From bd27db46d17ecb012b2209c86a6aff365158310b Mon Sep 17 00:00:00 2001
From: CJ van den Berg <cj@vdbonline.com>
Date: Mon, 19 Aug 2024 22:44:57 +0200
Subject: [PATCH] feat: open most recent file on project switch

---
 src/Project.zig         |  5 +++++
 src/project_manager.zig | 18 ++++++++++++++++++
 src/tui/mainview.zig    |  4 ++++
 3 files changed, 27 insertions(+)

diff --git a/src/Project.zig b/src/Project.zig
index 1a4d726..9c3a1bc 100644
--- a/src/Project.zig
+++ b/src/Project.zig
@@ -140,6 +140,11 @@ pub fn sort_files_by_mtime(self: *Self) void {
     std.mem.sort(File, self.files.items, {}, less_fn);
 }
 
+pub fn request_most_recent_file(self: *Self, from: tp.pid_ref) error{ OutOfMemory, Exit }!void {
+    const file_path = if (self.files.items.len > 0) self.files.items[0].path else null;
+    try from.send(.{file_path});
+}
+
 pub fn request_recent_files(self: *Self, from: tp.pid_ref, max: usize) error{ OutOfMemory, Exit }!void {
     defer from.send(.{ "PRJ", "recent_done", self.longest_file_path, "" }) catch {};
     for (self.files.items, 0..) |file, i| {
diff --git a/src/project_manager.zig b/src/project_manager.zig
index 94f89c3..e02b5bb 100644
--- a/src/project_manager.zig
+++ b/src/project_manager.zig
@@ -45,6 +45,16 @@ pub fn open(rel_project_directory: []const u8) !void {
     return (try get()).pid.send(.{ "open", project_directory });
 }
 
+pub fn request_most_recent_file(a: std.mem.Allocator) !?[]const u8 {
+    const project = tp.env.get().str("project");
+    if (project.len == 0)
+        return tp.exit("No project");
+    const rsp = try (try get()).pid.call(a, request_timeout, .{ "request_most_recent_file", project });
+    defer a.free(rsp.buf);
+    var file_path: []const u8 = undefined;
+    return if (try rsp.match(.{tp.extract(&file_path)})) try a.dupe(u8, file_path) else null;
+}
+
 pub fn request_recent_files(max: usize) !void {
     const project = tp.env.get().str("project");
     if (project.len == 0)
@@ -225,6 +235,8 @@ const Process = struct {
             self.logger.print_err("lsp-handling", "child '{s}' terminated", .{path});
         } else if (try m.match(.{ "open", tp.extract(&project_directory) })) {
             self.open(project_directory) catch |e| return from.forward_error(e, @errorReturnTrace());
+        } else if (try m.match(.{ "request_most_recent_file", tp.extract(&project_directory) })) {
+            self.request_most_recent_file(from, project_directory) catch |e| return from.forward_error(e, @errorReturnTrace());
         } else if (try m.match(.{ "request_recent_files", tp.extract(&project_directory), tp.extract(&max) })) {
             self.request_recent_files(from, project_directory, max) catch |e| return from.forward_error(e, @errorReturnTrace());
         } else if (try m.match(.{ "request_recent_projects", tp.extract(&project_directory) })) {
@@ -286,6 +298,12 @@ const Process = struct {
         });
     }
 
+    fn request_most_recent_file(self: *Process, from: tp.pid_ref, project_directory: []const u8) error{ OutOfMemory, Exit }!void {
+        const project = if (self.projects.get(project_directory)) |p| p else return tp.exit("No project");
+        project.sort_files_by_mtime();
+        return project.request_most_recent_file(from);
+    }
+
     fn request_recent_files(self: *Process, from: tp.pid_ref, project_directory: []const u8, max: usize) error{ OutOfMemory, Exit }!void {
         const project = if (self.projects.get(project_directory)) |p| p else return tp.exit("No project");
         project.sort_files_by_mtime();
diff --git a/src/tui/mainview.zig b/src/tui/mainview.zig
index ac1d6c3..c55e452 100644
--- a/src/tui/mainview.zig
+++ b/src/tui/mainview.zig
@@ -258,6 +258,10 @@ const cmds = struct {
         const project = tp.env.get().str("project");
         tui.current().rdr.set_terminal_working_directory(project);
         _ = try self.statusbar.msg(.{ "PRJ", "open" });
+        if (try project_manager.request_most_recent_file(self.a)) |file_path| {
+            defer self.a.free(file_path);
+            try tp.self_pid().send(.{ "cmd", "navigate", .{ .file = file_path } });
+        }
     }
 
     pub fn navigate(self: *Self, ctx: Ctx) Result {