feat: add zellij support

Very rudimentary, draft to support zellij.

autoload/tpipeline.vim

@@ -5,14 +5,33 @@ endif
 let s:exit_code = -1
 
 func tpipeline#get_filepath()
-	" e.g. /tmp/tmux-1000/default-$0-vimbridge
-	let tmux = $TMUX
-	if empty(tmux)
-		let p = "/tmp/tmux-" . systemlist("id -u")[-1]
+
+	if !empty($ZELLIJ)
+		" e.g. /tmp/zjstatus-$UID/$SESSION_NAME-$PANE_ID-vimbridge
+		let p = "/tmp/zjstatus-" . systemlist("id -u")[-1]
 		silent! call mkdir(p)
-		let tmux = p . "/default,0,0"
+		let session = $ZELLIJ_SESSION_NAME
+		" TODO: wait for https://github.com/zellij-org/zellij/issues/2835
+		" so we can identify the currently active pane. Now I have to hardcode it
+		" to zjstatus - so no reason to use the variable here, yet.
+		" let paneid = $ZELLIJ_PANE_ID
+		let paneid = "0"
+		let p = p . "/"
+		let zellij = p . session . "-" . paneid . "-vimbridge"
+		return zellij
+	endif
+
+
+	if !empty($TMUX)
+		" e.g. /tmp/tmux-1000/default-$0-vimbridge
+		let tmux = $TMUX
+		if empty(tmux)
+			let p = "/tmp/tmux-" . systemlist("id -u")[-1]
+			silent! call mkdir(p)
+			let tmux = p . "/default,0,0"
+		endif
+		return strcharpart(tmux, 0, stridx(tmux, ",")) . '-$' . strcharpart(tmux, strridx(tmux, ",") + 1) . '-vimbridge'
 	endif
-	return strcharpart(tmux, 0, stridx(tmux, ",")) . '-$' . strcharpart(tmux, strridx(tmux, ",") + 1) . '-vimbridge'
 endfunc
 
 func tpipeline#build_hooks()
@@ -169,6 +188,7 @@ func tpipeline#exit_cb(job, code)
 endfunc
 
 func tpipeline#fork_job()
+	" TODO: for ZELLIJ, only do what is necessary
 	if g:tpipeline_restore
 		let s:restore_left = systemlist("sh -c 'echo \"\"; tmux display-message -p \"#{status-left}\"'")[-1]
 		let s:restore_right = systemlist("sh -c 'echo \"\"; tmux display-message -p \"#{status-right}\"'")[-1]

autoload/tpipeline/util.vim

@@ -12,7 +12,12 @@ func tpipeline#util#left_justify(str)
 endfunc
 
 func tpipeline#util#set_size()
-	let g:tpipeline_size = str2nr(systemlist("sh -c 'echo \"\"; tmux display-message -p \"#{window_width}\"'")[-1])
+	if !empty($TMUX)
+		let g:tpipeline_size = str2nr(systemlist("sh -c 'echo \"\"; tmux display-message -p \"#{window_width}\"'")[-1])
+	elseif !empty($ZELLIJ)
+		" TODO: verify if this is reasonable.
+		let g:tpipeline_size = str2nr(systemlist("sh -c 'tput cols'")[-1])
+	endif
 endfunc
 
 func tpipeline#util#set_custom_size()

plugin/tpipeline.vim

@@ -1,4 +1,4 @@
-if exists('g:loaded_tpipeline') || (empty($TMUX) && !exists("g:tpipeline_refreshcmd")) || !(has('nvim-0.6') ? len(nvim_list_uis()) : (has('job') && has('patch-8.2.4650'))) || has('gui_running')
+if exists('g:loaded_tpipeline') || (empty($ZELLIJ) && empty($TMUX) && !exists("g:tpipeline_refreshcmd")) || !(has('nvim-0.6') ? len(nvim_list_uis()) : (has('job') && has('patch-8.2.4650'))) || has('gui_running')
 	finish
 endif
 let g:loaded_tpipeline = 1