first commit

autoload/nvim-maximize-window-toggle.vim

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+""
+" @public
+" If the current tab page has more than one window,
+" opens the current buffer alone in a new tab.
+" Calling this function again in the new window will
+" close the tab and go back to the original window
+""
+function! nvim-maximize-window-toggle#ToggleOnly()
+  if winnr("$") > 1
+  " There are more than one window in this tab
+    if exists("b:maximized_window_id")
+      call win_gotoid(b:maximized_window_id)
+    else
+      let b:origin_window_id = win_getid()
+      tab sp
+      let b:maximized_window_id = win_getid()
+    endif
+  else
+  " This is the only window in this tab
+    if exists("b:origin_window_id")
+      let l:origin_window_id = b:origin_window_id
+      tabclose
+      call win_gotoid(l:origin_window_id)
+      unlet b:maximized_window_id
+      unlet b:origin_window_id
+    endif
+  endif
+endfunction

doc/nvim-maximize-window-toggle.txt

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+*nvim-maximize-window-toggle.txt*
+                                                 *nvim-maximize-window-toggle*
+
+==============================================================================
+CONTENTS                                *nvim-maximize-window-toggle-contents*
+  1. Commands...........................|nvim-maximize-window-toggle-commands|
+
+==============================================================================
+COMMANDS                                *nvim-maximize-window-toggle-commands*
+
+:ToggleOnly                                                      *:ToggleOnly*
+  Maximize the current buffer as a toggle
+
+
+vim:tw=78:ts=8:ft=help:norl:

plugin/nvim-maximize-window-toggle.vim

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+""
+" Maximize the current buffer as a toggle
+""
+command! ToggleOnly call nvim-maximize-window-toggle#ToggleOnly()