fix: remove blocking project manager call on startup

closes #214

The blocking call get_mru_postion to the project mananger may cause
a deadlock if the project manager has not started running yet.

src/completion.zig

@@ -0,0 +1,65 @@
+const std = @import("std");
+const tp = @import("thespian");
+
+const OutOfMemoryError = error{OutOfMemory};
+const SpawnError = error{ThespianSpawnFailed};
+
+pub fn send(
+    allocator: std.mem.Allocator,
+    to: tp.pid_ref,
+    m: anytype,
+    ctx: anytype,
+) (OutOfMemoryError || SpawnError)!void {
+    return RequestContext(@TypeOf(ctx)).send(allocator, to, ctx, tp.message.fmt(m));
+}
+
+fn RequestContext(T: type) type {
+    return struct {
+        receiver: ReceiverT,
+        ctx: T,
+        to: tp.pid,
+        request: tp.message,
+        response: ?tp.message,
+        a: std.mem.Allocator,
+
+        const Self = @This();
+        const ReceiverT = tp.Receiver(*@This());
+
+        fn send(a: std.mem.Allocator, to: tp.pid_ref, ctx: T, request: tp.message) (OutOfMemoryError || SpawnError)!void {
+            const self = try a.create(@This());
+            self.* = .{
+                .receiver = undefined,
+                .ctx = if (@hasDecl(T, "clone")) ctx.clone() else ctx,
+                .to = to.clone(),
+                .request = try request.clone(std.heap.c_allocator),
+                .response = null,
+                .a = a,
+            };
+            self.receiver = ReceiverT.init(receive_, self);
+            const proc = try tp.spawn_link(a, self, start, @typeName(@This()));
+            defer proc.deinit();
+        }
+
+        fn deinit(self: *@This()) void {
+            if (@hasDecl(T, "deinit")) self.ctx.deinit();
+            std.heap.c_allocator.free(self.request.buf);
+            self.to.deinit();
+            self.a.destroy(self);
+        }
+
+        fn start(self: *@This()) tp.result {
+            _ = tp.set_trap(true);
+            if (@hasDecl(T, "link")) try self.ctx.link();
+            errdefer self.deinit();
+            try self.to.link();
+            try self.to.send_raw(self.request);
+            tp.receive(&self.receiver);
+        }
+
+        fn receive_(self: *@This(), _: tp.pid_ref, m: tp.message) tp.result {
+            defer self.deinit();
+            self.ctx.receive(m) catch |e| return tp.exit_error(e, @errorReturnTrace());
+            return tp.exit_normal();
+        }
+    };
+}

src/project_manager.zig

@@ -232,16 +232,13 @@ pub fn update_mru(file_path: []const u8, row: usize, col: usize, ephemeral: bool
     return send(.{ "update_mru", project, file_path, row, col });
 }
 
-pub fn get_mru_position(allocator: std.mem.Allocator, file_path: []const u8) (ProjectManagerError || ProjectError || CallError || cbor.Error)!?Project.FilePos {
-    const frame = tracy.initZone(@src(), .{ .name = "get_mru_position" });
-    defer frame.deinit();
+pub fn get_mru_position(allocator: std.mem.Allocator, file_path: []const u8, ctx: anytype) (ProjectManagerError || ProjectError)!void {
     const project = tp.env.get().str("project");
     if (project.len == 0)
         return error.NoProject;
-    const rsp = try (try get()).pid.call(allocator, request_timeout, .{ "get_mru_position", project, file_path });
-    defer allocator.free(rsp.buf);
-    var pos: Project.FilePos = undefined;
-    return if (try cbor.match(rsp.buf, .{ tp.extract(&pos.row), tp.extract(&pos.col) })) pos else null;
+
+    const cp = @import("completion.zig");
+    return cp.send(allocator, (try get()).pid, .{ "get_mru_position", project, file_path }, ctx);
 }
 
 const Process = struct {

src/tui/mainview.zig

@@ -115,6 +115,11 @@ pub fn receive(self: *Self, from_: tp.pid_ref, m: tp.message) error{Exit}!bool {
     var end_line: usize = undefined;
     var end_pos: usize = undefined;
     var lines: []const u8 = undefined;
+    var same_file: bool = undefined;
+    var goto_args: []const u8 = undefined;
+    var line: i64 = undefined;
+    var column: i64 = undefined;
+
     if (try m.match(.{ "REF", tp.extract(&path), tp.extract(&begin_line), tp.extract(&begin_pos), tp.extract(&end_line), tp.extract(&end_pos), tp.extract(&lines) })) {
         try self.add_find_in_files_result(.references, path, begin_line, begin_pos, end_line, end_pos, lines, .Information);
         return true;
@@ -139,6 +144,12 @@ pub fn receive(self: *Self, from_: tp.pid_ref, m: tp.message) error{Exit}!bool {
                 .end = .{ .row = end_line, .col = end_pos },
             });
         return true;
+    } else if (try m.match(.{ "navigate_complete", tp.extract(&same_file), tp.extract(&path), tp.extract(&goto_args), tp.extract(&line), tp.extract(&column) })) {
+        cmds.navigate_complete(self, same_file, path, goto_args, line, column) catch |e| return tp.exit_error(e, @errorReturnTrace());
+        return true;
+    } else if (try m.match(.{ "navigate_complete", tp.extract(&same_file), tp.extract(&path), tp.extract(&goto_args), tp.null_, tp.null_ })) {
+        cmds.navigate_complete(self, same_file, path, goto_args, null, null) catch |e| return tp.exit_error(e, @errorReturnTrace());
+        return true;
     }
     return if (try self.floating_views.send(from_, m)) true else self.widgets.send(from_, m);
 }
@@ -371,12 +382,42 @@ const cmds = struct {
         const same_file = if (self.get_active_file_path()) |fp| std.mem.eql(u8, fp, f) else false;
         const have_editor_metadata = if (self.buffer_manager.get_buffer_for_file(f)) |_| true else false;
 
-        if (!same_file and !have_editor_metadata and line == null)
-            if (try project_manager.get_mru_position(self.allocator, f)) |pos| {
-                line = @intCast(pos.row);
-                column = @intCast(pos.col);
+        if (!same_file and !have_editor_metadata and line == null) {
+            const ctx_: struct {
+                allocator: std.mem.Allocator,
+                from: tp.pid,
+                same_file: bool,
+                path: []const u8,
+                goto_args: []const u8,
+
+                pub fn deinit(ctx_: *@This()) void {
+                    ctx_.from.deinit();
+                    ctx_.allocator.free(ctx_.path);
+                    ctx_.allocator.free(ctx_.goto_args);
+                }
+                pub fn receive(ctx_: @This(), rsp: tp.message) !void {
+                    var line_: ?i64 = null;
+                    var column_: ?i64 = null;
+                    _ = try cbor.match(rsp.buf, .{ tp.extract(&line_), tp.extract(&column_) });
+                    try ctx_.from.send(.{ "navigate_complete", ctx_.same_file, ctx_.path, ctx_.goto_args, line_, column_ });
+                }
+            } = .{
+                .allocator = self.allocator,
+                .from = tp.self_pid().clone(),
+                .same_file = same_file,
+                .path = try self.allocator.dupe(u8, f),
+                .goto_args = try self.allocator.dupe(u8, goto_args),
             };
 
+            try project_manager.get_mru_position(self.allocator, f, ctx_);
+            return;
+        }
+
+        return cmds.navigate_complete(self, same_file, f, goto_args, line, column);
+    }
+    pub const navigate_meta: Meta = .{ .arguments = &.{.object} };
+
+    fn navigate_complete(self: *Self, same_file: bool, f: []const u8, goto_args: []const u8, line: ?i64, column: ?i64) Result {
         if (!same_file) {
             if (self.get_active_editor()) |editor| {
                 editor.send_editor_jump_source() catch {};
@@ -395,7 +436,6 @@ const cmds = struct {
         }
         tui.need_render();
     }
-    pub const navigate_meta: Meta = .{ .arguments = &.{.object} };
 
     pub fn open_help(self: *Self, _: Ctx) Result {
         tui.reset_drag_context();