deprecate --backup option (#3902)

Configurations.md

@@ -2442,10 +2442,6 @@ Break comments to fit on the line
 
 Internal option
 
-## `make_backup`
-
-Internal option, use `--backup`
-
 ## `print_misformatted_file_names`
 
 Internal option, use `-l` or `--files-with-diff`

src/bin/main.rs

@@ -110,7 +110,6 @@ fn make_opts() -> Options {
         "[files|stdout]"
     };
     opts.optopt("", "emit", "What data to emit and how", emit_opts);
-    opts.optflag("", "backup", "Backup any modified files.");
     opts.optopt(
         "",
         "config-path",
@@ -506,7 +505,6 @@ struct GetOptsOptions {
     config_path: Option<PathBuf>,
     inline_config: HashMap<String, String>,
     emit_mode: Option<EmitMode>,
-    backup: bool,
     check: bool,
     edition: Option<Edition>,
     color: Option<Color>,
@@ -608,10 +606,6 @@ impl GetOptsOptions {
             options.edition = Some(edition_from_edition_str(edition_str)?);
         }
 
-        if matches.opt_present("backup") {
-            options.backup = true;
-        }
-
         if matches.opt_present("files-with-diff") {
             options.print_misformatted_file_names = true;
         }
@@ -675,9 +669,6 @@ impl CliOptions for GetOptsOptions {
         } else if let Some(emit_mode) = self.emit_mode {
             config.set().emit_mode(emit_mode);
         }
-        if self.backup {
-            config.set().make_backup(true);
-        }
         if let Some(color) = self.color {
             config.set().color(color);
         }

src/config/mod.rs

@@ -151,7 +151,6 @@ create_config! {
         "'small' heuristic values";
     emit_mode: EmitMode, EmitMode::Files, false,
         "What emit Mode to use when none is supplied";
-    make_backup: bool, false, false, "Backup changed files";
     print_misformatted_file_names: bool, false, true,
         "Prints the names of mismatched files that were formatted. Prints the names of \
          files that would be formated when used with `--check` mode. ";
@@ -552,7 +551,6 @@ report_todo = "Never"
 report_fixme = "Never"
 ignore = []
 emit_mode = "Files"
-make_backup = false
 "#,
             env!("CARGO_PKG_VERSION")
         );

src/emitter.rs

@@ -1,7 +1,6 @@
 pub(crate) use self::checkstyle::*;
 pub(crate) use self::diff::*;
 pub(crate) use self::files::*;
-pub(crate) use self::files_with_backup::*;
 pub(crate) use self::json::*;
 pub(crate) use self::modified_lines::*;
 pub(crate) use self::stdout::*;
@@ -12,7 +11,6 @@ use std::path::Path;
 mod checkstyle;
 mod diff;
 mod files;
-mod files_with_backup;
 mod json;
 mod modified_lines;
 mod stdout;

src/lib.rs

@@ -476,9 +476,6 @@ impl<'b, T: Write + 'b> Session<'b, T> {
 
 pub(crate) fn create_emitter<'a>(config: &Config) -> Box<dyn Emitter + 'a> {
     match config.emit_mode() {
-        EmitMode::Files if config.make_backup() => {
-            Box::new(emitter::FilesWithBackupEmitter::default())
-        }
         EmitMode::Files => Box::new(emitter::FilesEmitter::new(
             config.print_misformatted_file_names(),
         )),