Use bibliographies from BIBINPUTS (#912)

See #493.

CHANGELOG.md

@@ -5,6 +5,12 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+## [Unreleased]
+
+### Added
+
+- Use bibliographies found in `BIBINPUTS` environment variable ([#493](https://github.com/latex-lsp/texlab/issues/493))
+
 ## [5.8.0] - 2023-07-30
 
 ### Added

crates/distro/src/file_name_db.rs

@@ -47,6 +47,10 @@ pub struct FileNameDB {
 }
 
 impl FileNameDB {
+    pub(crate) fn insert(&mut self, path: PathBuf) {
+        self.files.insert(DistroFile(path));
+    }
+
     pub fn get(&self, name: &str) -> Option<&Path> {
         self.files.get(name).map(|file| file.path())
     }

crates/distro/src/lib.rs

@@ -58,7 +58,7 @@ impl Distro {
             }
         };
 
-        let file_name_db = match kind {
+        let mut file_name_db = match kind {
             DistroKind::Texlive => {
                 let root_dirs = kpsewhich::root_directories()?;
                 FileNameDB::parse(&root_dirs, &mut texlive::read_database)?
@@ -70,6 +70,20 @@ impl Distro {
             DistroKind::Tectonic | DistroKind::Unknown => FileNameDB::default(),
         };
 
+        if let Some(bibinputs) = std::env::var_os("BIBINPUTS") {
+            for dir in std::env::split_paths(&bibinputs) {
+                if let Ok(entries) = std::fs::read_dir(dir) {
+                    for file in entries
+                        .flatten()
+                        .filter(|entry| entry.file_type().map_or(false, |ty| ty.is_file()))
+                        .map(|entry| entry.path())
+                    {
+                        file_name_db.insert(file);
+                    }
+                }
+            }
+        }
+
         Ok(Self { kind, file_name_db })
     }
 }