Fix default weight when the fonts are italic

When the chosen font has a weight of 400 and the style is italic, a mode similar to `wght@` is enabled.

For example, `Roboto+Mono:ital@0;1` means that both the normal and italic Roboto Mono 400 fonts should be added to the stylesheet.

index.html

@@ -10,7 +10,8 @@
     <span>
       Transform  <a href="https://fonts.google.com/">Google Fonts</a> links to a CSS from a <a href="https://cdn.sofiaritz.com/fonts/">Google Fonts binary mirror</a>.
       Created by <a href="https://sofiaritz.com">Sofía Aritz</a>.
-    </span>
+    </span><br>
+    <span>Source code available here: <a href="https://git.sofiaritz.com/sofia/gfonts-interface">sofia/gfonts-interface@git.sofiaritz.com</a>.</span>
   </header>
   <div class="page-container">
     <main id="app"></main>

src/App.svelte

@@ -2,7 +2,7 @@
   import {css2_to_cssfile} from "./lib/utils.ts";
   import PreCopy from "./lib/PreCopy.svelte";
 
-  let gf_input = "https://fonts.googleapis.com/css2?family=Fira+Sans:ital,wght@0,300;1,200;1,500&family=Poppins:wght@300;400&family=Wix+Madefor+Display:wght@700&display=swap"
+  let gf_input = "https://fonts.googleapis.com/css2?family=Roboto+Mono:ital@0;1&family=Roboto:ital@0;1&display=swap"
   let mirror_input = "https://cdn.sofiaritz.com/fonts"
   let output = new Promise(resolve => resolve(null))
 

src/lib/css2.ts

@@ -14,9 +14,11 @@ export function parse_family(input: string): Family {
     let font = rfont.replaceAll("+", "").toLowerCase()
     let variants: Variant[] = []
     if(rvariants != null && rvariants.length > 0) {
-        let rfragments = rvariants.split("wght@").filter(v => v.length > 0)
+        let rfragments = rvariants.split("@").filter(v => v.length > 0)
         let fragments
-        if (rfragments[0].startsWith("ital")) {
+        let with_weight = rfragments[0].includes("wght")
+        let with_ital = rfragments[0].includes("ital")
+        if (with_ital || with_weight) {
             fragments = rfragments[1]
         } else {
             fragments = rfragments[0]
@@ -24,6 +26,7 @@ export function parse_family(input: string): Family {
 
         let rsubvariants = fragments.split(";")
         for (let rvariant of rsubvariants) {
+            if (with_weight) {
                 if (rvariant.includes(",")) {
                     let variant = rvariant.split(",")
                     variants.push({
@@ -36,6 +39,15 @@ export function parse_family(input: string): Family {
                         style: "normal",
                     })
                 }
+            } else if(with_ital) {
+                let italvariants = rvariant.split(",")
+                for (let variant of italvariants) {
+                    variants.push({
+                        weight: 400,
+                        style: Number(variant) === 1 ? "italic" : "normal"
+                    })
+                }
+            }
         }
     } else {
         // TODO(sofia@git.sofiaritz.com): Is this the default value?

src/lib/utils.ts

@@ -28,14 +28,47 @@ function to_array(v) {
     }
 }
 
-function font_base_url(font, mirror) {
+function font_base_url(font, folder, mirror) {
-    return `${mirror}/ofl/${font}`
+    return `${mirror}/${folder}/${font}`
 }
 async function get_font_metadata(font, mirror) {
-    let response = await (await fetch(font_base_url(font, mirror) + "/METADATA.pb"))
+    let base_url
-        .text()
+    let response
+    // TODO(sofia@git.sofiaritz.com): Improve this re-trying logic. This feels wrong 😭
+    try {
+        base_url = font_base_url(font, "ofl", mirror)
+        let rresponse = await (await fetch(base_url + "/METADATA.pb"))
+        if (rresponse.ok) {
+            response = await rresponse.text()
+        } else {
+            throw new Error("Font not found.")
+        }
+    } catch (e) {
+        try {
+            base_url = font_base_url(font, "ufl", mirror)
+            let rresponse = await (await fetch(base_url + "/METADATA.pb"))
+            if (rresponse.ok) {
+                response = await rresponse.text()
+            } else {
+                throw new Error("Font not found.")
+            }
+        } catch (e) {
+            try {
+                base_url = font_base_url(font, "apache", mirror)
+                let rresponse = await (await fetch(base_url + "/METADATA.pb"))
+                if (rresponse.ok) {
+                    response = await rresponse.text()
+                } else {
+                    throw new Error("Font not found.")
+                }
+            } catch (e) {
+                console.error("Font not found.")
+                throw new Error(`"${font}" not found in mirror "${mirror}".`)
+            }
+        }
+    }
 
-    return parse(response)
+    return {base_url, parsed: parse(response)}
 }
 
 export async function css2_to_cssfile(css2_url, mirror): Promise<string> {
@@ -50,18 +83,18 @@ export async function css2_to_cssfile(css2_url, mirror): Promise<string> {
         .map(v => v.replace("?family=", ""))
         .map(parse_family)
         .map(async (v) => {
-            let metadata = await get_font_metadata(v.font, mirror)
+            let {base_url, parsed: metadata} = await get_font_metadata(v.font, mirror)
             let fonts = []
             for (let variant of v.variants) {
                 let { weight, style }: Variant = variant
                 let rfonts = to_array(metadata.fonts)
                 let matched = false
                 for (let font of rfonts) {
-                    if (font.weight === weight) {
+                    if (font.weight === weight && matched === false) {
                         if (style === "italic") {
                             fonts.push({
                                 name: metadata.name,
-                                path: font_base_url(v.font, mirror) + "/" + font.filename,
+                                path: base_url + "/" + font.filename,
                                 weight,
                                 style,
                             })
@@ -73,7 +106,7 @@ export async function css2_to_cssfile(css2_url, mirror): Promise<string> {
                 if (matched === false) {
                     fonts.push({
                         name: metadata.name,
-                        path: font_base_url(v.font, mirror) + "/" + rfonts[0].filename,
+                        path: base_url + "/" + rfonts[0].filename,
                         weight,
                         style,
                     })