Enable native-certs in ureq by default

* Add features to the version string

Cargo.toml

@@ -15,8 +15,11 @@ name = "tldr"
 path = "src/main.rs"
 
 [features]
-default = ["socks-proxy"]
+# The default TLS implementation is Rustls with native certificates.
+# Disabling the `native-certs` feature switches to Rustls with webpki-roots.
+default = ["socks-proxy", "native-certs"]
 socks-proxy = ["ureq/socks-proxy"]
+native-certs = ["ureq/native-certs"]
 
 [dependencies]
 clap = { version = "4.5.4", features = ["derive"] }

build.rs

@@ -5,6 +5,18 @@ use std::process;
 /// The version of the tldr client specification being implemented.
 const CLIENT_SPEC: &str = "2.2";
 
+const TLS: &str = if cfg!(feature = "native-certs") {
+    "Rustls + native certs"
+} else {
+    "Rustls + webpki-roots"
+};
+
+const SOCKS: &str = if cfg!(feature = "socks-proxy") {
+    "+SOCKS"
+} else {
+    "-SOCKS"
+};
+
 fn is_debug_build() -> bool {
     env::var("PROFILE").unwrap() == "debug"
 }
@@ -48,4 +60,5 @@ fn main() {
 
     // Put the version string inside an environment variable during the build.
     println!("cargo:rustc-env=VERSION_STRING={ver}");
+    println!("cargo:rustc-env=FEATURES=[{TLS}, {SOCKS}]");
 }

src/args.rs

@@ -31,11 +31,11 @@ const AFTER_HELP: &str = if cfg!(target_os = "windows") {
 #[command(
     arg_required_else_help = true,
     about,
-    // VERSION_STRING is generated and set in the build script.
-    version = env!("VERSION_STRING"),
+    // These env vars are generated and set in the build script.
+    version = concat!(env!("VERSION_STRING"), '\n', env!("FEATURES")),
     disable_version_flag = true,
     after_help = AFTER_HELP,
-    help_template = "{before-help}{name} {version}\n\
+    help_template = "{before-help}{name} {version}\n\n\
     {about-with-newline}\n\
     {usage-heading} {usage}\n\n\
     {all-args}{after-help}"