#468 encourage stable version

app/routes/crate/version.js

@@ -10,9 +10,49 @@ export default Ember.Route.extend({
         const controller = this.controllerFor(this.routeName);
         const maxVersion = crate.get('max_version');
 
-        // Fall back to the crate's `max_version` property
+        const isUnstableVersion = version => {
+            const versionLen = version.length;
+            let majorMinorPatchChars = 0;
+            let result = false;
+
+            for (let i = 0; i < versionLen; i++) {
+                const char = version.charAt(i);
+
+                if (!isNaN(parseInt(char)) || char === '.') {
+                    majorMinorPatchChars++;
+                } else {
+                    break;
+                }
+            }
+
+            if (versionLen !== majorMinorPatchChars) {
+                result = true;
+            }
+
+            return result;
+        };
+
+        // Fallback to the crate's last stable version
+        // If `max_version` is `0.0.0` then all versions have been yanked
         if (!requestedVersion && maxVersion !== '0.0.0') {
-            params.version_num = maxVersion;
+            if (isUnstableVersion(maxVersion)) {
+                crate.get('versions').then(versions => {
+                    const latestStableVersion = versions.find(version => {
+                        if (!isUnstableVersion(version.get('num'))) {
+                            return version;
+                        }
+                    });
+
+                    if (latestStableVersion == null) {
+                        // If no stable version exists, fallback to `maxVersion`
+                        params.version_num = maxVersion;
+                    } else {
+                        params.version_num = latestStableVersion.get('num');
+                    }
+                });
+            } else {
+                params.version_num = maxVersion;
+            }
         }
 
         controller.set('crate', crate);

mirage/fixtures/crate.js

@@ -20,11 +20,12 @@ export default {
             "version_downloads": "/api/v1/crates/nanomsg/downloads",
             "versions": null
         },
-        "max_version": "0.6.1",
+        "max_version": "0.7.0-alpha",
         "name": "nanomsg",
         "repository": "https://github.com/thehydroimpulse/nanomsg.rs",
-        "updated_at": "2016-12-27T08:40:00Z",
+        "updated_at": "2016-12-28T08:40:00Z",
         "versions": [
+            40906,
             40905,
             28431,
             21273,
@@ -48,6 +49,26 @@ export default {
         }
     ],
     "versions": [
+        {
+            "crate": "nanomsg",
+            "created_at": "2016-12-28T08:40:00Z",
+            "dl_path": "/api/v1/crates/nanomsg/0.7.0-alpha/download",
+            "downloads": 260,
+            "features": {
+                "bundled": [
+                    "nanomsg-sys/bundled"
+                ]
+            },
+            "id": 40906,
+            "links": {
+                "authors": "/api/v1/crates/nanomsg/0.7.0-alpha/authors",
+                "dependencies": "/api/v1/crates/nanomsg/0.7.0-alpha/dependencies",
+                "version_downloads": "/api/v1/crates/nanomsg/0.7.0-alpha/downloads"
+            },
+            "num": "0.7.0-alpha",
+            "updated_at": "2016-12-28T08:40:00Z",
+            "yanked": false
+        },
         {
             "crate": "nanomsg",
             "created_at": "2016-12-27T08:40:00Z",

tests/acceptance/crate-test.js

@@ -27,7 +27,7 @@ test('navigating to the all versions page', function(assert) {
     click('#crate-versions span.small a');
 
     andThen(function() {
-        matchesText(assert, '.info', /All 12 versions of nanomsg since December \d+, 2014/);
+        matchesText(assert, '.info', /All 13 versions of nanomsg since December \d+, 2014/);
     });
 });