feat: improve styling, and disable if not interactive

This makes the headers more obvious. It also drops styling so the
output isn't cluttered with color codes if we are not in an interactive
terminal (or `NO_COLOR` is set).

Ref: https://docs.rs/yansi/latest/yansi/fn.whenever.html

Cargo.toml

@@ -18,4 +18,4 @@ clap = { version = "4.5.4", features = ["wrap_help", "derive"] }
 rayon = "1.10.0"
 tabled = { version = "0.15.0", features = ["ansi"] }
 xshell = "0.2.6"
-yansi = "1.0.1"
+yansi = { version = "1.0.1", features = ["detect-tty", "detect-env"] }

src/main.rs

@@ -11,7 +11,7 @@ use tabled::{
     },
     Table, Tabled,
 };
-use yansi::Paint;
+use yansi::{Condition, Paint};
 
 use xshell::{cmd, Shell};
 
@@ -85,6 +85,18 @@ fn main() -> Result<()> {
     let cli = Cli::parse();
     let sh = Shell::new()?;
 
+    yansi::whenever(Condition::STDOUT_IS_TTY);
+
+    // On each styling, check if we have TTYs.
+    yansi::whenever(Condition::STDOUTERR_ARE_TTY_LIVE);
+    // Check `NO_COLOR`, `CLICOLOR`, and if we have TTYs.
+    const HAVE_COLOR: Condition = Condition(|| {
+        std::env::var_os("NO_COLOR").is_none()
+            && (Condition::CLICOLOR_LIVE)()
+            && Condition::stdouterr_are_tty_live()
+    });
+    yansi::whenever(Condition::cached((HAVE_COLOR)()));
+
     let rev_range = cli.rev_range;
     let raw_shortlog = if cli.email {
         cmd!(sh, "git shortlog -sen {rev_range}").read()?
@@ -169,6 +181,10 @@ fn main() -> Result<()> {
             .with(Style::empty())
             .modify(Columns::new(1..=5), Alignment::right())
             .modify(Rows::last(), Alignment::right())
+            .modify(
+                Rows::first(),
+                Format::content(|s| s.bold().underline().to_string()),
+            )
             .modify(Rows::last(), Format::content(|s| s.bold().to_string()));
 
         println!("{table}");