Fix: Discussion + Note Creation Bugs (#151)

This MR is an attempt to resolve some of the issues this plugin is experiencing with Gitlab's API surrounding comments, in particular the specifics around when to send the "old line" versus "new line" and the file hashes.

This is a PATCH release.

lua/gitlab/actions/discussions/signs.lua

@@ -192,7 +192,7 @@ M.parse_diagnostics_from_discussions = function(discussions)
         return {}, {}, string.format("Unsupported line range type found for discussion %s", discussion.id)
       end
     else -- Diagnostics for single line discussions.
-      if first_note.position.new_line ~= nil then
+      if first_note.position.new_line ~= nil and first_note.position.old_line == nil then
         local new_diagnostic = {
           lnum = first_note.position.new_line - 1,
         }
@@ -306,7 +306,7 @@ M.parse_signs_from_discussions = function(discussions)
       local sign = vim.tbl_deep_extend("force", {
         id = first_note.id,
       }, base_sign)
-      if first_note.position.new_line ~= nil then
+      if first_note.position.new_line ~= nil and first_note.position.old_line == nil then
         table.insert(new_signs, vim.tbl_deep_extend("force", { lnum = first_note.position.new_line }, sign))
       end
       if first_note.position.old_line ~= nil then

lua/gitlab/actions/discussions/winbar.lua

@@ -53,7 +53,9 @@ M.update_winbar = function(discussions, unlinked_discussions, base_title)
   local d = require("gitlab.actions.discussions")
   local winId = d.split.winid
   local c = content(discussions, unlinked_discussions, base_title)
+  if vim.wo[winId] then
     vim.wo[winId].winbar = c
+  end
 end
 
 return M

lua/gitlab/reviewer/diffview.lua

@@ -75,7 +75,12 @@ M.jump = function(file_name, new_line, old_line, opts)
       end
       async.await(view:set_file(file))
       -- TODO: Ranged comments on unchanged lines will have both a
-      -- new line and a old line. We need to distinguish them somehow from
+      -- new line and a old line.
+      --
+      -- The same is true when the user leaves a single-line comment
+      -- on an unchanged line in the "b" buffer.
+      --
+      -- We need to distinguish them somehow from
       -- range comments (which also have this) so that we can know
       -- which buffer to jump to. Right now, we jump to the wrong
       -- buffer for ranged comments on unchanged lines.
@@ -100,8 +105,11 @@ M.get_location = function(range)
     u.notify("Diffview reviewer must be initialized first", vim.log.levels.ERROR)
     return
   end
+
   local bufnr = vim.api.nvim_get_current_buf()
-  local current_line = vim.api.nvim_win_get_cursor(0)[1]
+
+  -- If there's a range, use the start of the visual selection, not the current line
+  local current_line = range and range.start_line or vim.api.nvim_win_get_cursor(0)[1]
 
   -- check if we are in the diffview tab
   local tabnr = vim.api.nvim_get_current_tabpage()
@@ -120,7 +128,11 @@ M.get_location = function(range)
   local result = {}
   local type
   local is_new
-  if layout.a.file.bufnr == bufnr then
+
+  if
+    layout.a.file.bufnr == bufnr
+    or (M.lines_are_same(view.cur_layout) and layout.b.file.bufnr == bufnr and range == nil)
+  then
     result.file_name = layout.a.file.path
     result.old_line = current_line
     type = "old"
@@ -156,6 +168,16 @@ M.get_location = function(range)
     result.new_line = current_line_info.new_line
   end
 
+  -- If users leave single-line comments in the new buffer that should be in the old buffer, we can
+  -- tell because the line will not have changed. Send the correct payload.
+  if M.lines_are_same(view.cur_layout) and layout.b.file.bufnr == bufnr and range == nil then
+    local a_win = u.get_win_from_buf(layout.a.file.bufnr)
+    local a_cursor = vim.api.nvim_win_get_cursor(a_win)[1]
+    result.old_line = a_cursor
+    result.new_line = a_cursor
+    type = "old"
+  end
+
   if range == nil then
     return result
   end
@@ -194,6 +216,17 @@ M.get_lines = function(start_line, end_line)
   return vim.api.nvim_buf_get_lines(0, start_line - 1, end_line, false)
 end
 
+---@return boolean
+M.lines_are_same = function(layout)
+  local a_win = u.get_win_from_buf(layout.a.file.bufnr)
+  local b_win = u.get_win_from_buf(layout.b.file.bufnr)
+  local a_cursor = vim.api.nvim_win_get_cursor(a_win)[1]
+  local b_cursor = vim.api.nvim_win_get_cursor(b_win)[1]
+  local line_a = u.get_line_content(layout.a.file.bufnr, a_cursor)
+  local line_b = u.get_line_content(layout.b.file.bufnr, b_cursor)
+  return line_a == line_b
+end
+
 ---Get currently shown file
 M.get_current_file = function()
   local view = diffview_lib.get_current_view()