feat(font): install system wide as root on Linux

src/font/install_unix.go

@@ -10,15 +10,23 @@ import (
 	"strings"
 )
 
-// FontsDir denotes the path to the user's fonts directory on Unix-like systems.
-var FontsDir = path.Join(os.Getenv("HOME"), "/.local/share/fonts")
+var (
+	fontsDir       = path.Join(os.Getenv("HOME"), "/.local/share/fonts")
+	systemFontsDir = "/usr/share/fonts"
+)
 
 func install(font *Font, _ bool) error {
+	// If we're running as root, install the font system-wide.
+	targetDir := fontsDir
+	if os.Geteuid() == 0 {
+		targetDir = systemFontsDir
+	}
+
 	// On Linux, fontconfig can understand subdirectories. So, to keep the
 	// font directory clean, install all font files for a particular font
 	// family into a subdirectory named after the family (with hyphens instead
 	// of spaces).
-	fullPath := path.Join(FontsDir,
+	fullPath := path.Join(targetDir,
 		strings.ToLower(strings.ReplaceAll(font.Family, " ", "-")),
 		path.Base(font.FileName))
 

website/docs/installation/fonts.mdx

@@ -33,6 +33,11 @@ In case you have no admin rights, you can install the fonts by adding the `--use
 Do know this can have side-effects when using certain applications.
 :::
 
+:::info Linux
+On Linux, when running as root, the fonts will be installed system-wide.
+When running as a regular user, the fonts will be installed in the user's font directory.
+:::
+
 ```bash
 oh-my-posh font install
 ```