switch from open to opener

By default, `opener` launches the subprocess without waiting for its
completion, compared to `open` which waits for its completion.

This is helpful in case the `watch` feature is enabled and one of the
following commands `watch | serve --open` is used. If this command would
open the browser, listening for changes would be blocked by the browser.

Cargo.lock

@@ -131,9 +131,9 @@ dependencies = [
 
 [[package]]
 name = "bstr"
-version = "0.2.16"
+version = "0.2.17"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "90682c8d613ad3373e66de8c6411e0ae2ab2571e879d2efbf73558cc66f21279"
+checksum = "ba3569f383e8f1598449f1a423e72e99569137b47740b1da11ef19af3d5c3223"
 dependencies = [
  "lazy_static",
  "memchr",
@@ -855,7 +855,7 @@ dependencies = [
  "log",
  "memchr",
  "notify",
- "open",
+ "opener",
  "predicates",
  "pretty_assertions",
  "pulldown-cmark",
@@ -1052,12 +1052,12 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "624a8340c38c1b80fd549087862da4ba43e08858af025b236e509b6649fc13d5"
 
 [[package]]
-name = "open"
-version = "2.0.1"
+name = "opener"
+version = "0.5.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "b46b233de7d83bc167fe43ae2dda3b5b84e80e09cceba581e4decb958a4896bf"
+checksum = "4ea3ebcd72a54701f56345f16785a6d3ac2df7e986d273eb4395c0b01db17952"
 dependencies = [
- "pathdiff",
+ "bstr",
  "winapi 0.3.9",
 ]
 
@@ -1070,12 +1070,6 @@ dependencies = [
  "winapi 0.3.9",
 ]
 
-[[package]]
-name = "pathdiff"
-version = "0.2.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "877630b3de15c0b64cc52f659345724fbf6bdad9bd9566699fc53688f3c34a34"
-
 [[package]]
 name = "percent-encoding"
 version = "2.1.0"

Cargo.toml

@@ -24,7 +24,7 @@ handlebars = "4.0"
 lazy_static = "1.0"
 log = "0.4"
 memchr = "2.0"
-open = "2.0"
+opener = "0.5"
 pulldown-cmark = "0.7.0"
 regex = "1.0.0"
 serde = "1.0"

src/main.rs

@@ -133,7 +133,7 @@ fn get_book_dir(args: &ArgMatches) -> PathBuf {
 
 fn open<P: AsRef<OsStr>>(path: P) {
     info!("Opening web browser");
-    if let Err(e) = open::that(path) {
+    if let Err(e) = opener::open(path) {
         error!("Error opening web browser: {}", e);
     }
 }