feat: add \:Pending done <id>\ command (#76)

Toggles a task's done/pending status by ID from the command line,
matching the buffer \`<CR>\` behaviour including recurrence spawning.
Tab-completes active task IDs.

lua/pending/init.lua

@@ -430,6 +430,48 @@ function M.toggle_complete()
   end
 end
 
+---@param id_str string
+---@return nil
+function M.done(id_str)
+  local id = tonumber(id_str)
+  if not id then
+    log.error('Invalid task ID: ' .. tostring(id_str))
+    return
+  end
+  local s = get_store()
+  s:load()
+  local task = s:get(id)
+  if not task then
+    log.error('No task with ID ' .. id .. '.')
+    return
+  end
+  local was_done = task.status == 'done'
+  if was_done then
+    s:update(id, { status = 'pending', ['end'] = vim.NIL })
+  else
+    if task.recur and task.due then
+      local recur = require('pending.recur')
+      local mode = task.recur_mode or 'scheduled'
+      local next_date = recur.next_due(task.due, task.recur, mode)
+      s:add({
+        description = task.description,
+        category = task.category,
+        priority = task.priority,
+        due = next_date,
+        recur = task.recur,
+        recur_mode = task.recur_mode,
+      })
+    end
+    s:update(id, { status = 'done' })
+  end
+  _save_and_notify()
+  local bufnr = buffer.bufnr()
+  if bufnr and vim.api.nvim_buf_is_valid(bufnr) then
+    buffer.render(bufnr)
+  end
+  log.info('Task #' .. id .. ' marked ' .. (was_done and 'pending' or 'done'))
+end
+
 ---@return nil
 function M.toggle_priority()
   local bufnr = buffer.bufnr()
@@ -856,6 +898,8 @@ function M.command(args)
   local cmd, rest = args:match('^(%S+)%s*(.*)')
   if cmd == 'add' then
     M.add(rest)
+  elseif cmd == 'done' then
+    M.done(rest:match('^(%S+)'))
   elseif cmd == 'edit' then
     local id_str, edit_rest = rest:match('^(%S+)%s*(.*)')
     M.edit(id_str, edit_rest)

lua/pending/sync/oauth.lua

@@ -350,7 +350,7 @@ end
 function OAuthClient:auth(on_complete)
   local creds = self:resolve_credentials()
   if creds.client_id == BUNDLED_CLIENT_ID then
-    log.error(self.name .. ': no credentials configured — run :Pending ' .. self.name .. ' setup')
+    log.error(self.name .. ': no credentials configured — run :Pending auth')
     return
   end
   local port = self.port

plugin/pending.lua

@@ -167,7 +167,7 @@ end, {
   nargs = '*',
   complete = function(arg_lead, cmd_line)
     local pending = require('pending')
-    local subcmds = { 'add', 'archive', 'auth', 'due', 'edit', 'filter', 'undo' }
+    local subcmds = { 'add', 'archive', 'auth', 'done', 'due', 'edit', 'filter', 'undo' }
     for _, b in ipairs(pending.sync_backends()) do
       table.insert(subcmds, b)
     end
@@ -200,6 +200,16 @@ end, {
       end
       return filtered
     end
+    if cmd_line:match('^Pending%s+done%s') then
+      local store = require('pending.store')
+      local s = store.new(store.resolve_path())
+      s:load()
+      local ids = {}
+      for _, task in ipairs(s:active_tasks()) do
+        table.insert(ids, tostring(task.id))
+      end
+      return filter_candidates(arg_lead, ids)
+    end
     if cmd_line:match('^Pending%s+edit') then
       return complete_edit(arg_lead, cmd_line)
     end