Get the output directory and clear it.

src/command/build/runner.rs

@@ -1,3 +1,5 @@
+use std::path::PathBuf;
+
 use crate::blog_post::BlogPost;
 use crate::cli::parameters::BuildArgs;
 use crate::config::Config;
@@ -7,6 +9,7 @@ use walkdir::WalkDir;
 pub(crate) async fn build_site(args: BuildArgs) -> Result<(), CustomError> {
     let config = Config::load_from_file(args.config).await?;
     let root_directory = config.get_root_directory().to_owned();
+    let output_directory = get_output_directory(&config).await?;
     let post_directories = WalkDir::new(config.get_posts_directory())
         .into_iter()
         .filter(|e| match e {
@@ -26,3 +29,22 @@ pub(crate) async fn build_site(args: BuildArgs) -> Result<(), CustomError> {
     println!("{:?}", blog_posts);
     Ok(())
 }
+
+/// Delete everything inside the output directory and return the path to that directory.
+async fn get_output_directory(config: &Config) -> Result<PathBuf, CustomError> {
+    let output_directory = config.get_output_directory();
+    if !output_directory.exists() {
+        tokio::fs::create_dir(&output_directory).await?;
+    } else {
+        let mut existing_entries = tokio::fs::read_dir(&output_directory).await?;
+        while let Some(entry) = existing_entries.next_entry().await? {
+            let file_type = entry.file_type().await?;
+            if file_type.is_dir() {
+                tokio::fs::remove_dir_all(entry.path()).await?;
+            } else {
+                tokio::fs::remove_file(entry.path()).await?;
+            }
+        }
+    }
+    Ok(output_directory)
+}

src/config/full.rs

@@ -55,4 +55,8 @@ impl Config {
     pub(crate) fn get_posts_directory(&self) -> PathBuf {
         self.get_root_directory().join("posts")
     }
+
+    pub(crate) fn get_output_directory(&self) -> PathBuf {
+        self.get_root_directory().join("output")
+    }
 }