feat: repo map (#496)

* feat: repo map

* chore: remove breakline

* chore: remove spaces

* fix: golang public method

* feat: mentions for editing input

lua/cmp_avante/mentions.lua

@@ -0,0 +1,43 @@
+---@class mentions_source
+---@field mentions {description: string, command: AvanteMentions, details: string, shorthelp?: string, callback?: AvanteMentionCallback}[]
+---@field bufnr integer
+local mentions_source = {}
+
+---@param mentions {description: string, command: AvanteMentions, details: string, shorthelp?: string, callback?: AvanteMentionCallback}[]
+---@param bufnr integer
+function mentions_source.new(mentions, bufnr)
+  ---@type cmp.Source
+  return setmetatable({
+    mentions = mentions,
+    bufnr = bufnr,
+  }, { __index = mentions_source })
+end
+
+function mentions_source:is_available() return vim.api.nvim_get_current_buf() == self.bufnr end
+
+mentions_source.get_position_encoding_kind = function() return "utf-8" end
+
+function mentions_source:get_trigger_characters() return { "@" } end
+
+function mentions_source:get_keyword_pattern() return [[\%(@\|#\|/\)\k*]] end
+
+function mentions_source:complete(_, callback)
+  local kind = require("cmp").lsp.CompletionItemKind.Variable
+
+  local items = {}
+
+  for _, mention in ipairs(self.mentions) do
+    table.insert(items, {
+      label = "@" .. mention.command .. " ",
+      kind = kind,
+      detail = mention.details,
+    })
+  end
+
+  callback({
+    items = items,
+    isIncomplete = false,
+  })
+end
+
+return mentions_source