feat(cli): :CP <problem_id>

doc/cp.nvim.txt

@@ -64,10 +64,12 @@ COMMANDS                                                        *cp-commands*
                                 Stops at last problem (no wrapping).
 
 
-        Navigation Commands ~
             :CP prev            Navigate to previous problem in current contest.
                                 Stops at first problem (no wrapping).
 
+            :CP {problem_id}    Jump to problem {problem_id} in a contest.
+                                Requires that a contest has already been set up.
+
         Cache Commands ~
             :CP cache clear [contest]
                                 Clear the cache data (contest list, problem

lua/cp/commands/init.lua

@@ -14,6 +14,7 @@ local actions = constants.ACTIONS
 ---@field message? string
 ---@field contest? string
 ---@field platform? string
+---@field problem_id? string
 
 --- Turn raw args into normalized structure to later dispatch
 ---@param args string[] The raw command-line mode args
@@ -70,16 +71,14 @@ local function parse_command(args)
     end
   end
 
-  if state.get_platform() and state.get_contest_id() then
-    local cache = require('cp.cache')
-    cache.load()
+  if #args == 1 then
     return {
-      type = 'error',
-      message = ("invalid subcommand '%s'"):format(first),
+      type = 'problem_jump',
+      problem_id = first,
     }
   end
 
-  return { type = 'error', message = 'Unknown command or no contest context' }
+  return { type = 'error', message = 'Unknown command or no contest context.' }
 end
 
 --- Core logic for handling `:CP ...` commands
@@ -113,6 +112,30 @@ function M.handle_command(opts)
       local picker = require('cp.commands.picker')
       picker.handle_pick_action()
     end
+  elseif cmd.type == 'problem_jump' then
+    local platform = state.get_platform()
+    local contest_id = state.get_contest_id()
+    local problem_id = cmd.problem_id
+
+    if not (platform and contest_id) then
+      logger.log('No contest is currently active.', vim.log.levels.ERROR)
+      return
+    end
+
+    local cache = require('cp.cache')
+    cache.load()
+    local contest_data = cache.get_contest_data(platform, contest_id)
+
+    if not (contest_data and contest_data.index_map and contest_data.index_map[problem_id]) then
+      logger.log(
+        ("%s contest '%s' has no problem '%s'."):format(platform, contest_id, problem_id),
+        vim.log.levels.ERROR
+      )
+      return
+    end
+
+    local setup = require('cp.setup')
+    setup.setup_contest(platform, contest_id, problem_id)
   elseif cmd.type == 'cache' then
     local cache_commands = require('cp.commands.cache')
     cache_commands.handle_cache_command(cmd)

plugin/cp.lua

@@ -23,22 +23,26 @@ end, {
     if num_args == 2 then
       local candidates = {}
       local state = require('cp.state')
-      local platform, contest_id = state.get_platform(), state.get_contest_id()
+      local platform = state.get_platform()
+      local contest_id = state.get_contest_id()
+
       if platform and contest_id then
         vim.list_extend(candidates, actions)
         local cache = require('cp.cache')
         cache.load()
         local contest_data = cache.get_contest_data(platform, contest_id)
-        if contest_data and contest_data.problems then
-          for _, problem in ipairs(contest_data.problems) do
-            table.insert(candidates, problem.id)
-          end
+
+        if contest_data and contest_data.index_map then
+          local ids = vim.tbl_keys(contest_data.index_map)
+          table.sort(ids)
+          vim.list_extend(candidates, ids)
         end
       else
         vim.list_extend(candidates, platforms)
         table.insert(candidates, 'cache')
         table.insert(candidates, 'pick')
       end
+
       return vim.tbl_filter(function(cmd)
         return cmd:find(ArgLead, 1, true) == 1
       end, candidates)