NyxCode · April 25, 2019 10:35 · Apr 25, 2019
diff --git a/AutoFont.kt b/AutoFont.kt
@@ -0,0 +1,69 @@
+import org.apache.commons.io.FileUtils
+import java.awt.Font
+import java.awt.GraphicsEnvironment
+import java.io.File
+import java.io.FileNotFoundException
+import java.net.URL
+
+private const val FONTS_REPOSITORY = "https://github.com/google/fonts/raw/master"
+private val LICENSES = arrayOf("apache", "ofl", "ufl")
+private val SANITIZE_EXPR = Regex("\\W+")
+
+enum class Emphasis {
+    Regular,
+    Bold,
+    Italic,
+    Light,
+    Medium,
+    Thin,
+    Black
+}
+
+fun installFont(name: String, vararg emphasis: Emphasis) {
+    print("Downloading Font..")
+    val file = downloadFont(_fontName = name, emphasis = *emphasis)
+    print("Installing Font..")
+    GraphicsEnvironment
+        .getLocalGraphicsEnvironment()
+        .registerFont(Font.createFont(Font.TRUETYPE_FONT, file))
+    print("Done!")
+}
+
+fun downloadFont(directory: File = createTempDir(), _fontName: String, vararg emphasis: Emphasis): File {
+    assert(directory.isDirectory) { "$directory is not a directory" }
+
+    val fontName = _fontName.replace(SANITIZE_EXPR, "")
+
+    val fileName = constructFilename(fontName, *emphasis)
+
+    val targetFile = File(directory, fileName)
+    if (targetFile.isFile) {
+        println("$targetFile already exists, skipping download")
+        return targetFile
+    }
+
+    for (license in LICENSES) {
+        try {
+            val url = URL("$FONTS_REPOSITORY/$license/${fontName.toLowerCase()}/$fileName")
+            FileUtils.copyURLToFile(url, targetFile)
+            return targetFile
+        } catch (_: FileNotFoundException) {
+            // Ignore
+        }
+    }
+
+    throw FileNotFoundException()
+}
+
+private fun constructFilename(sanitizedName: String, vararg emphasis: Emphasis): String {
+    val emphasisStr = if (emphasis.isEmpty()) {
+        "Regular"
+    } else {
+        emphasis
+            .distinct()
+            .map(Emphasis::name)
+            .joinToString(separator = "")
+    }
+
+    return "$sanitizedName-$emphasisStr.ttf"
+}