style: rustfmt everything

This is why I was so intent on clearing the PR queue. This will
effectively invalidate all existing patches, so I wanted to start from a
clean slate.

We do make one little tweak: we put the default type definitions in
their own file and tell rustfmt to keep its grubby mits off of it. We
also sort it lexicographically and hopefully will enforce that from here
on.

build.rs

@@ -21,7 +21,8 @@ fn main() {
             eprintln!(
                 "OUT_DIR environment variable not defined. \
                  Please file a bug: \
-                 https://github.com/BurntSushi/ripgrep/issues/new");
+                 https://github.com/BurntSushi/ripgrep/issues/new"
+            );
             process::exit(1);
         }
     };
@@ -90,8 +91,10 @@ fn generate_man_page<P: AsRef<Path>>(outdir: P) -> io::Result<()> {
     File::create(&txt_path)?.write_all(tpl.as_bytes())?;
     let result = process::Command::new("a2x")
         .arg("--no-xmllint")
-        .arg("--doctype").arg("manpage")
-        .arg("--format").arg("manpage")
+        .arg("--doctype")
+        .arg("manpage")
+        .arg("--format")
+        .arg("manpage")
         .arg(&txt_path)
         .spawn()?
         .wait()?;
@@ -114,7 +117,7 @@ fn formatted_options() -> io::Result<String> {
         // ripgrep only has two positional arguments, and probably will only
         // ever have two positional arguments, so we just hardcode them into
         // the template.
-        if let app::RGArgKind::Positional{..} = arg.kind {
+        if let app::RGArgKind::Positional { .. } = arg.kind {
             continue;
         }
         formatted.push(formatted_arg(&arg)?);
@@ -124,7 +127,9 @@ fn formatted_options() -> io::Result<String> {
 
 fn formatted_arg(arg: &RGArg) -> io::Result<String> {
     match arg.kind {
-        RGArgKind::Positional{..} => panic!("unexpected positional argument"),
+        RGArgKind::Positional { .. } => {
+            panic!("unexpected positional argument")
+        }
         RGArgKind::Switch { long, short, multiple } => {
             let mut out = vec![];
 
@@ -163,7 +168,8 @@ fn formatted_arg(arg: &RGArg) -> io::Result<String> {
 }
 
 fn formatted_doc_txt(arg: &RGArg) -> io::Result<String> {
-    let paragraphs: Vec<String> = arg.doc_long
+    let paragraphs: Vec<String> = arg
+        .doc_long
         .replace("{", "&#123;")
         .replace("}", r"&#125;")
         .split("\n\n")