Add support for tectonic -X build (#901)

Add an option to override build filename

crates/base-db/src/config.rs

@@ -1,3 +1,4 @@
+use std::path::PathBuf;
 use std::time::Duration;
 
 use parser::SyntaxConfig;
@@ -22,6 +23,7 @@ pub struct BuildConfig {
  pub on_save: bool,
  pub forward_search_after: bool,
  pub output_dir: String,
+ pub output_filename: Option<PathBuf>,
 }
 
 #[derive(Debug)]
@@ -111,6 +113,7 @@ impl Default for BuildConfig {
  on_save: false,
  forward_search_after: false,
  output_dir: String::from("."),
+ output_filename: None,
  }
  }
 }

crates/commands/src/fwd_search.rs

@@ -65,8 +65,9 @@ impl ForwardSearch {
  return Err(ForwardSearchError::InvalidPath(child.uri.clone()));
  };
 
- let Some(pdf_path) = parent.path
- .as_deref()
+ let override_path = workspace.config().build.output_filename.as_deref();
+
+ let Some(pdf_path) = override_path.or(parent.path.as_deref())
  .and_then(Path::file_stem)
  .and_then(OsStr::to_str)
  .map(|stem| dir.join(format!("{stem}.pdf"))) else 

crates/texlab/src/server/options.rs

@@ -1,3 +1,4 @@
+use std::path::PathBuf;
 use std::time::Duration;
 
 use base_db::{Config, Formatter, SynctexConfig};
@@ -68,6 +69,7 @@ pub struct BuildOptions {
  pub args: Option<Vec<String>>,
  pub on_save: bool,
  pub forward_search_after: bool,
+ pub filename: Option<String>,
 }
 
 #[derive(Debug, PartialEq, Eq, Clone, Default, Serialize, Deserialize)]
@@ -154,6 +156,7 @@ impl From<Options> for Config {
  config.build.on_save = value.build.on_save;
  config.build.forward_search_after = value.build.forward_search_after;
  config.build.output_dir = value.aux_directory.unwrap_or_else(|| String::from("."));
+ config.build.output_filename = value.build.filename.map(PathBuf::from);
 
  config.diagnostics.allowed_patterns = value
  .diagnostics