Use styled library in main view

lib/tui/view.ml

@@ -18,7 +18,7 @@ let tabs_section cur_tab =
       str "─";
     ]
   in
-  render @@ row
+  row
     [ col
         [
           p_tab Model.Code "╭──────╮";
@@ -42,15 +42,23 @@ let tabs_section cur_tab =
     ]
 
 let file_widget ~max_name_len ~selected files =
+  let open Pretty in
+
   (* Add two spaces for padding before and end of the file name *)
   let max_len = max_name_len + 4 in
+
+  (* Frame *)
   let top = "╭" ^ String_extra.repeat_txt (max_len - 2) "─" ^ "╮" in
   let mid = "├" ^ String_extra.repeat_txt (max_len - 2) "─" ^ "┤" in
   let bot = "╰" ^ String_extra.repeat_txt (max_len - 2) "─" ^ "╯" in
+
+  (* Line *)
   let fmt_line line =
     "│ " ^ String_extra.fill_right max_name_len line ^ " │"
   in
   let hi_pos = 2 * selected + 1 in
+
+  (* Combine *)
   files
   |> Array.to_list
   |> List.map fmt_line
@@ -58,10 +66,10 @@ let file_widget ~max_name_len ~selected files =
   |> (fun lines -> [top] @ lines @ [bot])
   |> List.mapi (fun i s ->
     if i = hi_pos - 1 || i = hi_pos || i = hi_pos + 1
-      then ANSITerminal.sprintf style_selected "%s" s
-      else s
+      then fmt style_selected s
+      else str s
   )
-  |> String_extra.unlines
+  |> col
 
 let code_section (code_tab: Model.code_tab) =
   let cursor = code_tab.fs.current in
@@ -75,17 +83,27 @@ let code_section (code_tab: Model.code_tab) =
 let tab_content_section (model: Model.t) =
   match model.current_tab with
   | Code -> code_section model.code_tab
-  | Issues | PullRequests -> ""
+  | Issues | PullRequests -> Pretty.str ""
 
-let view (model: Model.t) =
-  let repo = ANSITerminal.sprintf style_repo "%s" model.repo in
+let to_doc (model: Model.t) =
+  let open Pretty in
+
+  let empty = str "" in
+  let repo = fmt style_repo model.repo in
   let tabs = tabs_section model.current_tab in
   let content = tab_content_section model in
-  Format.sprintf 
-{|%s
 
-%s
+  col
+    [
+      repo;
+      empty;
 
-%s
+      tabs;
+      empty;
 
-|} repo tabs content
+      content;
+      empty;
+    ]
+
+let view (model: Model.t) =
+  model |> to_doc |> Pretty.render