remove newlines from non-line-indented output

examples/no-indent.rs

@@ -0,0 +1,79 @@
+use tracing::{debug, error, info, instrument, span, warn, Level};
+use tracing_subscriber::{layer::SubscriberExt, registry::Registry};
+use tracing_tree::HierarchicalLayer;
+
+fn main() {
+    let layer = HierarchicalLayer::default()
+        .with_writer(std::io::stdout)
+        .with_indent_amount(2)
+        .with_thread_names(true)
+        .with_thread_ids(true)
+        .with_verbose_exit(false)
+        .with_verbose_entry(false)
+        .with_targets(true);
+
+    let subscriber = Registry::default().with(layer);
+    tracing::subscriber::set_global_default(subscriber).unwrap();
+
+    let app_span = span!(Level::TRACE, "hierarchical-example", version = %0.1);
+    let _e = app_span.enter();
+
+    let server_span = span!(Level::TRACE, "server", host = "localhost", port = 8080);
+    let _e2 = server_span.enter();
+    info!("starting");
+    std::thread::sleep(std::time::Duration::from_millis(300));
+    info!("listening");
+    let peer1 = span!(Level::TRACE, "conn", peer_addr = "82.9.9.9", port = 42381);
+    peer1.in_scope(|| {
+        debug!("connected");
+        std::thread::sleep(std::time::Duration::from_millis(300));
+        debug!(length = 2, "message received");
+    });
+    drop(peer1);
+    let peer2 = span!(Level::TRACE, "conn", peer_addr = "8.8.8.8", port = 18230);
+    peer2.in_scope(|| {
+        std::thread::sleep(std::time::Duration::from_millis(300));
+        debug!("connected");
+    });
+    drop(peer2);
+    let peer3 = span!(
+        Level::TRACE,
+        "foomp",
+        normal_var = 43,
+        "{} <- format string",
+        42
+    );
+    peer3.in_scope(|| {
+        error!("hello");
+    });
+    drop(peer3);
+    let peer1 = span!(Level::TRACE, "conn", peer_addr = "82.9.9.9", port = 42381);
+    peer1.in_scope(|| {
+        warn!(algo = "xor", "weak encryption requested");
+        std::thread::sleep(std::time::Duration::from_millis(300));
+        debug!(length = 8, "response sent");
+        debug!("disconnected");
+    });
+    drop(peer1);
+    let peer2 = span!(Level::TRACE, "conn", peer_addr = "8.8.8.8", port = 18230);
+    peer2.in_scope(|| {
+        debug!(length = 5, "message received");
+        std::thread::sleep(std::time::Duration::from_millis(300));
+        debug!(length = 8, "response sent");
+        debug!("disconnected");
+    });
+    drop(peer2);
+    warn!("internal error");
+    info!("exit");
+}
+
+#[instrument]
+fn call_a(name: &str) {
+    info!(name, "got a name");
+    call_b(name)
+}
+
+#[instrument]
+fn call_b(name: &str) {
+    info!(name, "got a name");
+}

examples/no-indent.stdout

@@ -0,0 +1,21 @@
+1:main no_indent::hierarchical-example version=0.1
+1:main   no_indent::server host="localhost", port=8080
+1:main       Xms INFO no_indent starting
+1:main       Xms INFO no_indent listening
+1:main     no_indent::conn peer_addr="82.9.9.9", port=42381
+1:main         Xms DEBUG no_indent connected
+1:main         Xms DEBUG no_indent message received, length=2
+1:main     no_indent::conn peer_addr="8.8.8.8", port=18230
+1:main         Xms DEBUG no_indent connected
+1:main     no_indent::foomp 42 <- format string, normal_var=43
+1:main         Xms ERROR no_indent hello
+1:main     no_indent::conn peer_addr="82.9.9.9", port=42381
+1:main         Xms WARN no_indent weak encryption requested, algo="xor"
+1:main         Xms DEBUG no_indent response sent, length=8
+1:main         Xms DEBUG no_indent disconnected
+1:main     no_indent::conn peer_addr="8.8.8.8", port=18230
+1:main         Xms DEBUG no_indent message received, length=5
+1:main         Xms DEBUG no_indent response sent, length=8
+1:main         Xms DEBUG no_indent disconnected
+1:main       Xs  WARN no_indent internal error
+1:main       Xs  INFO no_indent exit

src/format.rs

@@ -167,11 +167,12 @@ impl Buffers {
     }
 
     pub(crate) fn indent_current(&mut self, indent: usize, config: &Config, style: SpanMode) {
-        self.current_buf.push('\n');
         let prefix = config.prefix();
 
         // Render something when wraparound occurs so the user is aware of it
         if config.indent_lines {
+            self.current_buf.push('\n');
+
             match style {
                 SpanMode::Close { .. } | SpanMode::PostClose => {
                     if indent > 0 && (indent + 1) % config.wraparound == 0 {
@@ -417,6 +418,7 @@ fn indent_block(
         let indent_str = String::from(" ").repeat(indent_spaces);
         for line in lines {
             buf.push_str(prefix);
+            buf.push(' ');
             buf.push_str(&indent_str);
             buf.push_str(line);
             buf.push('\n');