Try switching to thiserror for the library part

.github/workflows/ci.yml

@@ -4,7 +4,6 @@ on:
   push:
     branches: [ "main" ]
   pull_request:
-    branches: [ "main" ]
 
 env:
   CARGO_TERM_COLOR: always

Cargo.toml

@@ -12,7 +12,15 @@ categories = ["command-line-utilities"]
 exclude = ["/tools/"]
 
 [features]
-bin = ["dep:clap", "dep:clap_complete", "dep:ctrlc", "dep:shadow-rs", "dep:sysinfo", "dep:winresource"]
+bin = [
+    "dep:anyhow",
+    "dep:clap",
+    "dep:clap_complete",
+    "dep:ctrlc",
+    "dep:shadow-rs",
+    "dep:sysinfo",
+    "dep:winresource"
+]
 capi = []
 
 [profile.release]
@@ -24,14 +32,15 @@ name = "keepawake"
 required-features = ["bin"]
 
 [dependencies]
-anyhow = "1.0.65"
+anyhow = { version = "1.0.65", optional = true }
 cfg-if = "1.0.0"
 clap = { version = "4.0.2", features = ["derive"], optional = true }
 clap_complete = { version = "4.0.2", optional = true }
 ctrlc = { version = "3.2.3", features = ["termination"], optional = true }
 derive_builder = "0.12.0"
 shadow-rs = { version = "0.26.1", optional = true }
 sysinfo = { version = "0.30.5", optional = true }
+thiserror = "1.0.56"
 
 [target.'cfg(windows)'.dependencies.windows]
 version = "0.52.0"

src/lib.rs

@@ -3,7 +3,7 @@
 //! # Examples
 //!
 //! ```
-//! # fn try_main() -> anyhow::Result<()> {
+//! # fn try_main() -> Result<(), keepawake::Error> {
 //! let _awake = keepawake::Builder::default()
 //!     .display(true)
 //!     .reason("Video playback")
@@ -16,7 +16,7 @@
 //! ```
 //!
 //! ```
-//! # fn try_main() -> anyhow::Result<()> {
+//! # fn try_main() -> Result<(), keepawake::Error> {
 //! let _awake = keepawake::Builder::default()
 //!     .display(true)
 //!     .idle(true)
@@ -27,14 +27,25 @@
 //! # try_main();
 //! ```
 
-use anyhow::Result;
+use std::error;
+
 use derive_builder::Builder;
+use thiserror::Error;
 
 mod sys;
 
 #[cfg(feature = "capi")]
 pub mod capi;
 
+#[derive(Error, Debug)]
+pub enum Error {
+    #[error("builder: {0}")]
+    Builder(#[from] BuilderError),
+
+    #[error("system: {0}")]
+    System(#[from] Box<dyn error::Error + Send + Sync>),
+}
+
 #[derive(Builder, Debug)]
 #[builder(public, name = "Builder", build_fn(private))]
 #[allow(dead_code)] // Some fields are unused on some platforms
@@ -70,7 +81,7 @@ struct Options {
 
 impl Builder {
     /// Create the [`KeepAwake`].
-    pub fn create(&self) -> Result<KeepAwake> {
+    pub fn create(&self) -> Result<KeepAwake, Error> {
         Ok(KeepAwake {
             _imp: sys::KeepAwake::new(self.build()?)?,
         })

src/sys/linux.rs

@@ -7,7 +7,8 @@
 //! [ScreenSaver]: https://people.freedesktop.org/~hadess/idle-inhibition-spec/re01.html
 //! [systemd Inhibitor Locks]:(https://www.freedesktop.org/wiki/Software/systemd/inhibit/
 
-use anyhow::Result;
+use std::error;
+
 use zbus::{blocking::Connection, dbus_proxy};
 
 use crate::Options;
@@ -51,7 +52,7 @@ pub struct KeepAwake {
 }
 
 impl KeepAwake {
-    pub fn new(options: Options) -> Result<Self> {
+    pub fn new(options: Options) -> Result<Self, Box<dyn error::Error + Send + Sync>> {
         let mut awake = Self {
             options,
 

src/sys/macos.rs

@@ -4,7 +4,8 @@
 //!
 //! [`IOPMAssertionCreateWithName`]: https://developer.apple.com/documentation/iokit/1557134-iopmassertioncreatewithname
 
-use anyhow::{anyhow, Result};
+use std::error;
+
 use apple_sys::IOKit::{
     kIOPMAssertionLevelOn, kIOReturnSuccess, CFStringRef, IOPMAssertionCreateWithName,
     IOPMAssertionRelease,
@@ -31,7 +32,7 @@ pub struct KeepAwake {
 }
 
 impl KeepAwake {
-    pub fn new(options: Options) -> Result<Self> {
+    pub fn new(options: Options) -> Result<Self, Box<dyn error::Error + Send + Sync>> {
         let mut awake = Self {
             options,
             display_assertion: 0,
@@ -42,7 +43,7 @@ impl KeepAwake {
         Ok(awake)
     }
 
-    fn set(&mut self) -> Result<()> {
+    fn set(&mut self) -> Result<(), Box<dyn error::Error + Send + Sync>> {
         if self.options.display {
             unsafe {
                 let result = IOPMAssertionCreateWithName(
@@ -55,7 +56,7 @@ impl KeepAwake {
                 );
                 if result != kIOReturnSuccess as i32 {
                     // TODO Better error?
-                    return Err(anyhow!("IO error: {:#x}", result));
+                    return Err(format!("IO error: {:#x}", result).into());
                 }
             }
         }
@@ -70,7 +71,7 @@ impl KeepAwake {
                     &mut self.idle_assertion,
                 );
                 if result != kIOReturnSuccess as i32 {
-                    return Err(anyhow!("IO error: {:#x}", result));
+                    return Err(format!("IO error: {:#x}", result).into());
                 }
             }
         }
@@ -85,7 +86,7 @@ impl KeepAwake {
                     &mut self.sleep_assertion,
                 );
                 if result != kIOReturnSuccess as i32 {
-                    return Err(anyhow!("IO error: {:#x}", result));
+                    return Err(format!("IO error: {:#x}", result).into());
                 }
             }
         }

src/sys/windows.rs

@@ -7,7 +7,8 @@
 //! [`SetThreadExecutionState`]: https://learn.microsoft.com/en-us/windows/win32/api/winbase/nf-winbase-setthreadexecutionstate
 //! [`PowerSetRequest`]: https://learn.microsoft.com/en-us/windows/win32/api/winbase/nf-winbase-powersetrequest
 
-use anyhow::Result;
+use std::error;
+
 use windows::core::Error as WindowsError;
 use windows::Win32::System::Power::{
     SetThreadExecutionState, ES_AWAYMODE_REQUIRED, ES_CONTINUOUS, ES_DISPLAY_REQUIRED,
@@ -22,7 +23,7 @@ pub struct KeepAwake {
 }
 
 impl KeepAwake {
-    pub fn new(options: Options) -> Result<Self> {
+    pub fn new(options: Options) -> Result<Self, Box<dyn error::Error + Send + Sync>> {
         let mut awake = KeepAwake {
             options,
             previous: Default::default(),