Draft: Feat: Add suggestions functionality

doc/gitlab.nvim.txt

@@ -223,11 +223,21 @@ you call this function with no values the defaults will be used:
           toggle_unresolved_discussions = "U", -- Open or close all unresolved discussions
           refresh_data = "<C-R>", -- Refresh the data in the view by hitting Gitlab's APIs again
           print_node = "<leader>p", -- Print the current node (for debugging)
+          edit_suggestion = "se", -- Edit comment with suggestion preview in a new tab
+          reply_with_suggestion = "sr", -- Reply to comment with a suggestion preview in a new tab
+          apply_suggestion = "sa", -- Apply the suggestion to the local file with a preview in a new tab
+        },
+        suggestion_preview = {
+          apply_changes = "ZZ", -- Close suggestion preview tab, and post suggestion comment to Gitlab (and discard changes to local file) or "apply" changes to local file
+          discard_changes = "ZQ", -- Close suggestion preview tab and discard changes to local file
+          attach_file = "ZA", -- Attach a file from the `settings.attachment_dir`
+          paste_default_suggestion = "glS", -- Paste the default suggestion below the cursor (overrides default "glS" (start review) keybinding for the "Note" buffer)
         },
         reviewer = {
           disable_all = false, -- Disable all default mappings for the reviewer windows
           create_comment = "c", -- Create a comment for the lines that the following {motion} moves over. Repeat the key(s) for creating comment for the current line
           create_suggestion = "s", -- Create a suggestion for the lines that the following {motion} moves over. Repeat the key(s) for creating comment for the current line
+          create_suggestion_with_preview = "S", -- In a new tab create a suggestion with a diff preview for the lines that the following {motion} moves over. Repeat the key(s) for creating comment for the current line
           move_to_discussion_tree = "a", -- Jump to the comment in the discussion tree
         },
       },
@@ -539,9 +549,11 @@ emojis that you have responded with.
 UPLOADING FILES                                  *gitlab.nvim.uploading-files*
 
 To attach a file to an MR description, reply, comment, and so forth use the
-`keymaps.popup.perform_linewise_action` keybinding when the popup is open.
-This will open a picker that will look for files in the directory you specify
-in the `settings.attachment_dir` folder (this must be an absolute path).
+`keymaps.popup.perform_linewise_action` keybinding when the popup is open (or
+the `keymaps.suggestion_preview.attach_file` in the comment buffer of the
+suggestion preview). This will open a picker that will look for files in the
+directory you specify in the `settings.attachment_dir` folder (this must be an
+absolute path).
 
 When you have picked the file, it will be added to the current buffer at the
 current line.

lua/gitlab/actions/comment.lua

@@ -21,18 +21,25 @@ local M = {
   comment_popup = nil,
 }
 
+---Decide if the comment is a draft based on the draft popup field.
+---@return boolean|nil is_draft True if the draft popup exists and the string it contains converts to `true`.
+local get_draft_value_from_popup = function()
+  local buf_is_valid = M.draft_popup and M.draft_popup.bufnr and vim.api.nvim_buf_is_valid(M.draft_popup.bufnr)
+  return buf_is_valid and u.string_to_bool(u.get_buffer_text(M.draft_popup.bufnr))
+end
+
 ---Fires the API that sends the comment data to the Go server, called when you "confirm" creation
 ---via the M.settings.keymaps.popup.perform_action keybinding
 ---@param text string comment text
 ---@param unlinked boolean if true, the comment is not linked to a line
 ---@param discussion_id string | nil The ID of the discussion to which the reply is responding, nil if not a reply
-local confirm_create_comment = function(text, unlinked, discussion_id)
+M.confirm_create_comment = function(text, unlinked, discussion_id)
   if text == nil then
     u.notify("Reviewer did not provide text of change", vim.log.levels.ERROR)
     return
   end
 
-  local is_draft = M.draft_popup and u.string_to_bool(u.get_buffer_text(M.draft_popup.bufnr))
+  local is_draft = get_draft_value_from_popup() or state.settings.discussion_tree.draft_mode
 
   -- Creating a normal reply to a discussion
   if discussion_id ~= nil and not is_draft then
@@ -188,13 +195,13 @@ M.create_comment_layout = function(opts)
   ---Keybinding for focus on draft section
   popup.set_popup_keymaps(M.draft_popup, function()
     local text = u.get_buffer_text(M.comment_popup.bufnr)
-    confirm_create_comment(text, unlinked, opts.discussion_id)
+    M.confirm_create_comment(text, unlinked, opts.discussion_id)
     vim.api.nvim_set_current_win(current_win)
   end, miscellaneous.toggle_bool, popup.non_editable_popup_opts)
 
   ---Keybinding for focus on text section
   popup.set_popup_keymaps(M.comment_popup, function(text)
-    confirm_create_comment(text, unlinked, opts.discussion_id)
+    M.confirm_create_comment(text, unlinked, opts.discussion_id)
     vim.api.nvim_set_current_win(current_win)
   end, miscellaneous.attach_file, popup.editable_popup_opts)
 
@@ -295,6 +302,33 @@ M.create_comment_suggestion = function()
   end)
 end
 
+--- This function will create a new tab with a suggestion preview for the changed/updated line in
+--- the current MR.
+M.create_comment_with_suggestion = function()
+  M.location = Location.new()
+  if not M.can_create_comment(true) then
+    u.press_escape()
+    return
+  end
+
+  local old_file_name = M.location.reviewer_data.old_file_name ~= "" and M.location.reviewer_data.old_file_name
+    or M.location.reviewer_data.file_name
+  local is_new_sha = M.location.reviewer_data.new_sha_focused
+
+  ---@type ShowPreviewOpts
+  local opts = {
+    old_file_name = old_file_name,
+    new_file_name = M.location.reviewer_data.file_name,
+    start_line = M.location.visual_range.start_line,
+    end_line = M.location.visual_range.end_line,
+    is_new_sha = is_new_sha,
+    revision = is_new_sha and "HEAD" or require("gitlab.state").INFO.target_branch,
+    note_header = "comment",
+    comment_type = "new",
+  }
+  require("gitlab.actions.suggestions").show_preview(opts)
+end
+
 ---Returns true if it's possible to create an Inline Comment
 ---@param must_be_visual boolean True if current mode must be visual
 ---@return boolean

lua/gitlab/actions/common.lua

@@ -174,11 +174,32 @@ M.get_note_node = function(tree, node)
   end
 end
 
+---Gather all lines from immediate children that aren't note nodes
+---@param tree NuiTree
+---@return string[] List of individual note lines
+M.get_note_lines = function(tree)
+  local current_node = tree:get_node()
+  local note_node = M.get_note_node(tree, current_node)
+  if note_node == nil then
+    u.notify("Could not get note node", vim.log.levels.ERROR)
+    return {}
+  end
+  local lines = List.new(note_node:get_child_ids()):reduce(function(agg, child_id)
+    local child_node = tree:get_node(child_id)
+    if child_node ~= nil and not child_node:has_children() then
+      local line = tree:get_node(child_id).text
+      table.insert(agg, line)
+    end
+    return agg
+  end, {})
+  return lines
+end
+
 ---Takes a node and returns the line where the note is positioned in the new SHA. If
 ---the line is not in the new SHA, returns nil
 ---@param node NuiTree.Node
 ---@return number|nil
-local function get_new_line(node)
+M.get_new_line = function(node)
   ---@type GitlabLineRange|nil
   local range = node.range
   if range == nil then
@@ -254,17 +275,19 @@ end
 ---@param root_node NuiTree.Node
 ---@return integer|nil line_number
 ---@return boolean is_new_sha True if line number refers to NEW SHA
+---@return integer|nil end_line
 M.get_line_number_from_node = function(root_node)
   if root_node.range then
-    local line_number, _, is_new_sha = M.get_line_numbers_for_range(
+    local line_number, end_line, is_new_sha = M.get_line_numbers_for_range(
       root_node.old_line,
       root_node.new_line,
       root_node.range.start.line_code,
       root_node.range["end"].line_code
     )
-    return line_number, is_new_sha
+    return line_number, is_new_sha, end_line
   else
-    return M.get_line_number(root_node.id)
+    local start_line, is_new_sha = M.get_line_number(root_node.id)
+    return start_line, is_new_sha, start_line
   end
 end
 
@@ -304,7 +327,7 @@ M.jump_to_file = function(tree)
     return
   end
   vim.cmd.tabnew()
-  local line_number = get_new_line(root_node) or get_old_line(root_node)
+  local line_number = M.get_new_line(root_node) or get_old_line(root_node)
   if line_number == nil or line_number == 0 then
     line_number = 1
   end
@@ -320,4 +343,31 @@ M.jump_to_file = function(tree)
   vim.api.nvim_win_set_cursor(0, { line_number, 0 })
 end
 
+---Determine whether commented line has changed since making the comment.
+---@param tree NuiTree The current discussion tree instance.
+---@param note_node NuiTree.Node The main node of the note containing the note author etc.
+---@return boolean line_changed True if any of the notes in the thread is a system note starting with "changed this line".
+M.commented_line_has_changed = function(tree, note_node)
+  local line_changed = List.new(note_node:get_child_ids()):includes(function(child_id)
+    local child_node = tree:get_node(child_id)
+    if child_node == nil then
+      return false
+    end
+
+    -- Inspect note bodies or recourse to child notes.
+    if child_node.type == "note_body" then
+      local line = tree:get_node(child_id).text
+      if string.match(line, "^changed this line") and note_node.system then
+        return true
+      end
+    elseif child_node.type == "note" and M.commented_line_has_changed(tree, child_node) then
+      return true
+    end
+
+    return false
+  end)
+
+  return line_changed
+end
+
 return M

lua/gitlab/actions/discussions/init.lua

@@ -11,7 +11,6 @@ local popup = require("gitlab.popup")
 local state = require("gitlab.state")
 local reviewer = require("gitlab.reviewer")
 local common = require("gitlab.actions.common")
-local List = require("gitlab.utils.list")
 local tree_utils = require("gitlab.actions.discussions.tree")
 local discussions_tree = require("gitlab.actions.discussions.tree")
 local draft_notes = require("gitlab.actions.draft_notes")
@@ -240,12 +239,84 @@ M.reply = function(tree)
     discussion_id = discussion_id,
     unlinked = unlinked,
     reply = true,
+    -- TODO: use discussion_node.old_file_name for comments on unchanged lines in renamed files
     file_name = discussion_node.file_name,
   })
 
   layout:mount()
 end
 
+---Open a new tab with a suggestion preview.
+---@param tree NuiTree The current discussion tree instance.
+---@param action "reply"|"edit"|"apply" Reply to the current thread, edit the current comment or apply the suggestion to local file.
+M.suggestion_preview = function(tree, action)
+  local is_draft = M.is_draft_note(tree)
+  if action == "reply" and is_draft then
+    u.notify("Gitlab does not support replying to draft notes", vim.log.levels.WARN)
+    return
+  end
+
+  local current_node = tree:get_node()
+  local root_node = common.get_root_node(tree, current_node)
+  local note_node = common.get_note_node(tree, current_node)
+
+  -- Return early if note info is missing
+  if root_node == nil or note_node == nil then
+    u.notify("Couldn't get root node or note node", vim.log.levels.ERROR)
+    return
+  end
+  local note_node_id = tonumber(note_node.is_root and note_node.root_note_id or note_node.id)
+  if note_node_id == nil then
+    u.notify("Couldn't get comment id", vim.log.levels.ERROR)
+    return
+  end
+
+  -- Return early if comment position is missing
+  local start_line, is_new_sha, end_line = common.get_line_number_from_node(root_node)
+  if start_line == nil or end_line == nil then
+    u.notify("Couldn't get comment range. Can't create suggestion preview", vim.log.levels.ERROR)
+    return
+  end
+
+  -- Override reviewer values when local-applying a suggestion that was made on the OLD version
+  if action == "apply" and not is_new_sha then
+    local range = end_line - start_line
+    start_line = common.get_new_line(root_node)
+
+    if start_line == nil then
+      u.notify("Couldn't get position in new version. Can't create suggestion preview", vim.log.levels.ERROR)
+      return
+    end
+
+    end_line = start_line + range
+    is_new_sha = true
+  end
+
+  -- Get values for preview depending on whether comment is on OLD or NEW version
+  local revision
+  if is_new_sha then
+    revision = common.commented_line_has_changed(tree, root_node) and root_node.head_sha or "HEAD"
+  else
+    revision = root_node.base_sha
+  end
+
+  ---@type ShowPreviewOpts
+  local opts = {
+    old_file_name = root_node.old_file_name,
+    new_file_name = root_node.file_name,
+    start_line = start_line,
+    end_line = end_line,
+    is_new_sha = is_new_sha,
+    revision = revision,
+    note_header = note_node.text,
+    comment_type = is_draft and "draft" or action,
+    note_lines = action ~= "reply" and common.get_note_lines(tree) or nil,
+    root_node_id = root_node.id,
+    note_node_id = note_node_id,
+  }
+  require("gitlab.actions.suggestions").show_preview(opts)
+end
+
 -- This function (settings.keymaps.discussion_tree.delete_comment) will trigger a popup prompting you to delete the current comment
 M.delete_comment = function(tree, unlinked)
   vim.ui.select({ "Confirm", "Cancel" }, {
@@ -289,15 +360,7 @@ M.edit_comment = function(tree, unlinked)
 
   edit_popup:mount()
 
-  -- Gather all lines from immediate children that aren't note nodes
-  local lines = List.new(note_node:get_child_ids()):reduce(function(agg, child_id)
-    local child_node = tree:get_node(child_id)
-    if not child_node:has_children() then
-      local line = tree:get_node(child_id).text
-      table.insert(agg, line)
-    end
-    return agg
-  end, {})
+  local lines = common.get_note_lines(tree)
 
   local currentBuffer = vim.api.nvim_get_current_buf()
   vim.api.nvim_buf_set_lines(currentBuffer, 0, -1, false, lines)
@@ -593,6 +656,34 @@ M.set_tree_keymaps = function(tree, bufnr, unlinked)
         nowait = keymaps.discussion_tree.toggle_tree_type_nowait,
       })
     end
+
+    if keymaps.discussion_tree.edit_suggestion then
+      vim.keymap.set("n", keymaps.discussion_tree.edit_suggestion, function()
+        if M.is_current_node_note(tree) then
+          M.suggestion_preview(tree, "edit")
+        end
+      end, { buffer = bufnr, desc = "Edit suggestion", nowait = keymaps.discussion_tree.edit_suggestion_nowait })
+    end
+
+    if keymaps.discussion_tree.apply_suggestion then
+      vim.keymap.set("n", keymaps.discussion_tree.apply_suggestion, function()
+        if M.is_current_node_note(tree) then
+          M.suggestion_preview(tree, "apply")
+        end
+      end, { buffer = bufnr, desc = "Apply suggestion", nowait = keymaps.discussion_tree.apply_suggestion_nowait })
+    end
+
+    if keymaps.discussion_tree.reply_with_suggestion then
+      vim.keymap.set("n", keymaps.discussion_tree.reply_with_suggestion, function()
+        if M.is_current_node_note(tree) then
+          M.suggestion_preview(tree, "reply")
+        end
+      end, {
+        buffer = bufnr,
+        desc = "Reply with suggestion",
+        nowait = keymaps.discussion_tree.reply_with_suggestion_nowait,
+      })
+    end
   end
 
   if keymaps.discussion_tree.refresh_data then
@@ -805,6 +896,10 @@ end
 ---Toggle between draft mode (comments posted as drafts) and live mode (comments are posted immediately)
 M.toggle_draft_mode = function()
   state.settings.discussion_tree.draft_mode = not state.settings.discussion_tree.draft_mode
+  vim.api.nvim_exec_autocmds("User", {
+    pattern = "GitlabDraftModeToggled",
+    data = { draft_mode = state.settings.discussion_tree.draft_mode },
+  })
 end
 
 ---Toggle between sorting by "original comment" (oldest at the top) or "latest reply" (newest at the