Introduce the file_listing.

* Fixes #2 Generate MarkdownFile listing.
* Starts #3 markdown compiler .
* Starts #4 html assembler.

Cargo.lock

@@ -1,6 +1,385 @@
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Cargo.toml

@@ -7,6 +7,4 @@ edition = "2018"
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
 [dependencies]
-maud = "*"
-pulldown-cmark = "*"
-syntect = "3.0"
+comrak = "0.7"

src/main.rs

@@ -1,4 +1,117 @@
-fn main() {
-    // Layout of site
-    println!("Hello, world!");
+use std::path::Path;
+use std::{fs, vec::Vec};
+
+use comrak::{markdown_to_html, ComrakOptions};
+
+fn list_markdown_files(path: &Path) -> Vec<String> {
+    let mut files = Vec::<String>::new();
+    let dir_entries = fs::read_dir(path);
+
+    match dir_entries {
+        Ok(dir) => {
+            for entry in dir {
+                match entry {
+                    Ok(entry) => {
+                        if entry.file_type().unwrap().is_dir() {
+                            let mut recursively_obtained = list_markdown_files(&entry.path());
+                            files.append(&mut recursively_obtained);
+                        } else {
+                            let path = entry.path();
+                            let extension_wrapped = path.extension();
+
+                            match extension_wrapped {
+                                Some(extension) => {
+                                    if extension == "md" {
+                                        files.push(entry.path().to_str().expect("Couldn't use file path.").to_owned());
+                                    }
+                                },
+                                None => {}
+                            }
+                        }
+                    },
+                    Err(_) => {
+                        println!("Invalid entry found.");
+                    }
+                }
+            }
+        },
+        Err(err) => {
+            println!("Error while opening directory: {}", err.to_string());
+        }
+    }
+
+    files
 }
+
+fn md_to_html(file: String) -> Result<String, String> {
+    let content = fs::read_to_string(file);
+
+    match content {
+        Ok(content) => Ok(markdown_to_html(&content, &ComrakOptions::default())),
+        Err(err) => Err(err.to_string())
+    }
+}
+
+#[cfg(test)]
+mod tests_listing {
+    use std::env;
+    use std::path::Path;
+    use crate::list_markdown_files;
+
+    #[test]
+    fn list_files_recursively() {
+        let directory_path = env::var("TEST_DIRECTORY_PATH").unwrap_or("".to_owned());
+        let files_list = list_markdown_files(Path::new(&directory_path));
+
+        assert_eq!(files_list.len(), 2);
+    }
+
+    #[test]
+    fn on_nonexistant_dir_empty_list() {
+        let files_list = list_markdown_files(Path::new("/usr/fake/path"));
+
+        assert_eq!(files_list.len(), 0);
+    }
+}
+
+fn main() -> Result<(), Box<dyn std::error::Error + 'static>> {
+    let files = list_markdown_files(Path::new(""));
+    let base_directory = "";
+    let header_path = format!("{}/header.html", base_directory);
+    let header_path = Path::new(&header_path);
+    let footer_path = format!("{}/footer.html", base_directory);
+    let footer_path = Path::new(&footer_path);
+
+    if !header_path.exists() {
+        println!("[warning] No header.html found.");
+    }
+
+    if footer_path.exists() {
+        println!("[warning] No footer.html found.");
+    }
+
+    let header_content = fs::read_to_string(header_path)?;
+    let footer_content = fs::read_to_string(footer_path)?;
+
+    // TODO:
+    // 1. Get working directory from args program -d <input_directory> -o <output_directory>
+    // 2. Get relative paths from input_directory. e.g.: /this/is/folder/[get/this/part/only]
+    //    to be able to construct same relative paths in output.
+    // 3. Convert content to new content and save file. (md_to_html should do it)
+    //
+
+    for file in files {
+
+        let html_content = md_to_html(file)?;
+        let assembled = format!("{}{}{}", header_content, html_content, footer_content);
+
+        if fs::write(Path::new(base_directory), assembled).is_err() {
+            println!("Couldn't not write to file.");
+        }
+
+        // Minification of HTML?
+    }
+
+    Ok(())
+}
+