Implement action selection menu for :SessionManager (#109)

Co-authored-by: Ali Shahid <shaeinst@gmail.com>

lua/session_manager/init.lua

@@ -7,6 +7,24 @@ local session_manager = {}
 ---@param values table
 function session_manager.setup(values) setmetatable(config, { __index = vim.tbl_extend('force', config.defaults, values) }) end
 
+-- Displays action selection menu for :SessionManager
+function session_manager.available_commands()
+  local commands = {}
+  for cmd, _ in pairs(session_manager) do
+    if cmd ~= 'setup' and cmd ~= 'available_commands' and cmd ~= 'autosave_session' then
+      table.insert(commands, cmd)
+    end
+  end
+  vim.ui.select(commands, {
+    prompt = 'Session Manager',
+    format_item = function(item) return item:sub(1, 1):upper() .. item:sub(2):gsub('_', ' ') end,
+  }, function(item)
+    if item then
+      session_manager[item]()
+    end
+  end)
+end
+
 --- Selects a session a loads it.
 ---@param discard_current boolean: If `true`, do not check for unsaved buffers.
 function session_manager.load_session(discard_current)

lua/session_manager/subcommands.lua

@@ -29,6 +29,10 @@ end
 --- Run specified subcommand received from completion.
 ---@param subcommand table
 function subcommands.run(subcommand)
+  if subcommand.args == '' then
+    session_manager.available_commands()
+    return
+  end
   local subcommand_func = session_manager[subcommand.fargs[1]]
   if not subcommand_func then
     utils.notify('No such subcommand: ' .. subcommand.fargs[1], vim.log.levels.ERROR)

plugin/session_manager.lua

@@ -6,7 +6,7 @@ end
 local subcommands = require('session_manager.subcommands')
 local session_manager = require('session_manager')
 
-vim.api.nvim_create_user_command('SessionManager', subcommands.run, { nargs = 1, bang = true, complete = subcommands.complete, desc = 'Run session manager command' })
+vim.api.nvim_create_user_command('SessionManager', subcommands.run, { nargs = '*', bang = true, complete = subcommands.complete, desc = 'Run session manager command' })
 
 local session_manager_group = vim.api.nvim_create_augroup('SessionManager', {})
 vim.api.nvim_create_autocmd({ 'VimEnter' }, {