Merge #1409

1409: The Fall down of failures r=matklad a=mominul

:grin:
Replaced all the uses of `failure` crate with `std::error::Error`.

Closes #1400 
Depends on rust-analyzer/teraron#1

Co-authored-by: Muhammad Mominul Huque <[email protected]>

Author: bors[bot]

Cargo.lock

@@ -6,8 +6,7 @@ authors = ["rust-analyzer developers"]
 publish = false
 
 [dependencies]
-teraron = "0.0.1"
+teraron = "0.1.0"
 walkdir = "2.1.3"
 itertools = "0.8.0"
 clap = "2.32.0"
-failure = "0.1.4"

crates/ra_tools/Cargo.toml

@@ -1,7 +1,5 @@
 use std::process::Command;
 
-use failure::bail;
-
 use ra_tools::{Result, run_rustfmt, run, project_root, Overwrite};
 
 fn main() -> Result<()> {
@@ -19,7 +17,10 @@ fn update_staged() -> Result<()> {
         .current_dir(&root)
         .output()?;
     if !output.status.success() {
-        bail!("`git diff --diff-filter=MAR --name-only --cached` exited with {}", output.status);
+        Err(format!(
+            "`git diff --diff-filter=MAR --name-only --cached` exited with {}",
+            output.status
+        ))?;
     }
     for line in String::from_utf8(output.stdout)?.lines() {
         run(&format!("git update-index --add {}", root.join(line).to_string_lossy()), ".")?;

crates/ra_tools/src/bin/pre-commit.rs

@@ -3,15 +3,15 @@ use std::{
     collections::HashMap,
     path::{Path, PathBuf},
     process::{Command, Output, Stdio},
-    io::{Error, ErrorKind}
+    io::{Error as IoError, ErrorKind},
+    error::Error
 };
 
-use failure::bail;
 use itertools::Itertools;
 
 pub use teraron::{Mode, Overwrite, Verify};
 
-pub type Result<T> = std::result::Result<T, failure::Error>;
+pub type Result<T> = std::result::Result<T, Box<dyn Error>>;
 
 pub const GRAMMAR: &str = "crates/ra_syntax/src/grammar.ron";
 const GRAMMAR_DIR: &str = "crates/ra_parser/src/grammar";
@@ -128,7 +128,7 @@ pub fn install_format_hook() -> Result<()> {
             fs::copy("./target/debug/pre-commit", result_path)?;
         }
     } else {
-        return Err(Error::new(ErrorKind::AlreadyExists, "Git hook already created").into());
+        Err(IoError::new(ErrorKind::AlreadyExists, "Git hook already created"))?;
     }
     Ok(())
 }
@@ -224,7 +224,7 @@ where
     f(cmd.args(args).current_dir(proj_dir).stderr(Stdio::inherit()));
     let output = cmd.output()?;
     if !output.status.success() {
-        bail!("`{}` exited with {}", cmdline, output.status);
+        Err(format!("`{}` exited with {}", cmdline, output.status))?;
     }
     Ok(output)
 }
@@ -256,11 +256,11 @@ fn tests_from_dir(dir: &Path) -> Result<Tests> {
         for (_, test) in collect_tests(&text) {
             if test.ok {
                 if let Some(old_test) = res.ok.insert(test.name.clone(), test) {
-                    bail!("Duplicate test: {}", old_test.name)
+                    Err(format!("Duplicate test: {}", old_test.name))?
                 }
             } else {
                 if let Some(old_test) = res.err.insert(test.name.clone(), test) {
-                    bail!("Duplicate test: {}", old_test.name)
+                    Err(format!("Duplicate test: {}", old_test.name))?
                 }
             }
         }

crates/ra_tools/src/lib.rs

@@ -1,6 +1,5 @@
 use clap::{App, SubCommand};
 use core::str;
-use failure::bail;
 use ra_tools::{
     generate, gen_tests, install_format_hook, run, run_with_output, run_rustfmt,
     Overwrite, Result, run_fuzzer, run_clippy,
@@ -64,10 +63,8 @@ fn verify_installed_extensions() -> Result<()> {
         run_with_output(r"code --list-extensions", ".")?
     };
     if !str::from_utf8(&exts.stdout)?.contains("ra-lsp") {
-        bail!(
-            "Could not install the Visual Studio Code extension. Please make sure you \
-             have at least NodeJS 10.x installed and try again."
-        );
+        Err("Could not install the Visual Studio Code extension. Please make sure you \
+             have at least NodeJS 10.x installed and try again.")?;
     }
     Ok(())
 }
@@ -79,7 +76,7 @@ fn fix_path_for_mac() -> Result<()> {
         const ROOT_DIR: &str = "";
         let home_dir = match env::var("HOME") {
             Ok(home) => home,
-            Err(e) => bail!("Failed getting HOME from environment with error: {}.", e),
+            Err(e) => Err(format!("Failed getting HOME from environment with error: {}.", e))?,
         };
 
         [ROOT_DIR, &home_dir]
@@ -93,7 +90,7 @@ fn fix_path_for_mac() -> Result<()> {
     if !vscode_path.is_empty() {
         let vars = match env::var_os("PATH") {
             Some(path) => path,
-            None => bail!("Could not get PATH variable from env."),
+            None => Err("Could not get PATH variable from env.")?,
         };
 
         let mut paths = env::split_paths(&vars).collect::<Vec<_>>();