subscriber: replace unmaintained ansi_term with nu-ansi-term (#2287)

This increases the MSRV of `tracing-subscriber` to 1.50+.

## Motivation

[ansi_term] last time update is over 2 years ago, use
nushell team forked [nu-ansi-term] instead

## Solution

Use [nu-ansi-term].

Closes #2040

[nu-ansi-term]: https://github.com/nushell/nu-ansi-term
[ansi_term]: https://github.com/ogham/rust-ansi-term

.github/workflows/CI.yml

@@ -134,26 +134,32 @@ jobs:
         # number, we can't just use --all as it increases the runtime
         # further than what we would like to
         subcrate:
+        - tracing-appender
         - tracing-attributes
         - tracing-core
         - tracing-futures
         - tracing-log
         - tracing-macros
         - tracing-serde
+        - tracing-subscriber
         - tracing-tower
         - tracing-opentelemetry
         - tracing
-        - tracing-subscriber
         toolchain:
         - 1.49.0
         - stable
         # TODO(eliza): remove this when appender is on the same MSRV.
+        #              same for tracing subscriber
         exclude:
         - subcrate: tracing-appender
           toolchain: 1.49.0
+        - subcrate: tracing-subscriber
+          toolchain: 1.49.0
         include:
         - subcrate: tracing-appender
           toolchain: 1.53.0
+        - subcrate: tracing-subscriber
+          toolchain: 1.50.0
     steps:
     - uses: actions/checkout@v3
     - name: install Rust nightly

examples/Cargo.toml

@@ -43,7 +43,7 @@ bytes = "1.2.0"
 argh = "0.1.8"
 
 # sloggish example
-ansi_term = "0.12.1"
+nu-ansi-term = "0.46.0"
 humantime = "2.1.0"
 log = "0.4.17"
 

examples/examples/sloggish/sloggish_collector.rs

@@ -1,4 +1,4 @@
-use ansi_term::{Color, Style};
+use nu_ansi_term::{Color, Style};
 use tracing::{
     field::{Field, Visit},
     Collect, Id, Level, Metadata,
@@ -120,7 +120,7 @@ impl<'a> Visit for Event<'a> {
             write!(
                 &mut self.stderr,
                 "{}",
-                // Have to alloc here due to `ansi_term`'s API...
+                // Have to alloc here due to `nu_ansi_term`'s API...
                 Style::new().bold().paint(format!("{:?}", value))
             )
             .unwrap();

tracing-subscriber/Cargo.toml

@@ -20,7 +20,7 @@ categories = [
     "asynchronous",
 ]
 keywords = ["logging", "tracing", "metrics", "subscriber"]
-rust-version = "1.49.0"
+rust-version = "1.50.0"
 
 [features]
 
@@ -29,7 +29,7 @@ alloc = ["tracing-core/alloc"]
 std = ["alloc", "tracing-core/std"]
 env-filter = ["matchers", "regex", "once_cell", "tracing", "std", "thread_local"]
 fmt = ["registry", "std"]
-ansi = ["fmt", "ansi_term"]
+ansi = ["fmt", "nu-ansi-term"]
 registry = ["sharded-slab", "thread_local", "std"]
 json = ["tracing-serde", "serde", "serde_json"]
 # Enables support for local time when using the `time` crate timestamp
@@ -48,7 +48,7 @@ once_cell = { optional = true, version = "1.13.0" }
 
 # fmt
 tracing-log = { path = "../tracing-log", version = "0.2", optional = true, default-features = false, features = ["log-tracer", "std"] }
-ansi_term = { version = "0.12.1", optional = true }
+nu-ansi-term = { version = "0.46.0", optional = true }
 time = { version = "0.3.2", features = ["formatting"], optional = true }
 
 # only required by the json feature

tracing-subscriber/README.md

@@ -32,14 +32,14 @@ Utilities for implementing and composing [`tracing`][tracing] subscribers.
 [discord-url]: https://discord.gg/EeF3cQw
 [maint-badge]: https://img.shields.io/badge/maintenance-experimental-blue.svg
 
-*Compiler support: [requires `rustc` 1.49+][msrv]*
+*Compiler support: [requires `rustc` 1.50+][msrv]*
 
 [msrv]: #supported-rust-versions
 
 ## Supported Rust Versions
 
 Tracing is built against the latest stable release. The minimum supported
-version is 1.49. The current Tracing version is not guaranteed to build on Rust
+version is 1.50. The current Tracing version is not guaranteed to build on Rust
 versions earlier than the minimum supported version.
 
 Tracing follows the same compiler support policies as the rest of the Tokio

tracing-subscriber/src/filter/env/builder.rs

@@ -209,15 +209,15 @@ impl Builder {
         }
 
         if !disabled.is_empty() {
-            #[cfg(feature = "ansi_term")]
-            use ansi_term::{Color, Style};
+            #[cfg(feature = "nu_ansi_term")]
+            use nu_ansi_term::{Color, Style};
             // NOTE: We can't use a configured `MakeWriter` because the EnvFilter
             // has no knowledge of any underlying subscriber or collector, which
             // may or may not use a `MakeWriter`.
             let warn = |msg: &str| {
-                #[cfg(not(feature = "ansi_term"))]
+                #[cfg(not(feature = "nu_ansi_term"))]
                 let msg = format!("warning: {}", msg);
-                #[cfg(feature = "ansi_term")]
+                #[cfg(feature = "nu_ansi_term")]
                 let msg = {
                     let bold = Style::new().bold();
                     let mut warning = Color::Yellow.paint("warning");
@@ -227,9 +227,9 @@ impl Builder {
                 eprintln!("{}", msg);
             };
             let ctx_prefixed = |prefix: &str, msg: &str| {
-                #[cfg(not(feature = "ansi_term"))]
+                #[cfg(not(feature = "nu_ansi_term"))]
                 let msg = format!("{} {}", prefix, msg);
-                #[cfg(feature = "ansi_term")]
+                #[cfg(feature = "nu_ansi_term")]
                 let msg = {
                     let mut equal = Color::Fixed(21).paint("="); // dark blue
                     equal.style_ref_mut().is_bold = true;
@@ -240,9 +240,9 @@ impl Builder {
             let ctx_help = |msg| ctx_prefixed("help:", msg);
             let ctx_note = |msg| ctx_prefixed("note:", msg);
             let ctx = |msg: &str| {
-                #[cfg(not(feature = "ansi_term"))]
+                #[cfg(not(feature = "nu_ansi_term"))]
                 let msg = format!("note: {}", msg);
-                #[cfg(feature = "ansi_term")]
+                #[cfg(feature = "nu_ansi_term")]
                 let msg = {
                     let mut pipe = Color::Fixed(21).paint("|");
                     pipe.style_ref_mut().is_bold = true;

tracing-subscriber/src/fmt/format/mod.rs

@@ -46,7 +46,7 @@ use tracing_core::{
 use tracing_log::NormalizeEvent;
 
 #[cfg(feature = "ansi")]
-use ansi_term::{Colour, Style};
+use nu_ansi_term::{Color, Style};
 
 #[cfg(feature = "json")]
 mod json;
@@ -103,7 +103,7 @@ use fmt::{Debug, Display};
 ///   does not support ANSI escape codes (such as a log file), and they should
 ///   not be emitted.
 ///
-///   Crates like [`ansi_term`] and [`owo-colors`] can be used to add ANSI
+///   Crates like [`nu_ansi_term`] and [`owo-colors`] can be used to add ANSI
 ///   escape codes to formatted output.
 ///
 /// * The actual [`Event`] to be formatted.
@@ -191,7 +191,7 @@ use fmt::{Debug, Display};
 /// [implements `FormatFields`]: super::FmtContext#impl-FormatFields<'writer>
 /// [ANSI terminal escape codes]: https://en.wikipedia.org/wiki/ANSI_escape_code
 /// [`Writer::has_ansi_escapes`]: Writer::has_ansi_escapes
-/// [`ansi_term`]: https://crates.io/crates/ansi_term
+/// [`nu_ansi_term`]: https://crates.io/crates/nu_ansi_term
 /// [`owo-colors`]: https://crates.io/crates/owo-colors
 /// [default formatter]: Full
 pub trait FormatEvent<C, N>
@@ -1402,11 +1402,11 @@ impl<F: LevelNames> fmt::Display for FmtLevel<F> {
         {
             if self.ansi {
                 return match self.level {
-                    Level::TRACE => write!(f, "{}", Colour::Purple.paint(F::TRACE_STR)),
-                    Level::DEBUG => write!(f, "{}", Colour::Blue.paint(F::DEBUG_STR)),
-                    Level::INFO => write!(f, "{}", Colour::Green.paint(F::INFO_STR)),
-                    Level::WARN => write!(f, "{}", Colour::Yellow.paint(F::WARN_STR)),
-                    Level::ERROR => write!(f, "{}", Colour::Red.paint(F::ERROR_STR)),
+                    Level::TRACE => write!(f, "{}", Color::Purple.paint(F::TRACE_STR)),
+                    Level::DEBUG => write!(f, "{}", Color::Blue.paint(F::DEBUG_STR)),
+                    Level::INFO => write!(f, "{}", Color::Green.paint(F::INFO_STR)),
+                    Level::WARN => write!(f, "{}", Color::Yellow.paint(F::WARN_STR)),
+                    Level::ERROR => write!(f, "{}", Color::Red.paint(F::ERROR_STR)),
                 };
             }
         }

tracing-subscriber/src/fmt/format/pretty.rs

@@ -14,7 +14,7 @@ use tracing_core::{
 #[cfg(feature = "tracing-log")]
 use tracing_log::NormalizeEvent;
 
-use ansi_term::{Colour, Style};
+use nu_ansi_term::{Color, Style};
 
 /// An excessively pretty, human-readable event formatter.
 ///
@@ -143,11 +143,11 @@ impl Default for Pretty {
 impl Pretty {
     fn style_for(level: &Level) -> Style {
         match *level {
-            Level::TRACE => Style::new().fg(Colour::Purple),
-            Level::DEBUG => Style::new().fg(Colour::Blue),
-            Level::INFO => Style::new().fg(Colour::Green),
-            Level::WARN => Style::new().fg(Colour::Yellow),
-            Level::ERROR => Style::new().fg(Colour::Red),
+            Level::TRACE => Style::new().fg(Color::Purple),
+            Level::DEBUG => Style::new().fg(Color::Blue),
+            Level::INFO => Style::new().fg(Color::Green),
+            Level::WARN => Style::new().fg(Color::Yellow),
+            Level::ERROR => Style::new().fg(Color::Red),
         }
     }
 

tracing-subscriber/src/lib.rs

@@ -10,7 +10,7 @@
 //! `tracing-subscriber` is intended for use by both `Collector` authors and
 //! application authors using `tracing` to instrument their applications.
 //!
-//! *Compiler support: [requires `rustc` 1.49+][msrv]*
+//! *Compiler support: [requires `rustc` 1.50+][msrv]*
 //!
 //! [msrv]: #supported-rust-versions
 //!
@@ -106,7 +106,7 @@
 //! ## Supported Rust Versions
 //!
 //! Tracing is built against the latest stable release. The minimum supported
-//! version is 1.49. The current Tracing version is not guaranteed to build on
+//! version is 1.50. The current Tracing version is not guaranteed to build on
 //! Rust versions earlier than the minimum supported version.
 //!
 //! Tracing follows the same compiler support policies as the rest of the Tokio