rhg: use `format_bytes!` for error messages

This change also includes a formatting changing with the new `rustfmt` version,
but I'm expecting it to have already been applied in another patch by the time
this lands.

Differential Revision: https://phab.mercurial-scm.org/D9407

rust/Cargo.lock

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rust/rhg/Cargo.toml

@@ -1,12 +1,16 b''
 [package]
 name = "rhg"
 version = "0.1.0"
-authors = ["Antoine Cezar <[e-mail]>"]
+authors = [
+    "Antoine Cezar <[e-mail]>",
+    "Raphaël Gomès <[e-mail]>",
+]
 edition = "2018"
 
 [dependencies]
 hg-core = { path = "../hg-core"}
 clap = "2.33.1"
 log = "0.4.11"
 micro-timer = "0.3.1"
 env_logger = "0.7.1"
+format-bytes = "0.1.3"

rust/rhg/src/commands/root.rs

@@ -1,32 +1,32 b''
 use crate::commands::Command;
 use crate::error::CommandError;
 use crate::ui::Ui;
+use format_bytes::format_bytes;
 use hg::operations::FindRoot;
 use hg::utils::files::get_bytes_from_path;
 
 pub const HELP_TEXT: &str = "
 Print the root directory of the current repository.
 
 Returns 0 on success.
 ";
 
 pub struct RootCommand {}
 
 impl RootCommand {
     pub fn new() -> Self {
         RootCommand {}
     }
 }
 
 impl Command for RootCommand {
     fn run(&self, ui: &Ui) -> Result<(), CommandError> {
         let path_buf = FindRoot::new().run()?;
 
         let bytes = get_bytes_from_path(path_buf);
 
-        // TODO use formating macro
-        ui.write_stdout(&[bytes.as_slice(), b"\n"].concat())?;
+        ui.write_stdout(&format_bytes!(b"{}\n", bytes.as_slice()))?;
 
         Ok(())
     }
 }

rust/rhg/src/error.rs

@@ -1,133 +1,124 b''
 use crate::exitcode;
 use crate::ui::UiError;
+use format_bytes::format_bytes;
 use hg::operations::{FindRootError, FindRootErrorKind};
 use hg::requirements::RequirementsError;
 use hg::utils::files::get_bytes_from_path;
 use std::convert::From;
 use std::path::PathBuf;
 
 /// The kind of command error
 #[derive(Debug)]
 pub enum CommandErrorKind {
     /// The root of the repository cannot be found
     RootNotFound(PathBuf),
     /// The current directory cannot be found
     CurrentDirNotFound(std::io::Error),
     /// `.hg/requires`
     RequirementsError(RequirementsError),
     /// The standard output stream cannot be written to
     StdoutError,
     /// The standard error stream cannot be written to
     StderrError,
     /// The command aborted
     Abort(Option<Vec<u8>>),
     /// A mercurial capability as not been implemented.
     Unimplemented,
 }
 
 impl CommandErrorKind {
     pub fn get_exit_code(&self) -> exitcode::ExitCode {
         match self {
             CommandErrorKind::RootNotFound(_) => exitcode::ABORT,
             CommandErrorKind::CurrentDirNotFound(_) => exitcode::ABORT,
             CommandErrorKind::RequirementsError(
                 RequirementsError::Unsupported { .. },
             ) => exitcode::UNIMPLEMENTED_COMMAND,
             CommandErrorKind::RequirementsError(_) => exitcode::ABORT,
             CommandErrorKind::StdoutError => exitcode::ABORT,
             CommandErrorKind::StderrError => exitcode::ABORT,
             CommandErrorKind::Abort(_) => exitcode::ABORT,
             CommandErrorKind::Unimplemented => exitcode::UNIMPLEMENTED_COMMAND,
         }
     }
 
     /// Return the message corresponding to the error kind if any
     pub fn get_error_message_bytes(&self) -> Option<Vec<u8>> {
         match self {
-            // TODO use formating macro
             CommandErrorKind::RootNotFound(path) => {
                 let bytes = get_bytes_from_path(path);
-                Some(
-                    [
-                        b"abort: no repository found in '",
-                        bytes.as_slice(),
-                        b"' (.hg not found)!\n",
-                    ]
-                    .concat(),
-                )
+                Some(format_bytes!(
+                    b"abort: no repository found in '{}' (.hg not found)!\n",
+                    bytes.as_slice()
+                ))
             }
-            // TODO use formating macro
-            CommandErrorKind::CurrentDirNotFound(e) => Some(
-                [
-                    b"abort: error getting current working directory: ",
-                    e.to_string().as_bytes(),
-                    b"\n",
-                ]
-                .concat(),
-            ),
+            CommandErrorKind::CurrentDirNotFound(e) => Some(format_bytes!(
+                b"abort: error getting current working directory: {}\n",
+                e.to_string().as_bytes(),
+            )),
             CommandErrorKind::RequirementsError(
                 RequirementsError::Corrupted,
             ) => Some(
                 "abort: .hg/requires is corrupted\n".as_bytes().to_owned(),
             ),
             CommandErrorKind::Abort(message) => message.to_owned(),
             _ => None,
         }
     }
 }
 
 /// The error type for the Command trait
 #[derive(Debug)]
 pub struct CommandError {
     pub kind: CommandErrorKind,
 }
 
 impl CommandError {
     /// Exist the process with the corresponding exit code.
     pub fn exit(&self) {
         std::process::exit(self.kind.get_exit_code())
     }
 
     /// Return the message corresponding to the command error if any
     pub fn get_error_message_bytes(&self) -> Option<Vec<u8>> {
         self.kind.get_error_message_bytes()
     }
 }
 
 impl From<CommandErrorKind> for CommandError {
     fn from(kind: CommandErrorKind) -> Self {
         CommandError { kind }
     }
 }
 
 impl From<UiError> for CommandError {
     fn from(error: UiError) -> Self {
         CommandError {
             kind: match error {
                 UiError::StdoutError(_) => CommandErrorKind::StdoutError,
                 UiError::StderrError(_) => CommandErrorKind::StderrError,
             },
         }
     }
 }
 
 impl From<FindRootError> for CommandError {
     fn from(err: FindRootError) -> Self {
         match err.kind {
             FindRootErrorKind::RootNotFound(path) => CommandError {
                 kind: CommandErrorKind::RootNotFound(path),
             },
             FindRootErrorKind::GetCurrentDirError(e) => CommandError {
                 kind: CommandErrorKind::CurrentDirNotFound(e),
             },
         }
     }
 }
 
 impl From<RequirementsError> for CommandError {
     fn from(err: RequirementsError) -> Self {
         CommandError {
             kind: CommandErrorKind::RequirementsError(err),
         }
     }
 }

rust/rhg/src/ui.rs

@@ -1,113 +1,117 b''
+use format_bytes::format_bytes;
 use std::borrow::Cow;
 use std::io;
 use std::io::{ErrorKind, Write};
 
 #[derive(Debug)]
 pub struct Ui {
     stdout: std::io::Stdout,
     stderr: std::io::Stderr,
 }
 
 /// The kind of user interface error
 pub enum UiError {
     /// The standard output stream cannot be written to
     StdoutError(io::Error),
     /// The standard error stream cannot be written to
     StderrError(io::Error),
 }
 
 /// The commandline user interface
 impl Ui {
     pub fn new() -> Self {
         Ui {
             stdout: std::io::stdout(),
             stderr: std::io::stderr(),
         }
     }
 
     /// Returns a buffered handle on stdout for faster batch printing
     /// operations.
     pub fn stdout_buffer(&self) -> StdoutBuffer<std::io::StdoutLock> {
         StdoutBuffer::new(self.stdout.lock())
     }
 
     /// Write bytes to stdout
     pub fn write_stdout(&self, bytes: &[u8]) -> Result<(), UiError> {
         let mut stdout = self.stdout.lock();
 
         stdout.write_all(bytes).or_else(handle_stdout_error)?;
 
         stdout.flush().or_else(handle_stdout_error)
     }
 
     /// Write bytes to stderr
     pub fn write_stderr(&self, bytes: &[u8]) -> Result<(), UiError> {
         let mut stderr = self.stderr.lock();
 
         stderr.write_all(bytes).or_else(handle_stderr_error)?;
 
         stderr.flush().or_else(handle_stderr_error)
     }
 
     /// Write string line to stderr
     pub fn writeln_stderr_str(&self, s: &str) -> Result<(), UiError> {
         self.write_stderr(&format!("{}\n", s).as_bytes())
     }
 }
 
 /// A buffered stdout writer for faster batch printing operations.
 pub struct StdoutBuffer<W: Write> {
     buf: io::BufWriter<W>,
 }
 
 impl<W: Write> StdoutBuffer<W> {
     pub fn new(writer: W) -> Self {
         let buf = io::BufWriter::new(writer);
         Self { buf }
     }
 
     /// Write bytes to stdout buffer
     pub fn write_all(&mut self, bytes: &[u8]) -> Result<(), UiError> {
         self.buf.write_all(bytes).or_else(handle_stdout_error)
     }
 
     /// Flush bytes to stdout
     pub fn flush(&mut self) -> Result<(), UiError> {
         self.buf.flush().or_else(handle_stdout_error)
     }
 }
 
 /// Sometimes writing to stdout is not possible, try writing to stderr to
 /// signal that failure, otherwise just bail.
 fn handle_stdout_error(error: io::Error) -> Result<(), UiError> {
     if let ErrorKind::BrokenPipe = error.kind() {
         // This makes `| head` work for example
         return Ok(());
     }
     let mut stderr = io::stderr();
 
     stderr
-        .write_all(&[b"abort: ", error.to_string().as_bytes(), b"\n"].concat())
+        .write_all(&format_bytes!(
+            b"abort: {}\n",
+            error.to_string().as_bytes()
+        ))
         .map_err(UiError::StderrError)?;
 
     stderr.flush().map_err(UiError::StderrError)?;
 
     Err(UiError::StdoutError(error))
 }
 
 /// Sometimes writing to stderr is not possible.
 fn handle_stderr_error(error: io::Error) -> Result<(), UiError> {
     // A broken pipe should not result in a error
     // like with `| head` for example
     if let ErrorKind::BrokenPipe = error.kind() {
         return Ok(());
     }
     Err(UiError::StdoutError(error))
 }
 
 /// Encode rust strings according to the user system.
 pub fn utf8_to_local(s: &str) -> Cow<[u8]> {
     // TODO encode for the user's system //
     let bytes = s.as_bytes();
     Cow::Borrowed(bytes)
 }