3 files changed, 118 insertions, 16 deletions

diff --git a/crates/ra_db/src/fixture.rs b/crates/ra_db/src/fixture.rs
index 947d6ad56..3dc86ca2d 100644
--- a/crates/ra_db/src/fixture.rs
+++ b/crates/ra_db/src/fixture.rs
@@ -5,7 +5,7 @@ use std::sync::Arc;
 
 use ra_cfg::CfgOptions;
 use rustc_hash::FxHashMap;
-use test_utils::{extract_offset, parse_fixture, CURSOR_MARKER};
+use test_utils::{extract_offset, parse_fixture, parse_single_fixture, CURSOR_MARKER};
 
 use crate::{
     input::CrateName, CrateGraph, CrateId, Edition, Env, FileId, FilePosition, RelativePathBuf,
@@ -45,23 +45,45 @@ pub trait WithFixture: Default + SourceDatabaseExt + 'static {
 
 impl<DB: SourceDatabaseExt + Default + 'static> WithFixture for DB {}
 
-fn with_single_file(db: &mut dyn SourceDatabaseExt, text: &str) -> FileId {
+fn with_single_file(db: &mut dyn SourceDatabaseExt, ra_fixture: &str) -> FileId {
     let file_id = FileId(0);
     let rel_path: RelativePathBuf = "/main.rs".into();
 
     let mut source_root = SourceRoot::new_local();
     source_root.insert_file(rel_path.clone(), file_id);
 
-    let mut crate_graph = CrateGraph::default();
-    crate_graph.add_crate_root(
-        file_id,
-        Edition::Edition2018,
-        None,
-        CfgOptions::default(),
-        Env::default(),
-    );
-
-    db.set_file_text(file_id, Arc::new(text.to_string()));
+    let fixture = parse_single_fixture(ra_fixture);
+
+    let crate_graph = if let Some(entry) = fixture {
+        let meta = match parse_meta(&entry.meta) {
+            ParsedMeta::File(it) => it,
+            _ => panic!("with_single_file only support file meta"),
+        };
+
+        let mut crate_graph = CrateGraph::default();
+        crate_graph.add_crate_root(
+            file_id,
+            meta.edition,
+            meta.krate,
+            meta.cfg,
+            meta.env,
+            Default::default(),
+        );
+        crate_graph
+    } else {
+        let mut crate_graph = CrateGraph::default();
+        crate_graph.add_crate_root(
+            file_id,
+            Edition::Edition2018,
+            None,
+            CfgOptions::default(),
+            Env::default(),
+            Default::default(),
+        );
+        crate_graph
+    };
+
+    db.set_file_text(file_id, Arc::new(ra_fixture.to_string()));
     db.set_file_relative_path(file_id, rel_path);
     db.set_file_source_root(file_id, WORKSPACE);
     db.set_source_root(WORKSPACE, Arc::new(source_root));
@@ -104,7 +126,8 @@ fn with_files(db: &mut dyn SourceDatabaseExt, fixture: &str) -> Option<FilePosit
                 meta.edition,
                 Some(krate.clone()),
                 meta.cfg,
-                Env::default(),
+                meta.env,
+                Default::default(),
             );
             let prev = crates.insert(krate.clone(), crate_id);
             assert!(prev.is_none());
@@ -141,6 +164,7 @@ fn with_files(db: &mut dyn SourceDatabaseExt, fixture: &str) -> Option<FilePosit
             None,
             CfgOptions::default(),
             Env::default(),
+            Default::default(),
         );
     } else {
         for (from, to) in crate_deps {
@@ -167,9 +191,10 @@ struct FileMeta {
     deps: Vec<String>,
     cfg: CfgOptions,
     edition: Edition,
+    env: Env,
 }
 
-//- /lib.rs crate:foo deps:bar,baz
+//- /lib.rs crate:foo deps:bar,baz cfg:foo=a,bar=b env:OUTDIR=path/to,OTHER=foo)
 fn parse_meta(meta: &str) -> ParsedMeta {
     let components = meta.split_ascii_whitespace().collect::<Vec<_>>();
 
@@ -186,6 +211,7 @@ fn parse_meta(meta: &str) -> ParsedMeta {
     let mut deps = Vec::new();
     let mut edition = Edition::Edition2018;
     let mut cfg = CfgOptions::default();
+    let mut env = Env::default();
     for component in components[1..].iter() {
         let (key, value) = split1(component, ':').unwrap();
         match key {
@@ -200,11 +226,18 @@ fn parse_meta(meta: &str) -> ParsedMeta {
                     }
                 }
             }
+            "env" => {
+                for key in value.split(',') {
+                    if let Some((k, v)) = split1(key, '=') {
+                        env.set(k.into(), v.into());
+                    }
+                }
+            }
             _ => panic!("bad component: {:?}", component),
         }
     }
 
-    ParsedMeta::File(FileMeta { path, krate, deps, edition, cfg })
+    ParsedMeta::File(FileMeta { path, krate, deps, edition, cfg, env })
 }
 
 fn split1(haystack: &str, delim: char) -> Option<(&str, &str)> {
diff --git a/crates/ra_db/src/input.rs b/crates/ra_db/src/input.rs
index b77640b2b..06d40db96 100644
--- a/crates/ra_db/src/input.rs
+++ b/crates/ra_db/src/input.rs
@@ -113,6 +113,7 @@ pub struct CrateData {
     pub display_name: Option<String>,
     pub cfg_options: CfgOptions,
     pub env: Env,
+    pub extern_source: ExternSource,
     pub dependencies: Vec<Dependency>,
 }
 
@@ -122,11 +123,22 @@ pub enum Edition {
     Edition2015,
 }
 
+#[derive(Debug, Clone, Copy, PartialEq, Eq, PartialOrd, Ord, Hash)]
+pub struct ExternSourceId(pub u32);
+
 #[derive(Default, Debug, Clone, PartialEq, Eq)]
 pub struct Env {
     entries: FxHashMap<String, String>,
 }
 
+// FIXME: Redesign vfs for solve the following limitation ?
+// Note: Some env variables (e.g. OUT_DIR) are located outside of the
+// crate. We store a map to allow remap it to ExternSourceId
+#[derive(Default, Debug, Clone, PartialEq, Eq)]
+pub struct ExternSource {
+    extern_paths: FxHashMap<String, ExternSourceId>,
+}
+
 #[derive(Debug, Clone, PartialEq, Eq)]
 pub struct Dependency {
     pub crate_id: CrateId,
@@ -141,6 +153,7 @@ impl CrateGraph {
         display_name: Option<String>,
         cfg_options: CfgOptions,
         env: Env,
+        extern_source: ExternSource,
     ) -> CrateId {
         let data = CrateData {
             root_file_id: file_id,
@@ -148,6 +161,7 @@ impl CrateGraph {
             display_name,
             cfg_options,
             env,
+            extern_source,
             dependencies: Vec::new(),
         };
         let crate_id = CrateId(self.arena.len() as u32);
@@ -261,6 +275,37 @@ impl fmt::Display for Edition {
     }
 }
 
+impl Env {
+    pub fn set(&mut self, env: &str, value: String) {
+        self.entries.insert(env.to_owned(), value);
+    }
+
+    pub fn get(&self, env: &str) -> Option<String> {
+        self.entries.get(env).cloned()
+    }
+}
+
+impl ExternSource {
+    pub fn extern_path(&self, path: &str) -> Option<(ExternSourceId, RelativePathBuf)> {
+        self.extern_paths.iter().find_map(|(root_path, id)| {
+            if path.starts_with(root_path) {
+                let mut rel_path = &path[root_path.len()..];
+                if rel_path.starts_with("/") {
+                    rel_path = &rel_path[1..];
+                }
+                let rel_path = RelativePathBuf::from_path(rel_path).ok()?;
+                Some((id.clone(), rel_path))
+            } else {
+                None
+            }
+        })
+    }
+
+    pub fn set_extern_path(&mut self, root_path: &str, root: ExternSourceId) {
+        self.extern_paths.insert(root_path.to_owned(), root);
+    }
+}
+
 #[derive(Debug)]
 pub struct ParseEditionError {
     invalid_input: String,
@@ -290,6 +335,7 @@ mod tests {
             None,
             CfgOptions::default(),
             Env::default(),
+            Default::default(),
         );
         let crate2 = graph.add_crate_root(
             FileId(2u32),
@@ -297,6 +343,7 @@ mod tests {
             None,
             CfgOptions::default(),
             Env::default(),
+            Default::default(),
         );
         let crate3 = graph.add_crate_root(
             FileId(3u32),
@@ -304,6 +351,7 @@ mod tests {
             None,
             CfgOptions::default(),
             Env::default(),
+            Default::default(),
         );
         assert!(graph.add_dep(crate1, CrateName::new("crate2").unwrap(), crate2).is_ok());
         assert!(graph.add_dep(crate2, CrateName::new("crate3").unwrap(), crate3).is_ok());
@@ -319,6 +367,7 @@ mod tests {
             None,
             CfgOptions::default(),
             Env::default(),
+            Default::default(),
         );
         let crate2 = graph.add_crate_root(
             FileId(2u32),
@@ -326,6 +375,7 @@ mod tests {
             None,
             CfgOptions::default(),
             Env::default(),
+            Default::default(),
         );
         let crate3 = graph.add_crate_root(
             FileId(3u32),
@@ -333,6 +383,7 @@ mod tests {
             None,
             CfgOptions::default(),
             Env::default(),
+            Default::default(),
         );
         assert!(graph.add_dep(crate1, CrateName::new("crate2").unwrap(), crate2).is_ok());
         assert!(graph.add_dep(crate2, CrateName::new("crate3").unwrap(), crate3).is_ok());
@@ -347,6 +398,7 @@ mod tests {
             None,
             CfgOptions::default(),
             Env::default(),
+            Default::default(),
         );
         let crate2 = graph.add_crate_root(
             FileId(2u32),
@@ -354,6 +406,7 @@ mod tests {
             None,
             CfgOptions::default(),
             Env::default(),
+            Default::default(),
         );
         assert!(graph
             .add_dep(crate1, CrateName::normalize_dashes("crate-name-with-dashes"), crate2)
diff --git a/crates/ra_db/src/lib.rs b/crates/ra_db/src/lib.rs
index fb002d717..d500d5e85 100644
--- a/crates/ra_db/src/lib.rs
+++ b/crates/ra_db/src/lib.rs
@@ -11,7 +11,8 @@ use ra_syntax::{ast, Parse, SourceFile, TextRange, TextUnit};
 pub use crate::{
     cancellation::Canceled,
     input::{
-        CrateGraph, CrateId, CrateName, Dependency, Edition, Env, FileId, SourceRoot, SourceRootId,
+        CrateGraph, CrateId, CrateName, Dependency, Edition, Env, ExternSource, ExternSourceId,
+        FileId, SourceRoot, SourceRootId,
     },
 };
 pub use relative_path::{RelativePath, RelativePathBuf};
@@ -87,6 +88,12 @@ pub trait FileLoader {
     fn resolve_relative_path(&self, anchor: FileId, relative_path: &RelativePath)
         -> Option<FileId>;
     fn relevant_crates(&self, file_id: FileId) -> Arc<Vec<CrateId>>;
+
+    fn resolve_extern_path(
+        &self,
+        extern_id: ExternSourceId,
+        relative_path: &RelativePath,
+    ) -> Option<FileId>;
 }
 
 /// Database which stores all significant input facts: source code and project
@@ -164,4 +171,13 @@ impl<T: SourceDatabaseExt> FileLoader for FileLoaderDelegate<&'_ T> {
         let source_root = self.0.file_source_root(file_id);
         self.0.source_root_crates(source_root)
     }
+
+    fn resolve_extern_path(
+        &self,
+        extern_id: ExternSourceId,
+        relative_path: &RelativePath,
+    ) -> Option<FileId> {
+        let source_root = self.0.source_root(SourceRootId(extern_id.0));
+        source_root.file_by_relative_path(&relative_path)
+    }
 }