feat(lsp): join multiple visually selected lines (RustLsp joinLines) (#339)

Author: mrcjkb

CHANGELOG.md

@@ -8,9 +8,13 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+### Added
+
+- LSP: Join multiple visually selected lines with `:RustLsp joinLines`.
+
 ### Fixed
 
-- Escape character inserted before `}` when applying code action
+- LSP: Escape character inserted before `}` when applying code action
   with `SnippetTextEdit` [[#303](https://github.com/mrcjkb/rustaceanvim/issues/303)].
 
 ## [4.18.2] - 2024-03-28

README.md

@@ -513,9 +513,8 @@ by setting the rust-analyzer
 	<b>Join lines</b>
   </summary>
 
-  Join selected lines into one, 
-  smartly fixing up whitespace, 
-  trailing commas, and braces.
+  Join selected lines into one, smartly fixing up whitespace, trailing commas, and braces.
+  Works with individual lines in normal mode and multiple lines in visual mode.
 
   ```vimscript
   :RustLsp joinLines

lua/rustaceanvim/commands/init.lua

@@ -109,8 +109,9 @@ local rustlsp_command_tbl = {
     bang = true,
   },
   joinLines = {
-    impl = function(_)
-      require('rustaceanvim.commands.join_lines')()
+    impl = function(_, opts)
+      local visual_mode = opts.range ~= 0
+      require('rustaceanvim.commands.join_lines')(visual_mode)
     end,
   },
   moveItem = {

lua/rustaceanvim/commands/join_lines.lua

@@ -2,9 +2,10 @@ local M = {}
 
 ---@alias lsp_join_lines_params { textDocument: lsp_text_document, ranges: lsp_range[] }
 
+---@param visual_mode boolean
 ---@return lsp_join_lines_params
-local function get_params()
-  local params = vim.lsp.util.make_range_params()
+local function get_params(visual_mode)
+  local params = visual_mode and vim.lsp.util.make_given_range_params() or vim.lsp.util.make_range_params()
   local range = params.range
 
   params.range = nil
@@ -21,8 +22,9 @@ local rl = require('rustaceanvim.rust_analyzer')
 
 --- Sends the request to rust-analyzer to get the TextEdits to join the lines
 --- under the cursor and applies them
-function M.join_lines()
-  rl.buf_request(0, 'experimental/joinLines', get_params(), handler)
+---@param visual_mode boolean
+function M.join_lines(visual_mode)
+  rl.buf_request(0, 'experimental/joinLines', get_params(visual_mode), handler)
 end
 
 return M.join_lines