slightly fancier errors

11 files changed, 274 insertions, 77 deletions

diff --git a/Cargo.lock b/Cargo.lock
index c8f9b6f..4402612 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -1,6 +1,21 @@
 # This file is automatically @generated by Cargo.
 # It is not intended for manual editing.
 [[package]]
+name = "addr2line"
+version = "0.14.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a55f82cfe485775d02112886f4169bde0c5894d75e79ead7eafe7e40a25e45f7"
+dependencies = [
+ "gimli",
+]
+
+[[package]]
+name = "adler"
+version = "1.0.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f26201604c87b1e01bd3d98f8d5d9a8fcbb815e8cedb41ffccbeb4bf593a35fe"
+
+[[package]]
 name = "aho-corasick"
 version = "0.7.15"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -19,12 +34,6 @@ dependencies = [
 ]
 
 [[package]]
-name = "anyhow"
-version = "1.0.40"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "28b2cd92db5cbd74e8e5028f7e27dd7aa3090e89e4f2a197cc7c8dfb69c7063b"
-
-[[package]]
 name = "arrayref"
 version = "0.3.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -54,6 +63,20 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "cdb031dd78e28731d87d56cc8ffef4a8f36ca26c38fe2de700543e627f8a464a"
 
 [[package]]
+name = "backtrace"
+version = "0.3.56"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9d117600f438b1707d4e4ae15d3595657288f8235a0eb593e80ecc98ab34e1bc"
+dependencies = [
+ "addr2line",
+ "cfg-if",
+ "libc",
+ "miniz_oxide",
+ "object",
+ "rustc-demangle",
+]
+
+[[package]]
 name = "base64"
 version = "0.13.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -110,6 +133,33 @@ dependencies = [
 ]
 
 [[package]]
+name = "color-eyre"
+version = "0.5.10"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "7b29030875fd8376e4a28ef497790d5b4a7843d8d1396bf08ce46f5eec562c5c"
+dependencies = [
+ "backtrace",
+ "color-spantrace",
+ "eyre",
+ "indenter",
+ "once_cell",
+ "owo-colors",
+ "tracing-error",
+]
+
+[[package]]
+name = "color-spantrace"
+version = "0.1.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b6eee477a4a8a72f4addd4de416eb56d54bc307b284d6601bafdee1f4ea462d1"
+dependencies = [
+ "once_cell",
+ "owo-colors",
+ "tracing-core",
+ "tracing-error",
+]
+
+[[package]]
 name = "constant_time_eq"
 version = "0.1.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -147,6 +197,16 @@ dependencies = [
 ]
 
 [[package]]
+name = "eyre"
+version = "0.6.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "221239d1d5ea86bf5d6f91c9d6bc3646ffe471b08ff9b0f91c44f115ac969d2b"
+dependencies = [
+ "indenter",
+ "once_cell",
+]
+
+[[package]]
 name = "funty"
 version = "1.1.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -175,6 +235,12 @@ dependencies = [
 ]
 
 [[package]]
+name = "gimli"
+version = "0.23.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f6503fe142514ca4799d4c26297c4248239fe8838d827db6bd6065c6ed29a6ce"
+
+[[package]]
 name = "glob"
 version = "0.3.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -199,6 +265,21 @@ dependencies = [
 ]
 
 [[package]]
+name = "indenter"
+version = "0.3.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ce23b50ad8242c51a442f3ff322d56b02f08852c77e4c0b4d3fd684abc89c683"
+
+[[package]]
+name = "jane-eyre"
+version = "0.3.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "7ccd957c837e264dcbc6e75b58fcf85fd329a66e4836f820779c40563a2d0be0"
+dependencies = [
+ "color-eyre",
+]
+
+[[package]]
 name = "lazy_static"
 version = "1.4.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -227,9 +308,10 @@ checksum = "8916b1f6ca17130ec6568feccee27c156ad12037880833a3b842a823236502e7"
 name = "makers"
 version = "0.1.0"
 dependencies = [
- "anyhow",
  "dirs",
+ "eyre",
  "glob",
+ "jane-eyre",
  "lazy_static",
  "nom",
  "regex",
@@ -244,6 +326,16 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "0ee1c47aaa256ecabcaea351eae4a9b01ef39ed810004e298d2511ed284b1525"
 
 [[package]]
+name = "miniz_oxide"
+version = "0.4.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a92518e98c078586bc6c934028adcca4c92a53d6a958196de835170a01d84e4b"
+dependencies = [
+ "adler",
+ "autocfg",
+]
+
+[[package]]
 name = "nom"
 version = "6.1.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -257,6 +349,30 @@ dependencies = [
 ]
 
 [[package]]
+name = "object"
+version = "0.23.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a9a7ab5d64814df0fe4a4b5ead45ed6c5f181ee3ff04ba344313a6c80446c5d4"
+
+[[package]]
+name = "once_cell"
+version = "1.7.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "af8b08b04175473088b46763e51ee54da5f9a164bc162f615b91bc179dbf15a3"
+
+[[package]]
+name = "owo-colors"
+version = "1.3.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "2386b4ebe91c2f7f51082d4cefa145d030e33a1842a96b12e4885cc3c01f7a55"
+
+[[package]]
+name = "pin-project-lite"
+version = "0.2.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "dc0e1f259c92177c30a4c9d177246edd0a3568b25756a977d0632cf8fa37e905"
+
+[[package]]
 name = "ppv-lite86"
 version = "0.2.10"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -415,12 +531,27 @@ dependencies = [
 ]
 
 [[package]]
+name = "rustc-demangle"
+version = "0.1.18"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "6e3bad0ee36814ca07d7968269dd4b7ec89ec2da10c4bb613928d3077083c232"
+
+[[package]]
 name = "ryu"
 version = "1.0.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "71d301d4193d031abdd79ff7e3dd721168a9572ef3fe51a1517aba235bd8f86e"
 
 [[package]]
+name = "sharded-slab"
+version = "0.1.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "79c719719ee05df97490f80a45acfc99e5a30ce98a1e4fb67aee422745ae14e3"
+dependencies = [
+ "lazy_static",
+]
+
+[[package]]
 name = "static_assertions"
 version = "1.1.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -497,6 +628,68 @@ dependencies = [
 ]
 
 [[package]]
+name = "thread_local"
+version = "1.1.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8018d24e04c95ac8790716a5987d0fec4f8b27249ffa0f7d33f1369bdfb88cbd"
+dependencies = [
+ "once_cell",
+]
+
+[[package]]
+name = "tracing"
+version = "0.1.25"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "01ebdc2bb4498ab1ab5f5b73c5803825e60199229ccba0698170e3be0e7f959f"
+dependencies = [
+ "cfg-if",
+ "pin-project-lite",
+ "tracing-attributes",
+ "tracing-core",
+]
+
+[[package]]
+name = "tracing-attributes"
+version = "0.1.15"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "c42e6fa53307c8a17e4ccd4dc81cf5ec38db9209f59b222210375b54ee40d1e2"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn",
+]
+
+[[package]]
+name = "tracing-core"
+version = "0.1.17"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f50de3927f93d202783f4513cda820ab47ef17f624b03c096e86ef00c67e6b5f"
+dependencies = [
+ "lazy_static",
+]
+
+[[package]]
+name = "tracing-error"
+version = "0.1.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b4d7c0b83d4a500748fa5879461652b361edf5c9d51ede2a2ac03875ca185e24"
+dependencies = [
+ "tracing",
+ "tracing-subscriber",
+]
+
+[[package]]
+name = "tracing-subscriber"
+version = "0.2.17"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "705096c6f83bf68ea5d357a6aa01829ddbdac531b357b45abeca842938085baa"
+dependencies = [
+ "sharded-slab",
+ "thread_local",
+ "tracing-core",
+]
+
+[[package]]
 name = "unicode-segmentation"
 version = "1.7.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
diff --git a/Cargo.toml b/Cargo.toml
index 6cbf820..4c5ffbf 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -11,9 +11,10 @@ keywords = ["build", "make"]
 categories = ["development-tools"]
 
 [dependencies]
-anyhow = "1.0.40"
 dirs = "3.0.1"
+eyre = "0.6.5"
 glob = "0.3.0"
+jane-eyre = "0.3.0"
 lazy_static = "1.4.0"
 nom = "6.1.2"
 regex = "1.4.5"
diff --git a/src/main.rs b/src/main.rs
index d5a13b2..2948818 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -17,13 +17,14 @@
     clippy::todo
 )]
 #![allow(clippy::non_ascii_literal)]
+#![allow(clippy::missing_docs_in_private_items)]
 
 use std::env::current_dir;
 use std::fs::metadata;
 use std::io::stdin;
 use std::path::PathBuf;
 
-use anyhow::bail;
+use eyre::{bail, Result};
 
 mod args;
 mod makefile;
@@ -31,7 +32,9 @@ mod makefile;
 use args::Args;
 use makefile::Makefile;
 
-fn main() -> anyhow::Result<()> {
+fn main() -> Result<()> {
+    jane_eyre::install()?;
+
     let mut args = Args::from_env_and_args();
     // If no makefile is specified, try some options.
     if args.makefile.is_empty() {
diff --git a/src/makefile/command_line.rs b/src/makefile/command_line.rs
index aaf964a..8756bc9 100644
--- a/src/makefile/command_line.rs
+++ b/src/makefile/command_line.rs
@@ -3,6 +3,8 @@ use std::fmt;
 use std::io;
 use std::process::{Command, ExitStatus};
 
+use eyre::bail;
+
 use crate::makefile::target::Target;
 use crate::makefile::token::{Token, TokenString};
 use crate::makefile::Makefile;
@@ -69,7 +71,7 @@ impl CommandLine {
         }
     }
 
-    pub fn execute(&self, file: &Makefile, target: &Target) -> anyhow::Result<()> {
+    pub fn execute(&self, file: &Makefile, target: &Target) -> eyre::Result<()> {
         let ignore_error = self.ignore_errors
             || file.args.ignore_errors
             || file.special_target_has_prereq(".IGNORE", &target.name);
@@ -94,7 +96,7 @@ impl CommandLine {
         if errored {
             // apparently there was an error. do we care?
             if !ignore_error {
-                anyhow::bail!("error from command execution!");
+                bail!("error from command execution!");
             }
         }
 
diff --git a/src/makefile/conditional.rs b/src/makefile/conditional.rs
index 0b4de01..149638e 100644
--- a/src/makefile/conditional.rs
+++ b/src/makefile/conditional.rs
@@ -1,4 +1,4 @@
-use anyhow::bail;
+use eyre::{bail, Result};
 
 use super::token::TokenString;
 
@@ -83,8 +83,8 @@ fn decode_condition_args(line_body: &str) -> Option<(TokenString, TokenString)>
 impl Line {
     pub fn from(
         line: &str,
-        expand_macro: impl Fn(&TokenString) -> anyhow::Result<String>,
-    ) -> anyhow::Result<Option<Self>> {
+        expand_macro: impl Fn(&TokenString) -> Result<String>,
+    ) -> Result<Option<Self>> {
         Ok(Some(if let Some(line) = line.strip_prefix("ifeq ") {
             match decode_condition_args(line) {
                 Some((arg1, arg2)) => Self::IfEqual(arg1, arg2),
@@ -117,8 +117,8 @@ impl Line {
         &self,
         current_state: Option<&State>,
         is_macro_defined: impl Fn(&str) -> bool,
-        expand_macro: impl Fn(&TokenString) -> anyhow::Result<String>,
-    ) -> anyhow::Result<StateAction> {
+        expand_macro: impl Fn(&TokenString) -> Result<String>,
+    ) -> Result<StateAction> {
         Ok(match self {
             Self::IfEqual(arg1, arg2) => {
                 let arg1 = expand_macro(arg1)?;
diff --git a/src/makefile/functions.rs b/src/makefile/functions.rs
index 97f05b6..a4d206f 100644
--- a/src/makefile/functions.rs
+++ b/src/makefile/functions.rs
@@ -1,8 +1,10 @@
+use eyre::{bail, Result};
+
 use super::pattern::r#match;
 use super::r#macro::{Set as MacroSet, Source as MacroSource};
 use super::token::TokenString;
 
-pub fn expand_call(name: &str, args: &[TokenString], macros: &MacroSet) -> anyhow::Result<String> {
+pub fn expand_call(name: &str, args: &[TokenString], macros: &MacroSet) -> Result<String> {
     match name {
         "filter" => {
             assert_eq!(args.len(), 2);
@@ -53,21 +55,15 @@ pub fn expand_call(name: &str, args: &[TokenString], macros: &MacroSet) -> anyho
         "shell" => todo!(),
 
         // fallback
-        _ => anyhow::bail!("function not implemented: {}", name),
+        _ => bail!("function not implemented: {}", name),
     }
 }
 
 // Text Functions
 mod text {
-    use super::r#match;
-    use super::MacroSet;
-    use super::TokenString;
+    use super::*;
 
-    pub fn filter(
-        macros: &MacroSet,
-        patterns: &TokenString,
-        text: &TokenString,
-    ) -> anyhow::Result<String> {
+    pub fn filter(macros: &MacroSet, patterns: &TokenString, text: &TokenString) -> Result<String> {
         let patterns = macros.expand(patterns)?;
         let patterns = patterns.split_whitespace().collect::<Vec<_>>();
         let text = macros.expand(text)?;
@@ -88,7 +84,7 @@ mod text {
         macros: &MacroSet,
         patterns: &TokenString,
         text: &TokenString,
-    ) -> anyhow::Result<String> {
+    ) -> Result<String> {
         let patterns = macros.expand(patterns)?;
         let patterns = patterns.split_whitespace().collect::<Vec<_>>();
         let text = macros.expand(text)?;
@@ -105,7 +101,7 @@ mod text {
         Ok(result_pieces.join(" "))
     }
 
-    pub fn sort(macros: &MacroSet, words: &TokenString) -> anyhow::Result<String> {
+    pub fn sort(macros: &MacroSet, words: &TokenString) -> Result<String> {
         let words = macros.expand(words)?;
         let mut words = words.split_whitespace().collect::<Vec<_>>();
         words.sort_unstable();
@@ -120,12 +116,11 @@ mod file_name {
     use std::ffi::OsStr;
     use std::path::Path;
 
-    use anyhow::Context;
+    use eyre::WrapErr;
 
-    use super::MacroSet;
-    use super::TokenString;
+    use super::*;
 
-    pub fn notdir(macros: &MacroSet, words: &TokenString) -> anyhow::Result<String> {
+    pub fn notdir(macros: &MacroSet, words: &TokenString) -> Result<String> {
         let words = macros.expand(words)?;
         let words = words
             .split_whitespace()
@@ -139,7 +134,7 @@ mod file_name {
         Ok(words.join(" "))
     }
 
-    pub fn basename(macros: &MacroSet, words: &TokenString) -> anyhow::Result<String> {
+    pub fn basename(macros: &MacroSet, words: &TokenString) -> Result<String> {
         let words = macros.expand(words)?;
         let words = words
             .split_whitespace()
@@ -157,7 +152,7 @@ mod file_name {
         macros: &MacroSet,
         prefix: &TokenString,
         targets: &TokenString,
-    ) -> anyhow::Result<String> {
+    ) -> Result<String> {
         let prefix = macros.expand(prefix)?;
         let targets = macros.expand(targets)?;
         let results = targets
@@ -167,7 +162,7 @@ mod file_name {
         Ok(results.join(" "))
     }
 
-    pub fn wildcard(macros: &MacroSet, pattern: &TokenString) -> anyhow::Result<String> {
+    pub fn wildcard(macros: &MacroSet, pattern: &TokenString) -> Result<String> {
         let pattern = macros.expand(pattern)?;
         let home_dir = env::var("HOME")
             .ok()
@@ -190,16 +185,14 @@ mod file_name {
 
 // foreach
 mod foreach {
-    use super::MacroSet;
-    use super::MacroSource;
-    use super::TokenString;
+    use super::*;
 
     pub fn foreach(
         macros: &MacroSet,
         var: &TokenString,
         list: &TokenString,
         text: &TokenString,
-    ) -> anyhow::Result<String> {
+    ) -> Result<String> {
         let var = macros.expand(var)?;
         let list = macros.expand(list)?;
         let words = list.split_whitespace();
@@ -217,14 +210,12 @@ mod foreach {
 
 // call
 mod call {
-    use super::MacroSet;
-    use super::MacroSource;
-    use super::TokenString;
+    use super::*;
 
     pub fn call<'a>(
         macros: &MacroSet,
         args: impl Iterator<Item = &'a TokenString>,
-    ) -> anyhow::Result<String> {
+    ) -> Result<String> {
         let args = args
             .map(|arg| macros.expand(arg))
             .collect::<Result<Vec<_>, _>>()?;
@@ -244,9 +235,9 @@ mod test {
 
     use crate::makefile::r#macro::{Set as MacroSet, Source as MacroSource};
 
-    type R = anyhow::Result<()>;
+    type R = Result<()>;
 
-    fn call(name: &str, args: &[TokenString], macros: &MacroSet) -> anyhow::Result<String> {
+    fn call(name: &str, args: &[TokenString], macros: &MacroSet) -> Result<String> {
         super::expand_call(name, args, macros)
     }
 
diff --git a/src/makefile/macro.rs b/src/makefile/macro.rs
index f18060f..e760282 100644
--- a/src/makefile/macro.rs
+++ b/src/makefile/macro.rs
@@ -2,7 +2,7 @@ use std::collections::HashMap;
 use std::env;
 use std::fmt;
 
-use anyhow::Context;
+use eyre::{bail, Result, WrapErr};
 use regex::Regex;
 
 use super::functions;
@@ -16,9 +16,9 @@ pub enum Source {
     Builtin,
 }
 
-pub trait LookupInternal: for<'a> Fn(&'a str) -> anyhow::Result<String> {}
+pub trait LookupInternal: for<'a> Fn(&'a str) -> Result<String> {}
 
-impl<F: for<'a> Fn(&'a str) -> anyhow::Result<String>> LookupInternal for F {}
+impl<F: for<'a> Fn(&'a str) -> Result<String>> LookupInternal for F {}
 
 #[derive(Clone)]
 pub struct Set<'parent, 'lookup> {
@@ -51,13 +51,13 @@ impl<'parent, 'lookup> Set<'parent, 'lookup> {
         }
     }
 
-    fn lookup_internal(&self, name: &str) -> anyhow::Result<String> {
+    fn lookup_internal(&self, name: &str) -> Result<String> {
         if let Some(lookup) = self.lookup_internal {
             lookup(name)
         } else if let Some(parent) = self.parent {
             parent.lookup_internal(name)
         } else {
-            anyhow::bail!("no lookup possible")
+            bail!("no lookup possible")
         }
     }
 
@@ -80,7 +80,7 @@ impl<'parent, 'lookup> Set<'parent, 'lookup> {
         self.data.remove(name)
     }
 
-    pub fn expand(&self, text: &TokenString) -> anyhow::Result<String> {
+    pub fn expand(&self, text: &TokenString) -> Result<String> {
         let mut result = String::new();
         for token in text.tokens() {
             match token {
diff --git a/src/makefile/mod.rs b/src/makefile/mod.rs
index 1fb5935..af8ca81 100644
--- a/src/makefile/mod.rs
+++ b/src/makefile/mod.rs
@@ -7,7 +7,7 @@ use std::io::{BufRead, BufReader};
 use std::path::Path;
 use std::rc::Rc;
 
-use anyhow::{bail, Context};
+use eyre::{bail, eyre, Context, Result};
 use lazy_static::lazy_static;
 use regex::Regex;
 
@@ -133,7 +133,7 @@ impl<'a> Makefile<'a> {
         }
     }
 
-    pub fn and_read_file(&mut self, path: impl AsRef<Path>) -> anyhow::Result<()> {
+    pub fn and_read_file(&mut self, path: impl AsRef<Path>) -> Result<()> {
         let file = File::open(path);
         // TODO handle errors
         let file = file.context("couldn't open makefile!")?;
@@ -141,7 +141,7 @@ impl<'a> Makefile<'a> {
         self.and_read(file_reader)
     }
 
-    pub fn and_read(&mut self, source: impl BufRead) -> anyhow::Result<()> {
+    pub fn and_read(&mut self, source: impl BufRead) -> Result<()> {
         let mut lines_iter = source
             .lines()
             .enumerate()
@@ -235,12 +235,12 @@ impl<'a> Makefile<'a> {
         &mut self,
         line_tokens: &TokenString,
         line_number: usize,
-        lines_iter: &mut impl Iterator<Item = (usize, anyhow::Result<String>)>,
-    ) -> anyhow::Result<()> {
+        lines_iter: &mut impl Iterator<Item = (usize, Result<String>)>,
+    ) -> Result<()> {
         let mut lines_iter = lines_iter.peekable();
         let (targets, not_targets) = line_tokens
             .split_once(':')
-            .with_context(|| format!("read_rule couldn't find a ':' on line {}", line_number))?;
+            .ok_or_else(|| eyre!("read_rule couldn't find a ':' on line {}", line_number))?;
         let targets = self.expand_macros(&targets, None)?;
         let targets = targets.split_whitespace().collect::<Vec<_>>();
         let (prerequisites, mut commands) = match not_targets.split_once(';') {
@@ -350,10 +350,10 @@ impl<'a> Makefile<'a> {
         Ok(())
     }
 
-    fn read_macro(&mut self, line_tokens: &TokenString, line_number: usize) -> anyhow::Result<()> {
+    fn read_macro(&mut self, line_tokens: &TokenString, line_number: usize) -> Result<()> {
         let (name, mut value) = line_tokens
             .split_once('=')
-            .with_context(|| format!("read_rule couldn't find a ':' on line {}", line_number))?;
+            .ok_or_else(|| eyre!("read_rule couldn't find a ':' on line {}", line_number))?;
         let name = self.expand_macros(&name, None)?;
         // GNUisms are annoying, but popular
         let mut expand_value = false;
@@ -418,7 +418,7 @@ impl<'a> Makefile<'a> {
         }
     }
 
-    pub fn get_target(&self, name: &str) -> anyhow::Result<Rc<RefCell<Target>>> {
+    pub fn get_target(&self, name: &str) -> Result<Rc<RefCell<Target>>> {
         // TODO implement .POSIX
         let follow_gnu = true;
 
@@ -513,19 +513,23 @@ impl<'a> Makefile<'a> {
         }
 
         let targets = self.targets.borrow();
-        Ok(Rc::clone(targets.get(name).context("Target not found!")?))
+        Ok(Rc::clone(
+            targets
+                .get(name)
+                .ok_or_else(|| eyre!("Target not found!"))?,
+        ))
     }
 
-    pub fn update_target(&self, name: &str) -> anyhow::Result<()> {
+    pub fn update_target(&self, name: &str) -> Result<()> {
         self.get_target(name)?.borrow().update(self)
     }
 
-    fn expand_macros(&self, text: &TokenString, target: Option<&Target>) -> anyhow::Result<String> {
+    fn expand_macros(&self, text: &TokenString, target: Option<&Target>) -> Result<String> {
         let target = target.cloned();
         let lookup_internal = move |name: &str| {
             let target = target
                 .as_ref()
-                .context("internal macro but no current target!")?;
+                .ok_or_else(|| eyre!("internal macro but no current target!"))?;
             let macro_pieces = if name.starts_with('@') {
                 // The $@ shall evaluate to the full target name of the
                 // current target.
@@ -564,7 +568,7 @@ impl<'a> Makefile<'a> {
                     .map(|x| {
                         Path::new(&x)
                             .parent()
-                            .context("no parent")
+                            .ok_or_else(|| eyre!("no parent"))
                             .map(|x| x.to_string_lossy().into())
                     })
                     .collect::<Result<_, _>>()?
@@ -574,7 +578,7 @@ impl<'a> Makefile<'a> {
                     .map(|x| {
                         Path::new(&x)
                             .file_name()
-                            .context("no filename")
+                            .ok_or_else(|| eyre!("no filename"))
                             .map(|x| x.to_string_lossy().into())
                     })
                     .collect::<Result<_, _>>()?
@@ -695,7 +699,7 @@ mod test {
 
     use super::*;
 
-    type R = anyhow::Result<()>;
+    type R = Result<()>;
 
     fn empty_makefile(args: &Args) -> Makefile {
         Makefile {
diff --git a/src/makefile/pattern.rs b/src/makefile/pattern.rs
index 6648851..b47c75d 100644
--- a/src/makefile/pattern.rs
+++ b/src/makefile/pattern.rs
@@ -1,6 +1,7 @@
+use eyre::Result;
 use regex::{Captures, Regex};
 
-fn compile_pattern(pattern: &str) -> anyhow::Result<Regex> {
+fn compile_pattern(pattern: &str) -> Result<Regex> {
     let mut result = String::new();
     for c in pattern.chars() {
         if c == '%' {
@@ -24,7 +25,7 @@ fn compile_pattern(pattern: &str) -> anyhow::Result<Regex> {
     Ok(Regex::new(&result)?)
 }
 
-pub fn r#match<'a>(pattern: &str, text: &'a str) -> anyhow::Result<Option<Captures<'a>>> {
+pub fn r#match<'a>(pattern: &str, text: &'a str) -> Result<Option<Captures<'a>>> {
     Ok(compile_pattern(pattern)?.captures(text))
 }
 
@@ -32,7 +33,7 @@ pub fn r#match<'a>(pattern: &str, text: &'a str) -> anyhow::Result<Option<Captur
 mod test {
     use super::*;
 
-    type R = anyhow::Result<()>;
+    type R = Result<()>;
 
     #[test]
     fn pattern_backslashes() -> R {
diff --git a/src/makefile/target.rs b/src/makefile/target.rs
index 64fdb7d..615c9e9 100644
--- a/src/makefile/target.rs
+++ b/src/makefile/target.rs
@@ -3,6 +3,8 @@ use std::fmt;
 use std::fs::metadata;
 use std::time::SystemTime;
 
+use eyre::Result;
+
 use crate::makefile::command_line::CommandLine;
 
 use super::Makefile;
@@ -50,7 +52,7 @@ impl Target {
         exists && newer_than_all_dependencies
     }
 
-    pub fn update(&self, file: &Makefile) -> anyhow::Result<()> {
+    pub fn update(&self, file: &Makefile) -> Result<()> {
         for prereq in &self.prerequisites {
             file.update_target(prereq)?;
         }
@@ -62,7 +64,7 @@ impl Target {
         Ok(())
     }
 
-    fn execute_commands(&self, file: &Makefile) -> anyhow::Result<()> {
+    fn execute_commands(&self, file: &Makefile) -> Result<()> {
         for command in &self.commands {
             command.execute(file, self)?;
         }
diff --git a/src/makefile/token.rs b/src/makefile/token.rs
index 16403ff..076ac60 100644
--- a/src/makefile/token.rs
+++ b/src/makefile/token.rs
@@ -1,7 +1,7 @@
 use std::fmt;
 use std::str::FromStr;
 
-use anyhow::Context;
+use eyre::WrapErr;
 use nom::{
     branch::alt,
     bytes::complete::{tag, take_till1, take_while1},
@@ -252,16 +252,16 @@ fn full_text_tokens(input: &str) -> IResult<&str, TokenString> {
     all_consuming(tokens_but_not(vec![]))(input)
 }
 
-pub fn tokenize(input: &str) -> anyhow::Result<TokenString> {
+pub fn tokenize(input: &str) -> eyre::Result<TokenString> {
     let (_, result) = full_text_tokens(input)
         .finish()
-        .map_err(|err| anyhow::anyhow!(err.to_string()))
+        .map_err(|err| eyre::eyre!(err.to_string()))
         .with_context(|| format!("couldn't parse {:?}", input))?;
     Ok(result)
 }
 
 impl FromStr for TokenString {
-    type Err = anyhow::Error;
+    type Err = eyre::Error;
 
     fn from_str(s: &str) -> Result<Self, Self::Err> {
         tokenize(s)