don't markdownlint ignored files

I like to put a bunch of untracked stuff in a /scratch directory for
each project, and then puth /scratch in my global gitignore. There are
usually some markdown notes files in here that I don't care about style
for. The previous markdownlint invokation didn't respect the global
gitignore, making local 'engage' runs kinda useless due to false
positives from the scratch dir.

engage.toml

@@ -48,7 +48,11 @@ script = "lychee --offline ."
 [[task]]
 name = "markdownlint"
 group = "lints"
-script = "markdownlint ."
+# don't just use 'markdownlint .' because it will lint files that are ignored by
+# git
+script = """
+git ls-files --cached --others --exclude-standard '*.md' | xargs markdownlint
+"""
 
 [[task]]
 name = "cargo-fmt"

nix/shell.nix

@@ -2,6 +2,7 @@
 { cargo-insta
 , default
 , engage
+, findutils
 , inputs
 , jq
 , lychee
@@ -32,6 +33,7 @@ mkShell {
     # Keep sorted
     cargo-insta
     engage
+    findutils
     jq
     lychee
     markdownlint-cli