add ability to include file as data

src/includes.rs

@@ -0,0 +1,31 @@
+use std::fs::File;
+use std::io::prelude::*;
+use std::path::Path;
+
+use crate::ast;
+use anyhow::{anyhow, Result};
+
+pub fn resolve_includes(script: &mut ast::Script, path: &Path) -> Result<()> {
+    let script_dir = path.parent().expect("Script path has no parent");
+    for data in &mut script.data {
+        for values in &mut data.data {
+            match values {
+                ast::DataValues::File {
+                    ref path,
+                    ref mut data,
+                } => {
+                    let mut full_path = script_dir.to_path_buf();
+                    full_path.push(path);
+                    File::open(&full_path)
+                        .map_err(|e| {
+                            anyhow!("Failed to load data from {}: {}", full_path.display(), e)
+                        })?
+                        .read_to_end(data)?;
+                }
+                _ => (),
+            }
+        }
+    }
+
+    Ok(())
+}