feat(nvim): persist tabpage names across sessions

1 files changed, 34 insertions, 0 deletions

diff --git a/plugin/50-session.lua b/plugin/50-session.lua
index b4aadda..d1610e6 100644
--- a/plugin/50-session.lua
+++ b/plugin/50-session.lua
@@ -9,12 +9,42 @@ if not vim.uv.fs_stat(session_dir) then
 	vim.notify("Sessions save directory created at " .. session_dir)
 end
 
+-- :mksession doesn't persist tab-local vars (t:tabname), so we write tab names to a sidecar
+-- JSON file alongside the .vim session. Names are stored positionally because :mksession
+-- recreates tabs in their original order, making the index stable across reloads.
+local function tabnames_path(path)
+	return (path:gsub("%.vim$", "")) .. ".tabnames.json"
+end
+
 local function save_session(path)
 	vim.cmd.mksession({ path, bang = true })
+	local names = {}
+	for i, tp in ipairs(vim.api.nvim_list_tabpages()) do
+		-- pcall: nvim_tabpage_get_var errors when the variable isn't set on that tab
+		local ok, name = pcall(vim.api.nvim_tabpage_get_var, tp, "tabname")
+		names[i] = (ok and type(name) == "string") and name or ""
+	end
+	local f = io.open(tabnames_path(path), "w")
+	if f then
+		f:write(vim.json.encode(names))
+		f:close()
+	end
 end
 
 local function load_session(path)
 	vim.cmd.source(path)
+	local f = io.open(tabnames_path(path), "r")
+	if not f then
+		return
+	end
+	local names = vim.json.decode(f:read("*a"))
+	f:close()
+	for i, tp in ipairs(vim.api.nvim_list_tabpages()) do
+		if names[i] and names[i] ~= "" then
+			vim.api.nvim_tabpage_set_var(tp, "tabname", names[i])
+		end
+	end
+	vim.cmd.redrawtabline()
 end
 
 local function reload_session(path)
@@ -24,6 +54,10 @@ end
 
 local function delete_session(path)
 	vim.fs.rm(path)
+	local sidecar = tabnames_path(path)
+	if vim.uv.fs_stat(sidecar) then
+		vim.fs.rm(sidecar)
+	end
 end
 
 local function session_completefunc(arg_lead, _, _)