Fix using --help, --verbose, etc.

Author: ehuss

src/cargo-fmt/main.rs

@@ -142,10 +142,11 @@ fn format_crate(
     strategy: &CargoFmtStrategy,
     rustfmt_args: Vec<String>,
 ) -> Result<i32, io::Error> {
-    let targets = if rustfmt_args
-        .iter()
-        .any(|s| ["--print-config", "-h", "--help", "-V", "--version"].contains(&s.as_str()))
-    {
+    let targets = if rustfmt_args.iter().any(|s| {
+        ["--print-config", "-h", "--help", "-V", "--version"].contains(&s.as_str())
+            || s.starts_with("--help=")
+            || s.starts_with("--print-config=")
+    }) {
         BTreeSet::new()
     } else {
         get_targets(strategy)?
@@ -333,7 +334,7 @@ fn run_rustfmt(
     fmt_args: &[String],
     verbosity: Verbosity,
 ) -> Result<i32, io::Error> {
-    let by_edition = targets
+    let mut by_edition = targets
         .iter()
         .inspect(|t| {
             if verbosity == Verbosity::Verbose {
@@ -345,6 +346,11 @@ fn run_rustfmt(
             h
         });
 
+    let s = "2018".to_string();
+    if by_edition.is_empty() {
+        by_edition.insert(&s, vec![]);
+    }
+
     let mut status = vec![];
     for (edition, files) in by_edition {
         let stdout = if verbosity == Verbosity::Quiet {