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--- *mini.sessions* Session management
--- *MiniSessions*
---
--- MIT License Copyright (c) 2021 Evgeni Chasnovski
---
--- ==============================================================================
---
--- Read, write, and delete sessions. Uses |mksession| (meaning 'sessionoptions'
--- is fully respected). This is intended as a drop-in Lua replacement for
--- session management part of 'mhinz/vim-startify' (works out of the box with
--- sessions created by it). Implements both global (from configured directory)
--- and local (from current directory) sessions.
---
--- Key design ideas:
--- - Sessions are represented by readable files (results of applying |mksession|).
--- There are two kinds of sessions:
--- - Global: any file inside a configurable directory.
--- - Local: configurable file inside current working directory (|getcwd|).
---
--- - All session files are detected during `MiniSessions.setup()` and during
--- relevant actions (`read`, `delete`, `select`) with file names as session
--- names (including possible extension).
---
--- - No automated new session creation. Use |MiniSessions.write()| manually.
---
--- - Store information about detected sessions in separate table
--- (|MiniSessions.detected|) and operate only on it. Meaning if this information
--- changes, there will be no effect until next detection. To avoid confusion,
--- don't directly use |mksession| / |source| for writing / reading session files.
---
--- Features:
--- - Autoread default session (local if detected, else latest written global) if
--- Neovim was called without intention to show something else.
---
--- - Autowrite currently read session before quitting Neovim.
---
--- - Configurable severity level of all actions.
---
--- # Setup ~
---
--- This module needs a setup with `require('mini.sessions').setup({})`
--- (replace `{}` with your `config` table). It will create global Lua table
--- `MiniSessions` which you can use for scripting or manually (with
--- `:lua MiniSessions.*`).
---
--- See |MiniSessions.config| for `config` structure and default values.
---
--- This module doesn't benefit from buffer local configuration, so using
--- `vim.b.minisessions_config` will have no effect here.
---
--- # Disabling ~
---
--- To disable core functionality, set `vim.g.minisessions_disable` (globally) or
--- `vim.b.minisessions_disable` (for a buffer) to `true`. Considering high
--- number of different scenarios and customization intentions, writing exact
--- rules for disabling module's functionality is left to user. See
--- |mini.nvim-disabling-recipes| for common recipes.
-- Module definition ==========================================================
local MiniSessions = {}
local H = {}
--- Module setup
---
---@param config table|nil Module config table. See |MiniSessions.config|.
---
---@usage >lua
--- require('mini.sessions').setup() -- use default config
--- -- OR
--- require('mini.sessions').setup({}) -- replace {} with your config table
--- <
MiniSessions.setup = function(config)
-- Export module
_G.MiniSessions = MiniSessions
-- Setup config
config = H.setup_config(config)
-- Apply config
H.apply_config(config)
-- Define behavior
H.create_autocommands(config)
end
--- Module config
---
--- Default values:
---@eval return MiniDoc.afterlines_to_code(MiniDoc.current.eval_section)
MiniSessions.config = {
-- Whether to read default session if Neovim opened without file arguments
autoread = false,
-- Whether to write currently read session before quitting Neovim
autowrite = true,
-- Directory where global sessions are stored (use `''` to disable)
--minidoc_replace_start directory = --<"session" subdir of user data directory from |stdpath()|>,
directory = vim.fn.stdpath('data') .. '/session',
--minidoc_replace_end
-- File for local session (use `''` to disable)
file = 'Session.vim',
-- Whether to force possibly harmful actions (meaning depends on function)
force = { read = false, write = true, delete = false },
-- Hook functions for actions. Default `nil` means 'do nothing'.
-- Takes table with active session data as argument.
hooks = {
-- Before successful action
pre = { read = nil, write = nil, delete = nil },
-- After successful action
post = { read = nil, write = nil, delete = nil },
},
-- Whether to print session path after action
verbose = { read = false, write = true, delete = true },
}
--minidoc_afterlines_end
-- Module data ================================================================
--- Table of detected sessions. Keys represent session name. Values are tables
--- with session information that currently has these fields (but subject to
--- change):
--- - <modify_time> `(number)` modification time (see |getftime|) of session file.
--- - <name> `(string)` name of session (should be equal to table key).
--- - <path> `(string)` full path to session file.
--- - <type> `(string)` type of session ('global' or 'local').
MiniSessions.detected = {}
-- Module functionality =======================================================
--- Read detected session
---
--- What it does:
--- - If there is an active session, write it with |MiniSessions.write()|.
--- - Delete all current buffers with |bwipeout|. This is needed to correctly
--- restore buffers from target session. If `force` is not `true`, checks
--- beforehand for unsaved listed buffers and stops if there is any.
--- - Source session with supplied name.
---
---@param session_name string|nil Name of detected session file to read. Default:
--- `nil` for default session: local (if detected) or latest session (see
--- |MiniSessions.get_latest|).
---@param opts table|nil Table with options. Current allowed keys:
--- - <force> (whether to delete unsaved buffers; default:
--- `MiniSessions.config.force.read`).
--- - <verbose> (whether to print session path after action; default
--- `MiniSessions.config.verbose.read`).
--- - <hooks> (a table with <pre> and <post> function hooks to be executed
--- with session data argument before and after successful read; overrides
--- `MiniSessions.config.hooks.pre.read` and
--- `MiniSessions.config.hooks.post.read`).
MiniSessions.read = function(session_name, opts)
if H.is_disabled() then return end
-- Make sessions up to date
H.detect_sessions()
if vim.tbl_count(MiniSessions.detected) == 0 then
return H.message('There is no detected sessions. Change configuration and rerun `MiniSessions.setup()`.')
end
-- Get session data
if session_name == nil then
if MiniSessions.detected[MiniSessions.config.file] ~= nil then
session_name = MiniSessions.config.file
else
session_name = MiniSessions.get_latest()
end
end
opts = vim.tbl_deep_extend('force', H.default_opts('read'), opts or {})
if not H.validate_detected(session_name) then return end
local data = MiniSessions.detected[session_name]
-- Possibly check for unsaved listed buffers and do nothing if present
if not opts.force then
local unsaved_listed_buffers = H.get_unsaved_listed_buffers()
if #unsaved_listed_buffers > 0 then
local buf_list = table.concat(unsaved_listed_buffers, ', ')
H.error(('There are unsaved listed buffers: %s.'):format(buf_list))
end
end
-- Write current session to allow proper switching between sessions
if H.get_this_session() ~= '' then MiniSessions.write(nil, { force = true, verbose = false }) end
-- Execute 'pre' hook
H.possibly_execute(opts.hooks.pre, data)
-- Wipeout all buffers
vim.cmd('silent! %bwipeout!')
-- Read session file
local session_path = data.path
vim.cmd(('silent! source %s'):format(vim.fn.fnameescape(session_path)))
vim.v.this_session = session_path
-- Possibly notify
if opts.verbose then H.message(('Read session %s'):format(session_path)) end
-- Execute 'post' hook
H.possibly_execute(opts.hooks.post, data)
end
--- Write session
---
--- What it does:
--- - Check if file for supplied session name already exists. If it does and
--- `force` is not `true`, then stop.
--- - Write session with |mksession| to a file named `session_name`. Its
--- directory is determined based on type of session:
--- - It is at location |v:this_session| if `session_name` is `nil` and
--- there is currently read session.
--- - It is current working directory (|getcwd|) if `session_name` is equal
--- to `MiniSessions.config.file` (represents local session).
--- - It is `MiniSessions.config.directory` otherwise (represents global
--- session).
--- - Update |MiniSessions.detected|.
---
---@param session_name string|nil Name of session file to write. Default: `nil` for
--- currently read session (|v:this_session|).
---@param opts table|nil Table with options. Current allowed keys:
--- - <force> (whether to ignore existence of session file; default:
--- `MiniSessions.config.force.write`).
--- - <verbose> (whether to print session path after action; default
--- `MiniSessions.config.verbose.write`).
--- - <hooks> (a table with <pre> and <post> function hooks to be executed
--- with session data argument before and after successful write; overrides
--- `MiniSessions.config.hooks.pre.write` and
--- `MiniSessions.config.hooks.post.write`).
MiniSessions.write = function(session_name, opts)
if H.is_disabled() then return end
opts = vim.tbl_deep_extend('force', H.default_opts('write'), opts or {})
local session_path = H.name_to_path(session_name)
if not opts.force and H.is_readable_file(session_path) then
H.error([[Can't write to existing session when `opts.force` is not `true`.]])
end
local data = H.new_session(session_path)
-- Execute 'pre' hook
H.possibly_execute(opts.hooks.pre, data)
-- Make session file
local command = string.format('mksession%s %s', opts.force and '!' or '', vim.fn.fnameescape(session_path))
vim.cmd(command)
data.modify_time = vim.fn.getftime(session_path)
-- Update detected sessions
MiniSessions.detected[data.name] = data
-- Update current session
vim.v.this_session = session_path
-- Possibly notify
if opts.verbose then H.message(('Written session %s'):format(session_path)) end
-- Execute 'post' hook
H.possibly_execute(opts.hooks.post, data)
end
--- Delete detected session
---
--- What it does:
--- - Check if session name is a current one. If yes and `force` is not `true`,
--- then stop.
--- - Delete session.
--- - Update |MiniSessions.detected|.
---
---@param session_name string|nil Name of detected session file to delete. Default:
--- `nil` for name of currently read session (taken from |v:this_session|).
---@param opts table|nil Table with options. Current allowed keys:
--- - <force> (whether to allow deletion of current session; default:
--- `MiniSessions.config.force.delete`).
--- - <verbose> (whether to print session path after action; default
--- `MiniSessions.config.verbose.delete`).
--- - <hooks> (a table with <pre> and <post> function hooks to be executed
--- with session data argument before and after successful delete; overrides
--- `MiniSessions.config.hooks.pre.delete` and
--- `MiniSessions.config.hooks.post.delete`).
MiniSessions.delete = function(session_name, opts)
if H.is_disabled() then return end
if vim.tbl_count(MiniSessions.detected) == 0 then
H.error('There is no detected sessions. Change configuration and rerun `MiniSessions.setup()`.')
end
opts = vim.tbl_deep_extend('force', H.default_opts('delete'), opts or {})
local session_path = H.name_to_path(session_name)
-- Make sessions up to date
H.detect_sessions()
-- Make sure to delete only detected session (matters for local session)
session_name = vim.fn.fnamemodify(session_path, ':t')
if not H.validate_detected(session_name) then return end
session_path = MiniSessions.detected[session_name].path
local is_current_session = session_path == H.get_this_session()
if not opts.force and is_current_session then
H.error([[Can't delete current session when `opts.force` is not `true`.]])
end
local data = MiniSessions.detected[session_name]
-- Execute 'pre' hook
H.possibly_execute(opts.hooks.pre, data)
-- Delete and update detected sessions
vim.fn.delete(session_path)
MiniSessions.detected[session_name] = nil
if is_current_session then vim.v.this_session = '' end
-- Possibly notify
if opts.verbose then H.message(('Deleted session %s'):format(session_path)) end
-- Execute 'pre' hook
H.possibly_execute(opts.hooks.post, data)
end
--- Select session interactively and perform action
---
--- Note: this uses |vim.ui.select()| function. For more user-friendly
--- experience, override it (for example, see |MiniPick.ui_select()|).
---
---@param action string|nil Action to perform. Should be one of "read" (default),
--- "write", or "delete".
---@param opts table|nil Options for specified action.
MiniSessions.select = function(action, opts)
if not (type(vim.ui) == 'table' and type(vim.ui.select) == 'function') then
H.error('`MiniSessions.select()` requires `vim.ui.select()` function.')
end
action = action or 'read'
if not vim.tbl_contains({ 'read', 'write', 'delete' }, action) then
H.error("`action` should be one of 'read', 'write', or 'delete'.")
end
-- Make sessions up to date
H.detect_sessions()
-- Ensure consistent order of items
local detected = {}
for _, session in pairs(MiniSessions.detected) do
table.insert(detected, session)
end
local sort_fun = function(a, b)
-- Put local session first, others - increasing alphabetically
local a_name = a.type == 'local' and '' or a.name
local b_name = b.type == 'local' and '' or b.name
return a_name < b_name
end
table.sort(detected, sort_fun)
local detected_names = vim.tbl_map(function(x) return x.name end, detected)
vim.ui.select(detected_names, {
prompt = 'Select session to ' .. action,
format_item = function(x) return ('%s (%s)'):format(x, MiniSessions.detected[x].type) end,
}, function(item, idx)
if item == nil then return end
MiniSessions[action](item, opts)
end)
end
--- Get name of latest detected session
---
--- Latest session is the session with the latest modification time determined
--- by |getftime|.
---
---@return string|nil Name of latest session or `nil` if there is no sessions.
MiniSessions.get_latest = function()
if vim.tbl_count(MiniSessions.detected) == 0 then return end
local latest_time, latest_name = -1, nil
for name, data in pairs(MiniSessions.detected) do
if data.modify_time > latest_time then
latest_time, latest_name = data.modify_time, name
end
end
return latest_name
end
-- Helper data ================================================================
-- Module default config
H.default_config = vim.deepcopy(MiniSessions.config)
-- Helper functionality =======================================================
-- Settings -------------------------------------------------------------------
H.setup_config = function(config)
H.check_type('config', config, 'table', true)
config = vim.tbl_deep_extend('force', vim.deepcopy(H.default_config), config or {})
H.check_type('autoread', config.autoread, 'boolean')
H.check_type('autowrite', config.autowrite, 'boolean')
H.check_type('directory', config.directory, 'string')
H.check_type('file', config.file, 'string')
H.check_type('force', config.force, 'table')
H.check_type('force.read', config.force.read, 'boolean')
H.check_type('force.write', config.force.write, 'boolean')
H.check_type('force.delete', config.force.delete, 'boolean')
H.check_type('hooks', config.hooks, 'table')
H.check_type('hooks.pre', config.hooks.pre, 'table')
H.check_type('hooks.pre.read', config.hooks.pre.read, 'function', true)
H.check_type('hooks.pre.write', config.hooks.pre.write, 'function', true)
H.check_type('hooks.pre.delete', config.hooks.pre.delete, 'function', true)
H.check_type('hooks.post', config.hooks.post, 'table')
H.check_type('hooks.post.read', config.hooks.post.read, 'function', true)
H.check_type('hooks.post.write', config.hooks.post.write, 'function', true)
H.check_type('hooks.post.delete', config.hooks.post.delete, 'function', true)
H.check_type('verbose', config.verbose, 'table')
H.check_type('verbose.read', config.verbose.read, 'boolean')
H.check_type('verbose.write', config.verbose.write, 'boolean')
H.check_type('verbose.delete', config.verbose.delete, 'boolean')
return config
end
H.apply_config = function(config)
MiniSessions.config = config
H.detect_sessions(config)
end
H.create_autocommands = function(config)
local gr = vim.api.nvim_create_augroup('MiniSessions', {})
if config.autoread then
local autoread = function()
if not H.is_something_shown() then MiniSessions.read() end
end
local opts = { group = gr, nested = true, callback = autoread, desc = 'Autoread latest session' }
vim.api.nvim_create_autocmd('VimEnter', opts)
end
if config.autowrite then
local autowrite = function()
if H.get_this_session() ~= '' then MiniSessions.write(nil, { force = true }) end
end
local opts = { group = gr, callback = autowrite, desc = 'Autowrite current session' }
vim.api.nvim_create_autocmd('VimLeavePre', opts)
end
end
H.is_disabled = function() return vim.g.minisessions_disable == true or vim.b.minisessions_disable == true end
H.get_config = function(config)
return vim.tbl_deep_extend('force', MiniSessions.config, vim.b.minisessions_config or {}, config or {})
end
-- Work with sessions ---------------------------------------------------------
H.detect_sessions = function(config)
config = H.get_config(config)
local res_global = config.directory == '' and {} or H.detect_sessions_global(config.directory)
local res_local = config.file == '' and {} or H.detect_sessions_local(config.file)
-- If there are both local and global session with same name, prefer local
MiniSessions.detected = vim.tbl_deep_extend('force', res_global, res_local)
end
H.detect_sessions_global = function(global_dir)
-- Ensure correct directory path: create if doesn't exist
global_dir = H.full_path(global_dir)
if vim.fn.isdirectory(global_dir) ~= 1 then
local ok, _ = pcall(vim.fn.mkdir, global_dir, 'p')
if not ok then
H.message(('%s is not a directory path.'):format(vim.inspect(global_dir)))
return {}
end
end
-- Find global sessions
local globs = vim.fn.globpath(global_dir, '*')
if #globs == 0 then return {} end
local res = {}
for _, f in pairs(vim.split(globs, '\n')) do
if H.is_readable_file(f) then
local s = H.new_session(f, 'global')
res[s.name] = s
end
end
return res
end
H.detect_sessions_local = function(local_file)
local f = vim.fn.getcwd() .. '/' .. local_file
if not H.is_readable_file(f) then return {} end
local s = H.new_session(f, 'local')
return { [s.name] = s }
end
H.new_session = function(session_path, session_type)
return {
modify_time = vim.fn.getftime(session_path),
name = vim.fn.fnamemodify(session_path, ':t'),
path = H.full_path(session_path),
type = session_type or H.get_session_type(session_path),
}
end
H.get_session_type = function(session_path)
if MiniSessions.config.directory == '' then return 'local' end
local session_dir = H.full_path(session_path)
local global_dir = H.full_path(MiniSessions.config.directory)
return session_dir == global_dir and 'global' or 'local'
end
H.validate_detected = function(session_name)
local is_detected = vim.tbl_contains(vim.tbl_keys(MiniSessions.detected), session_name)
if is_detected then return true end
H.error(('%s is not a name for detected session.'):format(vim.inspect(session_name)))
end
H.get_unsaved_listed_buffers = function()
return vim.tbl_filter(
function(buf_id) return vim.bo[buf_id].modified and vim.bo[buf_id].buflisted end,
vim.api.nvim_list_bufs()
)
end
H.get_this_session = function() return H.fs_normalize(vim.v.this_session) end
H.name_to_path = function(session_name)
if session_name == nil then
local this_session = H.get_this_session()
if this_session == '' then H.error('There is no active session. Supply non-nil session name.') end
return this_session
end
session_name = tostring(session_name)
if session_name == '' then H.error('Supply non-empty session name.') end
local session_dir = (session_name == MiniSessions.config.file) and vim.fn.getcwd() or MiniSessions.config.directory
return H.full_path(session_dir .. '/' .. session_name)
end
-- Utilities ------------------------------------------------------------------
H.error = function(msg) error('(mini.sessions) ' .. msg, 0) end
H.check_type = function(name, val, ref, allow_nil)
if type(val) == ref or (ref == 'callable' and vim.is_callable(val)) or (allow_nil and val == nil) then return end
H.error(string.format('`%s` should be %s, not %s', name, ref, type(val)))
end
H.echo = function(msg, is_important)
-- Construct message chunks
msg = type(msg) == 'string' and { { msg } } or msg
table.insert(msg, 1, { '(mini.sessions) ', 'WarningMsg' })
-- Avoid hit-enter-prompt
local max_width = vim.o.columns * math.max(vim.o.cmdheight - 1, 0) + vim.v.echospace
local chunks, tot_width = {}, 0
for _, ch in ipairs(msg) do
local new_ch = { vim.fn.strcharpart(ch[1], 0, max_width - tot_width), ch[2] }
table.insert(chunks, new_ch)
tot_width = tot_width + vim.fn.strdisplaywidth(new_ch[1])
if tot_width >= max_width then break end
end
-- Echo. Force redraw to ensure that it is effective (`:h echo-redraw`)
vim.cmd([[echo '' | redraw]])
vim.api.nvim_echo(chunks, is_important, {})
end
H.message = function(msg) H.echo(msg, true) end
H.default_opts = function(action)
local config = MiniSessions.config
return {
force = config.force[action],
verbose = config.verbose[action],
hooks = { pre = config.hooks.pre[action], post = config.hooks.post[action] },
}
end
H.is_readable_file = function(path) return vim.fn.isdirectory(path) ~= 1 and vim.fn.getfperm(path):sub(1, 1) == 'r' end
H.fs_normalize = function(...) return vim.fs.normalize(...) end
if vim.fn.has('nvim-0.9') == 0 then
H.fs_normalize = function(...) return vim.fs.normalize(...):gsub('(.)/+$', '%1') end
end
H.full_path = function(path) return H.fs_normalize(vim.fn.resolve(vim.fn.fnamemodify(path, ':p'))) end
H.is_something_shown = function()
-- Don't autoread session if Neovim is opened to show something. That is
-- when at least one of the following is true:
-- - There are files in arguments (like `nvim foo.txt` with new file).
if vim.fn.argc() > 0 then return true end
-- - Several buffers are listed (like session with placeholder buffers). That
-- means unlisted buffers (like from `nvim-tree`) don't affect decision.
local listed_buffers = vim.tbl_filter(
function(buf_id) return vim.fn.buflisted(buf_id) == 1 end,
vim.api.nvim_list_bufs()
)
if #listed_buffers > 1 then return true end
-- - Current buffer is meant to show something else
if vim.bo.filetype ~= '' then return true end
-- - Current buffer has any lines (something opened explicitly).
-- NOTE: Usage of `line2byte(line('$') + 1) < 0` seemed to be fine, but it
-- doesn't work if some automated changed was made to buffer while leaving it
-- empty (returns 2 instead of -1). This was also the reason of not being
-- able to test with child Neovim process from 'tests/helpers'.
local n_lines = vim.api.nvim_buf_line_count(0)
if n_lines > 1 then return true end
local first_line = vim.api.nvim_buf_get_lines(0, 0, 1, true)[1]
if string.len(first_line) > 0 then return true end
return false
end
H.possibly_execute = function(f, ...)
if f == nil then return end
return f(...)
end
return MiniSessions