fix caching

README.md

@@ -1,7 +1,5 @@
 # cp.nvim
 
-> ⚠️ **Warning**: as of 27/09/25, CodeForces upgraded their anti-scraping technology and support is thus (temporarily) broken. I am actively researching a way around this.
-
 **The definitive competitive programming environment for Neovim**
 
 Scrape problems, run tests, and debug solutions across multiple platforms with zero configuration.
@@ -29,7 +27,7 @@ cp.nvim follows a simple principle: **solve locally, submit remotely**.
 ### Basic Usage
 
 1. **Find a contest or problem** on the judge website
-2. **Set up locally** with `:CP <platform> <contest> [<problem>]`
+2. **Set up locally** with `:CP <platform> <contest> [--{lang=<lang>,debug}]`
 
    ```
    :CP codeforces 1848

lua/cp/cache.lua

@@ -87,7 +87,7 @@ function M.get_contest_data(platform, contest_id)
   end
 
   local contest_data = cache_data[platform][contest_id]
-  if not contest_data then
+  if not contest_data or vim.tbl_isempty(contest_data) then
     return nil
   end
 

lua/cp/commands/init.lua

@@ -74,11 +74,8 @@ local function parse_command(args)
       }
     elseif #filtered_args == 3 then
       return {
-        type = 'full_setup',
+        type = 'error',
-        platform = first,
+        message = 'Setup contests with :CP <platform> <contest_id> [--{lang=<lang>,debug}]',
-        contest = filtered_args[2],
-        problem = filtered_args[3],
-        language = language,
       }
     else
       return { type = 'error', message = 'Too many arguments' }
@@ -88,16 +85,6 @@ local function parse_command(args)
   if state.get_platform() and state.get_contest_id() then
     local cache = require('cp.cache')
     cache.load()
-    local contest_data =
-      cache.get_contest_data(state.get_platform() or '', state.get_contest_id() or '')
-    if contest_data and contest_data.problems then
-      local problem_ids = vim.tbl_map(function(prob)
-        return prob.id
-      end, contest_data.problems)
-      if vim.tbl_contains(problem_ids, first) then
-        return { type = 'problem_switch', problem = first, language = language }
-      end
-    end
     return {
       type = 'error',
       message = ("invalid subcommand '%s'"):format(first),
@@ -149,24 +136,10 @@ function M.handle_command(opts)
   if cmd.type == 'contest_setup' then
     local setup = require('cp.setup')
     if setup.set_platform(cmd.platform) then
-      setup.setup_contest(cmd.platform, cmd.contest, nil, cmd.language)
+      setup.setup_contest(cmd.platform, cmd.contest, cmd.language, nil)
     end
     return
   end
-
-  if cmd.type == 'full_setup' then
-    local setup = require('cp.setup')
-    if setup.set_platform(cmd.platform) then
-      setup.setup_contest(cmd.platform, cmd.contest, cmd.problem, cmd.language)
-    end
-    return
-  end
-
-  if cmd.type == 'problem_switch' then
-    local setup = require('cp.setup')
-    setup.setup_problem(state.get_contest_id() or '', cmd.problem, cmd.language)
-    return
-  end
 end
 
 return M

lua/cp/restore.lua

@@ -15,7 +15,7 @@ function M.restore_from_current_file()
   local file_state = cache.get_file_state(current_file)
   if not file_state then
     logger.log(
-      'No cached state found for current file. Use :CP <platform> <contest> <problem> [...] first.',
+      'No cached state found for current file. Use :CP <platform> <contest> [--{lang=<lang>,debug}...] first.',
       vim.log.levels.ERROR
     )
     return false
@@ -37,7 +37,12 @@ function M.restore_from_current_file()
   state.set_contest_id(file_state.contest_id)
   state.set_problem_id(file_state.problem_id)
 
-  setup.setup_problem(file_state.contest_id, file_state.problem_id, file_state.language)
+  setup.setup_contest(
+    file_state.platform,
+    file_state.contest_id,
+    file_state.language,
+    file_state.problem_id
+  )
 
   return true
 end

lua/cp/setup.lua

@@ -28,10 +28,12 @@ function M.set_platform(platform)
   return true
 end
 
-local function scrape_contest_problems(platform, contest_id, problems)
+local function scrape_contest_problems(problems)
   cache.load()
   local missing_problems = {}
 
+  local platform, contest_id = state.get_platform() or '', state.get_contest_id() or ''
+
   for _, prob in ipairs(problems) do
     local cached_tests = cache.get_test_cases(platform, contest_id, prob.id)
     if not cached_tests then
@@ -40,7 +42,7 @@ local function scrape_contest_problems(platform, contest_id, problems)
   end
 
   if vim.tbl_isempty(missing_problems) then
-    logger.log(('All problems already cached for %s contest %s'):format(platform, contest_id))
+    logger.log(('All problems already cached for %s contest %s.'):format(platform, contest_id))
     return
   end
 
@@ -67,50 +69,60 @@ local function scrape_contest_problems(platform, contest_id, problems)
   end
 end
 
-function M.setup_contest(platform, contest_id, problem_id, language)
+function M.setup_contest(platform, contest_id, language, problem_id)
-  if not state.get_platform() then
+  if not platform then
-    logger.log('No platform configured. Use :CP <platform> <contest> [...] first.')
+    logger.log('No platform configured. Use :CP <platform> <contest> [--{lang=<lang>,debug} first.')
     return
   end
 
   local config = config_module.get_config()
 
   if not vim.tbl_contains(config.scrapers, platform) then
-    logger.log(('Scraping disabled for %s - aborting.'):format(platform), vim.log.levels.WARN)
+    logger.log(('Scraping disabled for %s.'):format(platform), vim.log.levels.WARN)
     return
   end
 
   state.set_contest_id(contest_id)
-  -- TODO: should check cache here, & other uses of gt_contest_data validate them
+  local contest_data = cache.get_contest_data(platform, contest_id)
-  logger.log('Fetching contests problems...', vim.log.levels.INFO, true)
 
+  if
+    not contest_data
+    or not contest_data.problems
+    or (problem_id and not cache.get_test_cases(platform, contest_id, problem_id))
+  then
+    logger.log('Fetching contests problems...', vim.log.levels.INFO, true)
     scraper.scrape_contest_metadata(platform, contest_id, function(result)
       local problems = result.problems
 
       cache.set_contest_data(platform, contest_id, problems)
 
-    logger.log(('Found %d problems for %s contest %s'):format(#problems, platform, contest_id))
+      logger.log(('Found %d problems for %s contest %s.'):format(#problems, platform, contest_id))
 
-    local target_problem = problem_id or problems[1].id
+      M.setup_problem(problem_id or problems[1].id, language)
 
-    M.setup_problem(contest_id, target_problem, language)
+      scrape_contest_problems(problems)
-
-    scrape_contest_problems(platform, contest_id, problems)
     end)
+  else
+    M.setup_problem(problem_id, language)
+  end
 end
 
-function M.setup_problem(contest_id, problem_id, language)
+---@param problem_id string
-  if not state.get_platform() then
+---@param language? string
-    logger.log('No platform set. run :CP <platform> <contest> first', vim.log.levels.ERROR)
+function M.setup_problem(problem_id, language)
+  local platform = state.get_platform()
+  if not platform then
+    logger.log(
+      'No platform set. run :CP <platform> <contest> [--{lang=<lang>,debug}]',
+      vim.log.levels.ERROR
+    )
     return
   end
 
-  local config = config_module.get_config()
-  local platform = state.get_platform() or ''
-
-  state.set_contest_id(contest_id)
   state.set_problem_id(problem_id)
 
+  local config = config_module.get_config()
+
   vim.schedule(function()
     vim.cmd.only({ mods = { silent = true } })
 
@@ -149,18 +161,30 @@ function M.setup_problem(contest_id, problem_id, language)
       config.hooks.setup_code(state)
     end
 
-    cache.set_file_state(vim.fn.expand('%:p'), platform, contest_id, problem_id, language)
+    cache.set_file_state(
+      vim.fn.expand('%:p'),
+      platform,
+      state.get_contest_id() or '',
+      state.get_problem_id(),
+      language
+    )
   end)
 end
 
 function M.navigate_problem(direction, language)
+  if direction == 0 then
+    return
+  end
+
+  direction = direction > 0 and 1 or -1
+
   local platform = state.get_platform()
   local contest_id = state.get_contest_id()
   local current_problem_id = state.get_problem_id()
 
   if not platform or not contest_id or not current_problem_id then
     logger.log(
-      'No platform configured. Use :CP <platform> <contest> [...] first.',
+      'No platform configured. Use :CP <platform> <contest> [--{lang=<lang>,debug}] first.',
       vim.log.levels.ERROR
     )
     return
@@ -169,7 +193,13 @@ function M.navigate_problem(direction, language)
   cache.load()
   local contest_data = cache.get_contest_data(platform, contest_id)
   if not contest_data or not contest_data.problems then
-    logger.log('No contest data available', vim.log.levels.ERROR)
+    logger.log(
+      ('No data available for %s contest %s.'):format(
+        constants.PLATFORM_DISPLAY_NAMES[platform],
+        contest_id
+      ),
+      vim.log.levels.ERROR
+    )
     return
   end
 
@@ -187,12 +217,7 @@ function M.navigate_problem(direction, language)
     return
   end
 
-  local cp = require('cp')
+  M.setup_contest(platform, contest_id, language, problems[new_index].id)
-  local args = { platform, contest_id, problems[new_index].id }
-  if language then
-    vim.list_extend(args, { '--lang', language })
-  end
-  cp.handle_command({ fargs = args })
 end
 
 return M

lua/cp/snippets.lua

@@ -4,7 +4,7 @@ local logger = require('cp.log')
 function M.setup(config)
   local ok, ls = pcall(require, 'luasnip')
   if not ok then
-    logger.log('LuaSnip not available - snippets disabled', vim.log.levels.INFO)
+    logger.log('LuaSnip not available - snippets are disabled.', vim.log.levels.INFO, true)
     return
   end
 

lua/cp/ui/panel.lua

@@ -23,12 +23,12 @@ function M.toggle_interactive()
       state.saved_interactive_session = nil
     end
     state.set_active_panel(nil)
-    logger.log('interactive closed')
+    logger.log('Interactive panel closed.')
     return
   end
 
   if state.get_active_panel() then
-    logger.log('another panel is already active', vim.log.levels.ERROR)
+    logger.log('Another panel is already active.', vim.log.levels.WARN)
     return
   end
 
@@ -36,7 +36,7 @@ function M.toggle_interactive()
 
   if not platform then
     logger.log(
-      'No platform configured. Use :CP <platform> <contest> [...] first.',
+      'No platform configured. Use :CP <platform> <contest> [--{lang=<lang>,debug}] first.',
       vim.log.levels.ERROR
     )
     return
@@ -44,7 +44,7 @@ function M.toggle_interactive()
 
   if not contest_id then
     logger.log(
-      ('No contest %s configured for platform %s. Use :CP <platform> <contest> <problem> to set up first.'):format(
+      ('No contest %s configured for platform %s. Use :CP <platform> <contest> [--{lang=<lang>,debug}] to set up first.'):format(
         contest_id,
         platform
       ),
@@ -62,12 +62,8 @@ function M.toggle_interactive()
   local cache = require('cp.cache')
   cache.load()
   local contest_data = cache.get_contest_data(platform, contest_id)
-  vim.print('checking cache - contes_data (DLETE ME): ', contest_data)
   if contest_data and not contest_data.interactive then
-    logger.log(
+    logger.log('This is NOT an interactive problem. Use :CP run instead.', vim.log.levels.WARN)
-      'This is NOT an interactive problem. Use :CP run instead - aborting.',
-      vim.log.levels.WARN
-    )
     return
   end
 
@@ -140,7 +136,7 @@ function M.toggle_run_panel(is_debug)
 
   if not contest_id then
     logger.log(
-      ('No contest %s configured for platform %s. Use :CP <platform> <contest> <problem> to set up first.'):format(
+      ('No contest %s configured for platform %s. Use :CP <platform> <contest> [--{lang=<lang>,debug}] to set up first.'):format(
         contest_id,
         platform
       ),
@@ -159,15 +155,12 @@ function M.toggle_run_panel(is_debug)
   cache.load()
   local contest_data = cache.get_contest_data(platform, contest_id)
   if contest_data and contest_data.interactive then
-    logger.log(
+    logger.log('This is an interactive problem. Use :CP interact instead.', vim.log.levels.WARN)
-      'This is an interactive problem. Use :CP interact instead - aborting.',
-      vim.log.levels.WARN
-    )
     return
   end
 
   logger.log(
-    ('run panel: platform=%s, contest=%s, problem=%s'):format(
+    ('Run panel: platform=%s, contest=%s, problem=%s'):format(
       tostring(platform),
       tostring(contest_id),
       tostring(problem_id)