feat: commands with cmp (#183)

lua/cmp_avante/commands.lua

@@ -0,0 +1,49 @@
+---@class source
+---@field sidebar avante.Sidebar
+local source = {}
+
+---@param sidebar avante.Sidebar
+function source.new(sidebar)
+  return setmetatable({
+    sidebar = sidebar,
+  }, { __index = source })
+end
+
+function source:is_available()
+  return vim.bo.filetype == "AvanteInput"
+end
+
+source.get_position_encoding_kind = function()
+  return "utf-8"
+end
+
+function source:get_trigger_characters()
+  return { "/" }
+end
+
+function source:get_keyword_pattern()
+  return [[\%(@\|#\|/\)\k*]]
+end
+
+function source:complete(_, callback)
+  local kind = require("cmp").lsp.CompletionItemKind.Function
+
+  local items = {}
+
+  local commands = self.sidebar:get_commands()
+
+  for _, command in ipairs(commands) do
+    table.insert(items, {
+      label = "/" .. command.name,
+      kind = kind,
+      detail = command.description,
+    })
+  end
+
+  callback({
+    items = items,
+    isIncomplete = false,
+  })
+end
+
+return source