strip blank lines from HTML

src/build/render.rs

@@ -1,10 +1,14 @@
 use config::Config;
+use std::char;
 
 use renderers::html_cleanup::html_cleanup;
+use renderers::strip_blank::strip_blank;
 
 pub fn render(config: Config, input: String) -> Result<String, String> {
     let mut rendered_input = input;
-    for renderer in vec![html_cleanup] {
+    let renderers: Vec<fn(Config, String) -> Result<String, String>> =
+        vec![html_cleanup, strip_blank];
+    for renderer in renderers {
         rendered_input = try!(renderer(config.clone(), rendered_input));
     }
     return Ok(rendered_input);

src/renderers/html_cleanup.rs

@@ -10,4 +10,3 @@ pub fn html_cleanup(config: Config, input: String) -> Result<String, String> {
     let html = get_html(root);
     return Ok(html);
 }
-

src/renderers/mod.rs

@@ -3,3 +3,4 @@ use config::Config;
 mod helpers;
 
 pub mod html_cleanup;
+pub mod strip_blank;

src/renderers/strip_blank.rs

@@ -0,0 +1,18 @@
+use std::char;
+use config::Config;
+
+fn remove_blank_lines(line: &&str) -> bool {
+    if line.is_empty() {
+        return false;
+    }
+    let whitespace_chars: Vec<&str> = line.matches(char::is_whitespace).collect();
+    if whitespace_chars.len() == line.len() {
+        return false;
+    }
+    return true;
+}
+
+pub fn strip_blank(config: Config, input: String) -> Result<String, String> {
+    let split: Vec<&str> = input.lines().filter(remove_blank_lines).collect();
+    return Ok(split.join("\n"));
+}