feat: Add code actions support

Uses the default handler, mapped to 'a'

lua/symbols-outline.lua

@@ -143,6 +143,10 @@ local function setup_keymaps(bufnr)
     vim.api.nvim_buf_set_keymap(bufnr, "n", "r",
                                 ":lua require('symbols-outline.rename').rename()<Cr>",
                                 {})
+    -- code actions
+    vim.api.nvim_buf_set_keymap(bufnr, "n", "a",
+                                ":lua require('symbols-outline.code_action').show_code_actions()<Cr>",
+                                {})
     -- close outline when escape is pressed
     vim.api.nvim_buf_set_keymap(bufnr, "n", "<Esc>", ":bw!<Cr>",{})
 end

lua/symbols-outline/code_action.lua

@@ -0,0 +1,31 @@
+local vim = vim
+
+local main = require('symbols-outline')
+
+local M = {}
+
+local function get_action_params(node, winnr)
+    local bufnr = vim.api.nvim_win_get_buf(winnr)
+    local fn = "file://" .. vim.api.nvim_buf_get_name(bufnr)
+
+    local pos = {line = node.line, character = node.character}
+    local diagnostics = vim.lsp.diagnostic.get_line_diagnostics(bufnr, node.line)
+    return {
+        textDocument = {uri = fn},
+        range = {start = pos, ["end"] = pos},
+        context = {diagnostics = diagnostics},
+        bufnr = bufnr
+    }
+end
+
+function M.show_code_actions()
+    local current_line = vim.api.nvim_win_get_cursor(main.state.outline_win)[1]
+    local node = main.state.flattened_outline_items[current_line]
+
+    local params = get_action_params(node, main.state.code_win)
+
+    vim.lsp.buf_request(params.bufnr, "textDocument/codeAction", params,
+                        vim.lsp.handlers["textDocument/codeAction"])
+end
+
+return M