feat: add api-linter

https://github.com/googleapis/api-linter

lua/lint/linters/api-linter.lua

@@ -0,0 +1,77 @@
+local descriptor_filepath = os.tmpname()
+local cleanup_descriptor = function()
+  os.remove(descriptor_filepath)
+end
+
+--- Function to set the `--descriptor-set-in` argument.
+--- This requires the buf CLI, which will first build the descriptor file.
+local function descriptor_set_in()
+  if vim.fn.executable("buf") == 0 then
+    error("buf CLI not found")
+  end
+
+  -- search for the buf config, searching upwards from the current buffer's directory until $HOME.
+  local buffer_parent_dir = vim.fn.expand("%:p:h") -- the path to the folder of the opened .proto file.
+  local buf_config_filepaths = vim.fs.find(
+    { "buf.yaml", "buf.yml" },
+    { path = buffer_parent_dir, upward = true, stop = vim.fn.expand("$HOME"), type = "file", limit = 1 }
+  )
+  if #buf_config_filepaths == 0 then
+    error("Buf config file not found")
+  end
+
+  -- build the descriptor file.
+  local buf_config_filepath = buf_config_filepaths[1]
+  local buf_config_folderpath = vim.fn.fnamemodify(buf_config_filepath, ":h")
+  local buf_cmd = { "buf", "build", "-o", descriptor_filepath }
+  local buf_cmd_opts = { cwd = buf_config_folderpath }
+  local obj = vim.system(buf_cmd, buf_cmd_opts):wait()
+  if obj.code ~= 0 then
+    error("Command failed: " .. vim.inspect(buf_cmd) .. "\n" .. obj.stderr)
+  end
+
+  -- return the argument to be passed to the linter.
+  return "--descriptor-set-in=" .. descriptor_filepath
+end
+
+return {
+  cmd = "api-linter",
+  stdin = false,
+  append_fname = true,
+  args = {
+    "--output-format=json",
+    "--disable-rule=core::0191::java-multiple-files",
+    "--disable-rule=core::0191::java-package",
+    "--disable-rule=core::0191::java-outer-classname",
+    descriptor_set_in,
+  },
+  stream = "stdout",
+  ignore_exitcode = true,
+  env = nil,
+  parser = function(output)
+    if output == "" then
+      return {}
+    end
+    local json_output = vim.json.decode(output)
+    local diagnostics = {}
+    if json_output == nil then
+      return diagnostics
+    end
+    for _, item in ipairs(json_output) do
+      for _, problem in ipairs(item.problems) do
+        table.insert(diagnostics, {
+          message = problem.message,
+          file = item.file,
+          code = problem.rule_id .. " " .. problem.rule_doc_uri,
+          severity = vim.diagnostic.severity.WARN,
+          lnum = problem.location.start_position.line_number - 1,
+          col = problem.location.start_position.column_number - 1,
+          end_lnum = problem.location.end_position.line_number - 1,
+          end_col = problem.location.end_position.column_number - 1,
+        })
+      end
+    end
+    cleanup_descriptor()
+    return diagnostics
+  end,
+}