feat: configure default markdown formatter to reflow at reflow_width

src/file_type_lsp.zig

@@ -116,7 +116,7 @@ pub const make = .{};
 
 pub const markdown = .{
     .language_server = .{ "marksman", "server" },
-    .formatter = .{ "prettier", "--parser", "markdown" },
+    .formatter = .{ "prettier", "--parser", "markdown", "--prose-wrap", "always", "--print-width", "{{reflow_width}}" },
 };
 
 pub const @"markdown-inline" = .{};

src/tui/expansion.zig

@@ -9,6 +9,7 @@
 /// {{selections*}} - All current selections expanded to multiple quoted arguments
 /// {{indent_mode}} - The current indent mode ("tabs" or "spaces")
 /// {{indent_size}} - The current indent size (in columns)
+/// {{reflow_width}} - The current reflow width (in columns)
 /// {{blame_commit}} - The blame commit ID at the line number of the primary cursor
 pub fn expand(allocator: Allocator, arg: []const u8) Error![]const u8 {
     var result: std.Io.Writer.Allocating = .init(allocator);
@@ -162,6 +163,15 @@ const functions = struct {
         return stream.toOwnedSlice();
     }
 
+    /// {{reflow_width}} - The current reflow width (in columns)
+    pub fn reflow_width(allocator: Allocator) Error![]const u8 {
+        const mv = tui.mainview() orelse return &.{};
+        const ed = mv.get_active_editor() orelse return &.{};
+        var stream: std.Io.Writer.Allocating = .init(allocator);
+        try stream.writer.print("{d}", .{ed.reflow_width orelse tui.config().reflow_width});
+        return stream.toOwnedSlice();
+    }
+
     /// {{blame_commit}} - The blame commit ID at the line number of the primary cursor
     pub fn blame_commit(allocator: Allocator) Error![]const u8 {
         const mv = tui.mainview() orelse return &.{};