don't pull attributes feature of tracing

Author: matklad

Cargo.toml

@@ -9,7 +9,7 @@ repository = "https://github.com/davidbarsky/tracing-tree"
 readme = "README.md"
 
 [dependencies]
-tracing = "0.1"
+tracing-core = "0.1"
 tracing-subscriber = { version = "0.2", default-features = false, features = ["registry", "fmt"] }
 termcolor = "1.1"
 ansi_term = "0.12"
@@ -20,6 +20,7 @@ tracing-log = { version = "0.1", optional = true }
 default = ["tracing-log"]
 
 [dev-dependencies]
+tracing = "0.1"
 glob = "0.3"
 assert_cmd = "1"
 log = "0.4"

src/format.rs

@@ -3,7 +3,7 @@ use std::{
     fmt::{self, Write as _},
     io,
 };
-use tracing::{
+use tracing_core::{
     field::{Field, Visit},
     Level,
 };

src/lib.rs

@@ -8,7 +8,7 @@ use std::{
     sync::Mutex,
     time::Instant,
 };
-use tracing::{
+use tracing_core::{
     field::{Field, Visit},
     span::{Attributes, Id},
     Event, Subscriber,
@@ -27,7 +27,7 @@ pub(crate) struct Data {
 }
 
 impl Data {
-    pub fn new(attrs: &tracing::span::Attributes<'_>) -> Self {
+    pub fn new(attrs: &Attributes<'_>) -> Self {
         let mut span = Self {
             start: Instant::now(),
             kvs: Vec::new(),
@@ -209,7 +209,7 @@ where
 
     fn write_span_info<S: Subscriber + for<'span> LookupSpan<'span> + fmt::Debug>(
         &self,
-        id: &tracing::Id,
+        id: &Id,
         ctx: &Context<S>,
         style: SpanMode,
     ) {