Move common script logic to lib.js

extension/script/docs-rs.js

@@ -1,25 +1,5 @@
 let [_, _crateVersion, crateName] = location.pathname.slice(1).split("/");
 
-async function parseCargoFeatures(url) {
-    let features = [];
-    let response = await fetch(url);
-    let page = await response.text();
-    let start = page.lastIndexOf("[features]");
-    if (start !== -1) {
-        let lines = page.slice(start + "[features]\n".length).split("\n");
-        for (let line of lines) {
-            if (/.* = \[.*]/g.test(line)) {
-                let [name, flags] = line.split("=");
-                flags = flags.trim().replace(/"/ig, "");
-                features.push([name, flags]);
-            } else {
-                break;
-            }
-        }
-    }
-    return features;
-}
-
 document.addEventListener("DOMContentLoaded", async () => {
     let ul = document.querySelector(".landing-search-form-nav>ul");
     let childrenNumber = ul.children.length;
@@ -34,7 +14,8 @@ document.addEventListener("DOMContentLoaded", async () => {
 async function insertFeatureFlagsElement(number) {
     let sourceLink = document.querySelector(`.landing-search-form-nav>ul>li:nth-child(${number - 1})>a`);
 
-    let features = await parseCargoFeatures(sourceLink.href + "Cargo.toml");
+    let response = await fetch(sourceLink.href + "Cargo.toml");
+    let features = await parseCargoFeatures(await response.text());
     let html = `<div style="padding: 1rem"><p>This crate has no feature flag.</p></div>`;
     if (features.length > 0) {
         let tbody = features.map(([name, flags]) => {
@@ -101,21 +82,6 @@ function insertAddToExtensionElement(added) {
     platformElement.insertAdjacentElement("afterend", li);
 }
 
-function injectScripts(paths) {
-    paths.map(path => {
-        let script = document.createElement("script");
-        script.src = chrome.runtime.getURL(path);
-        script.onload = () => {
-            // Remove self after loaded
-            script.remove();
-        };
-        return script;
-    }).forEach(script => {
-        document.body.insertAdjacentElement('beforeBegin', script);
-    });
-}
-
-
 window.addEventListener("message", function(event) {
     if (event.source === window &&
         event.data &&

extension/script/lib.js

@@ -0,0 +1,32 @@
+async function parseCargoFeatures(content) {
+    let features = [];
+
+    let start = content.lastIndexOf("[features]");
+    if (start !== -1) {
+        let lines = content.slice(start + "[features]\n".length).split("\n");
+        for (let line of lines) {
+            if (/.* = \[.*]/g.test(line)) {
+                let [name, flags] = line.split("=");
+                flags = flags.trim().replace(/"/ig, "");
+                features.push([name.trim(), flags]);
+            } else {
+                break;
+            }
+        }
+    }
+    return features;
+}
+
+function injectScripts(paths) {
+    paths.map(path => {
+        let script = document.createElement("script");
+        script.src = chrome.runtime.getURL(path);
+        script.onload = () => {
+            // Remove self after loaded
+            script.remove();
+        };
+        return script;
+    }).forEach(script => {
+        document.body.insertAdjacentElement('beforeBegin', script);
+    });
+}

manifest.jsonnet

@@ -24,7 +24,7 @@ local manifest = {
             matches: [
               "*://docs.rs/*"
             ],
-            js: js_files("script", ["docs-rs"]),
+            js: js_files("script", ["lib", "docs-rs"]),
             css: ["script/docs-rs.css"],
             run_at: "document_start"
       }],