From b8fadf82a9cfb172300d8fbdb9ef144e6dc30152 Mon Sep 17 00:00:00 2001
From: Jake Howard <git@theorangeone.net>
Date: Sat, 2 Sep 2017 10:13:57 +0100
Subject: [PATCH] only render PDF if needed

---
 src/config/validate.rs | 3 +++
 src/output/mod.rs      | 8 +++++---
 2 files changed, 8 insertions(+), 3 deletions(-)

diff --git a/src/config/validate.rs b/src/config/validate.rs
index 19f1f90..040224d 100644
--- a/src/config/validate.rs
+++ b/src/config/validate.rs
@@ -30,6 +30,9 @@ fn check_input_files(config: Value) -> ValidationResult {
 fn check_output_files(config: Value) -> ValidationResult {
     let files = read::get_output_files(config);
     let output_types = vec!["pdf".into()];
+    if files.is_empty() {
+        return Err("You need to provide at least 1 output format".into());
+    }
     for file_def in files.iter() {
         let dir = file_def.1.parent().unwrap();
         if !dir.exists() || !dir.is_dir() {
diff --git a/src/output/mod.rs b/src/output/mod.rs
index cfa2640..cae7fe4 100644
--- a/src/output/mod.rs
+++ b/src/output/mod.rs
@@ -2,7 +2,9 @@ use config::Config;
 
 pub mod pdf;
 
-pub fn output(config: Config, output: String) -> Result<String, String> {
-    pdf::output(config, output);
-    return Ok("".into());
+pub fn output(config: Config, output: String) -> Result<(), String> {
+    if config.output.contains_key("pdf") {
+        try!(pdf::output(config, output));
+    }
+    return Ok(());
 }