Use rootDirectory setting to resolve output files

Cargo.lock

@@ -2156,6 +2156,7 @@ name = "texlab-protocol"
 version = "0.1.0"
 dependencies = [
  "bytes 0.5.4 (registry+https://github.com/rust-lang/crates.io-index)",
+ "dunce 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "futures 0.3.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "futures-boxed 0.1.0",
  "jsonrpc 0.1.0",

crates/texlab_protocol/Cargo.toml

@@ -8,6 +8,7 @@ edition = "2018"
 
 [dependencies]
 bytes = "0.5"
+dunce = "1.0"
 futures = "0.3"
 futures-boxed = { path = "../futures_boxed" }
 jsonrpc = { path = "../jsonrpc" }

crates/texlab_protocol/src/options.rs

@@ -88,12 +88,25 @@ impl Options {
     pub fn resolve_output_file(&self, tex_path: &Path, extension: &str) -> Option<PathBuf> {
         let stem = tex_path.file_stem()?.to_str()?;
         let name = format!("{}.{}", stem, extension);
-        let output_directory = self
-            .latex
+
+        self.latex
             .as_ref()
             .and_then(|latex| latex.build.as_ref())
-            .and_then(|build| build.output_directory.clone())
-            .unwrap_or_else(|| PathBuf::from("."));
-        Some(tex_path.parent()?.join(output_directory).join(name))
+            .and_then(|build| build.output_directory.as_ref())
+            .map(|path| path.join(&name))
+            .and_then(|path| dunce::canonicalize(path).ok())
+            .or_else(|| {
+                self.latex
+                    .as_ref()
+                    .and_then(|latex| latex.root_directory.as_ref())
+                    .map(|path| path.join(&name))
+                    .and_then(|path| dunce::canonicalize(path).ok())
+            })
+            .or_else(|| {
+                tex_path
+                    .parent()
+                    .map(|path| path.join(&name))
+                    .and_then(|path| dunce::canonicalize(path).ok())
+            })
     }
 }