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--
-- 50-session.lua
--
-- * Saves, loads, deletes and restarts Vim sessions stored under stdpath("state")/sessions.
-- * Augments :mksession with a JSON sidecar (dotfiles.session) for state it can't restore on its
-- own: tab names and man:// windows.
--
-- User commands:
-- `SessionSave`: save the session
-- `SessionLoad`: load the session
-- `SessionDelete`: delete the session
-- `SessionRestart`: save the session, then restart Neovim into it
-- `SessionExitSave`: save the session and quit
-- `SessionExitNoSave`: quit without saving the session
--
local session = require("dotfiles.session")
vim.opt.sessionoptions:remove("folds")
local session_dir = vim.fn.stdpath("state") .. "/sessions"
local session_default = session_dir .. "/default.vim"
if not vim.uv.fs_stat(session_dir) then
vim.uv.fs_mkdir(session_dir, tonumber("755", 8))
vim.notify("Sessions save directory created at " .. session_dir, vim.log.levels.INFO)
end
----------------------------------------------------------------------------------------------------
-- Sidecar providers
----------------------------------------------------------------------------------------------------
-- Capture each tab's t:tabname (:mksession drops tab-local variables). Stored positionally because
-- :mksession recreates tabs in their original order, making the index stable across reloads.
local function save_tabnames()
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
return names
end
-- Reapply the saved names to the recreated tabs by position, then redraw so they show at once.
local function restore_tabnames(names)
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
-- man:// windows: :mksession can't restore them (they're :buftype=nofile, not backed by a file), so
-- we record them ourselves, nested as tab index -> window number -> { buffer name, cursor line }.
-- Both indices are positional for the same reason as tab names above: :mksession recreates tabs and
-- their windows in order, so the ordinals are stable across reloads. Nesting by tab matters because
-- window numbers restart at 1 in each tabpage and would otherwise collide. The indices are
-- stringified so the sparse table encodes as a JSON object, not a null-padded array.
--
-- Limitation: the cursor line is an index into the *rendered* man page, whose line wrapping depends
-- on MANWIDTH. If MANWIDTH differs on load, the page re-wraps and the saved line points elsewhere.
-- (It never changes in this setup, but the dependency is real.)
local function save_manpages()
local pages = {}
for ti, tp in ipairs(vim.api.nvim_list_tabpages()) do
for _, win in ipairs(vim.api.nvim_tabpage_list_wins(tp)) do
local name = vim.api.nvim_buf_get_name(vim.api.nvim_win_get_buf(win))
if name:match("^man://") then
local tk = tostring(ti)
pages[tk] = pages[tk] or {}
pages[tk][tostring(vim.api.nvim_win_get_number(win))] =
{ name = name, line = vim.api.nvim_win_get_cursor(win)[1] }
end
end
end
return pages
end
-- Reopen the man:// buffers recorded by save_manpages(). Keys come back from JSON as strings, hence
-- the tonumber(). :edit man://... re-renders the page via the man plugin's BufReadCmd; we run it
-- window-scoped so the layout restored by :mksession is left untouched, then clamp the saved cursor
-- line to the (possibly re-wrapped) page.
local function restore_manpages(pages)
local tabpages = vim.api.nvim_list_tabpages()
for tk, wins in pairs(pages) do
local tp = tabpages[tonumber(tk)]
if tp then
local by_number = {}
for _, win in ipairs(vim.api.nvim_tabpage_list_wins(tp)) do
by_number[vim.api.nvim_win_get_number(win)] = win
end
for wk, info in pairs(wins) do
local win = by_number[tonumber(wk)]
if win then
vim.api.nvim_win_call(win, function()
vim.cmd.edit({ args = { info.name } })
end)
local buf = vim.api.nvim_win_get_buf(win)
local line =
math.max(1, math.min(info.line or 1, vim.api.nvim_buf_line_count(buf)))
vim.api.nvim_win_set_cursor(win, { line, 0 })
end
end
end
end
end
session.register("tabnames", save_tabnames, restore_tabnames)
session.register("manpages", save_manpages, restore_manpages)
----------------------------------------------------------------------------------------------------
-- Session operations
----------------------------------------------------------------------------------------------------
local function save_session(path)
vim.cmd.mksession({ path, bang = true })
session.write(path)
end
local function load_session(path)
vim.cmd.source(path)
session.read(path)
end
local function reload_session(path)
save_session(path)
vim.cmd.restart({ args = { "+qall", "SessionLoad", path } })
end
local function delete_session(path)
vim.fs.rm(path)
session.remove(path)
end
-- Complete session names (without the .vim extension) from the sessions directory.
local function session_completefunc(arg_lead, _, _)
local completions = {}
for path in vim.fs.dir(session_dir) do
if string.match(path, "^" .. arg_lead) and string.match(path, ".vim$") then
completions[#completions + 1] = path:sub(1, -5)
end
end
return completions
end
-- Resolve a session name (or empty for the default) to an absolute `.vim` path, then run `op` on it.
local function session_op(base, op)
local path = #base > 0 and base or session_default
if not string.match(path, "^" .. session_dir) then
path = session_dir .. "/" .. path
end
if not string.match(path, "%.vim$") then
path = path .. ".vim"
end
op(path)
end
----------------------------------------------------------------------------------------------------
-- User commands
----------------------------------------------------------------------------------------------------
local function cmd_session_save(ev)
session_op(ev.args, save_session)
end
local function cmd_session_load(ev)
session_op(ev.args, load_session)
end
local function cmd_session_delete(ev)
session_op(ev.args, delete_session)
end
local function cmd_session_restart(ev)
session_op(ev.args, reload_session)
end
local function cmd_session_exit_save(ev)
session_op(ev.args, save_session)
vim.cmd.qall()
end
local function cmd_session_exit_no_save()
vim.cmd.qall()
end
vim.api.nvim_create_user_command(
"SessionSave",
cmd_session_save,
{ desc = "Save session", nargs = "?", complete = session_completefunc }
)
vim.api.nvim_create_user_command(
"SessionLoad",
cmd_session_load,
{ desc = "Load session", nargs = "?", complete = session_completefunc }
)
vim.api.nvim_create_user_command(
"SessionDelete",
cmd_session_delete,
{ desc = "Delete session", nargs = "?", complete = session_completefunc }
)
vim.api.nvim_create_user_command(
"SessionRestart",
cmd_session_restart,
{ desc = "Reload session", nargs = "?", complete = session_completefunc }
)
vim.api.nvim_create_user_command(
"SessionExitSave",
cmd_session_exit_save,
{ desc = "Save session and exit", nargs = "?", complete = session_completefunc }
)
vim.api.nvim_create_user_command(
"SessionExitNoSave",
cmd_session_exit_no_save,
{ desc = "Exit without saving session", nargs = "?", complete = session_completefunc }
)
|
