[ci] make readme generation a just command

.github/workflows/ci.yml

@@ -32,8 +32,8 @@ jobs:
         uses: taiki-e/install-action@8484225d9734e230a8bf38421a4ffec1cc249372 # v2
         with:
           tool: cargo-readme
-      - name: Run cargo readme
-        run: ./scripts/regenerate-readmes.sh
+      - name: Generate readmes
+        run: just generate-readmes
       - name: Check for differences
         run: git diff --exit-code
       # cargo hack might cause changes to Cargo.lock which can cause the git diff above to fail. Put

Justfile

@@ -24,3 +24,16 @@ rustdoc:
         | gawk '{ gsub(" v", "@", $0); printf("%s\n", $1); }' \
         | xargs printf -- '-p %s\n' \
         | RUSTC_BOOTSTRAP=1 RUSTDOCFLAGS='--cfg=doc_cfg' xargs cargo doc --no-deps --lib --all-features
+
+# Generate README.md files from README.tpl and lib.rs files
+generate-readmes:
+    #!/usr/bin/env bash
+    set -eo pipefail
+
+    git ls-files | grep README.tpl$ | while read -r readme; do
+        echo "Generating README for $readme"
+        dir=$(dirname "$readme")
+        cargo readme --project-root "$dir" > "$dir/README.md.tmp"
+        gawk -f "scripts/fix-readmes.awk" "$dir/README.md.tmp" > "$dir/README.md"
+        rm "$dir/README.md.tmp"
+    done