make time entirely optional

Cargo.toml

@@ -20,12 +20,13 @@ include = [
 
 [features]
 test = []
-default = ["termcolor", "local-offset"]
-local-offset = ["time/local-offset"]
+default = ["termcolor", "time", "local-offset"]
+time = []
+local-offset = ["time", "time/local-offset"]
 
 [dependencies]
 log = { version = "0.4.*", features = ["std"] }
 termcolor = { version = "1.1.*", optional = true }
 paris = { version = "~1.5", optional = true }
 ansi_term = { version = "0.12", optional = true }
-time = { version = "0.3.7", features = ["formatting", "macros"] }
+time = { version = "0.3.7", optional = true, features = ["formatting", "macros"] }

src/config.rs

@@ -5,6 +5,8 @@ use log::LevelFilter;
 use std::borrow::Cow;
 #[cfg(feature = "termcolor")]
 use termcolor::Color;
+
+#[cfg(feature = "time")]
 pub use time::{format_description::FormatItem, macros::format_description, UtcOffset};
 
 #[derive(Debug, Clone, Copy)]
@@ -52,6 +54,7 @@ pub enum ThreadLogMode {
 }
 
 #[derive(Debug, Clone)]
+#[cfg(feature = "time")]
 pub(crate) enum TimeFormat {
     Rfc2822,
     Rfc3339,
@@ -70,6 +73,7 @@ pub(crate) enum TimeFormat {
 /// Construct using [`Default`](Config::default) or using [`ConfigBuilder`]
 #[derive(Debug, Clone)]
 pub struct Config {
+    #[cfg(feature = "time")]
     pub(crate) time: LevelFilter,
     pub(crate) level: LevelFilter,
     pub(crate) level_padding: LevelPadding,
@@ -79,7 +83,9 @@ pub struct Config {
     pub(crate) target: LevelFilter,
     pub(crate) target_padding: TargetPadding,
     pub(crate) location: LevelFilter,
+    #[cfg(feature = "time")]
     pub(crate) time_format: TimeFormat,
+    #[cfg(feature = "time")]
     pub(crate) time_offset: UtcOffset,
     pub(crate) filter_allow: Cow<'static, [Cow<'static, str>]>,
     pub(crate) filter_ignore: Cow<'static, [Cow<'static, str>]>,
@@ -118,6 +124,7 @@ impl ConfigBuilder {
     }
 
     /// Set at which level and  above (more verbose) the current time shall be logged (default is Error)
+    #[cfg(feature = "time")]
     pub fn set_time_level(&mut self, time: LevelFilter) -> &mut ConfigBuilder {
         self.0.time = time;
         self
@@ -191,6 +198,7 @@ impl ConfigBuilder {
     ///     .set_time_format_custom(format_description!("[hour]:[minute]:[second].[subsecond]"))
     ///     .build();
     /// ```
+    #[cfg(feature = "time")]
     pub fn set_time_format_custom(
         &mut self,
         time_format: &'static [FormatItem<'static>],
@@ -200,18 +208,21 @@ impl ConfigBuilder {
     }
 
     /// Set time format string to use rfc2822.
+    #[cfg(feature = "time")]
     pub fn set_time_format_rfc2822(&mut self) -> &mut ConfigBuilder {
         self.0.time_format = TimeFormat::Rfc2822;
         self
     }
 
     /// Set time format string to use rfc3339.
+    #[cfg(feature = "time")]
     pub fn set_time_format_rfc3339(&mut self) -> &mut ConfigBuilder {
         self.0.time_format = TimeFormat::Rfc3339;
         self
     }
 
     /// Set offset used for logging time (default is UTC)
+    #[cfg(feature = "time")]
     pub fn set_time_offset(&mut self, offset: UtcOffset) -> &mut ConfigBuilder {
         self.0.time_offset = offset;
         self
@@ -224,7 +235,7 @@ impl ConfigBuilder {
     /// This may be the case, when the program is multi-threaded by the time of calling this function.
     /// One can opt-out of this behavior by setting `RUSTFLAGS="--cfg unsound_local_offset"`.
     /// Doing so is not recommended, completely untested and may cause unexpected segfaults.
-    #[cfg(feature = "local-offset")]
+    #[cfg(all(feature = "time", feature = "local-offset"))]
     pub fn set_time_offset_to_local(&mut self) -> Result<&mut ConfigBuilder, &mut ConfigBuilder> {
         match UtcOffset::current_local_offset() {
             Ok(offset) => {
@@ -315,6 +326,7 @@ impl Default for ConfigBuilder {
 impl Default for Config {
     fn default() -> Config {
         Config {
+            #[cfg(feature = "time")]
             time: LevelFilter::Error,
             level: LevelFilter::Error,
             level_padding: LevelPadding::Off,
@@ -324,7 +336,9 @@ impl Default for Config {
             target: LevelFilter::Debug,
             target_padding: TargetPadding::Off,
             location: LevelFilter::Trace,
+            #[cfg(feature = "time")]
             time_format: TimeFormat::Custom(format_description!("[hour]:[minute]:[second]")),
+            #[cfg(feature = "time")]
             time_offset: UtcOffset::UTC,
             filter_allow: Cow::Borrowed(&[]),
             filter_ignore: Cow::Borrowed(&[]),

src/lib.rs

@@ -25,9 +25,11 @@ mod config;
 mod loggers;
 
 pub use self::config::{
-    format_description, Config, ConfigBuilder, FormatItem, LevelPadding, TargetPadding,
+    Config, ConfigBuilder, LevelPadding, TargetPadding,
     ThreadLogMode, ThreadPadding,
 };
+#[cfg(feature = "time")]
+pub use self::config::{format_description, FormatItem};
 #[cfg(feature = "test")]
 pub use self::loggers::TestLogger;
 pub use self::loggers::{CombinedLogger, SimpleLogger, WriteLogger};
@@ -106,8 +108,13 @@ mod tests {
             let mut vec = Vec::new();
             let mut conf_builder = ConfigBuilder::new();
 
-            let conf_thread_name = ConfigBuilder::new()
-                .set_time_level(LevelFilter::Off)
+            let mut conf_thread_name = ConfigBuilder::new();
+
+            #[cfg(feature = "time")]
+            let mut conf_thread_name = conf_thread_name
+                .set_time_level(LevelFilter::Off);
+
+            let conf_thread_name = conf_thread_name
                 .set_thread_level(LevelFilter::Error)
                 .set_thread_mode(ThreadLogMode::Names)
                 .build();
@@ -129,9 +136,12 @@ mod tests {
                 let conf = conf_builder
                     .set_location_level(elem)
                     .set_target_level(elem)
-                    .set_max_level(elem)
-                    .set_time_level(elem)
-                    .build();
+                    .set_max_level(elem);
+
+                #[cfg(feature = "time")]
+                let conf = conf.set_time_level(elem);
+
+                let conf = conf.build();
                 i += 1;
 
                 //error

src/loggers/logging.rs

@@ -1,4 +1,6 @@
-use crate::config::{TargetPadding, TimeFormat};
+use crate::config::TargetPadding;
+#[cfg(feature = "time")]
+use crate::config::TimeFormat;
 use crate::{Config, LevelPadding, ThreadLogMode, ThreadPadding};
 use log::{LevelFilter, Record};
 use std::io::{Error, Write};
@@ -30,6 +32,7 @@ where
         return Ok(());
     }
 
+    #[cfg(feature = "time")]
     if config.time <= record.level() && config.time != LevelFilter::Off {
         write_time(write, config)?;
     }
@@ -61,6 +64,7 @@ where
 }
 
 #[inline(always)]
+#[cfg(feature = "time")]
 pub fn write_time<W>(write: &mut W, config: &Config) -> Result<(), Error>
 where
     W: Write + Sized,

src/loggers/termlog.rs

@@ -133,6 +133,7 @@ impl TermLogger {
         #[cfg(not(feature = "ansi_term"))]
         let color = self.config.level_color[record.level() as usize];
 
+        #[cfg(feature = "time")]
         if self.config.time <= record.level() && self.config.time != LevelFilter::Off {
             write_time(term_lock, &self.config)?;
         }