impl TryIntoExt for Atom
 
 
 // To avoid some `clone()`s
+/// Extension methods for getting typed references out of S-expression
 pub trait TryGetExt: Sized
 {
+    /// Try to get this expression as a reference `List` (slice of `Sexpr`).
     fn try_get_list(&self) -> Result<&[Sexp], Error>;
+    /// Try to get this expression as a reference atom.
     fn try_get_atom(&self) -> Result<&Atom, Error>;
 
+    /// Try to get this expression as a reference string (atom)
     fn try_get_string(&self) -> Result<&String, Error>;
+    
+    /// Try to get this expression as a reference integer (atom)
     fn try_get_int(&self) -> Result<&i64, Error>;
+    
+    /// Try to get this expression as a reference float (atom)
     fn try_get_float(&self) -> Result<&f64, Error>;
 }
 
@@ -253,3 +268,39 @@ impl TryGetExt for Sexp
 	}
     }
 }
+
+impl TryGetExt for Atom
+{
+    #[inline]
+    fn try_get_list(&self) -> Result<&[Sexp], Error>
+    {
+	Err(Error::bad_type(LispType::List, self))
+    }
+    #[inline]
+    fn try_get_atom(&self) -> Result<&Atom, Error>
+    {
+	Ok(self)
+    }
+
+    fn try_get_string(&self) -> Result<&String, Error>
+    {
+	match self {
+	    Self::S(string) => Ok(string),
+	    other => Err(Error::bad_type(LispType::String, other)),
+	}
+    }
+    fn try_get_int(&self) -> Result<&i64, Error>
+    {
+	match self {
+	    Self::I(int) => Ok(int),
+	    other => Err(Error::bad_type(LispType::Integer, other)),
+	}
+    }
+    fn try_get_float(&self) -> Result<&f64, Error>
+    {
+	match self {
+	    Self::F(float) => Ok(float),
+	    other => Err(Error::bad_type(LispType::Float, other)),
+	}
+    }       
+}

src/config/parse.rs

@@ -61,8 +61,7 @@ pub async fn global(to: &mut Config, path: impl AsRef<Path>) -> Result<(), error
     if path.exists() {
         let mut file = File::open(path).await?;
         let mut contents = if let Ok(Ok(wv)) = file.metadata().await
-	    .map(|x| x.len())
+	    .map(|x| usize::try_from(x.len())) {
-	    .map(|x| usize::try_from(x)) {
 		let mut out = Vec::with_capacity(wv+3);
 		out.push(b'(');
 		out