implement support for filesystem extractor mechanism

src/extractors.rs

@@ -0,0 +1,20 @@
+use crate::context::SproutContext;
+use crate::extractors::filesystem::FileSystemExtractorConfiguration;
+use anyhow::{Result, bail};
+use serde::{Deserialize, Serialize};
+use std::rc::Rc;
+
+pub mod filesystem;
+
+#[derive(Serialize, Deserialize, Default, Clone)]
+pub struct ExtractorDeclaration {
+    pub filesystem: Option<FileSystemExtractorConfiguration>,
+}
+
+pub fn extract(context: Rc<SproutContext>, extractor: &ExtractorDeclaration) -> Result<String> {
+    if let Some(filesystem) = &extractor.filesystem {
+        filesystem::extract(context, filesystem)
+    } else {
+        bail!("unknown extractor configuration");
+    }
+}