fix (cli): Improve ./enola dev script launch performance further

enola

@@ -27,14 +27,30 @@ ROOT="$(realpath "$(dirname "$0")")"
 cd "$ROOT"
 LOG=$(mktemp)
 
-# TODO Skip if not required, to optimize; see https://github.com/enola-dev/enola/issues/753
-tools/distro/build-execjar.bash >"$LOG" 2>&1
-exit_code="$?"
-if [[ "$exit_code" == "0" ]]; then
+if [ -x "$(command -v hashdir)" ]; then
+  mkdir -p "$ROOT"/.cache
+  mv "$ROOT"/.cache/java.hash "$ROOT"/.cache/java.hash.previous 2>/dev/null || true
+  hashdir --quiet java/ > "$ROOT"/.cache/java.hash
+  set +e
+  diff "$ROOT"/.cache/java.hash "$ROOT"/.cache/java.hash.previous 2>/dev/null
+  DIFF="$?"
+  set -e
+else
+  DIFF=3
+fi
+
+if [ "$DIFF" -ne 0 ]; then
+  tools/distro/build-execjar.bash >"$LOG" 2>&1
+  exit_code="$?"
   rm "$LOG"
+else
+  exit_code=0
+fi
+
+if [[ "$exit_code" == "0" ]]; then
   source "$ROOT"/tools/bazel-java-tool-chain/bazel-java-tool-chain.bash
   JAVA=$(java_home)
-  PATH="$JAVA"/bin:"$PATH" site/download/latest/enola
+  PATH="$JAVA"/bin:"$PATH" site/download/latest/enola "$@"
 
 else
   cat "$LOG" && echo >&2 && echo >&2

requirements.txt

@@ -1,6 +1,12 @@
 # PLEASE only use fixed (package)==(version)
 
+# https://pre-commit.com
 pre-commit==3.7.1
+
+# https://github.com/fcivaner/hashdir
+hashdir==0.24
+
+# MkDocs
 mkdocs-material==9.5.25
 mkdocs-git-committers-plugin-2==2.3.0
 mkdocs-git-revision-date-localized-plugin==1.2.6