Add lint_package support to lintr

test/command_callback/test_lintr_command_callback.vader

@@ -34,3 +34,15 @@ Execute(The lintr options should be configurable):
       \   .            'with_defaults(object_usage_linter = NULL))')
   \   . ' %t',
   \ ale_linters#r#lintr#GetCommand(bufnr(''))
+
+Execute(If the lint_package flag is set, lintr::lint_package should be called):
+  let b:ale_r_lintr_lint_package = 1
+
+  AssertEqual
+  \   'cd ' . ale#Escape(getcwd()) . ' && '
+  \   . 'Rscript -e '
+  \   . ale#Escape('suppressPackageStartupMessages(library(lintr));'
+      \    .           'lint_package(cache = FALSE, commandArgs(TRUE),'
+      \    .           'with_defaults())')
+  \   . ' %t',
+  \ ale_linters#r#lintr#GetCommand(bufnr(''))