Merge #3196

3196: Cleanup imports r=matklad a=matklad



Co-authored-by: Aleksey Kladov <[email protected]>

1 files changed, 153 insertions, 0 deletions

diff --git a/crates/ra_cli/src/load_cargo.rs b/crates/ra_cli/src/load_cargo.rs
new file mode 100644
index 000000000..2d6433f18
--- /dev/null
+++ b/crates/ra_cli/src/load_cargo.rs
@@ -0,0 +1,153 @@
+//! FIXME: write short doc here
+
+use std::{collections::HashSet, error::Error, path::Path};
+
+use rustc_hash::FxHashMap;
+
+use crossbeam_channel::{unbounded, Receiver};
+use ra_db::{CrateGraph, FileId, SourceRootId};
+use ra_ide::{AnalysisChange, AnalysisHost, FeatureFlags};
+use ra_project_model::{get_rustc_cfg_options, PackageRoot, ProjectWorkspace};
+use ra_vfs::{RootEntry, Vfs, VfsChange, VfsTask, Watch};
+use ra_vfs_glob::RustPackageFilterBuilder;
+
+type Result<T> = std::result::Result<T, Box<dyn Error + Send + Sync>>;
+
+fn vfs_file_to_id(f: ra_vfs::VfsFile) -> FileId {
+    FileId(f.0)
+}
+fn vfs_root_to_id(r: ra_vfs::VfsRoot) -> SourceRootId {
+    SourceRootId(r.0)
+}
+
+pub fn load_cargo(root: &Path) -> Result<(AnalysisHost, FxHashMap<SourceRootId, PackageRoot>)> {
+    let root = std::env::current_dir()?.join(root);
+    let ws = ProjectWorkspace::discover(root.as_ref(), &Default::default())?;
+    let project_roots = ws.to_roots();
+    let (sender, receiver) = unbounded();
+    let sender = Box::new(move |t| sender.send(t).unwrap());
+    let (mut vfs, roots) = Vfs::new(
+        project_roots
+            .iter()
+            .map(|pkg_root| {
+                RootEntry::new(
+                    pkg_root.path().clone(),
+                    RustPackageFilterBuilder::default()
+                        .set_member(pkg_root.is_member())
+                        .into_vfs_filter(),
+                )
+            })
+            .collect(),
+        sender,
+        Watch(false),
+    );
+
+    // FIXME: cfg options?
+    let default_cfg_options = {
+        let mut opts = get_rustc_cfg_options();
+        opts.insert_atom("test".into());
+        opts.insert_atom("debug_assertion".into());
+        opts
+    };
+
+    let (crate_graph, _crate_names) =
+        ws.to_crate_graph(&default_cfg_options, &mut |path: &Path| {
+            let vfs_file = vfs.load(path);
+            log::debug!("vfs file {:?} -> {:?}", path, vfs_file);
+            vfs_file.map(vfs_file_to_id)
+        });
+    log::debug!("crate graph: {:?}", crate_graph);
+
+    let source_roots = roots
+        .iter()
+        .map(|&vfs_root| {
+            let source_root_id = vfs_root_to_id(vfs_root);
+            let project_root = project_roots
+                .iter()
+                .find(|it| it.path() == &vfs.root2path(vfs_root))
+                .unwrap()
+                .clone();
+            (source_root_id, project_root)
+        })
+        .collect::<FxHashMap<_, _>>();
+    let host = load(&source_roots, crate_graph, &mut vfs, receiver);
+    Ok((host, source_roots))
+}
+
+pub fn load(
+    source_roots: &FxHashMap<SourceRootId, PackageRoot>,
+    crate_graph: CrateGraph,
+    vfs: &mut Vfs,
+    receiver: Receiver<VfsTask>,
+) -> AnalysisHost {
+    let lru_cap = std::env::var("RA_LRU_CAP").ok().and_then(|it| it.parse::<usize>().ok());
+    let mut host = AnalysisHost::new(lru_cap, FeatureFlags::default());
+    let mut analysis_change = AnalysisChange::new();
+    analysis_change.set_crate_graph(crate_graph);
+
+    // wait until Vfs has loaded all roots
+    let mut roots_loaded = HashSet::new();
+    for task in receiver {
+        vfs.handle_task(task);
+        let mut done = false;
+        for change in vfs.commit_changes() {
+            match change {
+                VfsChange::AddRoot { root, files } => {
+                    let source_root_id = vfs_root_to_id(root);
+                    let is_local = source_roots[&source_root_id].is_member();
+                    log::debug!(
+                        "loaded source root {:?} with path {:?}",
+                        source_root_id,
+                        vfs.root2path(root)
+                    );
+                    analysis_change.add_root(source_root_id, is_local);
+                    analysis_change.set_debug_root_path(
+                        source_root_id,
+                        source_roots[&source_root_id].path().display().to_string(),
+                    );
+
+                    let mut file_map = FxHashMap::default();
+                    for (vfs_file, path, text) in files {
+                        let file_id = vfs_file_to_id(vfs_file);
+                        analysis_change.add_file(source_root_id, file_id, path.clone(), text);
+                        file_map.insert(path, file_id);
+                    }
+                    roots_loaded.insert(source_root_id);
+                    if roots_loaded.len() == vfs.n_roots() {
+                        done = true;
+                    }
+                }
+                VfsChange::AddFile { root, file, path, text } => {
+                    let source_root_id = vfs_root_to_id(root);
+                    let file_id = vfs_file_to_id(file);
+                    analysis_change.add_file(source_root_id, file_id, path, text);
+                }
+                VfsChange::RemoveFile { .. } | VfsChange::ChangeFile { .. } => {
+                    // We just need the first scan, so just ignore these
+                }
+            }
+        }
+        if done {
+            break;
+        }
+    }
+
+    host.apply_change(analysis_change);
+    host
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    use hir::Crate;
+
+    #[test]
+    fn test_loading_rust_analyzer() {
+        let path = Path::new(env!("CARGO_MANIFEST_DIR")).parent().unwrap().parent().unwrap();
+        let (host, _roots) = load_cargo(path).unwrap();
+        let n_crates = Crate::all(host.raw_database()).len();
+        // RA has quite a few crates, but the exact count doesn't matter
+        assert!(n_crates > 20);
+    }
+}