feat: support inferring the color profile from terminfo dbs

This will try to load the terminal terminfo database and infer the color
profile supported by the terminal.

env.go

@@ -6,6 +6,7 @@ import (
 	"strings"
 
 	"github.com/charmbracelet/x/exp/term"
+	"github.com/xo/terminfo"
 )
 
 // envNoColor returns true if the environment variables explicitly disable color output
@@ -106,6 +107,29 @@ func detectColorProfile(env map[string]string) (p Profile) {
 		setProfile(ANSI)
 	}
 
+	ti, _ := terminfo.Load(term)
+	if ti != nil {
+		extbools := ti.ExtBoolCapsShort()
+		if _, ok := extbools["RGB"]; ok {
+			setProfile(TrueColor)
+		}
+
+		if _, ok := extbools["Tc"]; ok {
+			setProfile(TrueColor)
+		}
+
+		nums := ti.NumCapsShort()
+		if colors, ok := nums["colors"]; ok {
+			if colors >= 0x1000000 {
+				setProfile(TrueColor)
+			} else if colors >= 0x100 {
+				setProfile(ANSI256)
+			} else if colors >= 0x10 {
+				setProfile(ANSI)
+			}
+		}
+	}
+
 	return
 }
 

go.mod

@@ -8,11 +8,11 @@ require (
 	github.com/charmbracelet/x/exp/term v0.0.0-20240425164147-ba2a9512b05f
 	github.com/lucasb-eyer/go-colorful v1.2.0
 	github.com/rivo/uniseg v0.4.7
+	github.com/xo/terminfo v0.0.0-20220910002029-abceb7e1c41e
 	golang.org/x/sys v0.19.0
 )
 
 require (
 	github.com/erikgeiser/coninput v0.0.0-20211004153227-1c3628e74d0f // indirect
 	github.com/muesli/cancelreader v0.2.2 // indirect
-	github.com/xo/terminfo v0.0.0-20220910002029-abceb7e1c41e // indirect
 )