A simple implementation for creating tags shared on multiple screens for awesome window manager.

This branch of the library is intended to work with awesome version 4 (for all minor versions), but there are other branches with support for other versions.

• Define a list of tags to be usable on all screens.
• Move tags with all clients between screens.
• Everything else should be just as usual.

1. Clone or download a zip of the repository, and put the sharedtags directory somewhere where you can easily include it, for example in the same directory as your rc.lua file, generally located in ~/.config/awesome/.
2. Modify your rc.lua file. A patch against the default configuration is included in the repository for easy comparison, but keep reading for a textual description.
   1. Require the sharedtags library somewhere at the top of the file.

      local sharedtags = require("sharedtags")

   2. Create the tags using the sharedtags() method, instead of the original ones created with awful.tag(). They should be created at the file level, i.e. outside of any function.

      local tags = sharedtags({
          { name = "main", layout = awful.layout.layouts[2] },
          { name = "www", layout = awful.layout.layouts[10] },
          { name = "game", layout = awful.layout.layouts[1] },
          { name = "misc", layout = awful.layout.layouts[2] },
          { name = "chat", screen = 2, layout = awful.layout.layouts[2] },
          { layout = awful.layout.layouts[2] },
          { screen = 2, layout = awful.layout.layouts[2] }
      })

   3. Remove or uncomment the code which creates the tags when a screen is connected, in the connect_for_each_screen callback.

      awful.screen.connect_for_each_screen(function(s)
          -- Each screen has its own tag table.
          --awful.tag({ "1", "2", "3", "4", "5", "6", "7", "8", "9" }, s, awful.layout.layouts[1])
      
          -- Here is a good place to add tags to a newly connected screen, if desired:
          --sharedtags.viewonly(tags[4], s)
      end)

   4. The code for handling tags and clients needs to be changed to use the library and pick the correct tag.

      for i = 1, 9 do
          globalkeys = gears.table.join(globalkeys,
              -- View tag only.
              awful.key({ modkey }, "#" .. i + 9,
                        function ()
                              local screen = awful.screen.focused()
                              local tag = tags[i]
                              if tag then
                                 sharedtags.viewonly(tag, screen)
                              end
                        end,
                        {description = "view tag #"..i, group = "tag"}),
              -- Toggle tag display.
              awful.key({ modkey, "Control" }, "#" .. i + 9,
                        function ()
                            local screen = awful.screen.focused()
                            local tag = tags[i]
                            if tag then
                               sharedtags.viewtoggle(tag, screen)
                            end
                        end,
                        {description = "toggle tag #" .. i, group = "tag"}),
              -- Move client to tag.
              awful.key({ modkey, "Shift" }, "#" .. i + 9,
                        function ()
                            if client.focus then
                                local tag = tags[i]
                                if tag then
                                    client.focus:move_to_tag(tag)
                                end
                           end
                        end,
                        {description = "move focused client to tag #"..i, group = "tag"}),
              -- Toggle tag on focused client.
              awful.key({ modkey, "Control", "Shift" }, "#" .. i + 9,
                        function ()
                            if client.focus then
                                local tag = tags[i]
                                if tag then
                                    client.focus:toggle_tag(tag)
                                end
                            end
                        end,
                        {description = "toggle focused client on tag #" .. i, group = "tag"})
          )
      end

   5. Lastly, any rules referencing the screen and tag should use the newly created tags array instead.

      awful.rules.rules = {
          -- Set Firefox to always map on tag number 2.
          { rule = { class = "Firefox" },
            properties = { tag = tags[2] } }, -- or tags["www"] to map it to the name instead
      }

3. Restart or reload awesome.

1. There is a bug in awesome v4.0 which can cause all tags to be deselected when moving a tag to another screen. The following patch can be used to fix the problem.

   diff --git a/lib/awful/tag.lua b/lib/awful/tag.lua
   index 66bd0c1..b481f42 100644
   --- a/lib/awful/tag.lua
   +++ b/lib/awful/tag.lua
   @@ -475,7 +475,7 @@ end
    function tag.object.set_screen(t, s)
    
        s = get_screen(s or ascreen.focused())
   -    local sel = tag.selected
   +    local sel = t.selected
        local old_screen = get_screen(tag.getproperty(t, "screen"))
    
        if s == old_screen then return end

   The file is located under /usr/share/awesome/lib/awful/tag.lua on my system.
2. Because of constraints in the X server, awesome does not allow toggling clients on tags allocated to other screens. Having a client on multiple tags and moving one of the tags will cause the client to move as well.
3. When selecting a tag on a different screen with sharedtags.viewonly, the tag is pulled to the current screen. To instead move focus to the other screen and view the tag there, use sharedtags.jumpto(tag). This can be used with a seperate bind that calls sharedtags.movetag(tag, screen) to directly move a tag to another screen.

See doc/index.html for API documentation.

Idea originally from https://github.com/lammermann/awesome-configs, but I could not get that implementation to work.