Validate output formats

src/config/validate.rs

@@ -16,7 +16,12 @@ fn check_required_keys(config: &Value) -> ValidationResult {
 }
 
 fn check_input_files(config: &Value) -> ValidationResult {
+    match config.get("input").unwrap() {
+        &Value::Sequence(_) => (),
+        _ => return Err("Input must be sequence".into())
+    }
     let files = read::get_input_files(config);
+
     for file in files.iter() {
         if !file.exists() || !file.is_file() {
             return Err(format!("Cannot find input file at {}.", file.as_path().display()));
@@ -25,6 +30,24 @@ fn check_input_files(config: &Value) -> ValidationResult {
     return Ok(());
 }
 
+fn check_output_files(config: &Value) -> ValidationResult {
+    match config.get("output").unwrap() {
+        &Value::Mapping(_) => (),
+        _ => return Err("Output must be mapping".into())
+    }
+    let files = read::get_output_files(config);
+    let output_types = vec!["pdf".into()];
+    for file_def in files.iter() {
+        let dir = file_def.1.parent().unwrap();
+        if !dir.exists() || !dir.is_dir() {
+            return Err(format!("Cannot find output directory at {}.", dir.display()));
+        }
+        if !output_types.contains(file_def.0) {
+            return Err(format!("Invalid output type {}.", file_def.0));
+        }
+    }
+    return Ok(());
+}
 
 pub fn unwrap_group(
     config: &Value,
@@ -41,5 +64,5 @@ pub fn unwrap_group(
 
 
 pub fn validate(config: &Value) -> ValidationResult {
-    return unwrap_group(config, vec![&check_required_keys, &check_input_files]);
+    return unwrap_group(config, vec![&check_required_keys, &check_input_files, &check_output_files]);
 }