feat(lsp): <Plug> mapping for hover actions (#510)

Author: mrcjkb

README.md

@@ -403,6 +403,18 @@ vim.keymap.set(
  By default, this plugin replaces Neovim's built-in hover handler with hover
  actions, so you can also use `vim.lsp.buf.hover()`.
 
+ You can invoke a hover action by switching to the hover window and entering `<CR>`
+ on the respective line, or with a keymap for the `<Plug>RustHoverAction` mapping,
+ which accepts a `<count>` prefix as the (1-based) index of the hover action to invoke.
+ 
+ For example, if you set the following keymap:
+ 
+ ```lua
+ vim.keymap.set('n', '<space>a', '<Plug>RustHoverAction')
+ ```
+ 
+ you can invoke the third hover action with `3<space>a`.
+
 ![](https://github.com/mrcjkb/rustaceanvim/assets/12857160/c7b6c730-4439-47b0-9a75-7ea4e6831f7a)
 
 </details>

lua/rustaceanvim/hover_actions.lua

@@ -30,10 +30,8 @@ end
 -- run the command under the cursor, if the thing under the cursor is not the
 -- command then do nothing
 ---@param ctx table
-local function run_command(ctx)
-  local winnr = vim.api.nvim_get_current_win()
-  local line = vim.api.nvim_win_get_cursor(winnr)[1]
-
+---@param line integer
+local function run_command(ctx, line)
   if line > #_state.commands then
     return
   end
@@ -132,8 +130,13 @@ function M.handler(_, result, ctx)
 
   -- run the command under the cursor
   vim.keymap.set('n', '<CR>', function()
-    run_command(ctx)
+    local line = vim.api.nvim_win_get_cursor(winnr)[1]
+    run_command(ctx, line)
   end, { buffer = bufnr, noremap = true, silent = true })
+  vim.keymap.set('n', '<Plug>RustHoverAction', function()
+    local line = math.max(vim.v.count, 1)
+    run_command(ctx, line)
+  end, { buffer = vim.api.nvim_get_current_buf(), noremap = true, silent = true })
 end
 
 local rl = require('rustaceanvim.rust_analyzer')