Use failure instead of error chain

Cargo.lock

@@ -38,14 +38,6 @@ name = "cfg-if"
 version = "0.1.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
-[[package]]
-name = "error-chain"
-version = "0.11.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-dependencies = [
- "backtrace 0.3.8 (registry+https://github.com/rust-lang/crates.io-index)",
-]
-
 [[package]]
 name = "failure"
 version = "0.1.1"
@@ -189,7 +181,8 @@ dependencies = [
 name = "topgrade"
 version = "0.2.0"
 dependencies = [
- "error-chain 0.11.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "failure 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "failure_derive 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "os_type 2.0.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "termion 1.5.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "which 2.0.0 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -257,7 +250,6 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 "checksum backtrace-sys 0.1.22 (registry+https://github.com/rust-lang/crates.io-index)" = "5fd343a2466c4603f76f38de264bc0526cffc7fa38ba52fb9f13237eccc1ced2"
 "checksum cc 1.0.17 (registry+https://github.com/rust-lang/crates.io-index)" = "49ec142f5768efb5b7622aebc3fdbdbb8950a4b9ba996393cb76ef7466e8747d"
 "checksum cfg-if 0.1.3 (registry+https://github.com/rust-lang/crates.io-index)" = "405216fd8fe65f718daa7102ea808a946b6ce40c742998fbfd3463645552de18"
-"checksum error-chain 0.11.0 (registry+https://github.com/rust-lang/crates.io-index)" = "ff511d5dc435d703f4971bc399647c9bc38e20cb41452e3b9feb4765419ed3f3"
 "checksum failure 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)" = "934799b6c1de475a012a02dab0ace1ace43789ee4b99bcfbf1a2e3e8ced5de82"
 "checksum failure_derive 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)" = "c7cdda555bb90c9bb67a3b670a0f42de8e73f5981524123ad8578aafec8ddb8b"
 "checksum lazy_static 1.0.1 (registry+https://github.com/rust-lang/crates.io-index)" = "e6412c5e2ad9584b0b8e979393122026cdd6d2a80b933f890dcd694ddbe73739"

Cargo.toml

@@ -9,6 +9,7 @@ exclude = ["doc/screenshot.gif"]
 
 [dependencies]
 which = "2.0.0"
-error-chain = "0.11.0"
 os_type = "2.0.0"
 termion = "1.5.1"
+failure = "0.1.1"
+failure_derive = "0.1.1"

src/git.rs

@@ -1,4 +1,4 @@
-use super::error::*;
+use failure::Error;
 use std::path::{Path, PathBuf};
 use std::process::Command;
 use which::which;
@@ -38,7 +38,7 @@ impl Git {
         None
     }
 
-    pub fn pull<P: AsRef<Path>>(&self, path: P) -> Result<()> {
+    pub fn pull<P: AsRef<Path>>(&self, path: P) -> Result<(), Error> {
         if let Some(git) = &self.git {
             if let Ok(mut command) = Command::new(&git)
                 .arg("pull")

src/main.rs

@@ -1,28 +1,14 @@
+extern crate failure;
 extern crate os_type;
 extern crate which;
 #[macro_use]
-extern crate error_chain;
+extern crate failure_derive;
 extern crate termion;
 
-mod error {
-    error_chain!{
-        foreign_links {
-            Io(::std::io::Error);
-        }
-
-        errors {
-            ProcessFailed {
-                description("Process failed")
-                    display("Process failed")
-            }
-        }
-    }
-}
-
 mod git;
 mod terminal;
 
-use error::*;
+use failure::Error;
 use git::Git;
 use os_type::OSType;
 use std::collections::HashSet;
@@ -32,16 +18,20 @@ use std::process::{Command, ExitStatus};
 use terminal::Terminal;
 use which::which;
 
+#[derive(Fail, Debug)]
+#[fail(display = "Process failed")]
+struct ProcessFailed;
+
 trait Check {
-    fn check(self) -> Result<()>;
+    fn check(self) -> Result<(), Error>;
 }
 
 impl Check for ExitStatus {
-    fn check(self) -> Result<()> {
+    fn check(self) -> Result<(), Error> {
         if self.success() {
             Ok(())
         } else {
-            Err(ErrorKind::ProcessFailed.into())
+            Err(Error::from(ProcessFailed {}))
         }
     }
 }
@@ -68,7 +58,7 @@ fn tpm() -> Option<PathBuf> {
     }
 }
 
-fn run() -> Result<()> {
+fn main() -> Result<(), Error> {
     let git = Git::new();
     let mut git_repos: HashSet<String> = HashSet::new();
     let terminal = Terminal::new();
@@ -177,7 +167,7 @@ fn run() -> Result<()> {
                                 .args(&["apt", "dist-upgrade"])
                                 .spawn()?
                                 .wait()
-                                .map_err(|e| e.into())
+                                .map_err(Error::from)
                         })?;
                 }
             }
@@ -203,7 +193,7 @@ fn run() -> Result<()> {
                         .arg("get-updates")
                         .spawn()?
                         .wait()
-                        .map_err(|e| e.into())
+                        .map_err(Error::from)
                 })?;
         }
 
@@ -228,7 +218,7 @@ fn run() -> Result<()> {
                         .arg("upgrade")
                         .spawn()?
                         .wait()
-                        .map_err(|e| e.into())
+                        .map_err(Error::from)
                 })?;
         }
 
@@ -241,5 +231,3 @@ fn run() -> Result<()> {
 
     Ok(())
 }
-
-quick_main!(run);