LSP: Add textDocument/codeAction support (#11607)

* Add textDocument/codeAction

* Add callback for workspace/executeCommand
* Escape newlines in codeAction titles
* Return empty list in get_line_diagnostics if no buffer diagnostics
* Add stub documentation
* Validate context parameter in code_action
* Add support for edit in CodeAction responses
* Group diagnostics by line in vim.lsp.util.get_line_diagnostics()
* Advertise code action literal support

1 files changed, 29 insertions, 8 deletions

diff --git a/runtime/lua/vim/lsp/util.lua b/runtime/lua/vim/lsp/util.lua
index 099a77099b..c92a317d0c 100644
--- a/runtime/lua/vim/lsp/util.lua
+++ b/runtime/lua/vim/lsp/util.lua
@@ -720,19 +720,28 @@ do
     return severity_highlights[severity]
   end
 
-  function M.show_line_diagnostics()
+  function M.get_line_diagnostics()
     local bufnr = api.nvim_get_current_buf()
-    local line = api.nvim_win_get_cursor(0)[1] - 1
+    local linenr = api.nvim_win_get_cursor(0)[1] - 1
+
+    local buffer_diagnostics = M.diagnostics_by_buf[bufnr]
+
+    if not buffer_diagnostics then
+      return {}
+    end
+
+    local diagnostics_by_line = M.diagnostics_group_by_line(buffer_diagnostics)
+    return diagnostics_by_line[linenr] or {}
+  end
+
+  function M.show_line_diagnostics()
     -- local marks = api.nvim_buf_get_extmarks(bufnr, diagnostic_ns, {line, 0}, {line, -1}, {})
     -- if #marks == 0 then
     --   return
     -- end
     local lines = {"Diagnostics:"}
     local highlights = {{0, "Bold"}}
-
-    local buffer_diagnostics = M.diagnostics_by_buf[bufnr]
-    if not buffer_diagnostics then return end
-    local line_diagnostics = M.diagnostics_group_by_line(buffer_diagnostics)[line]
+    local line_diagnostics = M.get_line_diagnostics()
     if not line_diagnostics then return end
 
     for i, diagnostic in ipairs(line_diagnostics) do
@@ -1044,14 +1053,26 @@ function M.try_trim_markdown_code_blocks(lines)
 end
 
 local str_utfindex = vim.str_utfindex
-function M.make_position_params()
+local function make_position_param()
   local row, col = unpack(api.nvim_win_get_cursor(0))
   row = row - 1
   local line = api.nvim_buf_get_lines(0, row, row+1, true)[1]
   col = str_utfindex(line, col)
+  return { line = row; character = col; }
+end
+
+function M.make_position_params()
   return {
     textDocument = M.make_text_document_params();
-    position = { line = row; character = col; }
+    position = make_position_param()
+  }
+end
+
+function M.make_range_params()
+  local position = make_position_param()
+  return {
+    textDocument = { uri = vim.uri_from_bufnr(0) },
+    range = { start = position; ["end"] = position; }
   }
 end