Prove multi-file terminal coding loop

src/main.zig

@@ -163,6 +163,7 @@ fn openLocalEditor(
         switch (metadata.kind) {
             .directory => try openDirectoryPreview(allocator, io, &client, path),
             .file => {
+                if (std.fs.path.dirname(path)) |parent| seedDirectoryRepo(allocator, io, &client, parent) catch {};
                 const bytes = std.Io.Dir.cwd().readFileAlloc(io, path, allocator, .limited(diagnostics.max_file_bytes)) catch |err| switch (err) {
                     error.StreamTooLong => {
                         try client.handleTraceLine("open diagnostic:file_too_large");
@@ -184,7 +185,7 @@ fn openLocalEditor(
     try runLocalEditor(allocator, io, stdout, stderr, &client, path, stat != null and stat.?.kind == .directory);
 }
 
-fn openDirectoryPreview(allocator: std.mem.Allocator, io: std.Io, client: *tui.Client, path: []const u8) !void {
+fn seedDirectoryRepo(allocator: std.mem.Allocator, io: std.Io, client: *tui.Client, path: []const u8) !void {
     var dir = try std.Io.Dir.cwd().openDir(io, path, .{ .iterate = true });
     defer dir.close(io);
 
@@ -211,6 +212,10 @@ fn openDirectoryPreview(allocator: std.mem.Allocator, io: std.Io, client: *tui.C
         }
         count += 1;
     }
+}
+
+fn openDirectoryPreview(allocator: std.mem.Allocator, io: std.Io, client: *tui.Client, path: []const u8) !void {
+    try seedDirectoryRepo(allocator, io, client, path);
     try client.handleTraceLine("file_picker");
 }
 
@@ -236,6 +241,8 @@ fn runLocalEditor(
         return;
     }
 
+    if (is_dir) try client.openFilePicker();
+
     var raw_terminal = try RawTerminal.enable(stdin_file.handle);
     defer raw_terminal.restore();
 
@@ -259,10 +266,12 @@ fn runLocalEditor(
         if (client.saved()) |saved_bytes| {
             const new_save_request = last_client_saved == null or !std.mem.eql(u8, saved_bytes, last_client_saved.?);
             if (new_save_request) {
-                if (is_dir) {
+                if (is_dir and client.currentPath() == null) {
                     client.setStatusMessage("directory browser has nothing to save");
                 } else {
-                    try persistLocalSave(allocator, io, path, saved_bytes, &last_saved, &last_client_saved);
+                    const save_path = try resolveLocalSavePath(allocator, path, client.currentPath());
+                    defer allocator.free(save_path);
+                    try persistLocalSave(allocator, io, save_path, saved_bytes, &last_saved, &last_client_saved);
                     dirty = false;
                     client.setStatusMessage("saved");
                 }
@@ -280,6 +289,13 @@ fn runLocalEditor(
     }
 }
 
+fn resolveLocalSavePath(allocator: std.mem.Allocator, launch_path: []const u8, current_path: ?[]const u8) ![]u8 {
+    const selected = current_path orelse launch_path;
+    if (std.fs.path.isAbsolute(selected) or std.mem.indexOfScalar(u8, selected, '/') != null) return allocator.dupe(u8, selected);
+    const base = std.fs.path.dirname(launch_path) orelse ".";
+    return std.fs.path.join(allocator, &.{ base, selected });
+}
+
 fn persistLocalSave(
     allocator: std.mem.Allocator,
     io: std.Io,