Default to site.url

Close #81.

README.md

@@ -100,10 +100,10 @@ redirect_from: /post/123456798/
 ```
 
 ### Prefix
-If `site.baseurl` is set, its value is used as a prefix for the redirect url automatically.
-This is useful for scenarios where a site isn't available from the domain root, so the redirects point to the correct path.
 
-**_Note_**: If you are hosting your Jekyll site on [GitHub Pages](https://pages.github.com/), the prefix is set to the pages domain name i.e. `http://example.github.io/project` or a custom `CNAME`.
+If `site.url` is set, its value, together with `site.baseurl`, is used as a prefix for the redirect url automatically. This is useful for scenarios where a site isn't available from the domain root, so the redirects point to the correct path. If `site.url` is not set, only `site.baseurl` is used, if set.
+
+**_Note_**: If you are hosting your Jekyll site on [GitHub Pages](https://pages.github.com/), and `site.url` is not set, the prefix is set to the pages domain name i.e. http://example.github.io/project or a custom CNAME.
 
 ### Redirect To
 

lib/jekyll-redirect-from/redirector.rb

@@ -71,7 +71,13 @@ def redirect_url(site, item)
     end
 
     def redirect_prefix(site)
-      config_github_url(site) || config_url(site)
+      config_url_and_baseurl(site) || config_github_url(site) || config_baseurl(site) || ""
+    end
+
+    def config_url_and_baseurl(site)
+      return nil unless config_url(site)
+
+      File.join(config_url(site), config_baseurl(site).to_s)
     end
 
     def config_github_url(site)
@@ -82,9 +88,11 @@ def config_github_url(site)
     end
 
     def config_url(site)
-      url = site.config.fetch('url', nil) || ""
-      baseurl = site.config.fetch('baseurl', nil) || ""
-      File.join url, baseurl
+      site.config.fetch('url', nil)
+    end
+
+    def config_baseurl(site)
+      site.config.fetch('baseurl', nil)
     end
   end
 end

spec/jekyll_redirect_from/redirector_spec.rb

@@ -106,13 +106,17 @@
   end
 
   context "prefix" do
-    it "uses site.url as the redirect prefix when site.github.url is not set" do
-      @site.config['url'] = "http://notgithub.io"
-      @site.config['baseurl'] = nil
-      expect(redirector.redirect_url(@site, page_with_one)).to eql("http://notgithub.io/one_redirect_url.html")
+    it "uses site.url as the redirect prefix" do
+      expect(redirector.redirect_url(@site, page_with_one)).to eql("http://jekyllrb.com/one_redirect_url.html")
     end
 
-    it "uses site.baseurl as the redirect prefix when site.github.url is not set" do
+    it "uses site.github.url as the redirect prefix when site.url is not set" do
+      @site.config['url'] = nil
+      @site.config['github'] = { "url" => "http://example.github.io/test" }
+      expect(redirector.redirect_url(@site, page_with_one)).to eql("http://example.github.io/test/one_redirect_url.html")
+    end
+
+    it "uses site.baseurl as the redirect prefix when both site.url and site.github.url is not set" do
       @site.config['url'] = nil
       @site.config['baseurl'] = "/fancy/prefix"
       expect(redirector.redirect_url(@site, page_with_one)).to eql("/fancy/prefix/one_redirect_url.html")
@@ -124,14 +128,22 @@
       expect(redirector.redirect_url(@site, page_with_one)).to eql("http://notgithub.io/fancy/prefix/one_redirect_url.html")
     end
 
-    it "prefers site.github.url over site.url or site.baseurl" do
+    it "prefers site.url + site.baseurl over site.github.url" do
       @site.config['url'] = "http://notgithub.io"
       @site.config['baseurl'] = "/fancy/prefix"
       @site.config['github'] = { "url" => "http://example.github.io/test" }
+      expect(redirector.redirect_url(@site, page_with_one)).to eql("http://notgithub.io/fancy/prefix/one_redirect_url.html")
+    end
+
+    it "prefers site.github.url over site.baseurl when site.url is not set" do
+      @site.config['url'] = nil
+      @site.config['github'] = { "url" => "http://example.github.io/test" }
+      @site.config['baseurl'] = "/fancy/baseurl"
       expect(redirector.redirect_url(@site, page_with_one)).to eql("http://example.github.io/test/one_redirect_url.html")
     end
 
     it "converts non-string values in site.github.url to strings" do
+      @site.config['url'] = nil
       @site.config['github'] = { "url" => TestStringContainer.new("http://example.github.io/test") }
       expect(redirector.redirect_url(@site, page_with_one)).to eql("http://example.github.io/test/one_redirect_url.html")
     end
@@ -145,5 +157,15 @@
       @site.config['url'] = nil
       expect(redirector.redirect_url(@site, page_with_one)).to eql("/one_redirect_url.html")
     end
+
+    it "should handle site.baseurl being nil" do
+      @site.config['baseurl'] = nil
+      expect(redirector.redirect_url(@site, page_with_one)).to eql("http://jekyllrb.com/one_redirect_url.html")
+    end
+
+    it "no-ops when site.url is empty" do
+      @site.config['url'] = ""
+      expect(redirector.redirect_url(@site, page_with_one)).to eql("/one_redirect_url.html")
+    end
   end
 end