various wasi related improvements

src/DocumentStore.zig

@@ -23,8 +23,8 @@ config: Config,
 lock: std.Thread.RwLock = .{},
 thread_pool: if (builtin.single_threaded) void else *std.Thread.Pool,
 handles: std.StringArrayHashMapUnmanaged(*Handle) = .empty,
-build_files: std.StringArrayHashMapUnmanaged(*BuildFile) = .empty,
-cimports: std.AutoArrayHashMapUnmanaged(Hash, translate_c.Result) = .empty,
+build_files: if (supports_build_system) std.StringArrayHashMapUnmanaged(*BuildFile) else void = if (supports_build_system) .empty else {},
+cimports: if (supports_build_system) std.AutoArrayHashMapUnmanaged(Hash, translate_c.Result) else void = if (supports_build_system) .empty else {},
 diagnostics_collection: *DiagnosticsCollection,
 builds_in_progress: std.atomic.Value(i32) = .init(0),
 transport: ?lsp.AnyTransport = null,
@@ -41,6 +41,8 @@ pub const Hash = [Hasher.mac_length]u8;
 
 pub const max_document_size = std.math.maxInt(u32);
 
+pub const supports_build_system = std.process.can_spawn;
+
 pub fn computeHash(bytes: []const u8) Hash {
     var hasher: Hasher = .init(&@splat(0));
     hasher.update(bytes);
@@ -316,6 +318,7 @@ pub const Handle = struct {
     /// `DocumentStore.build_files` is guaranteed to contain this Uri.
     /// Uri memory managed by its build_file
     pub fn getAssociatedBuildFileUri(self: *Handle, document_store: *DocumentStore) error{OutOfMemory}!?Uri {
+        comptime std.debug.assert(supports_build_system);
         switch (try self.getAssociatedBuildFileUri2(document_store)) {
             .none,
             .unresolved,
@@ -336,6 +339,8 @@ pub const Handle = struct {
         /// The associated build file (build.zig) has been successfully resolved.
         resolved: *BuildFile,
     } {
+        comptime std.debug.assert(supports_build_system);
+
         self.impl.lock.lock();
         defer self.impl.lock.unlock();
 
@@ -634,16 +639,19 @@ pub fn deinit(self: *DocumentStore) void {
     }
     self.handles.deinit(self.allocator);
 
-    for (self.build_files.values()) |build_file| {
-        build_file.deinit(self.allocator);
-        self.allocator.destroy(build_file);
-    }
-    self.build_files.deinit(self.allocator);
+    if (supports_build_system) {
+        for (self.build_files.values()) |build_file| {
+            build_file.deinit(self.allocator);
+            self.allocator.destroy(build_file);
+        }
+        self.build_files.deinit(self.allocator);
 
-    for (self.cimports.values()) |*result| {
-        result.deinit(self.allocator);
+        for (self.cimports.values()) |*result| {
+            result.deinit(self.allocator);
+        }
+        self.cimports.deinit(self.allocator);
     }
-    self.cimports.deinit(self.allocator);
+
     self.* = undefined;
 }
 
@@ -718,6 +726,7 @@ pub fn getOrLoadHandle(self: *DocumentStore, uri: Uri) ?*Handle {
 /// **Thread safe** takes a shared lock
 /// This function does not protect against data races from modifying the BuildFile
 pub fn getBuildFile(self: *DocumentStore, uri: Uri) ?*BuildFile {
+    comptime std.debug.assert(supports_build_system);
     self.lock.lockShared();
     defer self.lock.unlockShared();
     return self.build_files.get(uri);
@@ -727,6 +736,8 @@ pub fn getBuildFile(self: *DocumentStore, uri: Uri) ?*BuildFile {
 /// **Thread safe** takes an exclusive lock
 /// This function does not protect against data races from modifying the BuildFile
 fn getOrLoadBuildFile(self: *DocumentStore, uri: Uri) ?*BuildFile {
+    comptime std.debug.assert(supports_build_system);
+
     if (self.getBuildFile(uri)) |build_file| return build_file;
 
     const new_build_file: *BuildFile = blk: {
@@ -754,9 +765,7 @@ fn getOrLoadBuildFile(self: *DocumentStore, uri: Uri) ?*BuildFile {
 
     // this code path is only reached when the build file is new
 
-    if (std.process.can_spawn) {
-        self.invalidateBuildFile(new_build_file.uri);
-    }
+    self.invalidateBuildFile(new_build_file.uri);
 
     return new_build_file;
 }
@@ -817,8 +826,10 @@ pub fn closeDocument(self: *DocumentStore, uri: Uri) void {
     defer self.lock.unlock();
 
     self.garbageCollectionImports() catch {};
-    self.garbageCollectionCImports() catch {};
-    self.garbageCollectionBuildFiles() catch {};
+    if (supports_build_system) {
+        self.garbageCollectionCImports() catch {};
+        self.garbageCollectionBuildFiles() catch {};
+    }
 }
 
 /// Takes ownership of `new_text` which has to be allocated with this DocumentStore's allocator.
@@ -864,7 +875,7 @@ pub fn refreshDocumentFromFileSystem(self: *DocumentStore, uri: Uri) !bool {
 /// Invalidates a build files.
 /// **Thread safe** takes a shared lock
 pub fn invalidateBuildFile(self: *DocumentStore, build_file_uri: Uri) void {
-    comptime std.debug.assert(std.process.can_spawn);
+    comptime std.debug.assert(supports_build_system);
 
     if (self.config.zig_exe_path == null) return;
     if (self.config.build_runner_path == null) return;
@@ -1464,7 +1475,9 @@ fn createDocument(self: *DocumentStore, uri: Uri, text: [:0]const u8, open: bool
 
     _ = handle.setOpen(open);
 
-    if (isBuildFile(handle.uri) and !isInStd(handle.uri)) {
+    if (!supports_build_system) {
+        // nothing to do
+    } else if (isBuildFile(handle.uri) and !isInStd(handle.uri)) {
         _ = self.getOrLoadBuildFile(handle.uri);
     } else if (!isBuiltinFile(handle.uri) and !isInStd(handle.uri)) blk: {
         const potential_build_files = self.collectPotentialBuildFiles(uri) catch {
@@ -1614,6 +1627,8 @@ fn collectDependenciesInternal(
     const tracy_zone = tracy.trace(@src());
     defer tracy_zone.end();
 
+    if (!supports_build_system) return;
+
     {
         if (lock) store.lock.lockShared();
         defer if (lock) store.lock.unlockShared();
@@ -1656,6 +1671,8 @@ pub fn collectIncludeDirs(
     handle: *Handle,
     include_dirs: *std.ArrayListUnmanaged([]const u8),
 ) !bool {
+    comptime std.debug.assert(supports_build_system);
+
     var arena_allocator: std.heap.ArenaAllocator = .init(allocator);
     defer arena_allocator.deinit();
 
@@ -1695,6 +1712,8 @@ pub fn collectCMacros(
     handle: *Handle,
     c_macros: *std.ArrayListUnmanaged([]const u8),
 ) !bool {
+    comptime std.debug.assert(supports_build_system);
+
     const collected_all = switch (try handle.getAssociatedBuildFileUri2(store)) {
         .none => true,
         .unresolved => false,
@@ -1719,10 +1738,11 @@ pub fn collectCMacros(
 /// returned memory is owned by DocumentStore
 /// **Thread safe** takes an exclusive lock
 pub fn resolveCImport(self: *DocumentStore, handle: *Handle, node: Ast.Node.Index) error{OutOfMemory}!?Uri {
+    comptime std.debug.assert(supports_build_system);
+
     const tracy_zone = tracy.trace(@src());
     defer tracy_zone.end();
 
-    if (!std.process.can_spawn) return null;
     if (self.config.zig_exe_path == null) return null;
     if (self.config.zig_lib_dir == null) return null;
     if (self.config.global_cache_dir == null) return null;
@@ -1891,17 +1911,21 @@ pub fn uriFromImportStr(self: *DocumentStore, allocator: std.mem.Allocator, hand
 
         return try URI.fromPath(allocator, std_path);
     } else if (std.mem.eql(u8, import_str, "builtin")) {
-        if (try handle.getAssociatedBuildFileUri(self)) |build_file_uri| {
-            const build_file = self.getBuildFile(build_file_uri).?;
-            if (build_file.builtin_uri) |builtin_uri| {
-                return try allocator.dupe(u8, builtin_uri);
+        if (supports_build_system) {
+            if (try handle.getAssociatedBuildFileUri(self)) |build_file_uri| {
+                const build_file = self.getBuildFile(build_file_uri).?;
+                if (build_file.builtin_uri) |builtin_uri| {
+                    return try allocator.dupe(u8, builtin_uri);
+                }
             }
         }
         if (self.config.builtin_path) |builtin_path| {
             return try URI.fromPath(allocator, builtin_path);
         }
         return null;
     } else if (!std.mem.endsWith(u8, import_str, ".zig")) {
+        if (!supports_build_system) return null;
+
         if (try handle.getAssociatedBuildFileUri(self)) |build_file_uri| blk: {
             const build_file = self.getBuildFile(build_file_uri).?;
             const build_config = build_file.tryLockConfig() orelse break :blk;

src/Server.zig

@@ -527,6 +527,7 @@ fn initializeHandler(server: *Server, arena: std.mem.Allocator, request: types.I
         }
     }
 
+    // TODO Instead of checking `is_test`, possible config paths should be provided by the main function.
     if (!zig_builtin.is_test) {
         var maybe_config_result = if (server.config_path) |config_path|
             configuration.loadFromFile(server.allocator, config_path)
@@ -877,9 +878,12 @@ fn removeWorkspace(server: *Server, uri: types.URI) void {
 fn didChangeWatchedFilesHandler(server: *Server, arena: std.mem.Allocator, notification: types.DidChangeWatchedFilesParams) Error!void {
     var updated_files: usize = 0;
     for (notification.changes) |change| {
-        const file_path = Uri.parse(arena, change.uri) catch |err| {
-            log.err("failed to parse URI '{s}': {}", .{ change.uri, err });
-            continue;
+        const file_path = Uri.parse(arena, change.uri) catch |err| switch (err) {
+            error.UnsupportedScheme => continue,
+            else => {
+                log.err("failed to parse URI '{s}': {}", .{ change.uri, err });
+                continue;
+            },
         };
         const file_extension = std.fs.path.extension(file_path);
         if (!std.mem.eql(u8, file_extension, ".zig") and !std.mem.eql(u8, file_extension, ".zon")) continue;
@@ -1079,7 +1083,7 @@ pub fn updateConfiguration(
         }
     }
 
-    if (new_zig_exe_path or new_zig_lib_path) {
+    if (DocumentStore.supports_build_system and (new_zig_exe_path or new_zig_lib_path)) {
         for (server.document_store.cimports.values()) |*result| {
             result.deinit(server.document_store.allocator);
         }
@@ -1148,14 +1152,6 @@ pub fn updateConfiguration(
         }
     }
 
-    if (server.config.prefer_ast_check_as_child_process) {
-        if (!std.process.can_spawn) {
-            log.info("'prefer_ast_check_as_child_process' is ignored because the '{s}' operating system can't spawn child processes", .{@tagName(zig_builtin.target.os.tag)});
-        } else if (server.status == .initialized and server.config.zig_exe_path == null) {
-            log.warn("'prefer_ast_check_as_child_process' is ignored because Zig could not be found", .{});
-        }
-    }
-
     if (server.config.enable_build_on_save orelse false) {
         if (!BuildOnSaveSupport.isSupportedComptime()) {
             // This message is not very helpful but it relatively uncommon to happen anyway.

src/analysis.zig

@@ -2186,6 +2186,7 @@ fn resolveTypeOfNodeUncached(analyser: *Analyser, node_handle: NodeWithHandle) e
             }
 
             if (std.mem.eql(u8, call_name, "@cImport")) {
+                if (!DocumentStore.supports_build_system) return null;
                 const cimport_uri = (try analyser.store.resolveCImport(handle, node)) orelse return null;
 
                 const new_handle = analyser.store.getOrLoadHandle(cimport_uri) orelse return null;

src/configuration.zig

@@ -10,19 +10,21 @@ const Config = @import("Config.zig");
 
 const logger = std.log.scoped(.config);
 
-pub fn getLocalConfigPath(allocator: std.mem.Allocator) known_folders.Error!?[]const u8 {
+fn getLocalConfigPath(allocator: std.mem.Allocator) known_folders.Error!?[]const u8 {
     const folder_path = try known_folders.getPath(allocator, .local_configuration) orelse return null;
     defer allocator.free(folder_path);
     return try std.fs.path.join(allocator, &.{ folder_path, "zls.json" });
 }
 
-pub fn getGlobalConfigPath(allocator: std.mem.Allocator) known_folders.Error!?[]const u8 {
+fn getGlobalConfigPath(allocator: std.mem.Allocator) known_folders.Error!?[]const u8 {
     const folder_path = try known_folders.getPath(allocator, .global_configuration) orelse return null;
     defer allocator.free(folder_path);
     return try std.fs.path.join(allocator, &.{ folder_path, "zls.json" });
 }
 
 pub fn load(allocator: std.mem.Allocator) error{OutOfMemory}!LoadConfigResult {
+    if (builtin.target.os.tag == .wasi) return .not_found;
+
     const local_config_path = getLocalConfigPath(allocator) catch |err| blk: {
         logger.warn("failed to resolve local configuration path: {}", .{err});
         break :blk null;

src/features/completions.zig

@@ -744,6 +744,7 @@ fn completeFileSystemStringLiteral(builder: *Builder, pos_context: Analyser.Posi
     if (std.fs.path.isAbsolute(completing) and pos_context != .import_string_literal) {
         try search_paths.append(builder.arena, completing);
     } else if (pos_context == .cinclude_string_literal) {
+        if (!DocumentStore.supports_build_system) return;
         _ = store.collectIncludeDirs(builder.arena, builder.orig_handle, &search_paths) catch |err| {
             log.err("failed to resolve include paths: {}", .{err});
             return;
@@ -804,31 +805,35 @@ fn completeFileSystemStringLiteral(builder: *Builder, pos_context: Analyser.Posi
     }
 
     if (completing.len == 0 and pos_context == .import_string_literal) {
-        if (try builder.orig_handle.getAssociatedBuildFileUri(store)) |uri| blk: {
-            const build_file = store.getBuildFile(uri).?;
-            const build_config = build_file.tryLockConfig() orelse break :blk;
-            defer build_file.unlockConfig();
-
-            try completions.ensureUnusedCapacity(builder.arena, build_config.packages.len);
-            for (build_config.packages) |pkg| {
-                completions.putAssumeCapacity(.{
-                    .label = pkg.name,
-                    .kind = .Module,
-                    .detail = pkg.path,
-                }, {});
-            }
-        } else if (DocumentStore.isBuildFile(builder.orig_handle.uri)) blk: {
-            const build_file = store.getBuildFile(builder.orig_handle.uri) orelse break :blk;
-            const build_config = build_file.tryLockConfig() orelse break :blk;
-            defer build_file.unlockConfig();
-
-            try completions.ensureUnusedCapacity(builder.arena, build_config.deps_build_roots.len);
-            for (build_config.deps_build_roots) |dbr| {
-                completions.putAssumeCapacity(.{
-                    .label = dbr.name,
-                    .kind = .Module,
-                    .detail = dbr.path,
-                }, {});
+        no_modules: {
+            if (!DocumentStore.supports_build_system) break :no_modules;
+
+            if (try builder.orig_handle.getAssociatedBuildFileUri(store)) |uri| {
+                const build_file = store.getBuildFile(uri).?;
+                const build_config = build_file.tryLockConfig() orelse break :no_modules;
+                defer build_file.unlockConfig();
+
+                try completions.ensureUnusedCapacity(builder.arena, build_config.packages.len);
+                for (build_config.packages) |pkg| {
+                    completions.putAssumeCapacity(.{
+                        .label = pkg.name,
+                        .kind = .Module,
+                        .detail = pkg.path,
+                    }, {});
+                }
+            } else if (DocumentStore.isBuildFile(builder.orig_handle.uri)) {
+                const build_file = store.getBuildFile(builder.orig_handle.uri) orelse break :no_modules;
+                const build_config = build_file.tryLockConfig() orelse break :no_modules;
+                defer build_file.unlockConfig();
+
+                try completions.ensureUnusedCapacity(builder.arena, build_config.deps_build_roots.len);
+                for (build_config.deps_build_roots) |dbr| {
+                    completions.putAssumeCapacity(.{
+                        .label = dbr.name,
+                        .kind = .Module,
+                        .detail = dbr.path,
+                    }, {});
+                }
             }
         }
 

src/features/goto.zig

@@ -129,6 +129,8 @@ fn gotoDefinitionBuiltin(
     const name_loc = offsets.tokenIndexToLoc(handle.tree.source, loc.start);
     const name = offsets.locToSlice(handle.tree.source, name_loc);
     if (std.mem.eql(u8, name, "@cImport")) {
+        if (!DocumentStore.supports_build_system) return null;
+
         const tree = handle.tree;
         const index = for (handle.cimports.items(.node), 0..) |cimport_node, index| {
             const main_token = tree.nodeMainToken(cimport_node);
@@ -205,6 +207,8 @@ fn gotoDefinitionString(
         .cinclude_string_literal => try URI.fromPath(
             arena,
             blk: {
+                if (!DocumentStore.supports_build_system) return null;
+
                 if (std.fs.path.isAbsolute(import_str)) break :blk import_str;
                 var include_dirs: std.ArrayListUnmanaged([]const u8) = .empty;
                 _ = document_store.collectIncludeDirs(arena, handle, &include_dirs) catch |err| {

src/main.zig

@@ -100,6 +100,7 @@ fn logFn(
 }
 
 fn defaultLogFilePath(allocator: std.mem.Allocator) std.mem.Allocator.Error!?[]const u8 {
+    if (zig_builtin.target.os.tag == .wasi) return null;
     const cache_path = known_folders.getPath(allocator, .cache) catch |err| switch (err) {
         error.OutOfMemory => return error.OutOfMemory,
         error.ParseError => return null,
@@ -282,7 +283,7 @@ fn parseArgs(allocator: std.mem.Allocator) ParseArgsError!ParseArgsResult {
         }
     }
 
-    if (std.io.getStdIn().isTty()) {
+    if (zig_builtin.target.os.tag != .wasi and std.io.getStdIn().isTty()) {
         log.warn("ZLS is not a CLI tool, it communicates over the Language Server Protocol.", .{});
         log.warn("Did you mean to run 'zls --help'?", .{});
         log.warn("", .{});

src/uri.zig

@@ -69,9 +69,9 @@ test fromPath {
 
 /// Parses a Uri and returns the unescaped path
 /// Caller owns the returned memory
-pub fn parse(allocator: std.mem.Allocator, str: []const u8) (std.Uri.ParseError || error{OutOfMemory})![]u8 {
+pub fn parse(allocator: std.mem.Allocator, str: []const u8) (std.Uri.ParseError || error{ UnsupportedScheme, OutOfMemory })![]u8 {
     var uri = try std.Uri.parse(str);
-    if (!std.mem.eql(u8, uri.scheme, "file")) return error.InvalidFormat;
+    if (!std.mem.eql(u8, uri.scheme, "file")) return error.UnsupportedScheme;
     if (builtin.os.tag == .windows and uri.path.percent_encoded.len != 0 and uri.path.percent_encoded[0] == '/') {
         uri.path.percent_encoded = uri.path.percent_encoded[1..];
     }