Comments on deleted lines

lua/gitlab/comment.lua

@@ -19,11 +19,43 @@ M.create_comment         = function()
   keymaps.set_popup_keymaps(commentPopup, M.confirm_create_comment)
 end
 
+M.find_deletion_commit   = function(file)
+  local current_line = vim.api.nvim_get_current_line()
+  local command = string.format("git log -S '%s' %s", current_line, file)
+  local handle = io.popen(command)
+  local output = handle:read("*line")
+  if output == nil then
+    notify("Error reading SHA of deletion commit", "error")
+    return ""
+  end
+  handle:close()
+  local words = {}
+  for word in output:gmatch("%S+") do
+    table.insert(words, word)
+  end
+
+  return words[2]
+end
+
 -- Sends the comment to Gitlab
 M.confirm_create_comment = function(text)
   if u.base_invalid() then return end
   local relative_file_path = u.get_relative_file_path()
   local current_line_number = u.get_current_line_number()
+  if relative_file_path == nil then return end
+
+  -- If leaving a comment on a deleted line, get hash value + proper filename
+  local sha = ""
+  local is_base_file = relative_file_path:find(".git")
+  if is_base_file then -- We are looking at a deletion.
+    local _, path = u.split_diff_view_filename(relative_file_path)
+    sha = M.find_deletion_commit(path)
+    if sha == "" then
+      return
+    end
+  end
+
+
   Job:new({
     command = state.BIN,
     args = {
@@ -32,6 +64,7 @@ M.confirm_create_comment = function(text)
       current_line_number,
       relative_file_path,
       text,
+      sha
     },
     -- TODO: Render the tree after comment creation. Refresh?
     on_stdout = u.print_success,

lua/gitlab/utils/init.lua

@@ -215,6 +215,16 @@ local read_file = function(file_path)
   return file_contents
 end
 
+local split_diff_view_filename = function(filename)
+  local hash, path = filename:match("://%.git/(/?[0-9a-f]+)(/.*)$")
+  if hash and path then
+    path = path:gsub("%.git/", ""):gsub("^/", "")
+    hash = hash:gsub("^/", "")
+  end
+  return hash, path
+end
+
+
 M.get_relative_file_path = get_relative_file_path
 M.get_current_line_number = get_current_line_number
 M.get_buffer_text = get_buffer_text
@@ -233,5 +243,6 @@ M.print_error = print_error
 M.create_popup_state = create_popup_state
 M.exit = exit
 M.read_file = read_file
+M.split_diff_view_filename = split_diff_view_filename
 M.P = P
 return M