misc: remove anyhow dependency

Cargo.lock

@@ -60,12 +60,6 @@ dependencies = [
  "windows-sys",
 ]
 
-[[package]]
-name = "anyhow"
-version = "1.0.75"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "a4668cab20f66d8d020e1fbc0ebe47217433c1b6c8f2040faf858554e394ace6"
-
 [[package]]
 name = "autocfg"
 version = "1.1.0"
@@ -328,7 +322,6 @@ checksum = "8f232d6ef707e1956a43342693d2a31e72989554d58299d7a88738cc95b0d35c"
 name = "mute"
 version = "0.1.0"
 dependencies = [
- "anyhow",
  "clap",
  "rstest",
  "rustyline",

Cargo.toml

@@ -9,7 +9,6 @@ name = "mute"
 path = "src/bin/cli.rs"
 
 [dependencies]
-anyhow = "1.0.75"
 clap = { version = "4.5.4", features = ["derive"] }
 rustyline = "14.0.0"
 thiserror = "1.0.48"

src/bin/cli.rs

@@ -1,8 +1,7 @@
-use anyhow::Result;
 use clap::{Parser, Subcommand};
 use rustyline::{error::ReadlineError, DefaultEditor};
 
-use mute::{eval, parse, Environment, Node};
+use mute::{eval, parse, Environment, Node, Result};
 
 #[derive(Debug, Parser)]
 #[clap(version, author, about)]

src/env/io.rs

@@ -36,7 +36,8 @@ pub(super) fn io() -> HashMap<String, Node> {
 
                 let val = args[0].borrow();
                 if let Node::String(path) = val {
-                    let contents = std::fs::read_to_string(path)?;
+                    let contents = std::fs::read_to_string(path)
+                        .map_err(|err| Error::SystemError(err.to_string()))?;
                     return Ok(Node::String(contents));
                 }
 

src/error.rs

@@ -23,6 +23,8 @@ pub enum Error {
     ExpectedString,
     #[error("expected {0} arguments, got {1}")]
     MismatchedArgCount(usize, usize),
+    #[error("system error {0}")]
+    SystemError(String),
 
     #[error("please file a bug report")]
     Unreachable,

src/evaluator.rs

@@ -1,6 +1,6 @@
 use std::borrow::Borrow;
 
-use anyhow::Result;
+use crate::Result;
 
 use crate::env::Environment;
 use crate::error::Error;

src/lib.rs

@@ -13,6 +13,6 @@ pub fn parse(input: &str) -> Result<Vec<Node>> {
     parser::parse_str(input)
 }
 
-pub fn eval(env: &Environment, input: Vec<Node>) -> anyhow::Result<Vec<Node>> {
+pub fn eval(env: &Environment, input: Vec<Node>) -> Result<Vec<Node>> {
     evaluator::eval(env, input)
 }

src/node.rs

@@ -1,6 +1,6 @@
 use std::collections::HashMap;
 
-use anyhow::Result;
+use crate::Result;
 
 use crate::env::Environment;