Update .lintr

Author: seninp

.lintr

@@ -1,5 +1,26 @@
-linters: with_defaults(
-    "single_quotes_linter" = NULL,
-    "camel_case_linter" = NULL,
-    "line_length_linter" = line_length_linter(100)
-  )
+linters: lintr::linters_with_defaults(
+  line_length_linter        = lintr::line_length_linter(80),
+  object_name_linter        = lintr::object_name_linter(styles = "snake_case"),
+  assignment_linter         = lintr::assignment_linter(),     # prefer '<-'
+  commas_linter             = lintr::commas_linter(),
+  infix_spaces_linter       = lintr::infix_spaces_linter(),
+  trailing_blank_lines_linter = lintr::trailing_blank_lines_linter(),
+  trailing_whitespace_linter  = lintr::trailing_whitespace_linter(),
+  no_tab_linter             = lintr::no_tab_linter(),
+  semicolon_terminator_linter = lintr::semicolon_terminator_linter(),
+  spaces_inside_linter      = lintr::spaces_inside_linter(),
+  # Often noisy/slow across packages; enable if you want stricter checks:
+  object_usage_linter       = NULL
+)
+
+# make the CI job fail when there are lints
+error_on_lint: true
+
+# exclude typical generated/third-party spots
+exclusions:
+  - "inst/doc/**"
+  - "data-raw/**"
+  - "packrat/**"
+  - "renv/**"
+  - "docs/**"
+  - "vignettes/**"   # if you prefer to lint these, remove this line