Add option with_trimmed_directory.

This option strips the directory from the file path, like some
other glog libraries do by default.

Author: petm-dec

src/format.rs

@@ -1,6 +1,6 @@
 #[cfg(feature = "ansi")]
 use crate::nu_ansi_term::{Color, Style};
-use std::{fmt, io};
+use std::{ffi::OsStr, fmt, io, path::Path};
 use time::{format_description::FormatItem, formatting::Formattable, OffsetDateTime};
 use tracing::{Level, Metadata};
 use tracing_subscriber::fmt::{format::Writer, time::FormatTime};
@@ -208,13 +208,28 @@ pub(crate) struct FormatProcessData<'a> {
     pub(crate) with_target: bool,
     #[cfg(feature = "ansi")]
     pub(crate) ansi: bool,
+    pub(crate) with_trimmed_directory: bool,
 }
 
 impl<'a> fmt::Display for FormatProcessData<'a> {
     fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
         let thread_name = self.thread_name;
         let target = self.metadata.target();
-        let file = self.metadata.file().unwrap_or("");
+        let file = self
+            .metadata
+            .file()
+            .map(|f| {
+                if self.with_trimmed_directory {
+                    let path = Path::new(f);
+                    path.file_name()
+                        .map(OsStr::to_str)
+                        .unwrap_or_default()
+                        .unwrap_or_default()
+                } else {
+                    f
+                }
+            })
+            .unwrap_or("");
         let line = match self.metadata.line() {
             Some(line) => format!("{}", line),
             None => String::new(),

src/lib.rs

@@ -150,6 +150,7 @@ pub struct Glog<T = UtcTime> {
     with_span_context: bool,
     with_thread_names: bool,
     with_target: bool,
+    with_trimmed_directory: bool,
 }
 
 impl<T> Glog<T> {
@@ -168,6 +169,7 @@ impl<T> Glog<T> {
             with_thread_names: self.with_thread_names,
             with_target: self.with_target,
             with_span_context: self.with_span_context,
+            with_trimmed_directory: self.with_trimmed_directory,
         }
     }
 
@@ -185,6 +187,13 @@ impl<T> Glog<T> {
         }
     }
 
+    pub fn with_trimmed_directory(self, with_trimmed_directory: bool) -> Glog<T> {
+        Glog {
+            with_trimmed_directory: with_trimmed_directory,
+            ..self
+        }
+    }
+
     /// Sets whether or not the span context is included. Defaults to true.
     ///
     /// By default, formatters building atop of [`mod@tracing_subscriber::fmt`]
@@ -220,6 +229,7 @@ impl Default for Glog<UtcTime> {
             with_thread_names: false,
             with_target: false,
             with_span_context: true,
+            with_trimmed_directory: false,
         }
     }
 }
@@ -265,6 +275,7 @@ where
             with_target: self.with_target,
             #[cfg(feature = "ansi")]
             ansi: writer.has_ansi_escapes(),
+            with_trimmed_directory: self.with_trimmed_directory,
         };
         write!(writer, "{}] ", data)?;